CP2200/CP2201 Single-Chip Ethernet Controller

CP2200/1
SINGLE-CHIP ETHERNET CONTROLLER
Ethernet Controller
Software Support
Integrated IEEE 802.3 MAC and 10 BASE-T PHY
Fully compatible with 100/1000 BASE-T networks
Full/Half duplex with auto-negotiation
Automatic polarity detection and correction
Automatic retransmission on collision
Automatic padding and CRC generation
Supports broadcast and multi-cast MAC addressing
Royalty-free TCP/IP stack with device drivers
TCP/IP Stack Configuration Wizard
Hardware diagnostic software and example code
Example Applications
Remote sensing and monitoring
Inventory management
VoIP phone adapters
Point-of-sale devices
Network clocks
Embedded Web Server
Remote Ethernet-to-UART bridge
Parallel Host Interface (30 Mbps Transfer Rate)
8-bit multiplexed or non-multiplexed mode
Only 11 I/O pins required in multiplexed mode
Intel® or Motorola® Bus Format
Interrupt on received packets and Wake-on-LAN
Supply Voltage
3.1 to 3.6 V
8 kB Flash Memory
8192 bytes ISP non-volatile memory
Factory pre-programmed unique 48-bit MAC Address
No external EEPROM required
Other Features
Package
Pb-free 48-pin TQFP (9x9 mm footprint)
Pb-free 28-pin QFN (5x5 mm footprint)
Ordering Part Number
LED output drivers (Link/Activity)
Dedicated 2 kB RAM transmit buffer and 4 kB RAM
receive FIFO buffer
Power-on Reset
5 V Tolerant I/O
CP2200-GQ (48-pin)
CP2201-GM (28-pin)
Temperature Range: –40 to +85 °C
20 MHz
XTAL
CP2200
Parallel Bus
8 kB
Flash
Host
Interface
Clock
LED
Control
ACT
LED
2 kB
Tx Buffer
TX+/TX-
Ethernet
MAC
Ethernet
PHY
4 kB
Rx FIFO
RJ-45
RX+/RXLINK
LED
Figure 1. Example System Diagram
Rev. 1.0 5/07
Copyright © 2007 by Silicon Laboratories
CP2200/1
CP2200/1
2
Rev. 1.0
CP2200/1
TABLE OF CONTENTS
Section
Page
1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2. Typical Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4. Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
5. Pinout and Package Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2. Reset Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
6.3. Interrupt Request Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4. Clocking Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.5. LED Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.6. Sending and Receiving Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7. Internal Memory and Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.1. Random Access to RAM Transmit and Receive Buffers . . . . . . . . . . . . . . . . . . . . . . 23
7.2. Internal Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8. Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
9. Reset Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.1. Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
9.2. Power-fail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.3. Oscillator-Fail Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.4. External Pin Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.5. Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.6. Determining the Source of the Last Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.7. De-Selecting Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10. Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
10.1. Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.2. Link Detection Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.3. Memory Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.4. Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
10.5. Disabling Secondary Device Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
11. Transmit Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.2. Transmitting a Packet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.3. Overriding Transmit Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.4. Transmit Buffer and AutoWrite Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.5. Transmit Status and Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
12. Receive Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12.2. Reading a Packet Using the Autoread Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12.3. Timing and Buffer Overflow Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12.4. Initializing the Receive Buffer, Filter and Hash Table . . . . . . . . . . . . . . . . . . . . . . . 59
Rev. 1.0
3
CP2200/1
12.5. Receive Status and Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
12.6. Advanced Receive Buffer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
12.7. Receive Buffer Advanced Status and Control Registers . . . . . . . . . . . . . . . . . . . . .67
13. Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.1. Programming the Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.2. Reading the Flash Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
13.3. Flash Access Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
14. Media Access Controller (MAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
14.1. Initializing the MAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
14.2. Accessing the Indirect MAC Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
14.3. Indirect MAC Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
15. Physical Layer (PHY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
15.1. Auto-Negotiation and Duplex Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
15.2. Auto-Negotiation Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
15.3. Loopback Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
15.4. Link Integrity Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
15.5. Receiver Smart Squelch and Automatic Polarity Correction . . . . . . . . . . . . . . . . . . 89
15.6. Transmitter Jabber Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
15.7. Initializing the Physical Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
16. Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
16.1. Non-Multiplexed Intel Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
16.2. Multiplexed Intel Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
16.3. Non-Multiplexed Motorola Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
16.4. Multiplexed Motorola Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
4
Rev. 1.0
CP2200/1
1. System Overview
The CP2200/1 is a single-chip Ethernet controller containing an integrated IEEE 802.3 Ethernet Media Access
Controller (MAC), 10BASE-T Physical Layer (PHY), and 8 kB Non-Volatile Flash Memory available in a compact
5 x 5 mm QFN-28 package (sometimes called “MLF” or “MLP”) and a 48-pin TQFP package. The CP2200/1 can
add Ethernet connectivity to any microcontroller or host processor with 11 or more Port I/O pins. The 8-bit parallel
interface bus supports both Intel and Motorola bus formats in multiplexed and non-multiplexed mode. The data
transfer rate in non-multiplexed mode can exceed 30 Mbps.
The on-chip Flash memory may be used to store user constants, web server content, or as general purpose nonvolatile memory. The Flash is factory preprogrammed with a unique 48-bit MAC address stored in the last six
memory locations. Having a unique MAC address stored in the CP2200/1 often removes the serialization step from
the product manufacturing process of most embedded systems.
The CP2200/1 has four power modes with varying levels of functionality that allow the host processor to manage
the overall system power consumption. The optional interrupt pin also allows the host to enter a “sleep” mode and
awaken when a packet is received or when the CP2200/1 is plugged into a network. Auto-negotiation allows the
device to automatically detect the most efficient duplex mode (half/full duplex) supported by the network.
The Ethernet Development Kit (Ethernet-DK) bundles a C8051F120 MCU Target Board, CP2200 Ethernet
Development Board (AB4), the Silicon Laboratories IDE, all necessary debug hardware, and a TCP/IP
Configuration Wizard. The Ethernet Development Kit includes all hardware, software, and examples necessary to
design an embedded system using the CP2200. The CP2200 Ethernet Development Board is also compatible with
the C8051F020TB and C8051F340TB. Individual target boards may be purchased online by visiting
www.silabs.com.
Rev. 1.0
5
CP2200/1
2. Typical Connection Diagram
Figure 2 and Figure 3 show typical connection diagrams for the 48-pin CP2200 and 28-pin CP2201.
+3VD
0.1 uF
0.1 uF
0.1 uF
10 uF
10 MΩ
20 MHz
22 pF
22 pF
XTAL1
AV+
VDD1
VDD2
+3VD
4.7 kΩ
RST
MUXEN
XTAL2
MOTEN
Integrated RJ-45 Jack
CP2200
MCU
A15
Optional
LINK
ACT
ACT
LINK
CS
A[7:0]
8
A[7:0]
D[7:0]
8
D[7:0]
8Ω
TX+
TXP
RD
RD
0.001 uF
WR
WR
0.001 uF
1:2.5
RJ-45
TX–
1
TXN
TCT
8Ω
2
3
4
0.1 uF
INT
Optional
RX+
100 Ω
RX–
DGND1
RXP
1:1
6
7
8
RXN
RCT
DGND2
GND
5
INT
0.1 uF
AGND
Chassis
Ground
Note: The CP220x should be placed within 1 inch of the transformer for optimal performance.
Figure 2. Typical Connection Diagram (Non-Multiplexed)
6
Rev. 1.0
CP2200/1
+3VD
0.1 uF
0.1 uF
0.1 uF
10 uF
10 MΩ
20 MHz
22 pF
22 pF
XTAL1
AV+
VDD1
VDD2
+3VD
4.7 kΩ
RST
XTAL2
MOTEN
CS
MCU
AD[7:0]
8
RD
WR
WR
INT
LINK/ACTIVITY
Integrated RJ-45 Jack
TX+
8Ω
TXP
RJ-45
0.001 uF
TX–
1
TXN
TCT
8Ω
2
3
4
0.1 uF
INT
RX+
DGND1
5
100 Ω
RX–
RXP
1:1
6
7
8
RXN
DGND2
GND
1:2.5
0.001 uF
ALE
Optional
LA
AD[7:0]
RD
ALE
CP2201
RCT
AGND
0.1 uF
Chassis
Ground
Note: The CP220x should be placed within 1 inch of the transformer for optimal performance.
Figure 3. Typical Connection Diagram (Multiplexed)
Rev. 1.0
7
CP2200/1
3. Absolute Maximum Ratings
Table 1. Absolute Maximum Ratings
Parameter
Conditions
Min
Typ
Max
Units
Ambient temperature under bias
–55
—
125
°C
Storage Temperature
–65
—
150
°C
Voltage on any I/O Pin or RST with respect to GND
–0.3
—
5.8
V
Voltage on VDD with respect to GND
–0.3
—
4.2
V
Maximum Total current through VDD and GND
—
—
500
mA
Maximum output current sunk by RST or any I/O pin
—
—
100
mA
Note: Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional
operation of the devices at or exceeding the conditions in the operation listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods may affect device reliability.
8
Rev. 1.0
CP2200/1
4. Electrical Characteristics
Table 2. Global DC Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameter
Conditions
Supply Voltage
Min
Typ
Max
Units
3.1
3.3
3.6
V
Supply Current in Normal Mode (Transmitting)
VDD = 3.3 V
—
75
155
mA
Supply Current in Normal Mode (No Network
Traffic)
VDD = 3.3 V
—
60
—
mA
Supply Current with Transmitter and Receiver
Disabled (Memory Mode)
VDD = 3.3 V
—
47
—
mA
Supply Current in Reset
VDD = 3.3 V
—
15
—
mA
Supply Current in Shutdown Mode
VDD = 3.3 V
—
6.5
—
mA
–40
—
+85
°C
Specified Operating Temperature Range
Table 3. Digital I/O DC Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
Conditions
Min
Typ
Max
UNITS
Output High Voltage (VOH)
IOH = –3 mA
IOH = –10 µA
IOH = –10 mA
VDD – 0.7
VDD – 0.1
—
—
—
VDD – 0.8
—
—
—
V
Output Low Voltage (VOL)
IOL = 8.5 mA
IOL = 10 µA
IOL = 25 mA
—
—
—
—
—
1.0
0.6
0.1
—
V
Input High Voltage (VIH)
2.0
—
—
V
Input Low Voltage (VIL)
—
—
0.8
V
Input Leakage Current
—
25
50
µA
Rev. 1.0
9
CP2200/1
5. Pinout and Package Definitions
Table 4. CP2200/1 Pin Definitions
Name
Pin Numbers
Type
Description
48-pin
28-pin
AV+
5
3
AGND
4
2
VDD1
13
8
DGND1
14
9
VDD2
30
19
DGND2
31
20
RST
15
10
D I/O
Device Reset. Open-drain output of internal POR and VDD monitor.
An external source can initiate a system reset by driving this pin low
for at least 15 µs.
LINK
3*
—
D Out
Link LED. Push-pull output driven high when valid 10BASE-T link
pulses are detected (Link Good) and driven low when valid
10BASE-T link pulses are not detected (Link Fail).
ACT
2*
—
D Out
Activity LED. Push-pull output driven high for 50 ms when any
packet is transmitted or received and driven low all other times.
LA
—
1*
D Out
Link or Activity LED. Push-pull output driven high when valid link
pulses are detected (Link Good) and driven low otherwise (Link
Fail). The output is toggled for each packet transmitted or received,
then returns to its original state after 50 ms.
XTAL1
46
28
A In
Crystal Input. This pin is the return for the external oscillator driver.
This pin can be overdriven by an external CMOS clock.
XTAL2
45*
27*
A Out
Crystal Output. This pin is the excitation driver for a quartz crystal.
TX+
9
6
A Out
10BASE-T Transmit, Differential Output (Positive).
TX–
10
7
A Out
10BASE-T Transmit, Differential Output (Negative).
RX+
7
5
A In
10BASE-T Receive, Differential Input (Positive).
RX–
6
4
A In
10BASE-T Receive, Differential Input (Negative).
MOTEN
43
26
D In
Motorola Bus Format Enable. This pin should be tied directly to VDD
for Motorola bus format or directly to GND for Intel bus format.
MUXEN
44
—
D In
Multiplexed Bus Enable. This pin should be tied directly to VDD for
multiplexed bus mode or directly to GND for non-multiplexed bus
mode.
INT
42
25
D Out
Power In 3.1–3.6 V Analog Power Supply Voltage Input.
Analog Ground
Power In 3.1–3.6 V Digital Power Supply Voltage Input.
Digital Ground
Power In 3.1–3.6 V Digital Power Supply Voltage Input.
Digital Ground
Interrupt Service Request. This pin provides notification to the host.
*Note: Pins can be left unconnected when not used.
10
Rev. 1.0
CP2200/1
Table 4. CP2200/1 Pin Definitions (Continued)
Name
Pin Numbers
Type
Description
48-pin
28-pin
CS
41
24
D In
Device Chip Select.
RD/(DS)
39
22
D In
Read Strobe (Intel Mode) or
Data Strobe (Motorola Mode)
WR/(R/W)
40
23
D In
Write Strobe (Intel Mode) or
Read/Write Strobe (Motorola Mode)
D0/AD0
16
11
D I/O
Bit 0, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D1/AD1
17
12
D I/O
Bit 1, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D2/AD2
18
13
D I/O
Bit 2, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D3/AD3
19
14
D I/O
Bit 3, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D4/AD4
20
15
D I/O
Bit 4, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D5/AD5
21
16
D I/O
Bit 5, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D6/AD6
22
17
D I/O
Bit 6, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
D7/AD7
23
18
D I/O
Bit 7, Non-Multiplexed Data Bus or Multiplexed Address/Data Bus
A0
27*
—
D In
Bit 0, Non-Multiplexed Address Bus
A1
28*
—
D In
Bit 1, Non-Multiplexed Address Bus
A2
29*
—
D In
Bit 2, Non-Multiplexed Address Bus
A3/ALE/(AS)
32
—
D In
Bit 3, Non-Multiplexed Address Bus
ALE Strobe (Multiplexed Intel Mode)
Address Strobe (Multiplexed Motorola Mode)
ALE/(AS)
—
21
D In
ALE Strobe (Intel Mode)
Address Strobe (Motorola Mode)
A4
33*
—
D In
Bit 4, Parallel Interface Non-Multiplexed Address Bus
A5
34*
—
D In
Bit 5, Parallel Interface Non-Multiplexed Address Bus
A6
37*
—
D In
Bit 6, Parallel Interface Non-Multiplexed Address Bus
A7
38*
—
D In
Bit 7, Parallel Interface Non-Multiplexed Address Bus
NC
1, 8,
11,12
24–26
35,36
47, 48
—
These pins should be left unconnected or tied to VDD.
*Note: Pins can be left unconnected when not used.
Rev. 1.0
11
NC
NC
XTAL1
XTAL2
MUXEN
MOTEN
INT
CS
WR/(R/W)
RD/(DS)
A7
A6
48
47
46
45
44
43
42
41
40
39
38
37
CP2200/1
NC
1
36
NC
ACT
2
35
NC
LINK
3
34
A5
AGND
4
33
A4
AV+
5
32
A3/ALE/(AS)
RX-
6
31
DGND2
RX+
7
30
VDD2
NC
8
29
A2
TX+
9
28
A1
TX-
10
27
A0
NC
11
26
NC
NC
12
25
NC
20
21
22
23
24
D5/AD5
D6/AD6
D7/AD7
NC
18
D2/AD2
D4/AD4
17
D1/AD1
19
16
D0/AD0
D3/AD3
15
14
DGND1
RST
13
VDD1
CP2200
Top View
Figure 4. 48-pin TQFP Pinout Diagram
12
Rev. 1.0
CP2200/1
D
Table 5. TQFP-48 Package
Dimensions
D1
E1
E
A
A1
A2
b
D
D1
E
e
E1
Min
—
0.05
0.95
0.17
—
—
—
—
—
MM
Typ
—
—
1.00
0.22
9.00
7.00
9.00
0.50
7.00
Max
1.20
0.15
1.05
0.27
—
—
—
—
—
48
PIN 1
IDENTIFIER
A2
1
e
A
A1
b
Figure 5. 48-pin TQFP Package Dimensions
Rev. 1.0
13
XTAL1
XTAL2
MOTEN
INT
CS
WR/(R/W)
RD/(DS)
27
26
25
24
23
22
GND
28
CP2200/1
LA
1
21
ALE/(AS)
AGND
2
20
DGND2
AV+
3
19
VDD2
RX-
4
18
AD7
RX+
5
17
AD6
TX+
6
16
AD5
15
AD4
CP2201
Top View
GND
13
14
AD2
AD3
11
AD0
12
10
RST
AD1
9
VDD1
DGND1
7
8
TX-
Figure 6. QFN-28 Pinout Diagram (Top View)
14
Rev. 1.0
CP2200/1
14
13
12
11
10
9
8
Bottom View
L
7
15
16
D2
D2
2
17
e
4
19
E2
2
3
18
R
6xe
E
5
E2
b
6
2
20
21
22
23
24
25
26
27
DETAIL 1
28
1
Table 6. QFN-28 Package
Dimensions
6xe
D
A
A2
Side View
MM
Typ
0.90
0.02
0.65
0.25
0.23
5.00
3.15
5.00
3.15
0.5
0.55
28
7
7
—
0.435
0.435
0.18
0.18
Max
1.00
0.05
1.00
—
0.30
—
3.35
—
3.35
—
0.65
—
—
—
—
—
—
—
—
A1
A3
e
A
A1
A2
A3
b
D
D2
E
E2
e
L
N
ND
NE
R
AA
BB
CC
DD
Min
0.80
0
0
—
0.18
—
2.90
—
2.90
—
0.45
—
—
—
0.09
—
—
—
—
DETAIL 1
CC
DD
BB
AA
Figure 7. QFN-28 Package Drawing
Rev. 1.0
15
CP2200/1
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.50 mm
0.10 mm
0.20 mm
0.20 mm
0.50 mm
Top View
0.20 mm
L
e
E2
0.20 mm
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.10 mm
E
Figure 8. Typical QFN-28 Landing Diagram
16
Rev. 1.0
D
D2
b
Optional
GND
Connection
CP2200/1
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.50 mm
0.60 mm
0.20 mm
0.10 mm
0.20 mm
0.20 mm
0.50 mm
Top View
0.60 mm
0.30 mm
0.70 mm
b
0.20 mm
D
D2
0.40 mm
e
L
E2
0.20 mm
0.30 mm
0.50 mm
0.85 mm
0.35 mm
0.10 mm
E
Figure 9. Typical QFN-28 Solder Paste Diagram
Rev. 1.0
17
CP2200/1
6. Functional Description
6.1. Overview
In most systems, the CP2200/1 is used for transmitting and receiving Ethernet packets, non-volatile data storage,
and controlling Link and Activity LEDs. The device is controlled using direct and indirect internal registers
accessible through the parallel host interface. All digital pins on the device are 5 V tolerant.
6.2. Reset Initialization
After every CP2200/1 reset, the following initialization procedure is recommended to ensure proper device
operation:
Step 1: Wait for the reset pin to rise. This step takes the longest during a power-on reset.
Step 2: Wait for Oscillator Initialization to complete. The host processor will receive notification through the
interrupt request signal once the oscillator has stabilized.
Step 3: Wait for Self Initialization to complete. The INT0 interrupt status register on page 31 should be
checked to determine when Self Initialization completes.
Step 4: Disable interrupts (using INT0EN and INT1EN on page 33 and page 36) for events that will not be
monitored or handled by the host processor. By default, all interrupts are enabled after every reset.
Step 5: Initialize the physical layer. See “15.7. Initializing the Physical Layer” on page 90 for a detailed
physical layer initialization procedure.
Step 6: Enable the desired Activity, Link, or Activity/Link LEDs using the IOPWR register on page 45.
Step 7: Initialize the media access controller (MAC). See “14.1. Initializing the MAC” on page 78 for a
detailed MAC initialization procedure.
Step 8: Configure the receive filter. See “12.4. Initializing the Receive Buffer, Filter and Hash Table” on
page 59 for a detailed initialization procedure.
Step 9: The CP2200/1 is ready to transmit and receive packets.
6.3. Interrupt Request Signal
The CP2200/1 has an interrupt request signal (INT) that can be used to notify the host processor of pending
interrupts. The INT signal is asserted upon detection of any enabled interrupt event. Host processors that cannot
dedicate a port pin to the INT signal can periodically poll the interrupt status registers to see if any interrupt
generating events have occurred. If the /INT signal is not used, pending interrupts such a Receive FIFO Full must
still be serviced.
The 14 interrupt sources are listed below. Interrupts are enabled on reset and can be disabled by software.
Pending interrupts can be cleared (allowing the INT signal to de-assert) by reading the self-clearing interrupt
registers. See “8. Interrupt Sources” on page 30 for a complete description of the CP2200/1 interrupts.
18
End of Packet Reached
Packet Received
Receive FIFO Empty
“Wake-on-LAN” Wakeup Event
Receive FIFO Full
Link Status Changed
Oscillator Initialization Complete
Jabber Detected
Self Initialization Complete
Auto-Negotiation Failed
Flash Write/Erase Complete
Remote Fault Notification
Packet Transmitted
Auto-Negotiation Complete
Rev. 1.0
CP2200/1
6.4. Clocking Options
The CP2200/1 can be clocked from an external parallel-mode crystal oscillator or CMOS clock. Figure 10 and
Figure 11 show typical connections for both clock source types. If a crystal oscillator is chosen to clock the device,
the crystal is started once the device is released from reset and remains on until the device reenters the reset state
or loses power.
XTAL1
20 MHz
10 MΩ
XTAL2
Figure 10. Crystal Oscillator Example
Important note on external crystals: Crystal oscillator circuits are quite sensitive to PCB layout. The crystal
should be placed as close as possible to the XTAL pins on the device. The traces should be as short as possible
and shielded with a ground plane from any other traces that could introduce noise or interference.
20 MHz
CMOS
Clock
XTAL1
XTAL2
No Connect
Figure 11. External CMOS Clock Example
Table 7 lists the clocking requirements of the CP2200/1 when using a crystal oscillator or CMOS clock. Table 8
shows the electrical characteristics of the XTAL1 pin. These characteristics are useful when selecting an external
CMOS clock.
Rev. 1.0
19
CP2200/1
Table 7. Clocking Requirements
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
Conditions
Min
Typ
Max
UNITS
Frequency
—
20
—
MHz
Frequency Error
—
—
±50
ppm
Duty Cycle
45
50
55
%
Min
Typ
Max
UNITS
XTAL1 Input Low Voltage
—
—
0.7
V
XTAL1 Input High Voltage
2.0
—
—
V
Table 8. Input Clock Pin (XTAL1) DC Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
20
Conditions
Rev. 1.0
CP2200/1
6.5. LED Control
The CP2200/1 can be used to control link status and activity LEDs. The CP2200 (48-pin TQFP) has two push-pull
LED drivers that can source up to 10 mA each. The CP2201 (28-pin QFN) has a single push-pull LED driver that
turns the LED on or off based on the link status and blinks the LED when activity is detected on a good link. Table 9
shows the function of the LED signals available on the CP2200/1.
Table 9. LED Control Signals
Signal
Device
Description
LINK
CP2200
Asserted when valid link pulses are detected.
ACT
CP2200
Asserted for 50 ms for each packet transmitted or received.
LA
CP2201
Asserted when valid link pulses are detected and toggled for 50 ms for
each packet transmitted or received.
Figure 12 shows a typical LED connection for the CP2200. The CP2201 uses an identical connection for the LA
(link/activity) pin. The LED drivers are enabled and disabled using the IOPWR register on page 45.
LINK
ACT
Figure 12. LED Control Example (CP2200)
Rev. 1.0
21
CP2200/1
6.6. Sending and Receiving Packets
After reset initialization is complete, the CP2200/1 is ready to send and receive packets. Packets are sent by
loading data into the transmit buffer using the AutoWrite register and writing ‘1’ to TXGO. See “11.2. Transmitting a
Packet” on page 48 for detailed information on how to transmit a packet using the transmit interface. A Packet
Transmitted interrupt will be generated once transmission is complete.
Packet reception occurs automatically when reception is enabled in the MAC and the receive buffer is not full.
Once a packet is received, the host processor is notified by generating a Packet Received interrupt. The host may
read the packet using the AutoRead interface. See “12.2. Reading a Packet Using the Autoread Interface” on
page 58 and “12.4. Initializing the Receive Buffer, Filter and Hash Table” on page 59 for additional information on
using and initializing the receive interface.
22
Rev. 1.0
CP2200/1
7. Internal Memory and Registers
The CP2200/1 is controlled through direct and indirect registers accessible through the parallel host interface. The
host interface provides an 8-bit address space, of which there are 114 valid direct register locations (see Table 11
on page 25). All remaining addresses in the memory space are reserved and should not be read or written. The
direct registers provide access to the RAM buffers, Flash memory, indirect MAC configuration registers, and other
status and control registers for various device functions.
Figure 13 shows the RAM and Flash memory organization. The transmit and receive RAM buffers share the same
address space and are both accessed using the RAMADDRH:RAMADDRL pointer. Each of the buffers has a
dedicated data register. The Flash memory has a separate address space and a dedicated address pointer and
data register. See “13. Flash Memory” on page 73 for detailed information on how to read and write to Flash.
Transmit Buffer (2K)
0x0000 – 0x07FF
Receive Buffer (4K)
0x0000 – 0x0FFF
Flash Memory (8K)
0x0000 – 0x1FFF
RAMADDRH:RAMADDRL
FLASHADDRH:FLASHADDRL
Figure 13. RAM Buffers and Flash Memory Organization
7.1. Random Access to RAM Transmit and Receive Buffers
The most common and most efficient methods for accessing the transmit and receive buffers are the AutoWrite
and AutoRead interfaces. These interfaces allow entire packets to be written or read at a time. In very few cases,
the transmit and receive buffers may need to be accessed randomly. An example of this is a system in which a
specific byte in the packet is checked to determine whether to read the packet or discard it. The following
procedure can be used to read or write data to either RAM buffer:
Step 1: Write the address of the target byte to RAMADDRH:RAMADDRL.
Step 2: Transmit Buffer:
Read or write 8-bit data to RAMTXDATA to read or write from the target byte in the transmit buffer.
Receive Buffer:
Read or write 8-bit data to RAMRXDATA to read or write from the target byte in the receive buffer.
Note: Reads and writes of the RAM buffers using the random access method are independent of the
AutoRead and AutoWrite interfaces. Each of the interfaces has a dedicated set of address and data
registers. See “11.2. Transmitting a Packet” on page 48 and “12.2. Reading a Packet Using the
Autoread Interface” on page 58 for additional information about the AutoRead and AutoWrite
interfaces.
Rev. 1.0
23
CP2200/1
Register 1. RAMADDRH: RAM Address Pointer High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x08
Bits7–0: RAMADDRH: RAM Address Register High Byte
Holds the most significant eight bits of the target RAM address.
Register 2. RAMADDRL: RAM Address Pointer Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x09
Bits7–0: RAMADDRL: RAM Address Register Low Byte
Holds the least significant eight bits of the target RAM address.
Register 3. RAMTXDATA: RAM Transmit Buffer Data Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x04
Bits7–0: RAMTXDATA: Transmit Buffer Data Register
Read: Returns data in the transmit buffer at location RAMADDRH:RAMADDRL.
Write: Writes data to the transmit buffer at location RAMADDRH:RAMADDRL.
Register 4. RAMRXDATA: RAM Receive Buffer Data Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x02
Bits7–0: RAMRXDATA: Receive Buffer Data Register
Read: Returns data in the receive buffer at location RAMADDRH:RAMADDRL.
Write: Writes data to the receive buffer at location RAMADDRH:RAMADDRL.
24
Rev. 1.0
CP2200/1
7.2. Internal Registers
The CP2200/1 has 114 direct internal registers and 9 indirect registers. The registers are grouped into ten
categories based on function. Table 10 lists the register groups and provides links to the detailed register
descriptions for each group. Table 11 lists all direct registers available on the device.
Table 10. CP2200/1 Register Groups
RAM Access Registers
Section 7.1 on page 23
Interrupt Status and Control Registers
Section 8 on page 30
Reset Source Registers
Section 9 on page 37
Power Mode Registers
Section 10 on page 43
Transmit Status and Control Registers
Section 11.5 on page 49
Receive Interface Status and Control Registers
Section 12.5 on page 60
Receive Buffer Status and Control Registers
Section 12.7 on page 67
FLASH Access Registers
Section 13.3 on page 75
MAC Access Registers
Section 14.2 on page 78
MAC Indirect Registers
Section 14.3 on page 80
PHY Status and Control Registers
Section 15 on page 88
Table 11. Direct Registers
Register
Address
Description
Page No.
CPADDRH
0x21
Current RX Packet Address High Byte
page 65
CPADDRL
0x22
Current RX Packet Address Low Byte
page 65
CPINFOH
0x1D
Current RX Packet Information High Byte
page 63
CPINFOL
0x1E
Current RX Packet Information Low Byte
page 64
CPLENH
0x1F
Current RX Packet Length High Byte
page 64
CPLENL
0x20
Current RX Packet Length Low Byte
page 64
CPTLB
0x1A
Current RX Packet TLB Number
page 67
FLASHADDRH
0x69
Flash Address Pointer High Byte
page 76
FLASHADDRL
0x68
Flash Address Pointer Low Byte
page 76
FLASHAUTORD
0x05
Flash AutoRead w/ increment
page 77
FLASHDATA
0x06
Flash Read/Write Data Register
page 77
FLASHERASE
0x6A
Flash Erase
page 77
FLASHKEY
0x67
Flash Lock and Key
page 76
FLASHSTA
0x7B
Flash Status
page 75
Rev. 1.0
25
CP2200/1
Table 11. Direct Registers
26
Register
Address
Description
Page No.
INT0
0x63
Interrupt Status Register 0 (Self-Clearing)
page 31
INT0EN
0x64
Interrupt Enable Register 0
page 33
INT0RD
0x76
Interrupt Status Register 0 (Read-Only)
page 32
INT1
0x7F
Interrupt Status Register 1 (Self-Clearing)
page 34
INT1EN
0x7D
Interrupt Enable Register 1
page 36
INT1RD
0x7E
Interrupt Status Register 1 (Read-Only)
page 35
IOPWR
0x70
Port Input/Output Power
page 45
MACADDR
0x0A
MAC Address Pointer
page 79
MACDATAH
0x0B
MAC Data Register High Byte
page 79
MACDATAL
0x0C
MAC Data Register Low Byte
page 79
MACRW
0x0D
MAC Read/Write Initiate
page 79
OSCPWR
0x7C
Oscillator Power
page 46
PHYCF
0x79
Physical Layer Configuration
page 92
PHYCN
0x78
Physical Layer Control
page 91
PHYSTA
0x80
Physical Layer Status
page 93
RAMADDRH
0x08
RAM Address Pointer High Byte
page 24
RAMADDRL
0x09
RAM Address Pointer Low Byte
page 24
RAMRXDATA
0x02
RXFIFO RAM Data Register
page 24
RAMTXDATA
0x04
TXBUFF RAM Data Register
page 24
RSTEN
0x72
Reset Enable Register
page 42
RSTSTA
0x73
Reset Source Status Register
page 41
RXAUTORD
0x01
RXFIFO AutoRead w/ increment
page 62
RXCN
0x11
Receive Control
page 61
RXFIFOHEADH
0x17
Receive Buffer Head Pointer High Byte
page 71
RXFIFOHEADL
0x18
Receive Buffer Head Pointer Low Byte
page 71
RXFIFOSTA
0x5B
Receive Buffer Status
page 72
RXFIFOTAILH
0x15
Receive Buffer Tail Pointer High Byte
page 71
RXFIFOTAILL
0x16
Receive Buffer Tail Pointer Low Byte
page 71
RXFILT
0x10
Receive Filter Configuration
page 62
Rev. 1.0
CP2200/1
Table 11. Direct Registers
Register
Address
Description
Page No.
RXHASHH
0x0E
Receive Hash Table High Byte
page 62
RXHASHL
0x0F
Receive Hash Table Low Byte
page 63
RXSTA
0x12
Receive Status
page 61
SWRST
0x75
Software Reset Register
page 40
TLB0ADDRH
0x27
TLB0 Address High Byte
page 70
TLB0ADDRL
0x28
TLB0 Address Low Byte
page 70
TLB0INFOH
0x23
TLB0 Information High Byte
page 68
TLB0INFOL
0x24
TLB0 Information Low Byte
page 69
TLB0LENH
0x25
TLB0 Length High Byte
page 69
TLB0LENL
0x26
TLB0 Length Low Byte
page 70
TLB1ADDRH
0x2D
TLB1 Address High Byte
page 70
TLB1ADDRL
0x2E
TLB1 Address Low Byte
page 70
TLB1INFOH
0x29
TLB1 Information High Byte
page 68
TLB1INFOL
0x2A
TLB1 Information Low Byte
page 69
TLB1LENH
0x2b
TLB1 Length High Byte
page 69
TLB1LENL
0x2C
TLB1 Length Low Byte
page 70
TLB2ADDRH
0x33
TLB2 Address High Byte
page 70
TLB2ADDRL
0x34
TLB2 Address Low Byte
page 70
TLB2INFOH
0x2F
TLB2 Information High Byte
page 68
TLB2INFOL
0x30
TLB2 Information Low Byte
page 69
TLB2LENH
0x31
TLB2 Length High Byte
page 69
TLB2LENL
0x32
TLB2 Length Low Byte
page 70
TLB3ADDRH
0x39
TLB3 Address High Byte
page 70
TLB3ADDRL
0x3A
TLB3 Address Low Byte
page 70
TLB3INFOH
0x35
TLB3 Information High Byte
page 68
TLB3INFOL
0x36
TLB3 Information Low Byte
page 69
TLB3LENH
0x37
TLB3 Length High Byte
page 69
TLB3LENL
0x38
TLB3 Length Low Byte
page 70
TLB4ADDRH
0x3F
TLB4 Address High Byte
page 70
Rev. 1.0
27
CP2200/1
Table 11. Direct Registers
28
Register
Address
Description
Page No.
TLB4ADDRL
0x40
TLB4 Address Low Byte
page 70
TLB4INFOH
0x3B
TLB4 Information High Byte
page 68
TLB4INFOL
0x3C
TLB4 Information Low Byte
page 69
TLB4LENH
0x3D
TLB4 Length High Byte
page 69
TLB4LENL
0x3E
TLB4 Length Low Byte
page 70
TLB5ADDRH
0x45
TLB5 Address High Byte
page 70
TLB5ADDRL
0x46
TLB5 Address Low Byte
page 70
TLB5INFOH
0x41
TLB5 Information High Byte
page 68
TLB5INFOL
0x42
TLB5 Information Low Byte
page 69
TLB5LENH
0x43
TLB5 Length High Byte
page 69
TLB5LENL
0x44
TLB5 Length Low Byte
page 70
TLB6ADDRH
0x4B
TLB6 Address High Byte
page 70
TLB6ADDRL
0x4C
TLB6 Address Low Byte
page 70
TLB6INFOH
0x47
TLB6 Information High Byte
page 68
TLB6INFOL
0x48
TLB6 Information Low Byte
page 69
TLB6LENH
0x49
TLB6 Length High Byte
page 69
TLB6LENL
0x4A
TLB6 Length Low Byte
page 70
TLB7ADDRH
0x51
TLB7 Address High Byte
page 70
TLB7ADDRL
0x52
TLB7 Address Low Byte
page 70
TLB7INFOH
0x4D
TLB7 Information High Byte
page 68
TLB7INFOL
0x4E
TLB7 Information Low Byte
page 69
TLB7LENH
0x4F
TLB7 Length High Byte
page 69
TLB7LENL
0x50
TLB7 Length Low Byte
page 70
TLBVALID
0x1C
TLB Valid Indicators
page 68
TXAUTOWR
0x03
Transmit Data AutoWrite
page 53
TXBUSY
0x54
Transmit Busy Indicator
page 51
TXCN
0x53
Transmit Control
page 51
TXENDH
0x57
Transmit Data Ending Address High Byte
page 53
TXENDL
0x58
Transmit Data Ending Address Low Byte
page 53
Rev. 1.0
CP2200/1
Table 11. Direct Registers
Register
Address
Description
Page No.
TXPAUSEH
0x55
Transmit Pause High Byte
page 52
TXPAUSEL
0x56
Transmit Pause Low Byte
page 52
TXPWR
0x7A
Transmitter Power
page 46
TXSTA0
0x62
Transmit Status Vector 0
page 57
TXSTA1
0x61
Transmit Status Vector 1
page 56
TXSTA2
0x60
Transmit Status Vector 2
page 56
TXSTA3
0x5F
Transmit Status Vector 3
page 55
TXSTA4
0x5E
Transmit Status Vector 4
page 55
TXSTA5
0x5D
Transmit Status Vector 5
page 54
TXSTA6
0x5C
Transmit Status Vector 6
page 54
TXSTARTH
0x59
Transmit Data Starting Address High Byte
page 52
TXSTARTL
0x5A
Transmit Data Starting Address Low Byte
page 52
VDMCN
0x13
VDD Monitor Control Register
page 39
Rev. 1.0
29
CP2200/1
8. Interrupt Sources
The CP2200/1 can alert the host processor when any of the 14 interrupt source events listed in Table 12 triggers
an interrupt. The CP2200/1 alerts the host by setting the appropriate flags in the interrupt status registers and
driving the INT pin low. The INT pin will remain asserted until all interrupt flags for enabled interrupts have been
cleared by the host. Interrupt flags are cleared by reading the self-clearing interrupt status registers, INT0 and
INT1. Interrupts can be disabled by clearing the corresponding bits in INT0EN and INT1EN.
If the host processor does not utilize the INT pin, it can periodically read the interrupt status registers to determine
if any interrupt-generating events have occurred. The INT0RD and INT1RD read-only registers provide a method
of checking for interrupts without clearing the interrupt status registers.
Table 12. Interrupt Source Events
Event
Description
Pending
Flag
Enable
Flag
End of Packet
The last byte of a packet has been read from the
receive buffer using the AutoRead interface.
INT0.7
INT0EN.7
Receive FIFO Empty
The last packet in the receive buffer has been unloaded
or discarded.
INT0.6
INT0EN.6
Self Initialization Complete
The device is ready for Reset Initialization. See “6.2.
Reset Initialization” on page 18.
INT0.5
INT0EN.5
Oscillator Initialization Complete The external oscillator has stabilized.
INT0.4
INT0EN.4
Flash Write/Erase Complete
A Flash write or erase operation has completed.
INT0.3
INT0EN.3
Packet Transmitted
The transmit interface has transmitted a packet.
INT0.2
INT0EN.2
Receive FIFO Full
The receive buffer is full or the maximum number of
packets has been exceeded. Decode the RXFIFOSTA
status register to determine the receive buffer status.
INT0.1
INT0EN.1
Packet Received
A packet has been added to the receive buffer.
INT0.0
INT0EN.0
“Wake-on-LAN” Wakeup Event
The device has been connected to a network.
INT1.5
INT1EN.5
Link Status Changed
The device has been connected or disconnected from
the network.
INT1.4
INT1EN.4
Jabber Detected
The transmit interface has detected and responded to a
jabber condition. See IEEE 802.3 for more information
about jabber conditions.
INT1.3
INT1EN.3
Auto-Negotiation Failed
An auto-negotiation attempt has failed. Software should
check for a valid link and re-try auto-negotiation.
INT1.2
INT1EN.2
An auto-negotiation attempt has completed. This interrupt only indicates completion, and not success. Occasionally, Auto-Negotiation attempts will not complete
and/or fail; therefore, a 3 to 4 second timeout should be
implemented. A successful auto-negotiation attempt is
one that completes without failure.
INT1.0
INT1EN.0
Reserved
Auto-Negotiation Complete
30
Rev. 1.0
CP2200/1
Register 5. INT0: Interrupt Status Register 0 (Self-Clearing)
RC
RC
RC
EOPINT
RXEINT
SELFINT
Bit7
Bit6
Bit5
RC
RC
OSCINT FLWEINT
Bit4
RC
RC
RC
Reset Value
TXINT
RXFINT
RXINT
00000000
Bit2
Bit1
Bit0
Address:
Bit3
0x63
Note: Reading this register will clear all INT0 interrupt flags.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
EOPINT: End of Packet Interrupt Flag
0: The last byte of a packet has not been read since the last time EOPINT was cleared.
1: The last byte of a packet has been read.
RXEINT: Receive FIFO Empty Interrupt Flag
0: The receive FIFO has not been empty since the last time RXEINT was cleared.
1: The receive FIFO is empty.
SELFINT: Self Initialization Complete Interrupt Flag
0: Self Initialization has not completed since the last time SELFINT was cleared.
1: Self Initialization has completed.
OSCINT: Oscillator Initialization Complete Interrupt Flag
0: Oscillator Initialization has not completed since the last time OSCINT was cleared.
1: Oscillator Initialization has completed.
FLWEINT: Flash Write/Erase Operation Complete Interrupt Flag
0: A Flash write or erase operation has not completed since the last time FLWEINT was cleared.
1: A Flash write or erase operation has completed.
TXINT: Packet Transmitted Interrupt Flag
0: A packet transmission has not completed since the last time TXINT was cleared.
1: A packet has been transmitted.
RXFINT: Receive FIFO Full Interrupt Flag
0: The receive FIFO has not been full since the last time RXFINT was cleared.
1: The receive FIFO is full.
RXINT: Packet Received Interrupt Flag
0: A packet has not been added to the receive buffer since the last time RXINT was cleared.
1: A packet has been added to the receive buffer.
Rev. 1.0
31
CP2200/1
Register 6. INT0RD: Interrupt Status Register 0 (Read-Only)
R
R
R
R
R
R
EOPINTR RXEINTR SELFINTR OSCINTR FLWEINTR TXINTR
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
R
R
Reset Value
RXFINTR RXINTR 00000000
Bit1
Bit0
Address:
0x76
Note: Reading this register will not clear INT0 interrupt flags.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
32
EOPINTR: End of Packet Read-Only Interrupt Flag
0: The last byte of a packet has not been read since the last time EOPIF was cleared.
1: The last byte of a packet has been read.
RXEINTR: Receive FIFO Empty Read-Only Interrupt Flag
0: The receive FIFO has not been empty since the last time RXFIFOE was cleared.
1: The receive FIFO is empty.
SELFINTR: Self Initialization Complete Read-Only Interrupt Flag
0: Self Initialization has not completed since the last time SELFINT was cleared.
1: Self Initialization has completed.
OSCINTR: Oscillator Initialization Complete Read-Only Interrupt Flag
0: Oscillator Initialization has not completed since the last time OSCINT was cleared.
1: Oscillator Initialization has completed.
FLWEINTR: Flash Write/Erase Operation Complete Read-Only Interrupt Flag
0: A Flash write or erase operation has not completed since the last time FLWEINT was cleared.
1: A Flash write or erase operation has completed.
TXINTR: Packet Transmitted Read-Only Interrupt Flag
0: A packet transmission has not completed since the last time TXINT was cleared.
1: A packet has been transmitted.
RXFINTR: Receive FIFO Full Read-Only Interrupt Flag
0: The receive FIFO has not been full since the last time RXFINT was cleared.
1: The receive FIFO is full.
RXINTR: Packet Received Read-Only Interrupt Flag
0: A packet has not been added to the receive buffer since the last time RXINT was cleared.
1: A packet has been added to the receive buffer.
Rev. 1.0
CP2200/1
Register 7. INT0EN: Interrupt Enable Register 0
R/W
R/W
R/W
R/W
R/W
R/W
EEOPINT ERXEINT ESELFINT EOSCINT EFLWEINT ETXINT
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
R/W
ERXFINT
Bit1
R/W
Reset Value
ERXINT 00000000
Bit0
Address:
0x64
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
EEOPINT: Enable End of Packet Interrupt
0: Disable End of Packet Interrupt.
1: Enable End of Packet Interrupt.
ERXEINT: Enable Receive FIFO Empty Interrupt
0: Disable Receive FIFO Empty Interrupt.
1: Enable Receive FIFO Empty Interrupt.
ESELFINT: Enable Self Initialization Complete Interrupt
0: Disable Self Initialization Complete Interrupt.
1: Enable Self Initialization Complete Interrupt.
EOSCINT: Enable Oscillator Initialization Complete Interrupt
0: Disable Oscillator Initialization Complete Interrupt.
1: Enable Oscillator Initialization Complete Interrupt.
EFLWEINT: Enable Flash Write/Erase Operation Complete Interrupt
0: Disable Flash Write/Erase Operation Complete Interrupt.
1: Enable Flash Write/Erase Operation Complete Interrupt.
ETXINT: Enable Packet Transmitted Interrupt
0: Disable Packet Transmitted Interrupt.
1: Enable Packet Transmitted Interrupt.
ERXFINT: Enable Receive FIFO Full Interrupt
0: Disable Receive FIFO Full Interrupt.
1: Enable Receive FIFO Full Interrupt.
ERXINT: Enable Packet Received Interrupt
0: Disable Packet Received Interrupt.
1: Enable Packet Received Interrupt.
Rev. 1.0
33
CP2200/1
Register 8. INT1: Interrupt Status Register 1 (Self-Clearing)
R/W
R/W
—
—
Bit7
Bit6
RC
RC
WAKEINT LINKINT
Bit5
Bit4
RC
RC
RC
JABINT
Reserved
RFINT
Bit3
Bit2
Bit1
RC
Reset Value
ANCINT 00000000
Bit0
Address:
0x7F
Note: Reading this register will clear all INT1 interrupt flags.
Bits 7–6: UNUSED. Read = 00b, Write = don’t care.
Bit 5:
WAKEINT: “Wake-on-Lan” Interrupt Flag
0: The device has not been connected to a network since the last time WAKEINT was cleared.
1: The device has been connected to a network since the last time WAKEINT was cleared.
Bit 4:
LINKINT: Link Status Changed Interrupt Flag
0: The link status has not changed since the last time LINKINT was cleared.
1: The link status has changed (device has been connected or removed from a network).
Bit 3:
JABINT: Jabber Detected Interrupt Flag
0: A jabber condition has not been detected since the last time JABINT was cleared.
1: A jabber condition has been detected.
Bit 2:
ANFINT: Auto-Negotiation Failed Interrupt Flag
0: Auto-Negotiation has not failed since the last time ANFINT was cleared.
1: Auto-Negotiation has failed.
Bit 1:
Reserved: Read = 0.
Bit 0:
ANCINT: Auto-Negotiation Complete Interrupt
0: Auto-Negotiation has not completed since the last time ANCINT was cleared.
1: Auto-Negotiation has completed.
34
Rev. 1.0
CP2200/1
Register 9. INT1RD: Interrupt Status Register 1 (Read-Only)
R/W
R/W
—
—
Bit7
Bit6
R
R
R
R
R
R
Reset Value
WAKEINTR LINKINTR JABINTR ANFINTR Reserved ANCINTR 00000000
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x7E
Note: Reading this register will not clear INT1 interrupt flags.
Bits 7–6: UNUSED. Read = 00b, Write = don’t care.
Bit 5:
WAKEINTR: “Wake-on-Lan” Read-Only Interrupt Flag
0: The device has not been connected to a network since the last time WAKEINT was cleared.
1: The device has been connected to a network since the last time WAKEINT was cleared.
Bit 4:
LINKINTR: Link Status Changed Read-Only Interrupt Flag
0: The link status has not changed since the last time LINKINT was cleared.
1: The link status has changed (device has been connected or removed from a network).
Bit 3:
JABINTR: Jabber Detected Read-Only Interrupt Flag
0: A jabber condition has not been detected since the last time JABINT was cleared.
1: A jabber condition has been detected.
Bit 2:
ANFINTR: Auto-Negotiation Failed Read-Only Interrupt Flag
0: Auto-Negotiation has not failed since the last time ANFINT was cleared.
1: Auto-Negotiation has failed.
Bit 1:
Reserved: Read = 0b.
Bit 0:
ANCINTR: Auto-Negotiation Complete Read-Only Interrupt Flag
0: Auto-Negotiation has not completed since the last time ANCINT was cleared.
1: Auto-Negotiation has completed.
Rev. 1.0
35
CP2200/1
Register 10. INT1EN: Interrupt Enable Register 1
R/W
R/W
—
—
Bit7
Bit6
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
EWAKEINT ELINKINT EJABINT EANFINT Reserved EANCINT 00000000
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x7D
Bits 7–6: UNUSED. Read = 00b, Write = don’t care.
Bit 5:
EWAKEINT: Enable “Wake-on-Lan” Interrupt
0: Disable “Wake-on-Lan” Interrupt.
1: Enable “Wake-on-Lan” Interrupt.
Bit 4:
ELINKINT: Enable Link Status Changed Interrupt
0: Disable Link Status Changed Interrupt.
1: Enable Link Status Changed Interrupt.
Bit 3:
EJABINT: Enable Jabber Detected Interrupt
0: Disable Jabber Detected Interrupt.
1: Enable Jabber Detected Interrupt.
Bit 2:
EANFINT: Enable Auto-Negotiation Failed Interrupt
0: Disable Auto-Negotiation Failed Interrupt.
1: Enable Auto-Negotiation Failed Interrupt.
Bit 1:
Reserved: Read = 0b. Must write 0b.
Bit 0:
EANCINT: Enable Auto-Negotiation Complete Interrupt
0: Disable Auto-Negotiation Complete Interrupt.
1: Enable Auto-Negotiation Complete Interrupt.
36
Rev. 1.0
CP2200/1
9. Reset Sources
Reset circuitry allows the CP2200/1 to be easily placed in a predefined default condition. Upon entry to this reset
state, the following events occur:
All direct and indirect registers are initialized to their defined reset values.
Digital pins (except /RST) are forced into a high impedance state with a weak pull-up to VDD.
Analog pins (TX+/TX–, RX+/RX–) are forced into a high impedance state without a weak pull-up.
The external oscillator is stopped and /RST driven low (except on a software reset).
All interrupts are enabled.
The contents of the transmit and receive buffers are unaffected by a reset as long as the device has maintained
sufficient supply voltage. However, since the buffer pointers are reset to their default values, the data is effectively
lost unless the host processor has kept track of the starting address and length of each packet in the buffer.
The CP2200/1 has five reset sources that place the device in the reset state. The method of entry to the reset state
determines the amount of time spent in reset and the behavior of the /RST pin. Each of the following reset sources
is described in the following sections:
Power-On
Power-Fail
Oscillator-Fail
External /RST Pin
Software Command
Upon exit from the reset state, the device automatically starts the external oscillator and waits for it to settle (this
step is skipped on software reset). Once the crystal oscillator settles, the Oscillator Initialization Complete interrupt
occurs (interrupt pin asserted), and the host processor may now access the internal registers to poll for the Self
Initialization Complete Interrupt. If the host does not have access to the interrupt signal, it should wait
approximately 1 ms after the rising edge of reset pin prior to polling the internal registers. Note that the reset pin
could remain low up to 100 ms depending on the power supply ramp time.
The device is fully functional after the Self Initialization has completed. See “6.2. Reset Initialization” on page 18 for
the recommended initialization procedure following a device reset.
Rev. 1.0
37
CP2200/1
9.1. Power-On Reset
volts
During power-up, the CP2200/1 is held in the reset state, and the /RST pin is driven low until VDD settles above
VRST. A delay (TPORDelay) occurs between the time VDD reaches VRST and the time the device is released from
reset; the typical delay is 5 ms. Refer to Table 13 for the Electrical Characteristics of the power supply monitor
circuit.
VDD
VD
D
V RST
1.0
t
Logic HIGH
/RST
T PORDelay
Logic LOW
VDD
Monitor
Reset
Power-On
Reset
Figure 14. Reset Timing
38
Rev. 1.0
CP2200/1
9.2. Power-fail
When a power-down transition or power irregularity causes VDD to drop below VRST, the power supply monitor will
drive the /RST pin low and return the CP2200/1 to the reset state. When VDD returns to a level above VRST, the
CP2200/1 will be released from the reset state as shown in Figure 14.
The power supply monitor circuit (VDD Monitor) is enabled and selected as a reset source by hardware following
every power-on reset. To prevent the device from being held in reset when VDD drops below VRST, the VDD Monitor
may be deselected as a reset source (see RSTEN on page 42) and disabled (see VDMCN on page 39). It is
recommended to leave the VDD Monitor enabled and selected as a reset source at all times.
Register 11. VDMCN: VDD Monitor Control Register
R/W
R/W
R
R
R
R
R
R
Reset Value
VDMEN VDDSTAT Reserved Reserved Reserved Reserved Reserved Reserved 00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x13
VDMEN: VDD Monitor Enable
This bit can be used to disable or enable the VDD Monitor Circuit. Note: The VDD Monitor circuit is
enabled and selected as a reset source following every power-on reset. If the VDD Monitor is
disabled and then reenabled during device operation, it must be allowed to stabilize before it is
selected as a reset source. Selecting the VDD Monitor as a reset source before it has stabilized will
generate a system reset. See Table 13 on page 42 for the minimum VDD Monitor turn-on time.
0: VDD Monitor Disabled.
1: VDD Monitor Enabled.
Bit6:
VDDSTAT: VDD Status
This bit indicates the current power supply status (VDD Monitor output).
0: VDD voltage is at or below the VDD Monitor threshold.
1: VDD voltage is above the VDD Monitor threshold.
Bits 5–0: RESERVED. Read = varies; Write = don’t care.
Bit 7:
9.3. Oscillator-Fail Reset
If the system clock derived from the oscillator fails for any reason after oscillator initialization is complete, the reset
circuitry will drive the /RST pin low and return the CP2200/1 to the reset state. The CP2200/1 will remain in the
reset state for approximately 1 ms then exit the reset state in the same manner as that for the power-on reset.
9.4. External Pin Reset
The external /RST pin provides a means for external circuitry to force the CP2200/1 into a reset state. Asserting the
/RST pin low will cause the CP2200/1 to enter the reset state. It is recommended to provide an external pull-up
and/or decoupling capacitor of the /RST pin to avoid erroneous noise-induced resets. The CP2200/1 will exit the
reset state approximately 4 µs after a logic high is detected on /RST.
Rev. 1.0
39
CP2200/1
9.5. Software Reset
The software reset provides the host CPU the ability to reset the CP2200/1 through the parallel host interface.
Writing a ‘1’ to RESET (SWRST.2) will force the device to enter the reset state with the exception that the external
oscillator will not be stopped. As soon as the device enters the reset state, it will immediately exit the reset state
and start device calibration; the Oscillator Initialization Complete interrupt is not be generated. After Self
Initialization is complete, the device is fully functional.
Note: The software reset is enabled after every reset; however, it may be de-selected as a reset source (see the register
description for RSTEN on page 42).
Register 12. SWRST: Software Reset Register
R\W
R\W
R/W
R/W
R/W
W
R/W
R/W
Reset Value
—
—
—
—
—
RESET
—
—
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x75
Bits 7–3: UNUSED. Read = 00000b, Write = don’t care.
Bit 2:
RESET: Software Reset Initiate
Writing a ‘1’ to this bit will generate a software reset.
Bits 1–0: UNUSED. Read = 00b, Write = don’t care.
40
Rev. 1.0
CP2200/1
9.6. Determining the Source of the Last Reset
The RSTSTA register can be used to determine the cause of the last reset. Note: If the PORSI bit is set to logic 1,
all other bits in RSTSTA are undefined. It is impossible to differentiate between a power-on, power-fail, and
oscillator-fail reset by reading the RSTSTA register.
Register 13. RSTSTA: Reset Source Status Register
R/W
R/W
R/W
R/W
R/W
R
R
R
Reset Value
—
—
—
—
—
SWRSI
PORSI
PINRSI
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x73
Bits 7–3: UNUSED. Read = 00000b, Write = don’t care.
Bit 2:
SWRSI: Software Reset Indicator
0: Source of last reset was not a write to RESET (SWRESET.2).
1: Source of last reset was a write to RESET (SWRESET.2).
Bit 1:
PORSI: Power-On / Power-Fail / Oscillator-Fail Reset Indicator
0: Source of last reset was not a power-on, power-fail, or oscillator-fail event.
1: Source of last reset was a power-on, power-fail, or oscillator-fail event.
Bit 0:
PINRSI: External Pin Reset Indicator
0: Source of last reset was not the /RST pin.
1: Source of last reset was the /RST pin.
Rev. 1.0
41
CP2200/1
9.7. De-Selecting Interrupt Sources
The power-fail (VDD Monitor) reset is automatically enabled after every power-on reset. The software reset is
enabled after every device reset, regardless of the reset source. The RSTEN register can be used to prevent either
of these two reset sources from generating a device reset.
Register 14. RSTEN: Reset Enable Register
R/W
R/W
R/W
R/W
R/W
—
—
—
—
—
Bit7
Bit6
Bit5
Bit4
Bit3
R/W
R/W
ESWRST EPFRST
Bit2
Bit1
R/W
Reset Value
—
00000100
Bit0
Address:
0x72
Bits 7–3: UNUSED. Read = 00000b, Write = don’t care.
Bit 2:
ESWRST: Enable Software Reset
0: Software reset is not selected as a reset source.
1: Software reset is selected as a reset source.
Bit 1:
EPFRST: Enable Power Fail Reset
0: The power fail detection circuitry (VDD Monitor) is not selected as a reset source.
1: The power fail detection circuitry (VDD Monitor) is selected as a reset source.
Bit 0:
UNUSED. Read = 0b, Write = don’t care.
Table 13. Reset Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
Conditions
Min
Typ
Max
UNITS
IOL = 8.5 mA
—
—
0.6
V
RST Input High Voltage
0.7 x VDD
—
—
V
RST Input Low Voltage
—
—
0.3 x VDD
V
RST Input Pullup Current
—
25
50
µA
VDD POR Threshold (VRST)
2.2
2.4
2.6
V
Minimum /RST Low Time to
Generate a System Reset
15
—
—
µs
VDD Monitor Turn-on Time
100
—
—
µs
—
20
50
RST Output Low Voltage
VDD Monitor Supply Current
42
Rev. 1.0
CP2200/1
10. Power Modes
The CP2200/1 has four power modes that can be used to minimize overall system power consumption. The power
modes vary in device functionality and recovery methods. Each of the following power modes is explained in the
following sections:
Normal Mode (Device Fully Functional)
Link Detection Mode (Transmitter Disabled)
Memory Mode (Transmitter and Receiver Disabled)
Shutdown Mode (Oscillator Output Disabled)
The power modes above are achieved by disabling specific primary functions of the CP2200/1. Figure 15 shows
how power is distributed throughout the CP2200/1. To further reduce power consumption in any of the power
modes, secondary device functions may be turned off individually. The secondary device functions that may be
turned off are:
Link/Activity LED Drivers
Weak pull-ups to VDD
VDD Monitor
Weak
Pullups
All Digital Pins
Link LED
LINK (LA) Pin
Activity LED
ACT Pin
VDD
VDMCN.7
PHYCN.7
VDD Monitor
OSCPWR.0
System
Clock
(Oscillator)
IOPWR
PHY
TXEN
(PHYCN.6)
Transmitter
Parallel Host
Interface
TX and RX
Buffers
RXEN
(PHYCN.5)
Receiver
MAC
Flash Memory
Figure 15. Power and Clock Distribution Control
Rev. 1.0
43
CP2200/1
10.1. Normal Mode
Normal Mode should is used whenever the host is sending or receiving packets. In this mode, the CP2200/01 is
fully functional. Typical Normal Mode power consumption is listed in Table 2 on page 9.
Note: When in normal mode, the transmitter has a power saving mode which is enabled on reset. This power saving mode disables the transmitter's output driver and placed the TX+/- pins in high impedance when the CP220x is not transmitting
link pulses or data. To meet the minimum transmitter loss requirements in IEEE 802.3, this power saving mode should be
disabled. See Register 17, “TXPWR: Transmitter Power Register,” on page 46 for details.
10.2. Link Detection Mode
In Link Detection Mode, the transmitter and link pulse generation logic is disabled. The CP2200/1 will appear to be
“offline” because link pulses will not be generated. The most common way to use Link Detection Mode is enabling
the Wake-on-LAN interrupt, placing the CP2200/01 into Link Detection Mode, then placing the MCU in a low power
mode until the system is plugged into a network.
Note: When using link detection mode, the user should ensure that the link partner is always transmitting link pulses. An example of this type of device would be a hub or a switch. Some notebook PCs implement a power saving feature in which
they stop transmitting link pulses if a valid link is not detected. This would create a situation where both link partners are
waiting for each other to start transmitting link pulses.
Note: A minimum transmitter return loss is specified in IEEE 802.3. If the transmitter is disabled, the TX± pins are placed in
high impedance mode and do not create the minimum return loss. The transmitter should not be disabled if the device is
considered "on a network" and valid link pulses are being received.
From Normal Mode, the device can be placed in Link Detection Mode by clearing TXEN (PHYCN.6) to “0”. To
return the device to Normal Mode, disable the physical layer by clearing PHYCN to 0x00, then re-enable the
physical layer using the startup procedure in Section 15.7 on page 90.
10.3. Memory Mode
In Memory Mode, the physical layer (receiver and transmitter) is placed in a low-power state, and the CP2200/1
can neither send nor receive packets. The only primary functions of the device that remain functional are the Flash
memory and RAM buffers. The RAM buffers are only accessible using the Random Access method described in
Section 7.1 on page 23.
The device can be placed in Memory Mode by clearing the three most significant bits of the PHYCN register to
‘000’. The device can be returned to normal mode by setting the three most significant bits of the PHYCN register
to ‘111’ and waiting the appropriate physical layer turn-on times for both the transmitter and the receiver. The
physical layer electrical characteristics including turn-on time are specified in Table 22 on page 93. To return the
device to Normal Mode, disable the physical layer by clearing PHYCN to 0x00, then re-enable the physical layer
using the startup procedure in Section 15.7 on page 90.
10.4. Shutdown Mode
Shutdown Mode is the lowest power mode for the CP2200/1. All primary and secondary functions are disabled,
and the system clock is disconnected from the oscillator. The device can recover from Shutdown Mode only
through a power-on or pin reset.
The device can be placed in Shutdown Mode using the following procedure:
Step 1: Disable the PHY by clearing the three most significant bits of PHYCN to ‘000’.
Step 2: Disable the LED drivers by clearing bits 2 and 3 of IOPWR to ‘00’.
Step 3: Disable the VDD Monitor (optional) by clearing VDMEN (VDMCN.7) to ‘0’.
Step 4: Disconnect the oscillator output from the rest of the device by clearing OSCOE (OSCPWR.0) to ‘0’.
This step should be performed last because the device will no longer respond until the next pin or
power-on reset.
44
Rev. 1.0
CP2200/1
10.5. Disabling Secondary Device Functions
The LED Drivers, weak pull-ups, and VDD Monitor can be disabled to minimize power consumption. The typical
supply current for the VDD Monitor is specified in Table 13 on page 42. Disabling weak pull-ups will save current if
the MOTEN and MUXEN pins are tied to ground, but will cause the address and data pins to float (causing
undefined device behavior and increased power consumption) if they are not externally driven or pulled to a
defined logic level using pull-up or pull-down resistors. The internal weak pull-ups should not be disabled unless all
digital pins are externally driven to a logic high or logic low state.
Register 15. IOPWR: Port Input/Output Power Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
—
—
—
ACTEN
LINKEN
WEAKD
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
R/W
Reset Value
Reserved 00000000
Bit0
Address:
0x70
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3
ACTEN: Activity LED Enable
0: Activity LED disabled.
1: Activity LED enabled.
Bit 2
LINKEN: Link LED Enable (Link/Activity LED on CP2201)
0: Link (Link/Activity) LED disabled.
1: Link (Link/Activity) LED enabled.
Bit 1:
WEAKD: Weak Pull-up Disable
0: Weak pull-ups are enabled.
1: Weak pull-ups are disabled.
Bit 0:
Reserved. Read = 0b; Must write 0b.
Rev. 1.0
45
CP2200/1
Register 16. OSCPWR: Oscillator Power Register
R/W
R/W
R/W
—
—
—
Bit7
Bit6
Bit5
R/W
R/W
R/W
R
Reserved Reserved Reserved Reserved
Bit4
Bit3
Bit2
Bit1
R/W
Reset Value
OSCOE 00000010
Bit0
Address:
0x7C
Bits 7–5:
Bit 4–2:
Bit 1:
Bit 0:
UNUSED. Read = 0000b, Write = don’t care.
RESERVED. Read = 100b; Must write x00b.
UNUSED. Read = 1b; Write = don’t care.
OSCOE: Oscillator Output Enable
This bit controls the output of the external oscillator. It does not affect the external crystal driver.
0: Oscillator output disabled. The device will no longer respond until the next reset.
1: Oscillator output enabled.
Register 17. TXPWR: Transmitter Power Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
PSAVED Reserved Reserved Reserved Reserved Reserved Reserved Reserved 00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x7A
Bit 7:
PSAVED. Transmitter Power Save Mode Disable Bit
0: Enable transmitter power saving mode.
1: Disable transmitter power saving mode.
Bits 6–0: Reserved. Read = varies; Must write 0000000b.
46
Rev. 1.0
CP2200/1
11. Transmit Interface
11.1. Overview
The CP2200/1 provides a simple interface for transmitting Ethernet packets requiring the host to only load the
source and destination addresses, length/type, and data into the transmit buffer. All other IEEE 802.3
requirements, such as the preamble, start frame delimiter, CRC, and padding (full-duplex only), are automatically
generated. Figure 16 shows a typical Ethernet packet.
Destination MAC Address
(6 bytes)
Source MAC Address
(6 bytes)
Length/Type (2 bytes)
Data (46 to 1500 bytes)
(Automatically padded with
zeros if less than 46 bytes)
Ethernet Frame (minimum 64 bytes)
Obtained from Transmit Buffer
Preamble and Start Frame
Delimiter (8 bytes)
CRC (4 bytes)
Figure 16. Typical Ethernet Packet
Rev. 1.0
47
CP2200/1
11.2. Transmitting a Packet
Once reset initialization is complete (See ), the CP2200/1 is ready to transmit Ethernet packets. The following
procedure can be used to transmit a packet:
Step 1: Wait for the previous packet to complete (TXBUSY == 0x00). The worst case time to transmit a
packet is 500 ms in half-duplex mode with exponential backoff.
Step 2: Set the TXSTARTH:TXSTARTL transmit buffer pointer to 0x0000.
Step 3: If the last packet was aborted ((TXSTA3 & 0xF8) != 0x00), then this packet must be loaded into the
transmit buffer using the Random Memory Access Method:
a. Set RAMADDRH:RAMADDRL to 0x0000.
b. Write the first data byte to RAMTXDATA.
c. Increment RAMADDRH:RAMADDRL.
d. Write another data byte to RAMTXDATA.
e. Repeat steps c and d until the entire packet is loaded.
f. Pad small packets to at least 64 bytes.
g. Set TXENDH:TXENDL to the address of the last byte added. This value must be greater than or
equal to 0x0040.
Step 4: If the last packet was successfully transmitted ((TXSTA2 & 0x80) == 0x80), then this packet may be
loaded into the transmit buffer using the AutoWrite Interface:
a. Write all data bytes to the TXAUTOWR register, one byte at time.
b. If the MAC is in half-duplex mode, pad small packets to at least 64 bytes.
Step 5: Set the TXSTARTH:TXSTARTL transmit buffer pointer back to 0x0000.
Step 6: Write a ‘1’ to the TXGO bit (TXCN.0) to begin transmission.
Note: Step 4 may be skipped if Step 3 is always performed.
11.3. Overriding Transmit Configuration Options
The global transmit configuration options are set in the MAC registers. The transmit interface allows the host
processor to customize packet transmission on a per-packet basis by overriding the global MAC settings. The
following options can be overridden by the transmit interface:
Short Frame Padding—When enabled, ensures that no frame smaller than 64 bytes is transmitted. The frame
size does not include the 8 byte preamble; however, the 4-byte CRC field is included.
CRC Generation—When enabled, a 32-bit CRC will be calculated and appended to the Ethernet frame.
Pause packet transmission (Full Duplex Mode)—When enabled, an Ethernet PAUSE packet with a pause value
of TXPAUSEH:TXPAUSEL is transmitted. The pause value is in units of 512 bit times (51.2 µs).
Application of Back Pressure (Half Duplex Mode).
Switching between Half/Full Duplex Modes. Note: This setting does not affect the physical layer.
11.4. Transmit Buffer and AutoWrite Interface
The transmit buffer provides the AutoWrite interface to efficiently load the buffer with an entire packet. The interface
consists of three registers: TXSTART, TXEND, and TXAUTOWR. The TXSTART register points to the address of
the next available byte and can be reset to the first byte of the buffer. TXEND points to the last byte added to the
buffer. TXAUTOWR is the data register. Each write to TXAUTOWR sets TXEND to the address of the byte written
and increments TXSTART. After the packet is loaded into the buffer, TXSTART is reset to 0x0000 to mark the
starting point of the packet. TXEND will continue to point to the last byte in the packet.
Note: The AutoWrite Interface cannot be used following an aborted packet. This only applies if the device is in half-duplex
mode.
48
Rev. 1.0
CP2200/1
11.5. Transmit Status and Control Registers
The CP2200 transmit interface is controlled and managed through the registers in Table 14. After each packet is
transmitted, information about the last transmitted packet can be obtained from the 52-bit transmit status vector
accessible through the TXSTA0 — TXSTA6 registers. The transmit status vector is described in Table 15.
Table 14. Transmit Status and Control Register Summary
Register
Long Name
Address
Description
TXCN
Transmit Control
0x53
Contains the transmit configuration option override bits and the TXGO bit used to start packet
transmission.
TXBUSY
Transmit Busy Indicator
0x54
Read-only register returning 0x01 when transmit
interface is currently transmitting a packet and
0x00 when transmit interface is not transmitting.
TXPAUSEH
TXPAUSEL
Transmit Pause High and Low Bytes
0x55
0x56
16-bit pause value used for PAUSE packet
transmission. The pause value is in units of 512
bit times (51.2μs).
TXSTARTH
TXSTARTL
Transmit Data Starting Address High
and Low Bytes
0x59
0x5A
Starting address of outgoing packet in the transmit buffer. Packets added to the transmit buffer
must start at 0x0000.
TXENDH
TXENDL
Transmit Data Ending Address High
and Low Bytes
0x57
0x58
Address of last byte added to the transmit
buffer. This register is managed by hardware.
0x03
Writes to this register add a byte to the transmit
buffer, set TXEND to the address of the written
byte, and increment TXSTART.
0x5C
0x5D
0x5E
0x5F
0x60
0x61
0x62
52-bit transmit status vector containing information about the last transmitted packet including
collision count, successful transmission, total
bytes transmitted, etc.
TXAUTOWR Transmit Data AutoWrite
TXSTA6
TXSTA5
TXSTA4
TXSTA3
TXSTA2
TXSTA1
TXSTA0
Transmit Status Vector
Rev. 1.0
49
CP2200/1
Table 15. Transmit Status Vector Description
Bit
Description
51
Transmitted VLAN Frame
Last frame transmitted had length/type field of 0x8100 (VLAN
protocol Identifier).
50
Back Pressure Applied
Back pressure was applied during transmission.
49
Transmitted PAUSE Frame
Last frame transmitted was a valid PAUSE control frame.
48
Transmitted Control Frame
Last frame transmitted was a control frame.
Total Bytes Transmitted
Number of bytes transmitted on wire including all bytes from
collided attempts.
31
Transmit Under-Run
Last packet was aborted due to a data under-run condition.
30
Jumbo Packet Detected
Last packet was aborted due to the detection of a Jumbo
packet (oversized frame). Jumbo packets are not supported.
29
Late Collision Detected
Last packet was aborted due to a collision occurring after the
51.2 µs collision window.
28
Excessive Collisions Detected
Last packet was aborted due to detection of 16 or more collisions.
27
Excessive Delay Detected
Aborted due to a delay longer than 2.42ms.
26
Delay Detected
Last packet was transmitted, but had delay (less than 2.42
ms).
25
Transmitted Broadcast Packet
Last packet transmitted had a broadcast destination address.
24
Transmitted Multicast Packet
Last packet transmitted had a multicast destination address.
23
Transmit Successful
Last packet was successfully transmitted.
22
Type Field Detected
Last packet’s length/type field had a value greater than 1500.
21
Length Check Error
Last packet’s length/type field had a value less than or equal
to 1500 which did not match the actual frame length.
20
CRC Error
Last packet’s CRC field did not match the internally generated
CRC.
19-16
Transmit Collision Count
Number of collisions encountered during transmission of the
last packet.
15-0
Transmit Byte Count
Number of bytes in last frame not counting collided bytes.
47-32
50
Field Name
Rev. 1.0
CP2200/1
Register 18. TXCN: Transmit Control Register
R/W
R/W
OVRRIDE
—
Bit7
Bit6
R/W
R/W
R/W
R/W
R/W
CRCENOV PADENOV TXPPKT BCKPRES FDPLXOV
Bit5
Bit4
Bit3
Bit2
W
Reset Value
TXGO
00000000
Bit0
Address:
Bit1
0x53
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
OVRRIDE: Default Override
0: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be ignored. MAC settings will take effect.
1: Settings for bits 5, 4, 3, 2, and 1 in TXCN will be applied. MAC settings will be overridden.
UNUSED. Read = 0b, Write = don’t care.
CRCENOV: CRC Enable
0: Disable CRC append on transmission.
1: Enable CRC append on transmission.
PADENOV: Pad Enable
0: Disable padding of short frames.
1: Enable padding of short frames.
TXPPKT: Transmit a PAUSE control packet
0: Normal packet transmission. Packet data will be obtained from the transmit buffer.
1: A PAUSE control packet with the value of TXPAUSEH:TXPAUSEL will be transmitted. Data in the
transmit buffer will not be accessed. PAUSE control packets are only valid in full-duplex mode.
BCKPRES: Apply Back Pressure
0: Normal packet transmission. Back pressure will not be applied.
1: Back pressure will be applied on transmission (only valid in half duplex mode).
FDPLXOV: Full Duplex Operation
Note: The transmit interface, MAC, and physical layer must be configured to the same duplex mode.
0: Transmit interface operates in half duplex mode.
1: Transmit interface operates in full duplex mode.
TXGO: Transmit Packet
Set this bit to ‘1’ to begin transmission of a packet.
Note: TXGO should not be set to one if both TXSTART and TXEND are zero (i.e., no data has been
added to the buffer).
Register 19. TXBUSY: Transmit Busy Indicator
R
R
R
R
R
R
R
—
—
—
—
—
—
—
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
R
Reset Value
TXBUSY 00000000
Bit0
Address:
0x54
Bits 7–1: UNUSED. Read = 0000000b, Write = don’t care.
Bit 0:
TXBUSY: Packet Transmit Status
0: Packet Transmit is not in progress.
1: Packet Transmit is in progress.
Rev. 1.0
51
CP2200/1
Register 20. TXPAUSEH: Transmit Pause High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x55
Bits 7–0: TXPAUSEH: Transmit Pause High Byte
High byte of the 16-bit pause value sent in a PAUSE control packet. The pause value is in units of
512 bit times (512 bit times = 51.2 µs).
Register 21. TXPAUSEL: Transmit Pause Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x56
Bits 7–0: TXPAUSEL: Transmit Pause Low Byte
Low byte of the 16-bit pause value sent in a PAUSE control packet. The pause value is in units of
512 bit times (512 bit times = 51.2 µs).
Register 22. TXSTARTH: Transmit Data Starting Address High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x59
Bits 7–0: TXSTARTH: Transmit Data Starting Address High Byte
High byte of the starting address of outgoing packet in the transmit buffer. Note: Outgoing packets
must start at 0x0000.
Register 23. TXSTARTL: Transmit Data Starting Address Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x5A
Bits 7–0: TXSTARTL: Transmit Data Starting Address Low Byte
Low byte of the starting address of outgoing packet in the transmit buffer. Note: Outgoing packets
must start at 0x0000.
52
Rev. 1.0
CP2200/1
Register 24. TXENDH: Transmit Data Ending Address High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x57
Bits 7–0: TXENDH: Transmit Data Ending Address High Byte
High byte of the address of the last byte added to the transmit buffer.
Register 25. TXENDL: Transmit Data Ending Address Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x58
Bits 7–0: TXENDL: Transmit Data Ending Address Low Byte
Low byte of the address of the last byte added to the transmit buffer.
Register 26. TXAUTOWR: Transmit Data AutoWrite
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x03
Bits 7–0: TXSTARTL: Transmit Data Starting Address Low Byte
Writes to this register add a single byte to the transmit buffer and set the TXEND pointer to the
address of the byte currently being written.
Rev. 1.0
53
CP2200/1
Register 27. TXSTA6: Transmit Status Vector 6
R/W
R/W
R/W
R/W
—
—
—
—
Bit7
Bit6
Bit5
Bit4
R
R
TXVLAN BCKPRES
Bit3
Bit2
R
R
Reset Value
TXPF
TXCF
00000000
Bit1
Bit0
Address:
0x5C
Note: This register contains bits 51–48 of the Transmit Status Vector.
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3.
TXVLAN: Transmitted VLAN Frame
0: Transmitted frame had length/type field of 0x8100.
1: Transmitted frame did not have a length/type field of 0x8100.
Bit 2:
BCKPRES: Back Pressure Applied
0: Back pressure was not applied during transmission.
1: Back pressure was applied during transmission.
Bit 1:
TXPF: Transmitted PAUSE Frame
0: Transmitted frame was not a PAUSE control frame.
1: Transmitted frame was a valid PAUSE control frame.
Bit 0:
TXCF: Transmitted Control Frame
0: Transmitted frame was not a control frame.
1: Transmitted frame was a control frame.
Register 28. TXSTA5: Transmit Status Vector 5
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x5D
Note: This register contains bits 47–40 of the Transmit Status Vector.
Bits 7–0: TXSTA5: Total Bytes Transmitted High Byte
The most significant 8-bits of the total number of bytes transmitted on the wire, including all bytes
from collided attempts.
54
Rev. 1.0
CP2200/1
Register 29. TXSTA4: Transmit Status Vector 4
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x5E
Note: This register contains bits 40-32 of the Transmit Status Vector.
Bits 7-0: TXSTA4: Total Bytes Transmitted Low Byte
The least significant 8-bits of the total number of bytes transmitted on the wire, including all bytes
from collided attempts.
Register 30. TXSTA3: Transmit Status Vector 3
R
R
R
TXURUN TXJUMBO TXLTCL
Bit7
Bit6
Bit5
R
R
R
TXEXCL
TXEXDE
TXDE
Bit4
Bit3
Bit2
R
R
Reset Value
TXBCAST TXMCAST 00000000
Bit1
Bit0
Address:
0x5F
Note: This register contains bits 31–24 of the Transmit Status Vector.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
TXURUN: Transmit Under-Run
0: Transmit under-run did not occur.
1: Packet aborted due to data under-run condition.
TXJUMBO: Jumbo Packet Detected
0: Transmitted packet was not oversized.
1: Packet aborted due to its excessive size.
TXLTCL: Late Collision Detected
0: Late collision was not detected.
1: Packet aborted due to the detection of a collision after the 51.2 us collision window.
TXEXCL: Excessive Collisions Detected
0: Number of collisions on transmission was less than 16.
1: Packet aborted due to detection of 16 or more collisions.
TXEXDE: Excessive Delay Detected
0: Packet was transmitted without an excessive delay (greater than 2.42 ms). Please check other
flags for information.
1: Packet was aborted due to an excessive delay (greater than 2.42 ms).
TXDE: Delay Detected
0: Packet was transmitted with no delay or was aborted. Please check other flags for information.
1: Packet was transmitted, but had some delay (less than 2.4 ms).
TXBCAST: Transmitted Broadcast Packet
0: Transmitted packet did not have a broadcast destination address.
1: Transmitted packet had a broadcast destination address.
TXMCAST: Transmitted Multicast Packet
0: Transmitted packet did not have a multicast destination address.
1: Transmit packet had a multicast destination address.
Rev. 1.0
55
CP2200/1
Register 31. TXSTA2: Transmit Status Vector 2
R
TXOK
Bit7
R
R
R
R
TXTYPE TXLCERR TXCRCER TXCOL3
Bit6
Bit5
Bit4
R
R
TXCOL2
TXCOL1
Bit2
Bit1
Bit3
R
Reset Value
TXCOL0 00000000
Bit0
Address:
0x60
Note: This register contains bits 23–16 of the Transmit Status Vector.
Bit 7:
TXOK: Transmit Successful
0: Transmission was aborted.
1: Transmission was successful.
Bit 6:
TXLOOR: Type Field Detected
0: Last packet’s type/length field was used as a length.
1: Last packet’s type/length field was used as a type.
Bit 5:
TXLCERR: Length Check Error
0: Last packet’s length field matched the actual frame length.
1: Last packet’s length field did not match the actual frame length.
Bit 4:
TXCRCER: CRC Error
0: Last packet’s CRC matched the internally generated CRC.
1: Last packet’s CRC did not match the internally generated CRC.
Bits 3–0: TXCOL3-0: Transmit Collision Count
Number of collisions encountered during transmission of the last packet.
Note: This bit field does not overflow and will remain at 1111b (15 collisions) if 15 or more collisions
are encountered.
Register 32. TXSTA1: Transmit Status Vector 1
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x61
Note: This register contains bits 15–8 of the Transmit Status Vector.
Bits 7–0: TXSTA1: Transmit Byte Count High Byte
The most significant 8-bits of the number of bytes in the last transmitted frame. Does not include
bytes transmitted due to collided attempts.
56
Rev. 1.0
CP2200/1
Register 33. TXSTA0: Transmit Status Vector 0
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x62
Note: This register contains bits 15–8 of the Transmit Status Vector.
Bits 7–0: TXSTA0: Transmit Byte Count Low Byte
The least significant 8-bits of the number of bytes in the last transmitted frame. Does not include
bytes transmitted due to collided attempts.
Rev. 1.0
57
CP2200/1
12. Receive Interface
12.1. Overview
The CP2200/1 has a 4k circular receive FIFO buffer and an 8 entry translation look-aside buffer (TLB) capable of
storing up to 8 packets at a time. Each TLB entry holds the starting address, length, and other information about a
single received packet. Once a packet is received, the host microcontroller is notified using the interrupt request
pin. The host microcontroller may then copy the contents of the packet to its local memory through the host
interface or skip the packet by writing ‘1’ to RXSKIP (RXCN.1). Skipped packets remain in memory but will be
overwritten as new packets arrive.
The receive interface has an advanced receive filter and hash table to prevent unwanted packets from reaching the
receive buffer. For all packet types not supported by the receive filter, the CP2200/1 allows the host microcontroller
complete random access to the receive buffer. The host microcontroller can check specific bytes in the packet to
determine whether or not to copy the packet.
.
Host Interface Registers
Autoread Interface:
Autoread Data Register
Packet Skip Bit
Current Packet:
Packet Address
Packet Length
Packet Information
4 KB
Receive
Buffer
with
8-entry TLB
Programmable
Receive Filter and
Hash Table
Figure 17. Receive Interface Block Diagram
12.2. Reading a Packet Using the Autoread Interface
Once reset initialization is complete (Section 6.2 on page 18) and the receive buffer, filter, and hash table (Section
12.4) are initialized, the CP2200/1 is ready to receive Ethernet packets. After receiving notification of a new packet,
the following procedure can be used to read the packet:
Step 1: Read RXVALID (CPINFOH.7) and RXOK (CPINFOL.7) to check if the current packet was received
correctly. The host processor may optionally use the packet starting address CPADDR to read
specific bytes in the packet and determine whether to copy or skip the current packet. The random
access method described in Section 7.1 on page 23 can be used to access the buffer.
Step 2: If RXVALID or RXOK is 0, or to skip the packet, write a ‘1’ to RXSKIP (RXCN.1).
If RXVALID and RXOK are 1, read the length of the current packet from CPLENH:CPLENL.
Step 3: Read the entire packet, one byte at a time, by reading RXAUTORD.
Step 4: If the entire packet was read, write a ‘1’ to RXCLRV (RXCN.2).
If there are any unread bytes remaining in the current buffer, write a ‘1’ to RXSKIP (RXCN.1).
12.3. Timing and Buffer Overflow Considerations
For 10 Base-T Ethernet, a minimum-sized packet of 64 bytes is received in 51.2 us. The maximum number of
packets that can be held by the receive buffer is eight. To ensure that pointer corruption does not occur, software
should disable packet reception (RXINH = 1) after the seventh packet has arrived in the receive buffer. If the ability
to service the packet received interrupt is longer than 51.2us, then software should use the random access method
to retrieve data from the receive buffer. The random access method described in Section 7.1 on page 23.
58
Rev. 1.0
CP2200/1
Note: The value of CPADDRH:CPADDRL may be invalid if an overflow event occurs. After an overflow, the FIFOHEADH:FIFOHEADL pointer should be used to determine the starting address of the current packet. CPLEN will always remain valid
even after an overflow event.
Note: If the Receive FIFO Full Interrupt is triggered, the interrupt flag must be cleared to re-enable packet reception. The
Receive FIFO Full Interrupt is triggered based on the size of packets or on the number of packets. If triggered based on
the number of packets, then pointer corruption has occurred.
12.4. Initializing the Receive Buffer, Filter and Hash Table
After a device reset, the receive buffer is empty and the filter is configured to accept broadcast packets and
multicast packets matching a hash value of 0x0400. This hash value allows PAUSE control packets to pass
through the receive filter.
The receive buffer does not require any additional initialization. The receive filter can be configured to accept or
ignore broadcast packets, multicast packets, runt packets (Ethernet Frame smaller than 64 bytes), and packets
with a CRC error. The receive filter is configured using the RXFILT register.
The device can be configured to accept broadcast packets and packets addressed to the controller’s MAC address
without using the hash table. If multicast packets need to be accepted, then the hash table can be programmed to
accept packets addressed to specific address ranges.
The CP2200/1 implements a 16-bit hash table to represent all possible addresses in the 64-bit address space.
Each of the possible 65536 possible values for the hash table represent a range of MAC addresses. If all 16 bits
are set to ‘1’, all multicast addresses will be accepted. If all 16-bits are set to ‘0’, then all multicast addresses will be
rejected.The following procedure can be used to determine which bits to set for a specific address:
Step 1: Perform a 32-bit CRC on the 6-bytes of the address using 0xC704DD7B as the polynomial.
Step 2: Record the least significant 4 bits of the CRC result (Hash Index).
Step 3: The Hash Index determines the bit that should be set in the hash table that will allow the address to
be received. For example, if the least significant 4-bits of the CRC result are 101b (5d), then setting
bit 5 of the 16-bit hash table will allow all MAC addresses whose CRC result is 5d to be accepted.
Rev. 1.0
59
CP2200/1
12.5. Receive Status and Control Registers
The CP2200/1 receive interface is controlled and managed through the registers in Table 16. The current packet
registers provide information about the next packet to be unloaded from the receive buffer (the oldest packet
received).
Table 16. Receive Status and Control Register Summary
Register
Long Name
Address
Description
RXCN
Receive Interface Control
0x11
Contains receive interface control bits such as RXSKIP,
RXCLRV, RXRST, and RXINH.
RXSTA
Receive Interface Status
0x12
Indicates when the receive interface is busy receiving a
frame and when the current packet has been completely
read from the buffer.
RXAUTORD Receive AutoRead
0x01
Provides an efficient method of reading entire packets
sequentially from the receive buffer.
RXFILT
Receive Filter Configuration
0x10
Specifies the type of packets can pass through the
receive filter.
RXHASHH
RXHASHL
Multicast Hash Table
0x0E
0x0F
16-bit Hash Table used to filter multicast packets.
CPINFOH
CPINFOL
Current Packet Information
0x1D
0x1E
Specifies information about the current packet such as
broadcast/multicast, CRC errors, etc.
CPLENH
CPLENL
Current Packet Length
0x1F
0x20
Specifies the length of the current packet in the receive
buffer (in bytes).
CPADDRH
CPADDRL
Current Packet Address
0x21
0x22
Specifies the starting address of the current packet in
the receive buffer.
60
Rev. 1.0
CP2200/1
Register 34. RXCN: Receive Interface Control
R/W
R/W
R/W
R/W
R/W
W
—
—
—
—
RXINH
RXCLRV
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
W
W
Reset Value
RXSKIP RXCLEAR 00000000
Bit1
Bit0
Address:
0x11
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3:
RXINH: Receive Inhibit
Setting this bit to ‘1’ temporarily inhibits new packet reception. If a packet is currently being
received, reception will continue until the packet is received. Once set, this bit must be cleared to ‘0’
by software to resume packet reception.
Bit 2:
RXCLRV: Valid Bit Clear
Writing a ‘1’ to this bit clears the valid bit of the current packet, freeing up the buffer for new packets.
This action should only be started after all bytes of the current packet have been read (CPEND = 1).
If the packet is not completely read, RXSKIP should be used to discard the remaining bytes.
Bit 1:
RXSKIP: Skip Current Packet
Writing a ‘1’ to this bit updates discards the current packet by clearing its valid bit and advances the
AutoRead buffer pointer to the beginning of the next packet.
Bit 0:
RXCLEAR: Receive Buffer Clear
Writing a ‘1’ to this bit discards all packets in the receive buffer and resets all buffer pointers and
valid bits to zero. Note: Any packets currently in the buffer will remain in memory, however, all information such as the starting address and length of each packet will be lost. Any new packets that
arrive will overwrite the existing data.
Register 35. RXSTA: Receive Interface Status
R/W
R/W
R/W
R/W
R/W
R/W
R
—
—
—
—
—
—
CPEND
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
R
Reset Value
RXBUSY 00000000
Bit0
Address:
0x12
Bits 7–2: UNUSED. Read = 000000b, Write = don’t care.
Bit 1:
CPEND: Current Packet End Reached
This bit is automatically cleared by hardware when the valid bit for the current packet is cleared (see
RXCLRV description) or the current packet is discarded (see RXSKIP description).
0: The last byte of the current packet has not been read using the AutoRead interface.
1: The last byte of the current packet has been read using the AutoRead interface.
Bit 0:
RXBUSY: Receiving Packet
0: Receive interface is idle.
1: Receive interface is currently receiving a packet.
Rev. 1.0
61
CP2200/1
Register 36. RXAUTORD: Receive AutoRead Data Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x01
Bits 7–0: RXAUTORD: Receive AutoRead Data Register
Reads from this register read a single byte from the receive buffer and adjust the receive buffer
pointer RXFIFOHEAD accordingly.
Register 37. RXFILT: Receive Filter Configuration
R/W
R/W
R/W
R/W
—
—
—
—
Bit7
Bit6
Bit5
Bit4
R/W
R/W
R/W
R/W
Reset Value
IGNRUNT IGNERR IGNBCST IGNMCST 00001100
Bit3
Bit2
Bit1
Bit0
Address:
0x10
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3:
IGNRUNT: Ignore Runt Packets
0: Runt packets are not ignored.
1: Runt packets are ignored.
Bit 2:
IGNERR: Ignore FCS Error Packets
0: Packets with FCS error are not ignored.
1: Packets with FCS error are ignored.
Bit 1:
IGNBCST: Ignore Broadcast Packets
0: Broadcast packets are not ignored.
1: Broadcast packets are ignored.
Bit 0:
IGNMCST: Ignore Multicast Packets
0: Multicast packets are not ignored.
1: Multicast packets are ignored.
Register 38. RXHASHH: Multicast Hash Table High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000100
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x0E
Bits 7–0: RXHASHH: Multicast Hash Table High Byte
High Byte of 16-bit multicast hash table.
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Rev. 1.0
CP2200/1
Register 39. RXHASHL: Multicast Hash Table Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x0F
Bits 7–0: RXHASHL: Multicast Hash Table Low Byte
Low Byte of 16-bit multicast hash table.
Register 40. CPINFOH: Current Packet Information High Byte
R
R
RXVALID RXVLAN
Bit7
Bit6
R
R
R
R
R
R
Reset Value
RXUCF
RXPCF
RXCF
RXADATA
BCAST
MCAST
00000000
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x1D
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
RXVALID: Current packet valid
0: The current packet TLB slot is empty.
1: There is a packet in the current packet TLB slot.
RXVLAN: VLAN Type Detected
0: VLAN tagged frame not detected.
1: VLAN tagged frame detected.
RXUNSUP: Unsupported Control Frame
0: Unsupported control frame not detected.
1: Unsupported control frame detected.
RXPCF: Pause Control Frame
0: Pause control frame not detected.
1: Pause control frame detected.
RXCF: Control Frame
0: Control frame not detected.
1: Control frame detected.
RXADATA: Additional Data Received
0: Normal Operation.
1: 1 to 7 additional bits of data received following receipt of the packet.
BCAST: Broadcast Packet
0: Current packet is not a broadcast packet.
1: Current packet is a broadcast packet.
MCAST: Multicast Packet
0: Current packet is not a multicast packet.
1: Current packet is a multicast packet.
Rev. 1.0
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CP2200/1
Register 41. CPINFOL: Current Packet Information Low Byte
R
RXOK
Bit7
R
R
R
R
R
LENGTH LENERR CRCERR Reserved Reserved
Bit6
Bit5
Bit4
Bit3
Bit2
R
RXLEN
R
Reset Value
RXDROP 00000000
Bit1
Bit0
Address:
0x1E
Bit 7:
RXOK: Receive OK
0: Receive not OK.
1: Receive OK.
Bit 6:
LENGTH: Length/Type Field Detection
0: The length/type field of the current packet contains the packet length.
1: The length/type field of the current packet contains the packet type.
Bit 5:
LENERR: Length Check Error
0: No errors detected in length field.
1: The length field does not match actual packet length.
Bit 4:
CRCERR: CRC Error
0: CRC check passed.
1: CRC check failed.
Bits 3–2: Reserved: Read = varies.
Bit 1:
RXLEN: Receive Length
0: Normal Operation.
1: The data received is not long enough to form a valid packet.
Bit 0:
RXDROP: Packet Dropped
0: Normal operation.
1: A packet has been dropped.
Register 42. CPLENH: Current Packet Length High Byte
R
R
R
R
R
R
R
R
Reset Value
—
—
—
—
—
—
—
—
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x1F
Bits 7–0: CPLENH: Current Packet Length High Byte
High byte of the current packet length.
Register 43. CPLENL: Current Packet Length Low Byte
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x20
Bits 7–0: CPLENL: Current Packet Length Low Byte
Low byte of the current packet length.
64
Rev. 1.0
CP2200/1
Register 44. CPADDRH: Current Packet Address High Byte
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x21
Note:
The contents of this register are invalid following a buffer overflow event.
Bits 7–0: CPADDRH: Current Packet Address High Byte
High byte of the current packet starting address in the receive FIFO buffer.
Register 45. CPADDRL: Current Packet Address Low Byte
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x22
Note:
The contents of this register are invalid following a buffer overflow event.
Bits 7–0: CPADDRL: Current Packet Address Low Byte
Low byte of the current packet starting address in the receive FIFO buffer.
Rev. 1.0
65
CP2200/1
12.6. Advanced Receive Buffer Operation
Receive buffer operation is automatically handled by hardware and does not require any assistance from the host
processor. Note: The information in this section is provided for reference purposes only and will typically
not be used except when debugging a problem and additional control over the receive buffer is required.
Figure 18 shows a detailed block diagram of the receive buffer. As packets arrive and pass through the receive
filter, they are added to the circular receive buffer at the address pointed to by the tail pointer. The FIFO tail pointer
is incremented after each byte is received. As soon as a new packet arrives, the receive buffer controller searches
for an unused TLB slot to store data about the received packet. If an unused TLB slot is found, it is claimed and
assigned to the packet currently being received by setting the slot’s valid bit to ‘1’. A Packet Received interrupt will
be generated after the entire packet is copied to the buffer. If all 8 slots are full (valid bits for all slots are set to ‘1’),
then the packet will be dropped and a Receive FIFO Full interrupt will be generated.
Each TLB slot holds information about its assigned packet such as starting address in the buffer, length, and
information about the packet such as the type (broadcast, multicast, unicast) and any errors that occurred during
reception (CRC error, incomplete packet, etc.). The receive buffer controller rotates through the TLB slots in a
circular fashion. For debugging purposes, the host processor may access any TLB slot using the TLB registers
listed in Table 17.
Translation Look-aside Buffer
(8-entry circular or random access)
Copy of
Current TLB
FIFO Head Pointer
CPINFO/
CPLEN/
CPADDR
CPTLB
Current TLB
Entry Number
(e.g. 0 for TLB0)
RXAUTORD
0
1
TLB0
TLB1
1
1
TLB2
TLB3
0
TLB4
0
0
TLB5
TLB6
0
TLB7
Valid Bit
Packet #1
Packet #2
4 KB
Receive
Buffer
Packet #3
FIFO Tail Pointer
Current packet address,
length, and information.
Autoread interface automatically manages read pointers. TLB Entries are typically not
accessed by the host.
Figure 18. Receive Buffer Block Diagram
The oldest packet received starts at the address pointed to by the FIFO head pointer. This packet (packet #1 in
Figure 18) will be referred to as the current packet. The FIFO head pointer is used by the AutoRead interface to
read data from the current packet. As data is read using the AutoRead interface, the FIFO head pointer is
incremented until the entire packet is read out. Once the packet is read out, the host processor must clear the valid
bit of the packet by writing a ‘1’ to RXCLRV (RXCN.2). If the host processor chooses not to read the entire packet,
the valid bit should be cleared (and unread data skipped) by writing a ‘1’ to RXSKIP (RXCN.1).
A copy of the TLB slot associated with the current packet is always available by reading the CTLB registers listed in
Table 16. The same information can be obtained by reading CPTLB to determine the current TLB slot, then directly
accessing the slot using the registers in Table 17.
66
Rev. 1.0
CP2200/1
The Receive FIFO Full interrupt will be generated once all free space in the buffer is used or all TLB slots are filled.
The host processor should read the RXFIFOSTA register to determine the cause of the interrupt. To receive
additional packets after the buffer is filled, packets must be removed from the buffer by reading them out or
discarding them. Packets can be discarded one at a time or all at once by writing ‘1’ to RXCLEAR (RXCN.0).
12.7. Receive Buffer Advanced Status and Control Registers
The receive buffer is controlled and managed through the registers in Table 17. These registers are not commonly
accessed by the host processor except for debug purposes.
Table 17. Receive Status and Control Register Summary
Register
Long Name
Address
Description
CPTLB
Current Packet TLB Number
0x1A
Specifies the TLB number (0–7) associated with
the current packet.
TLBVALID
TLB Valid Indicator
0x1C
Indicates which TLBs currently have valid packets.
TLBnINFOH
TLBnINFOL
TLBn Packet Information
multiple
Specifies information about the packet associated with TLBn (n = 0–7).
TLBLENH
TLBLENL
TLBn Packet Length
multiple
Specifies the length of the packet associated
with TLBn (n = 0–7).
TLBnADDRH
TLBnADDRL
TLBn Packet Address
multiple
Specifies the starting address of the packet
associated with TLBn (n = 0–7).
RXFIFOTAILH
RXFIFOTAILL
Receive FIFO Buffer Tail Pointer
0x15
0x16
Points to the byte following the last valid byte.
This is where new packets are added.
RXFIFOHEADH Receive FIFO Buffer Head
RXFIFOHEADL Pointer
0x17
0x18
Points to the beginning of the current packet
and is incremented with each Auto Read.
RXFIFOSTA
0x5B
Indicates the cause of the Receive FIFO Buffer
Full interrupt.
Receive FIFO Buffer Status
Register 46. CPTLB: Current Packet TLB Number
R/W
R/W
R/W
R/W
R/W
—
—
—
—
—
Bit7
Bit6
Bit5
Bit4
Bit3
R/W
R/W
R/W
CPTLB
Bit2
Bit1
Reset Value
00000000
Bit0
Address:
0x1A
Bits 7–3: UNUSED. Read = 00000b; Write = don’t care.
Bits 2–0: CPTLB[2:0]: Current Packet TLB Number
The TLB Number (0–7) of the TLB slot associated with the current packet.
Rev. 1.0
67
CP2200/1
Register 47. TLBVALID: TLB Valid Indicator
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
VAL7
VAL6
VAL5
VAL4
VAL3
VAL2
VAL1
VAL0
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x1C
Bits 7–0: TLBVALID: TLB Valid Indicator
Displays the valid bits for the eight TLB slots in a single byte.
Note: This register may be used to clear multiple valid bits simultaneously. For all writes, bits with a
value of ‘0’ will cause the associated valid bit to be cleared, and bits with a value of ‘1’ will be
ignored. For example, writing 0xFE to this register will clear the valid bit for TLB0.
Register 48. TLBnINFOH: TLBn Information High Byte
R
R
Reserved RXVLAN
Bit7
Bit6
R
R
R
R
R
R
Reset Value
RXUCF
RXPCF
RXCF
RXADATA
BCAST
MCAST
00000000
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address: TLB0INFOH: 0x23; TLB1INFOH: 0x29; TLB2INFOH: 0x2F; TLB3INFOH: 0x35;
TLB4INFOH: 0x3B; TLB5INFOH: 0x41; TLB6INFOH: 0x47; TLB7INFOH: 0x4D
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
68
Reserved. Read = varies;
RXVLAN: VLAN Type Detected
0: VLAN tagged frame not detected.
1: VLAN tagged frame detected.
RXUNSUP: Unsupported Control Frame
0: Unsupported control frame not detected.
1: Unsupported control frame detected.
RXPCF: Pause Control Frame
0: Pause control frame not detected.
1: Pause control frame detected.
RXCF: Control Frame
0: Control frame not detected.
1: Control frame detected.
RXADATA: Additional Data Received
0: Normal Operation.
1: 1 to 7 additional bits of data received following receipt of the packet.
BCAST: Broadcast Packet
0: Packet is not a broadcast packet.
1: Packet is a broadcast packet.
MCAST: Multicast Packet
0: Packet is not a multicast packet.
1: Packet is a multicast packet.
Rev. 1.0
CP2200/1
Register 49. TLBnINFOL: TLBn Information Low Byte
R
RXOK
Bit7
R
R
R
R
R
LENGTH LENERR CRCERR Reserved Reserved
Bit6
Bit5
Bit4
Bit3
Bit2
R
RXLEN
R
Reset Value
RXDROP 00000000
Bit1
Bit0
Address: TLB0INFOH: 0x24; TLB1INFOH: 0x2A; TLB2INFOH: 0x30; TLB3INFOH: 0x36;
TLB4INFOH: 0x3C; TLB5INFOH: 0x42; TLB6INFOH: 0x48; TLB7INFOH: 0x4E
Bit 7:
RXOK: Receive OK
0: Receive not OK.
1: Receive OK.
Bit 6:
LENGTH: Length/Type Field Detection
0: The length/type field of the current packet contains the packet length.
1: The length/type field of the current packet contains the packet type.
Bit 5:
LENERR: Length Check Error
0: No errors detected in length field.
1: The length field does not match actual packet length.
Bit 4:
CRCERR: CRC Error
0: CRC check passed.
1: CRC check failed.
Bits 3–2: Reserved: Read = varies.
Bit 1:
RXLEN: Receive Length
0: Normal Operation.
1: The data received is not long enough to form a valid packet.
Bit 0:
RXDROP: Packet Dropped
0: Normal operation.
1: A packet has been dropped.
Register 50. TLBnLENH: TLBn Packet Length High Byte
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address: TLB0LENH: 0x25; TLB1LENH: 0x2B; TLB2LENH: 0x31; TLB3LENH: 0x37;
TLB4LENH: 0x3D; TLB5LENH: 0x43; TLB6LENH: 0x49; TLB7LENH: 0x4F
Bits 7–0: TLBnLENH: TLBn Packet Length High Byte
High byte of the packet length for the packet associated with TLBn.
Rev. 1.0
69
CP2200/1
Register 51. TLBnLENL: TLBn Packet Length Low Byte
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address: TLB0LENH: 0x26; TLB1LENH: 0x2C; TLB2LENH: 0x32; TLB3LENH: 0x38;
TLB4LENH: 0x3E; TLB5LENH: 0x44; TLB6LENH: 0x4A; TLB7LENH: 0x50
Bits 7–0: TLBnLENL: TLBn Packet Length Low Byte
Low byte of the packet length for the packet associated with TLBn.
Register 52. TLBnADDRH: TLBn Packet Address High Byte
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Note:
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
The contents of this register are invalid following a buffer overflow event.
Address: TLB0ADDRH: 0x27; TLB1ADDRH: 0x2D; TLB2ADDRH: 0x33; TLB3ADDRH: 0x39;
TLB4ADDRH: 0x3F; TLB5ADDRH: 0x45; TLB6ADDRH: 0x4B; TLB7ADDRH: 0x51
Bits 7–0: TLBnADDRH: TLBn Packet Address High Byte
High byte of the packet starting address for the packet associated with TLBn.
Register 53. TLBnADDRL: TLBn Packet Address Low Byte
R
R
R
R
R
R
R
R
Reset Value
00000000
Bit7
Note:
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
The contents of this register are invalid following a buffer overflow event.
Address: TLB0ADDRH: 0x28; TLB1ADDRH: 0x2E; TLB2ADDRH: 0x34; TLB3ADDRH: 0x3A;
TLB4ADDRH: 0x40; TLB5ADDRH: 0x46; TLB6ADDRH: 0x4C; TLB7ADDRH: 0x52
Bits 7–0: TLBnADDRL: TLBn Packet Address Low Byte
Low byte of the packet starting address for the packet associated with TLBn.
70
Rev. 1.0
CP2200/1
Register 54. RXFIFOHEADH: Receive FIFO Head Pointer High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x17
Bits 7–0: RXFIFOHEADH: Receive FIFO Head Pointer High Byte
High byte of the receive FIFO buffer head pointer.
Register 55. RXFIFOHEADL: Receive FIFO Head Pointer Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x18
Bits 7–0: RXFIFOHEADL: Receive FIFO Head Pointer Low Byte
Low byte of the receive FIFO buffer head pointer.
Register 56. RXFIFOTAILH: Receive FIFO Tail Pointer High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x15
Bits 7–0: RXFIFOTAILH: Receive FIFO Tail Pointer High Byte
High byte of the receive FIFO buffer tail pointer.
Register 57. RXFIFOTAILL: Receive FIFO Tail Pointer Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x16
Bits 7–0: RXFIFOTAILL: Receive FIFO Tail Pointer Low Byte
Low byte of the receive FIFO buffer tail pointer.
Rev. 1.0
71
CP2200/1
Register 58. RXFIFOSTA: Receive FIFO Status Register
R/W
R/W
R/W
R/W
R/W
R/W
—
—
—
—
—
—
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
R/W
R/W
Reset Value
FIFOSTA1 FIFOSTA0 00000000
Bit1
Bit0
Address:
0x5B
This register is set by hardware and is valid after an RX FIFO Full Interrupt is generated or
if TLBVALID equals 0xFF.
Bits 7–2: UNUSED. Read = 000000b, Write = don’t care.
Bits 1–0: FIFOSTA[1:0]: Receive FIFO Status
00: Initial Value—No information.
01: The last packet successfully received used all available free space in the buffer.
10: The last packet successfully received was the 8th packet in the receive buffer. There is free
space remaining in the receive buffer; however, the maximum number of packets in the buffer has
been reached. Any future packets received will cause overflow.
Note: Receiving an unsuccessful 9th packet will cause overflow.
11: The last packet successfully received was the eighth packet in the receive buffer and used all
available free space in the buffer.
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Rev. 1.0
CP2200/1
13. Flash Memory
The CP2200/1 has 8 kB of on-chip non-volatile Flash memory fully accessible by the host processor. The last six
bytes of this memory space (addresses 0x1FFA to 0x1FFF) are factory preprogrammed and contain a unique 48bit MAC Address (Individual Address) registered with the IEEE Registration Authority. The most significant byte of
the MAC address is at 0x1FFA, and the least significant byte is at 0x1FFF. The last page of Flash containing the
MAC address is erasable, and the user should exercise caution to prevent erasing the MAC Address.
13.1. Programming the Flash Memory
The Flash memory can be programmed one byte at a time through the parallel host interface. Once cleared to a
logic 0, a Flash bit must be erased to set it back to logic 1. A Flash bit may always be changed from logic 1 to
logic 0, as long as Flash bytes are only written once between erase cycles. Flash erase operations erase an entire
512 byte sector at a time. Flash write and erase operations are automatically timed by hardware and do not affect
the parallel host interface. After initiating a Flash write or erase operation, the host CPU can continue to access the
CP2200/1 through the parallel host interface while the Flash operation is taking place. The host is notified with an
interrupt request when the Flash write or erase operation is complete. Refer to Table 18 for complete Flash
memory electrical characteristics including typical write and erase cycle times.
The Flash memory can be written and erased using the FLASHADDRH:FLASHADDRL, FLASHDATA, and
FLASHERASE registers. Once a Flash operation is initiated, the status can be monitored using the FLASHSTA
register, or the host can wait for notification by the interrupt signal.
13.1.1. Flash Lock and Key Protection
The Flash memory is protected from errant write and erase operations by a lock and key function. Flash reads are
unrestricted. The Flash Lock and Key Register (FLASHKEY) must be written with the correct key codes, in
sequence, before each Flash write or erase operation. If a Flash write or erase operation is attempted without first
writing the correct key codes to the FLASHKEY register, Flash cannot be written or erased until the next reset.
After programming Flash, the CP2200/1 should be reset in order to protect the device from errant Flash operations.
The key codes for unlocking the CP2200/1 are 0xA5 and 0xF1. These codes must be written in sequence to the
FLASHKEY register prior to each Flash write or erase operation. Note: To ensure the integrity of Flash
contents, the on-chip VDD Monitor should not be disabled while the Flash memory is unlocked.
13.1.2. Flash Erase Procedure
Step 1: Write 0xA5 followed by 0xF1 to FLASHKEY.
Step 2: Set FLASHADDRH:FLASHADDRL to any address within the 512-byte page to be erased.
Step 3: Write the value 0x01 to FLASHERASE.
Step 4: Check FLASHSTA to determine when the Flash operation is complete. The Flash Write/Erase
Completed interrupt can also be use to determine when the operation completes.
13.1.3. Flash Write Procedure
Step 1: Write 0xA5 followed by 0xF1 to FLASHKEY.
Step 2: If the byte to be written is not 0xFF, then erase the page containing the byte.
Step 3: Set FLASHADDRH:FLASHADDRL to the address of the byte to be written.
Step 4: Write the value to be written to the FLASHDATA register.
Step 5: Check FLASHSTA to determine when the Flash operation is complete. The Flash Write/Erase
Completed interrupt can also be used to determine when the operation is complete.
Rev. 1.0
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CP2200/1
13.2. Reading the Flash Memory
Flash reads occur much faster than Flash write or erase operations and are completed within the minimum read
strobe time specified by the parallel host interface. Flash is read using the FLASHADDRH:FLASHADDRL,
FLASHDATA, and FLASHAUTORD registers. The FLASHAUTORD register provides an efficient method of
accessing sequential data in Flash by automatically incrementing the Flash address pointer after each read.
13.2.1. Flash Read Procedure
Step 1: Set FLASHADDRH:FLASHADDRL to the address of the byte to be read.
Step 2: Read the value of the byte from FLASHDATA.
13.2.2. Multiple Byte Flash Read Procedure
Step 1: Set FLASHADDRH:FLASHADDRL to the address of the first byte to be read.
Step 2: For each byte, read the value from FLASHAUTORD.
Table 18. Flash Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
Min
Typ
Max
Units
Flash Size
8192
—
—
bytes
Endurance
20k
100k
—
Erase/
Write
Erase Cycle Time
—
11
—
ms
Write Cycle Time
40
55
70
µs
74
Conditions
Rev. 1.0
CP2200/1
13.3. Flash Access Registers
The CP2200 Flash is accessed through the registers in Table 17. See the register tables following Table 17 for
detailed register descriptions
Table 19. Flash Access Register Summary
Register
Long Name
Address
Description
FLASHSTA
Flash Status
0x7B
Used to determine the status of a Flash write
or erase operation.
FLASHKEY
Flash Lock and Key
0x67
Write-only register allowing the host to
unlock the Flash for writing or erasing.
FLASHADDRH
FLASHADDRL
Flash Address Register High and
Low Bytes
0x69
0x68
16-bit Address used for Flash operations.
FLASHDATA
Flash Read/Write Data Register
0x06
Data register used for writing or reading a
single byte of Flash.
FLASHAUTORD Flash AutoRead Data Register
0x05
Data register used for reading a block of
sequential data stored in Flash. Each read
from this register increments the Flash
address register by 1.
FLASHERASE
0x6A
Initiates a Flash erase operation.
Flash Erase
Register 59. FLASHSTA: Flash Status Register
R/W
R/W
R/W
R/W
—
—
—
—
Bit7
Bit6
Bit5
Bit4
R
R
R
R
Reset Value
FLBUSY Reserved FLWRITE FLERASE 00000000
Bit3
Bit2
Bit1
Bit0
Address:
0x7B
Note: To determine when a Flash operation completes, the FLBUSY bit should be polled or software should
wait for the Flash Write/Erase Operation Complete Interrupt to occur.
Bits 7–4: UNUSED. Read = 0000b, Write = don’t care.
Bit 3:
FLBUSY: FLASH Busy Indicator
This bit indicates when a FLASH write or erase operation is in progress.
0: FLASH is idle.
1: FLASH write/erase operation is currently in progress.
Bit 2:
Reserved.
Bit 1:
FLWRITE: FLASH Write
0: The last Flash operation completed was not a Flash write.
1: The last Flash operation completed was a Flash write.
Bit 0:
FLERASE: FLASH Erase
0: The last Flash operation completed was not a Flash erase.
1: The last Flash operation completed was a Flash erase.
Rev. 1.0
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CP2200/1
Register 60. FLASHKEY: FLASH Lock and Key Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x67
Bits 7-0: FLKEY: Flash Lock and Key Register
This register must be written to unlock the Flash for writing or erasing. To unlock the Flash, first write
0xA5 and then 0xF1 to this register. The VDD Monitor should not be disabled while the Flash is
unlocked. The device must be unlocked prior to each Flash write/erase operation.
Register 61. FLASHADDRH: FLASH Address Register High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x69
Bits7–0: FLASHADDRH: Flash Address Register High Byte
Holds the most significant eight bits of the target FLASH address.
Register 62. FLASHADDRL: FLASH Address Register Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x68
Bits7–0: FLASHADDRL: Flash Address Register Low Byte
Holds the least significant eight bits of the target FLASH address.
76
Rev. 1.0
CP2200/1
Register 63. FLASHDATA: FLASH Read/Write Data Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x06
Bits7–0: FLASHDATA: Flash Read/Write Data Register
Read:
Value of the Flash byte at the location specified by FLASHADDRH:FLASHADDRL.
Write:
Initiates a Flash write operation to the Flash byte at the address in FLASHADDRH:FLASHADDRL.
The Flash memory must be unlocked, and the target Flash byte should have a value of 0xFF (value
of erased Flash).
Register 64. FLASHAUTORD: FLASH AutoRead Data Register
R
R
R
R
R
R
R
R
Bit7
Bit6
Bit5
Bit4
B
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x05
Bits7–0: FLASHAUTORD: Flash AutoRead Data Register
Reads from this register return the value of the Flash byte at the location specified by the Flash
Address Register. The Flash Address Register is automatically incremented by 1 after the read.
Register 65. FLASHERASE: FLASH Erase Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
—
—
—
—
—
—
Reserved
FLEGO
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x6A
Bits 7–2: UNUSED. Read = 000000b, Write = don’t care.
Bit 1:
Reserved. Must write 0b.
Bit 0:
FLEGO: Flash Erase Start.
Writing a ‘1’ to this bit initiates a Flash erase operation on the 512-byte page of Flash containing the
Flash byte at the location specified in the Flash Address Register. The Flash memory must be
unlocked prior to starting a Flash erase operation.
Rev. 1.0
77
CP2200/1
14. Media Access Controller (MAC)
The CP2200/1 has an IEEE 802.3 compliant Ethernet Media Access Controller (MAC). The MAC can be
configured to automatically pad short frames (full duplex mode only), append CRC, and perform frame length
checking. A loopback mode separate from PHY loopback is also provided for system debugging. The MAC is
configured through nine indirect 16-bit registers summarized in Table 20.
14.1. Initializing the MAC
MAC initialization occurs after the physical layer initialization and typically occurs once after each reset or AutoNegotiation Complete interrupt. Most MAC indirect registers can be left at their reset values. See “6.2. Reset
Initialization” on page 18 for the complete reset initialization procedure. The following are the steps required to
initialize the MAC:
Step 1: Determine if the physical layer is set to full-duplex or half-duplex. The MAC must be set to the same
duplex mode as the physical layer before sending or receiving any packets.
Step 2: Write 0x40B3 (full-duplex) or 0x4012 (half-duplex) to MACCF. The appropriate bits in this register
may also be set or cleared to change padding options or MAC behavior.
Step 3: Write 0x0015 (full-duplex) or 0x0012 (half-duplex) to IPGT.
Step 4: Write 0x0C12 to IPGR.
Step 5: Write 0x05EE to MAXLEN.
Step 6: Program the 48-bit Ethernet MAC Address by writing to MACAD0:MACAD1:MACAD2.
Step 7: Write 0x0001 to MACCN to enable reception. If loopback mode or flow control is desired, set the
appropriate bits to enable these functions.
14.2. Accessing the Indirect MAC Registers
The indirect MAC registers are accessed through four direct mapped registers: MACADDR, MACDATAH,
MACDATAL, and MACRW. The MAC registers can be accessed using the following procedure:
Step 1: Write the address of the indirect register to MACADDR.
Step 2: If writing a value to the indirect register, write a 16-bit value to MACDATAH:MACDATAL.
Step 3: Write any value to MACRW to transfer the contents of MACDATAH:MACDATAL to the indirect
register.
Step 4: Perform a read on MACRW to transfer the contents of the indirect register to
MACDATAH:MACDATAL. The MACDATAH and MACDATAL registers may now be directly read to
determine the contents of the indirect register.
78
Rev. 1.0
CP2200/1
Register 66. MACADDR: MAC Indirect Address
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x0A
Bits 7–0: MACADDR: MAC Indirect Address
Indirect MAC register address targeted by reads/writes to MACRW.
Register 67. MACDATAH: MAC Data High Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x0B
Bits 7–0: MAC Data High Byte
Holds the most significant 8-bits of data read or written to an indirect MAC register.
Register 68. MACDATAL: MAC Data Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x0C
Bits 7–0: MAC Data Low Byte
Holds the least significant 8-bits of data read or written to an indirect MAC register.
Register 69. MACRW: MAC Read/Write Initiate
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Reset Value
00000000
Address:
0x0D
Bits 7–0: MAC Read/Write Initiate
Initiates a read or write to the indirect MAC register at the address stored in MACADDR.
Write: The contents of MACDATAH:MACDATAL are transferred to the target MAC register.
Read: The contents of the target MAC register are transferred to MACDATAH:MACDATAL.
Rev. 1.0
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CP2200/1
14.3. Indirect MAC Register Descriptions
The MAC is configured through nine indirect 16-bit registers listed in Table 20. See the figures following Table 20
for detailed register descriptions.
Table 20. Indirect MAC Register Summary
80
Register
Long Name
Address
Description
MACCN
MAC Control
0x00
Used to enable reception and other options.
MACCF
MAC Configuration
0x01
Used to configure padding options and other
settings.
IPGT
Back-to-Back Interpacket Delay
0x02
Sets the Back-to-Back Interpacket Delay.
IPGR
Non-Back-to-Back Interpacket
Delay
0x03
Sets the Non-Back-to-Back Interpacket
Delay.
CWMAXR
Collision Window and Maximum
Retransmit
0x04
Sets the collision window size and the maximum number of retransmits allowed.
MAXLEN
Maximum Frame Length
0x05
Sets the maximum receive frame length.
MACAD0
MACAD1
MACAD2
MAC Address
0x10
0x11
0x12
Sets the MAC address of the local device.
Rev. 1.0
CP2200/1
Indirect Register 1. MACCN: MAC Control Register
R/W
R/W
R/W
R/W
R/W
Bit14
Bit13
Bit12
Bit11
R/W
R/W
Reserved RANDRST
Bit15
R/W
Bit6
R/W
R/W
Bit9
Bit8
Reserved
Reserved
Bit7
R/W
R/W
R/W
Bit10
R/W
R/W
LOOPBCK TXPAUSE RXPAUSE Reserved
Bit5
Bit4
Bit3
Bit2
Bit1
R/W
Default Value
RCVEN
0x8000
Bit0
MACADDR:
0x00
Bit 15:
Bit 14:
Reserved. Read = varies; Must write 0b.
RANDRST: Random Number Generator Reset
Writing a ‘1’ to this bit resets the random number generator within the transmit function.
Bits 13–5:Reserved. Read = varies; Must write 000000000b.
Bit 4:
LOOPBCK: Loopback Mode Enable Bit
Note: MAC Loopback Mode is independent of the physical layer loopback mode.
0: Normal operation.
1: MAC transmit data is internally looped back as MAC receive data.
Bit 3:
TXPAUSE: TX Flow Control Enable Bit (Full-Duplex Only)
0: PAUSE control frames are blocked.
1: PAUSE control frames are allowed to pass through the MAC.
Bit 2:
RXPAUSE: RX Flow Control Enable Bit (Full-Duplex Only)
0: PAUSE control frames received from the physical layer are ignored.
1: PAUSE control frames received from the physical layer are acted upon.
Bit 1:
Reserved. Read = 0; Must write 0b.
Bit 0:
RCVEN: Receive Enable
0: The MAC blocks control frames from reaching the receive interface. The MAC blocks all received
packets from the receive interface.
1: The MAC allows received packets to reach the receive interface.
Rev. 1.0
81
CP2200/1
Indirect Register 2. MACCF: MAC Configuration Register
R/W
R/W
Reserved ABORTD
R/W
R/W
EBBPD
EBD
R/W
R/W
Reserved
R/W
R/W
RLPRE
PUREPRE
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PADMD1 PADMD0
Bit7
Bit6
PADEN
Bit5
CRCEN PHEADER Reserved LENCHK FLLDPLX
Bit4
Bit3
Bit2
Bit1
Bit0
Default Value
0x0000
MACADDR:
0x01
Bit 15:
Bit 14:
Reserved. Read = 0b; Must write 0b.
ABORTD: Abort Disable Bit
0: MAC will abort when excessive delay is detected and update the transmit status vector.
1: MAC will attempt to transmit indefinitely as specified in IEEE 802.3.
Bit 13:
EBBPD: Exponential Backoff after Back Pressure Disable Bit (Half-Duplex Only)
0: After incidentally causing a collision during back pressure, the MAC will use the exponential
backoff algorithm as specified in IEEE 802.3.
1: After incidentally causing a collision during back pressure, the MAC will immediately transmit
without using the exponential backoff algorithm.
Bit 12:
EBD: Exponential Backoff Disable (Half-Duplex Only)
0: MAC will use the exponential backoff algorithm as specified in IEEE 802.3.
1: MAC will immediately retransmit following a collision.
Bits 11–10:Reserved. Read = 00b; Write = don’t care.
Bit 9:
RLPRE: Reject Long Preamble
0: MAC allows any length preamble as specified in IEEE 802.3.
1: MAC rejects packets with a preamble greater than 12 bytes in length.
Bit 8:
PUREPRE: Pure Preamble Enforcement
0: No preamble checking is performed.
1: MAC will verify the content of the preamble to ensure it contains 0x55 and is error-free. Packets
with an invalid preamble will be rejected.
Bit 7–6: PADMD[1:0]: Pad Mode
Note: This bit field is ignored if PADEN is cleared to ‘0’. See Table 21 for a complete description.
Bit 5:
PADEN: Pad Enable Bit (must be set to 0 in half-duplex operation)
Note: See Table 21 for a complete description.
Bit 4:
CRCEN: CRC Enable Bit
Note: This bit must be set to ‘1’ if padding is enabled.
0: CRC will not be appended. Frames presented to the MAC must contain CRC.
1: CRC will be appended.
82
Rev. 1.0
CP2200/1
Indirect Register 2. MACCF: MAC Configuration Register (Continued)
Table 21. Pad Operation
PADMD1[7] PADMD0[6] PADEN[5] CRCEN[4]
Bit 3:
Bit 2:
Bit 1:
Bit 0:
Action
x
x
0
0
No padding added on transmitted packets,
check CRC
x
x
0
1
No padding added on transmitted packets,
append CRC
0
0
1
1
Pad short frames to 60 bytes, append CRC
x
1
1
1
Pad short frames to 64 bytes, append CRC
1
0
1
1
Auto Detect Tagged VLAN Frames
(IEEE802.1q)
If untagged: Pad to 60 bytes, append CRC
If tagged: Pad to 64 bytes, append CRC
PHEADER: Proprietary Header Select Bit
0: No proprietary header exists on the front of IEEE 802.3 frames.
1: Four bytes of proprietary header information exist on the front of IEEE 802.3 frames. These bytes
will be ignored by the CRC function.
Reserved. Read = 0b; Must write 0b.
LENCHK: Frame Length Checking Enable Bit
0: Frame length checking is disabled.
1: Transmit and receive frame lengths are compared to the Length/Type field. If the Length/Type
field represents a length then the check is performed. Mismatches are reported in the Transmit/
Receive status vectors.
FLLDPLX: Full-Duplex Mode Enable Bit
0: MAC operates in half-duplex mode.
1: MAC operates in full-duplex mode.
Rev. 1.0
83
CP2200/1
Indirect Register 3. IPGT: Back-to-Back Inter-Packet Gap Register
R/W
R/W
R/W
R/W
Bit15
Bit14
Bit13
Bit12
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
Reserved
Reserved
Bit7
IPGT
Bit6
Bit5
Bit4
Bit3
Default Value
0x0000
Bit2
Bit1
Bit0
MACADDR:
0x02
Bits 15–7:Reserved. Read = 000000000b; Must write 000000000b.
Bits 6–0: IPGT: Back-to-Back Inter-Packet Gap Register
Sets the minimum delay between the end of any transmitted packet and the start of a new packet.
In Full-Duplex mode, the register value should be set to the desired number of time units (each time
unit is 0.46 µs) minus 3. The recommended setting is 0x15 (21d), which yields 9.6 µs.
In Half-Duplex mode, the register value should be set to the desired number of time units (each time
unit is 0.46 µs) minus 6. The recommended setting is 0x12 (18d), which yields 9.6 µs.
Indirect Register 4. IPGR: Non-Back-to-Back Inter-Packet Gap Register
R/W
R/W
R/W
R/W
Reserved
R/W
R/W
R/W
R/W
IPGR1
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default Value
Bit6
Bit5
Bit4
Bit2
Bit1
Bit0
MACADDR:
Reserved
Bit7
IPGR2
Bit3
0x0000
0x03
Bit 15:
Reserved. Read = 0b; Must write 0b.
Bits 14–8:IPGR1: Non-Back-to-Back Inter-Packet Gap Part 1
Sets the optional carrier sense window referenced in IEEE 802.3 Section 4.2.3.2.1. The range of
values for this bit field are 0x00 to IPGR2. The recommended value is 0x0C.
Bit 7:
Reserved. Read = 0b; Must write 0b.
Bits 6–0: IPGR2: Non-Back-to-Back Inter-Packet Gap Part 2
Sets the Non-Back-to-Back Inter-Packet Gap. The recommended value is 0x12, which represents a
minimum inter-packet gap of 9.6 µs.
84
Rev. 1.0
CP2200/1
Indirect Register 5. CWMAXR: Collision Window and Maximum Retransmit Register
R/W
R/W
R/W
R/W
R/W
Reserved
R/W
R/W
R/W
Bit9
Bit8
R/W
R/W
Default Value
Bit1
Bit0
MACADDR:
CW
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
R/W
R/W
R/W
R/W
R/W
R/W
Reserved
Bit7
Bit6
Bit5
MAXR
Bit4
Bit3
Bit2
0x370F
0x04
Note: This register does not require initialization and will be left at its reset value by most systems.
Bits 15–14:Reserved. Read = 00b; Must write 00b.
Bits 13–8:CW: Collision Window
Sets the collision window in which collisions occur in a properly configured network.
The collision window is specified in the number of bytes from the start of transmission. The preamble and frame delimiter are included in the byte count. Its default of 0x37 corresponds to the count
of frame bytes at the end of the window.
Bits 7–4: Reserved. Read = 0000b; Must write 0000b.
Bits 3–0: MAXR: Maximum Retransmit Attempts
Sets the maximum number of retransmit attempts following a collision before aborting the packet
due to excessive collisions. IEEE 802.3 specifies a maximum value of 0x0F (15d).
Indirect Register 6. MAXLEN: Maximum Frame Length Register
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default Value
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
MACADDR:
0x0600
0x05
Note: This register does not require initialization and will be left at its reset value will be set to 1518 (0x05EE)
by most systems.
Bits 15–0:MAXF: Maximum Frame Length
Specifies the maximum length of a receive frame. The default value is 0x600 (1536 octets). This
register should be programmed if a shorter maximum length restriction is desired. Examples of
shorter frame lengths are untagged (1518 octets) and tagged (1522 octets). If a proprietary header
is allowed, this field should be adjusted accordingly.
Rev. 1.0
85
CP2200/1
Indirect Register 7. MACAD0: MAC Address 0
R/W
R/W
R/W
R/W
Bit15
Bit14
Bit13
Bit12
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
Default Value
Bit2
Bit1
Bit0
MACADDR:
OCTET6
OCTET5
Bit7
Bit6
Bit5
Bit4
0x0000
Bit3
0x10
Bits 15–8:OCTET6: MAC Address, 6th Octet
This field holds the sixth (least significant) octet of the MAC address.
Bits 7–0: OCTET5: MAC Address, 5th Octet
This field holds the fifth octet of the MAC address.
Indirect Register 8. MACAD1: MAC Address 1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
OCTET4
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default Value
Bit2
Bit1
Bit0
MACADDR:
OCTET3
Bit7
Bit6
Bit5
Bit4
0x0000
Bit3
0x11
Bits 15–8:OCTET4: MAC Address, 4th Octet
This field holds the fourth octet of the MAC address.
Bits 7–0: OCTET3: MAC Address, 3rd Octet
This field holds the third octet of the MAC address.
86
Rev. 1.0
CP2200/1
Indirect Register 9. MACAD2: MAC Address 2
R/W
R/W
R/W
R/W
Bit15
Bit14
Bit13
Bit12
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit11
Bit10
Bit9
Bit8
R/W
R/W
R/W
R/W
OCTET2
OCTET1
Bit7
Bit6
Bit5
Bit4
Default Value
0x0000
Bit3
Bit2
Bit1
Bit0
MACADDR:
0x12
Bits 15–8:OCTET2: MAC Address, 2nd Octet
This field holds the second octet of the MAC address.
Bits 7–0: OCTET1: MAC Address, first Octet
This field holds the first (most significant) octet of the MAC address.
Rev. 1.0
87
CP2200/1
15. Physical Layer (PHY)
The CP2200/1 has an IEEE 802.3 compliant 10 BASE-T Ethernet physical layer transceiver that includes a
receiver, transmitter, auto-negotiation, loopback, jabber, smart squelch, polarity correction, and link integrity
functions. If enabled, the auto-negotiation function automatically negotiates the speed of the data link and the
duplex mode. Both half-duplex and full-duplex modes are supported.
The physical layer is controlled and monitored through three registers: PHYCN, PHYCF, and PHYSTA. The various
functions and test modes that can be enabled and monitored through these registers are explained in the following
sections.
15.1. Auto-Negotiation and Duplex Mode
Auto-negotiation allows the CP2200/1 to be connected to any 10/100/1000 BASE-T Ethernet network and
advertise its capabilities. Auto-negotiation uses a series of fast link pulses to send 16-bit link code words. Many
conditions (e.g., failure to detect fast link pulses) can cause auto-negotiation to fail. On failure, the Auto-Negotiation
Failed interrupt will be generated, and/or the Auto-Negotiation Complete Interrupt will not be generated. The
PHYSTA status register will indicate the cause of failure, and the physical layer will default to half-duplex mode. On
success, the Auto-Negotiation Complete interrupt will be generated, and the Auto-Negotiation Failed interrupt will
not be generated. Both interrupts must be checked to ensure that Auto-Negotiation has succeeded.
The advertised link speed will always be 10BASE-T. The duplex mode (half or full) will be negotiated, and full
duplex will be selected if supported by the network. Full duplex mode allows the physical layer to send and receive
data at the same time. In half duplex mode, data can only be transmitted or received at any given time. Full duplex
mode provides overall higher performance and reduces collisions. Software may also choose to advertise its ability
to send and receive PAUSE control packets by setting ADPAUSE (PHYCF.2) to ‘1’.
Important Note: When using auto-negotiation, the auto-negotiation enable bit AUTONEG (PHYCF.4) must
be set to ‘1’ prior to enabling the physical layer. To restart auto-negotiation, the physical layer (transmitter,
receiver, or both) must be disabled and reenabled.
Important Note: The CP220x supports legacy link partners that cannot auto-negotiate. If the link partner cannot
autonegotiate, then the physical layer will default to half-duplex mode.
15.2. Auto-Negotiation Synchronization
The CP220x implements an autonegotiation scheme where autonegotiation is attempted for 250 ms, then a breaklink delay of 1.5 seconds is inserted between auto-negotiation attempts. When the break-link delay is active, the
CP220x does not listen for incoming auto-negotiation requests and does not attempt to auto-negotiate. If one
device starts autonegotiation while the other device is in its “break-link period”, the autonegotiation attempt will fail.
If the devices are unsyncronized, this can lead to a situation where each device attempts to autonegotiate in the
other device’s “break-link period”. This can be solved by synchronizing one or both devices using the following
procedure:
Step 1: Disable the physical layer by writing 0x00 to the PHYCN register.
Step 2: Enable the physical layer with link integrity test and auto-negotiation turned off.
1.Disable the transmitter power save mode (TXPWR = 0x80) and set physical layer options
(PHYCF = SMSQ | JABBER | ADPAUSE | AUTOPOL).
2.Enable the physical layer (PHYEN = 1).
3.Wait for the physical layer to power up. See Physical Layer Startup Time in Table 22 on page 93.
4.Enable the transmitter and receiver (TXEN = 1 and RXEN = 1).
Step 3: Poll the Wake-on-LAN interrupt flag (WAKEINT) to detect if a link partner is present.
1.If there is a signal, wait 250 ms then begin autonegotiation.
2.If there is no signal, wait 1.5 seconds then begin autonegotiation.
88
Rev. 1.0
CP2200/1
15.3. Loopback Mode
Loopback Mode provides the ability to transfer data from the physical layer’s output directly to it’s input to aid in
system debugging. When PHYCN.3 is set to ‘1’, transmit data is looped back to the receiver via an internal analog
path. The transmit drivers and receive input circuitry are bypassed, isolating the device from the network. This
prevents network traffic from affecting the result of any system self-tests and guarantees a collision-free
environment.
15.4. Link Integrity Function
The Link Integrity function provides the ability to detect and respond to a 10 BASE-T link failure. When such a
failure is detected, the transmitter and receiver are automatically disabled, and the state of the link is reported in
LINKSTA (PHYCN.0). The host can disable the link integrity function by clearing LINKINT (PHYCF.6) to ‘0’. When
the link integrity function is disabled, the physical layer will operate regardless of the presence of link pulses.
15.5. Receiver Smart Squelch and Automatic Polarity Correction
The physical layer receiver can detect and correct for noise or incorrect polarity of the received signal. If the
receiver Smart Squelch feature is enabled by setting SMSQ (PHYCF.7) to ‘1’, the receiver circuitry performs a
combination of amplitude and timing measurements (in accordance with IEEE 802.3) to determine the validity of
received data. This prevents noise from falsely triggering the receiver in the absence of valid data.
Automatic polarity correction can automatically detect and correct the polarity of the received data to compensate
for a wiring error at either end of the 10 BASE-T cable. When automatic polarity correction is enabled by setting
AUTOPOL (PHYCF.1) to ‘1’, the polarity of the receive data is indicated in POLREV (PHYCN.1). When automatic
polarity detection is disabled, the polarity of the receive data can be manually reversed by setting REVPOL
(PHYCF.0) to ‘1’.
15.6. Transmitter Jabber Function
Provides the ability to automatically disable the transmitter if software attempts to transmit a packet longer than the
maximum allowed packet length (per IEEE 802.3). The host processor will be notified via the Jabber Detected
Interrupt if a jabber condition is automatically handled by the hardware. Enabling the jabber function is
recommended to ensure that the embedded system using the CP2200/1 for Ethernet communication does not
generate a jabber condition on the wire.
Rev. 1.0
89
CP2200/1
15.7. Initializing the Physical Layer
The physical layer should be configured to the desired mode prior to setting the enable bit PHYEN (PHYCN.7). The
following procedure should be used to initialize the physical layer:
Step 1: If auto-negotiation is used, implement the synchronization procedure in Section 15.2 on page 88.
Step 2: Disable the physical layer by writing 0x00 to the PHYCN register.
Step 3: Configure Desired Options using the PHYCN and PHYCF registers:
1.Specify the Duplex Mode or enable Auto-Negotiation.
2.Enable or Disable Loopback Mode.
3.Disable the transmitter power save mode (TXPWR = 0x80).
4.Enable the desired functions such as Receiver Smart Squelch, Automatic Polarity Correction, Link
Integrity, Jabber Protection, and PAUSE packet capability advertisement.
5.If Automatic Polarity Correction is disabled, manually set the desired polarity.
Step 4: Enable the physical layer:
1.Enable the physical layer (PHYEN = 1).
2.Wait for the physical layer to power up. See Physical Layer Startup Time in Table 22 on page 93.
3.Enable the transmitter and receiver (TXEN = 1 and RXEN = 1).
Step 5: Wait for auto-negotiation to complete. If auto-negotiation is not enabled, software may wait for a valid
link or go directly to MAC Initialization.
Step 6: Enable the desired Activity, Link, or Activity/Link LEDs using the Register 15, “IOPWR: Port Input/
Output Power Register,” on page 45.
Step 7: Initialize the MAC to the same duplex mode reported by the physical layer in the PHYCN register.
Note: Step 6 and Step 7 are repeated in the reset initialization procedure. Software only needs to perform these steps once.
90
Rev. 1.0
CP2200/1
Register 70. PHYCN: Physical Layer Control Register
R/W
R/W
R/W
R/W or RO
R/W
R
R
R
Reset Value
PHYEN
TXEN
RXEN
DPLXMD
LBMD
LPRFAULT
POLREV
LINKSTA
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x78
Important Note: When using auto-negotiation, the auto-negotiation enable bit, AUTONEG (PHYCF.4), must
be set to “1” prior to setting PHYEN, TXEN, and RXEN to 1. To restart auto-negotiation,
clear one of the three enable bits (PHYEN, TXEN, and RXEN) to “0” then set it back to “1”.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
PHYEN: Physical Layer Enable
0: The physical layer is placed in a low-power state with limited functionality.
1: The physical layer is placed in a normal power state and is fully functional.
TXEN: Transmitter Enable
0: Physical Layer’s transmitter is placed in a low-power state. Packet transmission and Link Pulse
Generation Functions are disabled.
1. Physical layer’s transmitter is enabled.
RXEN: Receiver Enable
0: Physical layer’s receiver is placed in a low-power state. Packet reception is disabled.
1: Physical layer’s receiver is enabled.
DPLXMD: Full-duplex Mode Enable Bit
Note: This bit is read-only when Auto-Negotiation is enabled.
0: Half-duplex mode is selected.
1: Full-duplex mode is selected.
LBMD: Loopback Mode Enable Bit
Note: Loopback mode is automatically disabled if a jabber condition is detected.
0: Loopback mode is disabled.
1: Loopback mode is enabled.
LPRFAULT: Link Partner Remote Fault (Local Fault) Indicator
0: Normal operation.
1: The link partner has detected a link fault and has sent notification during auto-negotiation. This
condition can occur if the local transmitter is disabled and link pulses are no longer generated.
POLREV: Polarity Reversed Indicator
0: Incorrect link polarity has not been detected.
1: Incorrect link polarity detected. Link polarity has been automatically reversed.
LINKSTA: Link Status Indicator
0: Link is bad.
1: Link is good.
Rev. 1.0
91
CP2200/1
Register 71. PHYCF: Physical Layer Configuration Register
R/W
SMSQ
Bit7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
LINKINTG JABBER AUTONEG Reserved ADPAUSE AUTOPOL REVPOL 00000000
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x79
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
92
SMSQ: Receiver Smart Squelch Enable Bit
0: Receiver Smart Squelch is disabled.
1: Receiver Smart Squelch is enabled.
LINKINT: Link Integrity Function Enable Bit
Note: When enabled, the link integrity function will automatically disable the transmitter and receiver
and update LINKSTA (PHYCN.0) if a link failure is detected.
0: Link integrity function is disabled.
1. Link integrity function is enabled.
JABBER: Jabber Protection Function Enable Bit
Note: When enabled, the jabber protection function will automatically disable loopback mode if a
jabber condition is detected.
0: Jabber protection function is disabled.
1: Jabber protection function is enabled.
AUTONEG: Auto-Negotiation Enable Bit
0: Auto-Negotiation function is disabled.
1: Auto-Negotiation function is enabled.
Reserved. Read = 0b; Must write 0b.
ADPAUSE: Advertise Pause Packet Capability
0: Indicates (during auto-negotiation) that the CP2200/01 does not have pause packet capability.
1: Indicates (during auto-negotiation) that the CP2200/01 does have pause packet capability.
AUTOPOL: Automatic Polarity Correction Enable Bit
0: Automatic receiver polarity correction is disabled.
1: Automatic receiver polarity correction is enabled.
REVPOL: Polarity Reversal Bit
Note: This bit is ignored if Automatic Polarity Correction is enabled.
0: The receiver polarity is normal.
1: The receiver polarity is reversed.
Rev. 1.0
CP2200/1
Register 72. PHYSTA: Physical Layer Status Register
R
R
R
LGCILF
LGCLSF
AKDLF
Bit7
Bit6
Bit5
R
R
AKDAMF AKDCMF
Bit4
R
ABDLF
Bit3
R
R
Reset Value
ABDAKMF ABDABMF 00000000
Bit2
Bit1
Bit0
Address:
0x80
Note: The Auto-Negotiation states and error types are described in Clause 28 of IEEE 802.3.
Bit 7:
Bit 6:
Bit 5:
Bit 4:
Bit 3:
Bit 2:
Bit 1:
Bit 0:
LGCILF: Link Good Check Incompatible Link Failure
0: Normal operation.
1: Auto-negotiation failed due to an incompatible link.
LGCLSF: Link Good Check Line Status Failure
0: Normal operation.
1. Auto-negotiation failed due to a link fault.
AKDLF: Acknowledge Detect Link Failure
0: Normal operation.
1: Auto-negotiation failed due to lack of reception of fast link pulses.
AKDAMF: Acknowledge Detect Acknowledge Match Failure
0: Normal operation.
1: Auto-negotiation failed due to reception of a link code word with the ACK bit cleared.
AKDCMF: Acknowledge Detect Consistency Match Failure
0: Normal operation.
1: Auto-negotiation failed due to reception of inconsistent link code words.
ABDLF: Ability Detect Link Failure
0: Normal operation.
1: Auto-negotiation failed due to lack of reception of fast link pulses.
ABDAKMF: Ability Detect Acknowledge Match Failure
0: Normal operation.
1: Auto-negotiation failed due to the reception of link code word(s) with the ACK bit set.
ABDABMF: Ability Detect Ability Match Failure
0: Normal operation.
1: Auto-negotiation failed due to the lack of reception of three consecutive link code words.
Table 22. 10BASE-T Interface DC Electrical Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Parameters
Conditions
Min
Typ
Max
UNITS
Transmitter Differential Output Voltage (Peak)
2.2
2.5
2.8
V
Receiver Normal Squelch Level (Peak)
—
585
—
mV
Receiver Low Squelch Level
—
330
—
mV
Physical Layer Startup Time
—
1
—
ms
Rev. 1.0
93
CP2200/1
Table 23. 10BASE-T Transmit Switching Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Symbol
Parameters
Min
Typ
Max
UNITS
TTXJIT
TX Pair Jitter into 100 Ω Load
—
1
—
ns
TTXHLD
TX Pair Positive Hold time at End of Packet
—
200
—
ns
TTXRET
TX Pair Return to < 50 mV after Last Positive
Transition
—
210
—
ns
Min
Typ
Max
UNITS
Table 24. 10BASE-T Receive Switching Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Symbol
Description
TRXJIT
Allowable Received Jitter
—
—
±13.5
ns
TCSA
Carrier Sense Assertion Delay
—
400
—
ns
TIPB
Invalid Preamble Bits after Assertion of Carrier
Sense
2
—
2
bits
TCSD
Carrier Sense Deassertion Delay
—
200
—
ns
T
TXHLD
TX ±
...
50mV
T
T
TXJIT
TXRET
Figure 19. 10BASE-T Transmit
Carrier Sense (internal)
T
T
CSA
RX ±
...
T
RXJIT
Figure 20. 10BASE-T Receive
94
T
IPB
Rev. 1.0
CSD
...
CP2200/1
Transmit Link Integrity
T
T
TXLP1
TX ±
TXLP2
...
...
...
T
TXLPW
Receive Link Integrity
LINK (LED Driver)
T
T
LPLED
RX ±
RXLP1
...
...
...
Figure 21. 10BASE-T Link Integrity
Table 25. 10BASE-T Link Integrity Switching Characteristics
VDD = 3.1 to 3.6 V, –40 to +85 °C unless otherwise specified.
Symbol
Description
Min
Typ
Max
UNITS
TTXLP1
First Transmitted Link Pulse after Last
Transmitted Packet
—
16
—
ms
TTXLP2
Time Between Transmitted Link Pulses
—
16
—
ms
TTXLPW
Width of Transmitted Link Pulses
80
100
210
ns
TRXLP1
Received Link Pulse Separation
8
—
24
ms
TLPLED
Last Receive Activity to Link Fail
—
150
—
ms
Rev. 1.0
95
CP2200/1
16. Parallel Interface
The CP2200/1 has an 8-bit parallel host interface used to access the direct registers on the device. The parallel
interface supports multiplexed or non-multiplexed operation using the Intel® or Motorola® bus format. The MUXEN
pin can be driven high to place the device in multiplexed operation or driven low to select non-multiplexed
operation. The MOTEN pin can be driven high to place the device in Motorola bus format or driven low to place the
device in Intel bus format.
Notes:
1. The CP2201 (28-pin package) can only be used in multiplexed mode.
2. The PCB traces connecting RD, WR, CS, ALE, and all address and data lines should be matched such that the
propagation delay does not vary by more than 5 ns between any two signals.
A parallel interface read or write operation typically requires 260 ns (non-multiplexed) or 300 ns (multiplexed) to
transfer one byte of data. If back-to-back operations are scheduled on a non-multiplexed bus, data rates up to
30 Mbps can be achieved. Tables 26 through 29 provide detailed information about bus timing in each mode.
16.1. Non-Multiplexed Intel Format
A[7:0]
Valid Address
T
AHR
T
T
T
AS
HOLD
RD
RD
T
T
VD1
VD2
Valid Data
D[7:0]
Notes:
1. CS must be asserted with or before RD.
2. WR must remain de-asserted during a READ.
Figure 22. Nonmuxed Intel READ
A[7:0]
Valid Address
T
AHW
T
T
AS
T
WR
HOLD
WR
T
DS
Valid Data
D[7:0]
Notes:
1. CS must be asserted with or before WR.
2. RD must remain de-asserted during a WRITE.
96
T
Rev. 1.0
DH
CP2200/1
Figure 23. Nonmuxed Intel WRITE
Table 26. Non-Multiplexed Intel Mode AC Parameters
Symbol
Description
Min
Typ
Max
UNITS
TAS
Address Setup Time (Read/Write)
30
—
—
ns
TRD
RD Low Pulse Width (Read)
160
—
—
ns
TVD1
RD Falling to Valid Data Out (Read)
—
—
140
ns
TVD2
RD Rising to Data Bus Tri-State (Read)
—
60
—
ns
TWR
WR Low Pulse Width (Write)
120
—
—
ns
TDS
Data Setup Time (Write)
40
—
—
ns
TDH
Data Hold Time (Write)
20
—
—
ns
TAHR
Address Hold Time (Read)
30
—
—
ns
TAHW
Address Hold Time (Write)
30
—
—
ns
THOLD
Hold Delay (Read/Write)
60
—
—
ns
Rev. 1.0
97
CP2200/1
16.2. Multiplexed Intel Format
T
T
ALE1
ALE2
ALE
T
AS
AD[7:0]
T
AH
T
T
VD1
VD2
Valid Address
Valid Data
T
T
RD
HOLD
RD
Notes:
1. CS must be asserted with or before RD.
2. WR must remain de-asserted during a READ.
Figure 24. Multiplexed Intel READ
T
T
ALE1
ALE2
ALE
T
AS
AD[7:0]
T
T
AH
DS
Valid Address
WR
WR
Notes:
1. CS must be asserted with or before WR
2. RD must remain de-asserted during a WRITE.
Figure 25. Multiplexed Intel WRITE
Rev. 1.0
DH
Valid Data
T
98
T
T
HOLD
CP2200/1
Table 27. Multiplexed Intel Mode AC Parameters
Parameter
Description
Min
Typ
Max
UNITS
TALE1
ALE High Pulse Width
40
—
—
ns
TALE2
ALE Falling to RD/WR Falling
40
—
—
ns
TAS
Address Setup Time (Read/Write)
40
—
—
ns
TAH
Address Hold Time (Read/Write)
40
—
—
ns
TRD
RD Low Pulse Width
160
—
—
ns
TVD1
RD Falling to Valid Data Out
—
—
140
ns
TVD2
RD Rising to Data Bus Tri-State
—
60
—
ns
TWR
WR Low Pulse Width
120
—
—
ns
TDS
Data Setup Time (Write)
40
—
—
ns
TDH
Data Hold Time (Write)
40
—
—
ns
Hold Delay (Read/Write)
60
—
—
ns
THOLD
Rev. 1.0
99
CP2200/1
16.3. Non-Multiplexed Motorola Format
A[7:0]
Valid Address
T
AHR
T
T
T
AS
HOLD
DSR
/DS
T
T
VD1
VD2
D[7:0]
Valid Data
T
T
RWS
RWH
R/W
Note: /CS must be asserted with or before /DS.
Figure 26. Nonmuxed Motorola READ
A[7:0]
Valid Address
T
AHW
T
T
T
AS
HOLD
DSW
/DS
T
DS
D[7:0]
T
DH
Valid Data
T
T
RWS
RWH
R/W
Note: /CS must be asserted with or before /DS.
Figure 27. Nonmuxed Motorola WRITE
100
Rev. 1.0
CP2200/1
Table 28. Non-Multiplexed Motorola Mode AC Parameters
Parameter
Description
Min
Typ
Max
UNITS
TAS
Address Setup Time (Read/Write)
30
—
—
ns
TRWS
R/W Setup Time (Read/Write)
30
—
—
ns
TDSR
DS Low Pulse Width (Read)
160
—
—
ns
TVD1
DS Falling to Valid Data Out (Read)
—
—
140
ns
TVD2
DS Rising to Data Bus Tri-State (Read)
—
60
—
ns
TDSW
DS Low Pulse Width (Write)
120
—
—
ns
TDS
Data Setup Time (Write)
40
—
—
ns
TDH
Data Hold Time (Write)
20
—
—
ns
TAHR
Address Hold Time (Read)
30
—
—
ns
TAHW
Address Hold Time (Write)
30
—
—
ns
TRWH
R/W Hold Time (Read/Write)
20
—
—
ns
THOLD
Hold Delay (Read/Write)
60
—
—
ns
Rev. 1.0
101
CP2200/1
16.4. Multiplexed Motorola Format
T
T
AS1
AS2
AS
T
AS
AD[7:0]
T
T
AH
T
VD1
VD2
Valid Address
Valid Data
T
T
DSR
HOLD
/DS
T
T
RWS
RWH
R/W
Note: /CS must be asserted with or before /DS.
Figure 28. Multiplexed Motorola READ
T
T
AS1
AS2
AS
T
AS
AD[7:0]
T
T
AH
DS
Valid Address
T
DH
Valid Data
T
DSW
T
HOLD
/DS
T
RWS
R/W
Note: /CS must be asserted with or before /DS.
Figure 29. Multiplexed Motorola WRITE
102
Rev. 1.0
T
RWH
CP2200/1
Table 29. Multiplexed Motorola Mode AC Parameters
Parameter
Description
Min
Typ
Max
UNITS
TAS1
AS High Pulse Width (Read/Write)
40
—
—
ns
TAS2
AS Falling to DS Falling (Read/Write)
40
—
—
ns
TAS
Address Setup Time (Read/Write)
40
—
—
ns
TAH
Address Hold Time (Read/Write)
40
—
—
ns
TRWS
R/W Setup Time (Read/Write)
40
—
—
ns
TDSR
DS Low Pulse Width (Read)
160
—
—
ns
TVD1
DS Falling to Valid Data Out (Read)
—
—
140
ns
TVD2
DS Rising to Data Bus Tri-State (Read)
—
60
—
ns
TDSR
DS Low Pulse Width (Write)
120
—
—
ns
TDS
Data Setup Time (Write)
40
—
—
ns
TDH
Data Hold Time (Write)
60
—
—
ns
TRWH
R/W Hold Time (Read/Write)
60
—
—
ns
THOLD
Hold Delay (Read/Write)
60
—
—
ns
Rev. 1.0
103
CP2200/1
17. Revision-Specific Behavior
This chapter contains behavioral differences between CP220x "REV C" and behavior as stated in the data sheet.
17.1. Revision Identification
The Lot ID Code on the top side of the device package can be used for decoding device revision information. On
CP220x devices, the revision letter is the first letter of the Lot ID Code.
Figures 30 and 31 show how to find the Lot ID Code on the top side of the device package.
CP2200
CCLZ9L
This first character identifies
the Silicon Revision
Figure 30. Device Package—TQFP 48
S ILA B S
C P 2201
CCNZW 2
T h is first ch ara cte r id e ntifie s
th e S ilico n R e visio n
Figure 31. Device Package—QFN 28
104
Rev. 1.0
CP2200/1
17.2. MAC Address Filtering
Problem
For unicast packets received over the Ethernet wire, the receive filter only validates the first 5 bytes of the 6-byte
Ethernet MAC Address. Any packet addressed to a device whose MAC address only differs in the 6th byte will be
allowed to pass through the receive filter.
Workaround
The Ethernet driver on the host controller should verify that the 6th byte of each packet (i.e., the final byte of the
MAC address) matches its assigned MAC address. If it detects a mismatch, the packet should be discarded by
writing 1 to the RXSKIP bit.
Implications on Throughput
This behavior does not slow down the rate which the embedded system can send or receive packets, since the
CP220x must receive and filter all packets on the network. However, it can interrupt the host controller for received
packets addressed to another device with a similar MAC address (where the only difference is in the 6th byte) on
the same subnet. On a managed switch network, present on most corporate LANs, the effect of this behavior is
minimal due to the fact that the managed switch filters out unicast packets not addressed to the receiving Ethernet
device.
Rev. 1.0
105
CP2200/1
DOCUMENT CHANGE LIST
Revision 0.4 to Revision 0.41
Modified Figure 2, “Typical Connection Diagram (Non-Multiplexed),” on page 6 and Figure 3, “Typical
Connection Diagram (Multiplexed),” on page 7 for improved EMI emmissions and common mode stability.
Revision 0.41 to Revision 1.0
Added Maximum Supply Current specification in Table 2 on page 9.
Updated the maximum XTAL1 Input Low Voltage specification from 0.8 to 0.7 V (see Table 8 on page 20).
Updated the maximum RST Input Pullup Current specification from 40 to 50 µA (see Table 13 on page 42).
Updated the Non-Multiplexed EMIF address hold time from 20 to 30 ns and the Tvd2 specification from 40 to
60 ns. Note that the Thold specification is unchanged from its value of 60 ns; therefore, changes to host timing
will not be required in most applications. See Section 16 on page 96.
Added a Revision-Specific Behavior chapter. See Section 17 on page 104.
Removed text indicating that all packets on the wire can be received and buffered by the CP220x.
106
Rev. 1.0
CP2200/1
NOTES:
Rev. 1.0
107
CP2200/1
CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Email: [email protected]
Internet: www.silabs.com
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
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