FREESCALE MPC8308CVMADDA

Freescale Semiconductor
Document Number: MPC8308EC
Rev. 0, 05/2010
MPC8308 PowerQUICC II Pro
Processor Hardware Specification
This document provides an overview of the MPC8308
features and its hardware specifications, including a block
diagram showing the major functional components. The
MPC8308 is a cost-effective, low-power, highly integrated
host processor. The MPC8308 extends the PowerQUICC
family, adding higher CPU performance, additional
functionality, and faster interfaces while addressing the
requirements related to time-to-market, price, power
consumption, and package size.
NOTE
The information provided in this document is
preliminary and is based on estimates only and refers to
the pre-silicon phase, with no device characterization
done. Freescale reserves the right to change the
contents of this document as appropriate.
1
Overview
Figure 1 shows the major functional units within the
MPC8308. The e300 core in the MPC8308, with its 16
Kbytes of instruction and 16 Kbytes of data cache,
implements the Power Architecture user instruction set
architecture and provides hardware and software debugging
© Freescale Semiconductor, Inc., 2010. All rights reserved.
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Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . 2
Power Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clock Input Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RESET Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DDR2 SDRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DUART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ethernet: Three-Speed Ethernet, MII Management . 15
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
High-Speed Serial Interfaces (HSSI) . . . . . . . . . . . . 24
PCI Express . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Enhanced Local Bus . . . . . . . . . . . . . . . . . . . . . . . . . 43
Enhanced Secure Digital Host Controller (eSDHC) . 47
JTAG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
I2C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
GPIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
IPIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Package and Pin Listings . . . . . . . . . . . . . . . . . . . . . 62
Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Thermal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
System Design Information . . . . . . . . . . . . . . . . . . . 81
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . 85
Document Revision History . . . . . . . . . . . . . . . . . . . 86
Electrical Characteristics
support. In addition, the MPC8308 offers a PCI Express controller, two three-speed 10, 100, 1000 Mbps
Ethernet controllers (eTSEC), a DDR2 SDRAM memory controller, a SerDes block, an enhanced local
bus controller (eLBC), an integrated programmable interrupt controller (IPIC), a general purpose DMA
controller, two I2C controllers, dual UART (DUART), GPIOs, USB, general purpose timers, and an SPI
controller. The high level of integration in the MPC8308 helps simplify board design and offers significant
bandwidth and performance.
A block diagram of the device is shown in Figure 1.
e300c3 Core with
Power Management
DUART
I2C
Timers
GPIO, SPI
16-Kbyte
I-Cache
Interrupt
Controller
FPU
DMA
USB 2.0 HS
Host/Device/OTG
PCI
Express
Enhanced
Secure
Digital Host
Controller
16-Kbyte
D-Cache
x1
ULPI
Enhanced
Local Bus
DDR2
Controller
eTSEC1
eTSEC2
RGMII,MII
RGMII,MII
Figure 1. MPC8308 Block Diagram
2
Electrical Characteristics
This section provides the AC and DC electrical specifications and thermal characteristics for the
MPC8308. The device is currently targeted to these specifications. Some of these specifications are
independent of the I/O cell, but are included for a more complete reference. These are not purely I/O buffer
design specifications.
2.1
Overall DC Electrical Characteristics
This section covers the ratings, conditions, and other characteristics.
2.1.1
Absolute Maximum Ratings
Table 1 provides the absolute maximum ratings.
Table 1. Absolute Maximum Ratings1
Characteristic
Symbol
Max Value
Unit
Notes
Core supply voltage
VDD
–0.3 to 1.26
V
—
PLL supply voltage
AVDD1, AVDD2
–0.3 to 1.26
V
—
GVDD
–0.3 to 1.9
V
—
DDR2 DRAM I/O voltage
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
2
Freescale Semiconductor
Electrical Characteristics
Table 1. Absolute Maximum Ratings1 (continued)
Characteristic
Symbol
Max Value
Unit
Notes
NVDD
–0.3 to 3.6
V
7
SERDES PHY
XCOREVDD,
XPADVDD,
SDAVDD
–0.3 to 1.26
V
—
eTSEC I/O Voltage
LVDD1, LVDD2
–0.3 to 2.75 or
–0.3 to 3.6
V
6,8
MVIN
–0.3 to (GVDD + 0.3)
V
2, 5
MVREF
–0.3 to (GVDD + 0.3)
V
2, 5
eTSEC
LVIN
–0.3 to (LVDD + 0.3)
V
4, 5,8
Local bus, DUART, system control and power
management, eSDHC, I2C, Interrupt,
Ethernet management, SPI, Miscellaneous
and JTAG I/O voltage
OVIN
–0.3 to (NVDD + 0.3)
V
3, 5,7
TSTG
–55 to 150
°C
—
Local bus, DUART, system control and power management,
eSDHC, I2C, USB, Interrupt, Ethernet management, SPI,
Miscellaneous and JTAG I/O voltage
Input voltage
DDR2 DRAM signals
DDR2 DRAM reference
Storage temperature range
Notes:
1. Functional and tested operating conditions are given in Table 2. Absolute maximum ratings are stress ratings only, and
functional operation at the maximums is not guaranteed. Stresses beyond those listed may affect device reliability or cause
permanent damage to the device.
2. Caution: MVIN must not exceed GVDD by more than 0.3 V. This limit may be exceeded for a maximum of 20 ms during
power-on reset and power-down sequences.
3. Caution: OVIN must not exceed NVDD by more than 0.3 V. This limit may be exceeded for a maximum of 20 ms during
power-on reset and power-down sequences.
4. Caution: LVIN must not exceed LVDD by more than 0.3 V. This limit may be exceeded for a maximum of 20 ms during power-on
reset and power-down sequences.
5. (M, L, O)VIN and MVREF may overshoot/undershoot to a voltage and for a maximum duration as shown in Figure 2
6. The max value of supply voltage should be selected based on the RGMII mode. The lower range applies to RGMII mode.
7. NVDD here refers to NVDDA, NVDDB,NVDDG, NVDDH, NVDDP_K from the ball map.
8. LVDD1 here refers to NVDDC and LVDD2 refers to NVDDF from the ball map
2.1.2
Power Supply Voltage Specification
Table 2 provides the recommended operating conditions for the device. Note that the values in Table 2 are
the recommended and tested operating conditions. Proper device operation outside of these conditions is
not guaranteed.
Table 2. Recommended Operating Conditions
Symbol
Recommended Value1
Unit
SerDes internal digital power
XCOREVDD
1.0 V ± 50 mV
V
SerDes internal digital power
XCOREVSS
0.0
V
SerDes I/O digital power
XPADVDD
1.0 V ± 50 mV
V
SerDes analog power for PLL
SDAVDD
1.0 V ± 50 mV
V
Characteristic
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
3
Electrical Characteristics
Table 2. Recommended Operating Conditions (continued)
Symbol
Recommended Value1
Unit
SerDes analog power for PLL
SDAVSS
0
V
SerDes I/O digital power
XPADVSS
0
V
VDD
1.0 V ± 50 mV
V
Analog supply for e300 core APLL
AVDD1
1.0 V ± 50 mV
V
Analog supply for system APLL
AVDD2
1.0 V ± 50 mV
V
DDR2 DRAM I/O voltage
GVDD
1.8 V ± 100 mV
V
Differential reference voltage for DDR controller
MVREF
GVDD/2 (0.49 × GVDD to
0.51 × GVDD)
V
Standard I/O voltage (Local bus, DUART, system control and power
management, eSDHC, USB, I2C, Interrupt, Ethernet management,
SPI, Miscellaneous and JTAG I/O voltage)2
NVDD
3.3 V ± 300 mV
V
LVDD1, LVDD2
2.5 V ± 125 mV
3.3 V ± 300 mV
V
VSS
0.0
V
TA/TJ
0 to 105
°C
Characteristic
Core supply voltage
eTSEC IO supply3,4
Analog and digital ground
Junction temperature5
Note:
1
2
3
4
5
GVDD, NVDD, AVDD, and VDD must track each other and must vary in the same direction—either in the positive or negative
direction.
NVDD here refers to NVDDA, NVDDB,NVDDG, NVDDH and NVDDP_K from the ball map.
The max value of supply voltage should be selected based on the RGMII mode. The lower range applies to RGMII mode.
LVDD1 here refers to NVDDC and LVDD2 refers to NVDDF from the ball map.
Minimum temperature is specified with TA; Maximum temperature is specified with TJ.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
4
Freescale Semiconductor
Electrical Characteristics
Figure 2 shows the undershoot and overshoot voltages at the interfaces of the device
G/L/NVDD + 20%
G/L/NVDD + 5%
G/L/NVDD
VIH
VSS
VSS – 0.3 V
VIL
VSS – 0.7 V
Not to Exceed 10%
of tinterface1
Note:
1. Note that tinterface refers to the clock period associated with the bus clock interface.
Figure 2. Overshoot/Undershoot Voltage for GVDD/NVDD/LVDD
2.1.3
Output Driver Characteristics
Table 3 provides information on the characteristics of the output driver strengths.
Table 3. Output Drive Capability
Driver Type
Output Impedance (Ω)
Supply Voltage
42
NVDD = 3.3 V
18
GVDD = 1.8 V
DUART, system control, I2C, JTAG, eSDHC, GPIO,SPI, USB
42
NVDD = 3.3 V
eTSEC signals
42
LVDD = 2.5/3.3 V
Local bus interface utilities signals
DDR2
1
2.1.4
signals1
Output Impedance can also be adjusted through configurable options in DDR Control Driver Register (DDRCDR).
For more information, see the MPC8308 PowerQUICC II Pro Processor Reference Manual.
Power Sequencing
The device does not require the core supply voltage (VDD) and IO supply voltages (GVDD, LVDD, and
NVDD) to be applied in any particular order. Note that during power ramp-up, before the power supplies
are stable and if the I/O voltages are supplied before the core voltage, there might be a period of time that
all input and output pins are actively driven and cause contention and excessive current. In order to avoid
actively driving the I/O pins and to eliminate excessive current draw, apply the core voltage (VDD) before
the I/O voltage (GVDD, LVDD, and NVDD) and assert PORESET before the power supplies fully ramp up.
In the case where the core voltage is applied first, the core voltage supply must rise to 90% of its nominal
value before the I/O supplies reach 0.7 V; see Figure 3.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
5
Power Characteristics
The I/O power supply ramp-up slew rate should be slower than 4V/100 μs, this requirement is for ESD
circuit
Note that there is no specific power down sequence requirement for the device. I/O voltage supplies
(GVDD, LVDD, and NVDD) do not have any ordering requirements with respect to one another.
I/O Voltage (GVDD, LVDD, and NVDD)
V
Core Voltage (VDD)
0.7 V
90%
t
0
PORESET
>= 32 × tSYS_CLK_IN
Figure 3. Power-Up Sequencing Example
3
Power Characteristics
The estimated typical power dissipation, not including I/O supply power for the device is shown in Table 4.
Table 5 shows the estimated typical I/O power dissipation.
Table 4. MPC8308 Power Dissipation1
Core Frequency (MHz)
CSB Frequency (MHz)
Typical2
Maximum 3
Unit
266
133
530
900
mW
333
133
565
950
mW
400
133
600
1000
mW
Note:
1
The values do not include I/O supply power but do include core (AVDD)and PLL (AVDD1,
AVDD2, XCOREVDD, XPADVDD, SDAVDD)
2
Typical power is based on best process, a voltage of VDD = 1.0V and ambient temperature
of TA = 25° C
3
Maximum power is estimated based on best process, a voltage of VDD = 1.05 V, a ambient
temperature of TA = 105° C
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
6
Freescale Semiconductor
Clock Input Timing
Table 5 describes a typical scenario where blocks with the stated percentage of utilization and impedances
consume the amount of power described.
1
Table 5. MPC8308 Typical I/O Power Dissipation
GVDD
(1.8 V)
NVDD
(3.3 V)
LVDD/
(3.3 V)
LVDD
(2.5 V)
Unit
Comments
250 MHz
32 bits+ECC
266 MHz
32 bits+ECC
0.302
—
—
—
W
—
62.5 MHz
66 MHZ
—
0.038
0.040
—
—
W
—
MII,
25 MHz
—
—
0.008
—
W
2 controllers
RGMII,
125 MHz
—
—
0.078
0.044
W
eSDHC IO Load = 40 pF
50 MHz
—
—
0.008
—
W
—
USB IO Load = 20 pF
60 MHz
—
—
0.012
W
—
—
—
0.017
—
W
—
Interface
Parameter
DDR2
Rs = 22 Ω
Rt = 75 Ω
Local bus I/O load = 20 pF
TSEC I/O load = 20 pF
Other I/O
4
0.309
—
Clock Input Timing
This section provides the clock input DC and AC electrical characteristics for the device.
4.1
DC Electrical Characteristics
Table 6 provides the system clock input (SYS_CLK_IN) DC Electrical specifications for the device.
Table 6. SYS_CLK_IN DC Electrical Characteristics
Parameter
Condition
Symbol
Min
Max
Unit
Input high voltage
—
VIH
2.4
NVDD + 0.3
V
Input low voltage
—
VIL
–0.3
0.4
V
0 V ≤ VIN ≤ NVDD
IIN
—
±10
μA
SYS_CLK_IN input current
Table 7 provides the RTC clock input (RTC_PIT_CLOCK) DC Electrical specifications for the device.
Table 7. RTC_PIT_CLOCK DC Electrical Characteristics
Parameter
Condition
Symbol
Min
Input high voltage
—
VIH
3.3V – 400 mV
Input low voltage
—
VIL
0
Max
Unit
V
0.4
V
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
7
RESET Initialization
4.2
AC Electrical Characteristics
The primary clock source for the device is SYS_CLK_IN. Table 8 provides the system clock input
(SYS_CLK_IN) AC timing specifications for the device.
Table 8. SYS_CLK_IN AC Timing Specifications
Parameter/
Symbol
Min
Typ
Max
Unit
Notes
SYS_CLK_IN Frequency
fSYS_CLK_IN
24
—
66
MHz
1, 6
SYS_CLK_IN Period
tSYS_CLK_IN
15.15
—
41.67
ns
—
tKH, tKL
0.6
1.2
ns
2
tKHK/tSYS_CLK_IN
40
—
60
%
3
—
—
—
±150
ps
4, 5
SYS_CLK_IN Rise and Fall time
SYS_CLK_IN Duty Cycle
SYS_CLK_IN Jitter
Notes:
1. Caution: The system and core must not exceed their respective maximum or minimum operating frequencies.
2. Rise and fall times for SYS_CLK_IN are measured at 0.4 and 2.7 V.
3. Timing is guaranteed by design and characterization.
4. This represents the total input jitter—short term and long term—and is guaranteed by design.
5. The SYS_CLK_IN driver’s closed loop jitter bandwidth should be <500 kHz at –20 dB. The bandwidth must be set low to
allow cascade-connected PLL-based devices to track SYS_CLK_IN drivers with the specified jitter.
6. Spread spectrum is allowed up to 1% down-spread @ 33 kHz (max rate).
Table 9. RTC_PIT_CLOCK AC Timing Specifications
Parameter/
RTC_PIT_CLOCK Frequency
Symbol
Min
Typ
Max
Unit
Notes
fRTC_PIT_CLOCK
1
32768
—
Hz
—
tRTCH, tRTCL
1.5
—
3
μs
—
tRTCHK/tRTC_PIT_CLO
45
—
55
%
—
RTC_PIT_CLOCK Rise and Fall time
RTC_PIT_CLOCK Duty Cycle
CK
5
RESET Initialization
This section describes the DC and AC electrical specifications for the reset initialization timing and
electrical requirements of the device.
5.1
RESET DC Electrical Characteristics
Table 10 provides the DC electrical characteristics for the RESET pins.
Table 10. RESET Pins DC Electrical Characteristics
Characteristic
Symbol
Condition
Min
Max
Unit
Input high voltage
VIH
—
2.0
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
0 V ≤ VIN ≤ NVDD
±5
μA
VOH
IOH = –8.0 mA
—
V
Output high voltage
2.4
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
8
Freescale Semiconductor
RESET Initialization
Table 10. RESET Pins DC Electrical Characteristics (continued)
Characteristic
5.2
Symbol
Condition
Min
Max
Unit
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
RESET AC Electrical Characteristics
Table 11 provides the reset initialization AC timing specifications.
Table 11. RESET Initialization Timing Specifications
Parameter/Condition
Min
Max
Unit
Notes
Required assertion time of HRESET (input) to activate reset flow
32
—
tSYS_CLK_IN
1
Required assertion time of PORESET with stable power and clock applied to
SYS_CLK_IN
32
—
tSYS_CLK_IN
—
HRESET assertion (output)
512
—
tSYS_CLK_IN
1
Input setup time for POR configuration signals (CFG_RESET_SOURCE[0:3]) with
respect to negation of PORESET
4
—
tSYS_CLK_IN
—
Input hold time for POR configuration signals with respect to negation of HRESET
0
—
ns
—
Time for the device to turn off POR configuration signal drivers with respect to the
assertion of HRESET
—
4
ns
2
Time for the device to turn on POR configuration signal drivers with respect to the
negation of HRESET
1
—
ns
1, 2
Notes:
1. tSYS_CLK_IN is the clock period of the input clock applied to SYS_CLK_IN.
2. POR configuration signals consists of CFG_RESET_SOURCE[0:3]
Table 12 provides the PLL lock times.
Table 12. PLL Lock Times
Parameter/Condition
Min
Max
Unit
Notes
System PLL lock time
—
100
μs
—
e300 core PLL lock time
—
100
μs
—
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
9
DDR2 SDRAM
6
DDR2 SDRAM
This section describes the DC and AC electrical specifications for the DDR2 SDRAM interface. Note that
DDR2 SDRAM is GVDD(typ) = 1.8 V.
6.1
DDR2 SDRAM DC Electrical Characteristics
Table 13 provides the recommended operating conditions for the DDR2 SDRAM component(s) when
GVDD(typ) = 1.8 V.
Table 13. DDR2 SDRAM DC Electrical Characteristics for GVDD(typ) = 1.8 V
Parameter/Condition
Symbol
Min
Max
Unit
Notes
I/O supply voltage
GVDD
1.7
1.9
V
1
I/O reference voltage
MVREF
0.49 × GVDD
0.51 × GVDD
V
2
I/O termination voltage
VTT
MVREF – 0.04
MVREF + 0.04
V
3
Input high voltage
VIH
MVREF + 0.125
GVDD + 0.3
V
—
Input low voltage
VIL
–0.3
MVREF – 0.125
V
—
Output leakage current
IOZ
–9.9
9.9
μA
4
Output high current (VOUT = 1.420 V)
IOH
–13.4
—
mA
—
Output low current (VOUT = 0.280 V)
IOL
13.4
—
mA
—
Notes:
1. GVDD is expected to be within 50 mV of the DRAM GVDD at all times.
2. MVREF is expected to be equal to 0.5 × GVDD, and to track GVDD DC variations as measured at the receiver.
Peak-to-peak noise on MVREF may not exceed ±2% of the DC value.
3. VTT is not applied directly to the device. It is the supply to which far end signal termination is made and is expected to be
equal to MVREF. This rail should track variations in the DC level of MVREF.
4. Output leakage is measured with all outputs disabled, 0 V ≤ VOUT ≤ GVDD.
Table 14 provides the DDR2 capacitance when GVDD(typ) = 1.8 V.
Table 14. DDR2 SDRAM Capacitance for GVDD(typ)=1.8 V
Parameter/Condition
Symbol
Min
Max
Unit
Notes
Input/output capacitance: DQ, DQS, DQS
CIO
6
8
pF
1
Delta input/output capacitance: DQ, DQS, DQS
CDIO
—
0.5
pF
1
Note:
1. This parameter is sampled. GVDD = 1.8 V ± 0.090 V, f = 1 MHz, TA = 25°C, VOUT = GVDD/2, VOUT (peak-to-peak) = 0.2 V.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
10
Freescale Semiconductor
DDR2 SDRAM
Table 15 provides the current draw characteristics for MVREF.
Table 15. Current Draw Characteristics for MVREF
Parameter / Condition
Current draw for MVREF
Symbol
Min
Max
Unit
Note
IMVREF
—
500
μA
1
Note:
1. The voltage regulator for MVREF must be able to supply up to 500 μA current.
6.2
DDR2 SDRAM AC Electrical Characteristics
This section provides the AC electrical characteristics for the DDR2 SDRAM interface.
6.2.1
DDR2 SDRAM Input AC Timing Specifications
Table 16 provides the input AC timing specifications for the DDR2 SDRAM when GVDD(typ)=1.8V.
Table 16. DDR2 SDRAM Input AC Timing Specifications for 1.8 V Interface
At recommended operating conditions with GVDD of 1.8 ± 100 mV
Parameter
Symbol
Min
Max
Unit
Notes
AC input low voltage
VIL
—
MVREF – 0.45
V
—
AC input high voltage
VIH
MVREF + 0.45
—
V
—
Table 17 provides the input AC timing specifications for the DDR2 SDRAM interface.
Table 17. DDR2 SDRAM Input AC Timing Specifications
At recommended operating conditions. with GVDD of 1.8± 100 mV
Parameter
Symbol
Min
Max
Unit
Notes
Controller skew for MDQS—MDQ/MECC
266 MHz
tCISKEW
–875
875
ps
1, 2,3
Notes:
1. tCISKEW represents the total amount of skew consumed by the controller between MDQS[n] and any corresponding bit that is
captured with MDQS[n]. This should be subtracted from the total timing budget.
2. The amount of skew that can be tolerated from MDQS to a corresponding MDQ or MECC signal is called tDISKEW. This can
be determined by the following equation: tDISKEW = +/–(T/4 – abs(tCISKEW)) where T is the clock period and abs(tCISKEW) is
the absolute value of tCISKEW.
3. Memory controller ODT value of 150 Ω is recommended
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
11
DDR2 SDRAM
Figure 4 illustrates the DDR2 input timing diagram showing the tDISKEW timing parameter.
MCK[n]
MCK[n]
tMCK
MDQS[n]
MDQ[x]/
MECC[x]
D0
D1
tDISKEW
tDISKEW
Figure 4. Timing Diagram for tDISKEW
6.2.2
DDR2 SDRAM Output AC Timing Specifications
Table 18. DDR2 SDRAM Output AC Timing Specifications
Parameter
MCK[n] cycle time, MCK[n]/MCK[n] crossing
ADDR/CMD output setup with respect to MCK
Symbol 1
Min
Max
Unit
Notes
tMCK
7.5
10
ns
2
ns
3
ns
3
ns
3
ns
3
ns
4
ps
5
ps
5
tDDKHAS
266 MHz
ADDR/CMD output hold with respect to MCK
2.9
tDDKHAX
266 MHz
MCS[n] output setup with respect to MCK
2.33
3.15
MCK to MDQS Skew
tDDKHMH
MDQ//MDM/MECC output setup with respect to
MDQS
tDDKHDS,
tDDKLDS
266 MHz
266 MHz
—
tDDKHCX
266 MHz
MDQ//MDM/MECC output hold with respect to
MDQS
—
tDDKHCS
266 MHz
MCS[n] output hold with respect to MCK
—
3.15
—
–0.6
0.6
900
—
tDDKHDX,
tDDKLDX
1100
—
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
DDR2 SDRAM
Table 18. DDR2 SDRAM Output AC Timing Specifications (continued)
Symbol 1
Min
Max
Unit
Notes
MDQS preamble start
tDDKHMP
–0.5 × tMCK – 0.6
–0.5 × tMCK + 0.6
ns
6
MDQS epilogue end
tDDKHME
–0.6
0.6
ns
6
Parameter
Notes:
1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. Output hold time can be read as DDR timing
(DD) from the rising or falling edge of the reference clock (KH or KL) until the output went invalid (AX or DX). For example,
tDDKHAS symbolizes DDR timing (DD) for the time tMCK memory clock reference (K) goes from the high (H) state until outputs
(A) are setup (S) or output valid time. Also, tDDKLDX symbolizes DDR timing (DD) for the time tMCK memory clock reference
(K) goes low (L) until data outputs (D) are invalid (X) or data output hold time.
2. All MCK/MCK referenced measurements are made from the crossing of the two signals ±0.1 V.
3. ADDR/CMD includes all DDR SDRAM output signals except MCK/MCK, MCS, and MDQ/MECC/MDM/MDQS.
4. Note that tDDKHMH follows the symbol conventions described in note 1. For example, tDDKHMH describes the DDR timing (DD)
from the rising edge of the MCK[n] clock (KH) until the MDQS signal is valid (MH). tDDKHMH can be modified through control
of the DQSS override bits in the TIMING_CFG_2 register. This is typically set to the same delay as the clock adjust in the
CLK_CNTL register. The timing parameters listed in the table assume that these 2 parameters have been set to the same
adjustment value. For a description and understanding of the timing modifications enabled by use of these bits, see the
MPC8308 PowerQUICC II Pro Processor Reference Manual.
5. Determined by maximum possible skew between a data strobe (MDQS) and any corresponding bit of data (MDQ), ECC
(MECC), or data mask (MDM). The data strobe should be centered inside of the data eye at the pins of the microprocessor.
6. All outputs are referenced to the rising edge of MCK[n] at the pins of the microprocessor. Note that tDDKHMP follows the
symbol conventions described in note 1.
Figure 5 shows the DDR2 SDRAM output timing for the MCK to MDQS skew measurement
(tDDKHMH).
MCK[n]
MCK[n]
tMCK
tDDKHMHmax) = 0.6 ns
MDQS
tDDKHMH(min) = –0.6 ns
MDQS
Figure 5. Timing Diagram for tDDKHMH
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
13
DUART
Figure 6 shows the DDR2 SDRAM output timing diagram.
MCK[n]
MCK[n]
tMCK
tDDKHAS ,tDDKHCS
tDDKHAX ,tDDKHCX
ADDR/CMD
Write A0
NOOP
tDDKHMP
tDDKHMH
MDQS[n]
tDDKHME
tDDKHDS
tDDKLDS
MDQ[x]/
MECC[x]
D0
D1
tDDKLDX
tDDKHDX
Figure 6. DDR2 SDRAM Output Timing Diagram
Figure 7 provides the AC test load for the DDR2 bus.
Z0 = 50 Ω
Output
RL = 50 Ω
GVDD/2
Figure 7. DDR2 AC Test Load
7
DUART
This section describes the DC and AC electrical specifications for the DUART interface.
7.1
DUART DC Electrical Characteristics
Table 19 provides the DC electrical characteristics for the DUART interface.
Table 19. DUART DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
High-level input voltage
VIH
2.1
NVDD + 0.3
V
Low-level input voltage NVDD
VIL
–0.3
0.8
V
High-level output voltage, IOH = –100 μA
VOH
NVDD – 0.2
—
V
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
Table 19. DUART DC Electrical Characteristics (continued)
Parameter
Low-level output voltage, IOL = 100 μA
Input current (0 V ≤VIN ≤ NVDD)
7.2
Symbol
Min
Max
Unit
VOL
—
0.2
V
IIN
—
±5
μA
DUART AC Electrical Specifications
Table 20 provides the AC timing parameters for the DUART interface.
Table 20. DUART AC Timing Specifications
Parameter
Value
Unit
Notes
Minimum baud rate
256
baud
—
Maximum baud rate
> 1,000,000
baud
1
16
—
2
Oversample rate
Notes:
1. Actual attainable baud rate is limited by the latency of interrupt processing.
2. The middle of a start bit is detected as the 8th sampled 0 after the 1-to-0 transition of the start bit.
Subsequent bit values are sampled each 16th sample.
8
Ethernet: Three-Speed Ethernet, MII Management
This section provides the AC and DC electrical characteristics for three-speed, 10/100/1000, and MII
management. MPC8308 supports dual Ethernet controllers.
8.1
Enhanced Three-Speed Ethernet Controller (eTSEC)
(10/100/1000 Mbps)—MII/RGMII Electrical Characteristics
The electrical characteristics specified here apply to all the media independent interface (MII) and reduced
gigabit media independent interface (RGMII), signals except management data input/output (MDIO) and
management data clock (MDC). The RGMII interface is defined for 2.5 V, while the MII interface can be
operated at 3.3 V. The RGMII interface follows the Hewlett-Packard reduced pin-count interface for
Gigabit Ethernet Physical Layer Device Specification Version 1.2a (9/22/2000). The electrical
characteristics for MDIO and MDC are specified in Section 8.3, “Ethernet Management Interface
Electrical Characteristics.”
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
15
Ethernet: Three-Speed Ethernet, MII Management
8.1.1
eTSEC DC Electrical Characteristics
All MII and RGMII drivers and receivers comply with the DC parametric attributes specified in Table 21
and Table 22. The RGMII signals are based on a 2.5-V CMOS interface voltage as defined by JEDEC
EIA/JESD8-5.
Table 21. MII DC Electrical Characteristics
Parameter
Symbol
Conditions
Min
Max
Unit
Supply voltage 3.3 V
LVDD
—
3.0
3.6
V
Output high voltage
VOH
IOH = –4.0 mA
LVDD = Min
2.40
LVDD + 0.3
V
Output low voltage
VOL
IOL = 4.0 mA
LVDD= Min
VSS
0.50
V
Input high voltage
VIH
—
—
2.1
LVDD + 0.3
V
Input low voltage
VIL
—
—
–0.3
0.90
V
Input high current
IIH
VIN = LVDD
—
40
μA
Input low current
IIL
VIN 1 = VSS
–600
—
μA
1
Note:
1. The symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.
Table 22. RGMII DC Electrical Characteristics
Parameters
Symbol
Conditions
Min
Max
Unit
Supply voltage 2.5 V
LVDD
—
2.37
2.63
V
Output high voltage
VOH
IOH = –1.0 mA
LVDD = Min
2.00
LVDD + 0.3
V
Output low voltage
VOL
IOL = 1.0 mA
LVDD= Min
VSS – 0.3
0.40
V
Input high voltage
VIH
—
LVDD = Min
1.7
LVDD + 0.3
V
Input low voltage
VIL
—
LVDD = Min
–0.3
0.70
V
Input high current
IIH
—
15
μA
–15
—
μA
Input low current
IIL
VIN 1 = LVDD
1
VIN = VSS
Note:
1. Note that the symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.
8.2
MII and RGMII AC Timing Specifications
The AC timing specifications for MII and RGMII are presented in this section.
8.2.1
MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
16
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
8.2.1.1
MII Transmit AC Timing Specifications
Table 23 provides the MII transmit AC timing specifications.
Table 23. MII Transmit AC Timing Specifications
At recommended operating conditions with LVDDA/LVDDB /NVDD of 3.3 V ± 0.3V.
Symbol 1
Min
Typ
Max
Unit
TX_CLK clock period 10 Mbps
tMTX
—
400
—
ns
TX_CLK clock period 100 Mbps
tMTX
—
40
—
ns
tMTXH/tMTX
35
—
65
%
tMTKHDX
1
5
15
ns
TX_CLK data clock rise VIL(min) to VIH(max)
tMTXR
1.0
—
4.0
ns
TX_CLK data clock fall VIH(max) to VIL(min)
tMTXF
1.0
—
4.0
ns
Parameter/Condition
TX_CLK duty cycle
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
Note:
1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMTKHDX symbolizes MII transmit
timing (MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,
the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.
For example, the subscript of tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
Figure 8 shows the MII transmit AC timing diagram.
tMTXR
tMTX
TX_CLK
tMTXH
tMTXF
TXD[3:0]
TX_EN
TX_ER
tMTKHDX
Figure 8. MII Transmit AC Timing Diagram
8.2.1.2
MII Receive AC Timing Specifications
Table 24 provides the MII receive AC timing specifications.
Table 24. MII Receive AC Timing Specifications
At recommended operating conditions with LVDD /NVDD of 3.3 V ± 0.3V.
Symbol 1
Min
Typ
Max
Unit
RX_CLK clock period 10 Mbps
tMRX
—
400
—
ns
RX_CLK clock period 100 Mbps
tMRX
—
40
—
ns
tMRXH/tMRX
35
—
65
%
tMRDVKH
10.0
—
—
ns
Parameter/Condition
RX_CLK duty cycle
RXD[3:0], RX_DV, RX_ER setup time to RX_CLK
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
17
Ethernet: Three-Speed Ethernet, MII Management
Table 24. MII Receive AC Timing Specifications (continued)
At recommended operating conditions with LVDD /NVDD of 3.3 V ± 0.3V.
Symbol 1
Min
Typ
Max
Unit
tMRDXKH
10.0
—
—
ns
RX_CLK clock rise VIL(min) to VIH(max)
tMRXR
1.0
—
4.0
ns
RX_CLK clock fall time VIH(max) to VIL(min)
tMRXF
1.0
—
4.0
ns
Parameter/Condition
RXD[3:0], RX_DV, RX_ER hold time to RX_CLK
Note:
1. The symbols used for timing specifications herein follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state)
for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMRDVKH symbolizes MII
receive timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to the tMRX clock reference
(K) going to the high (H) state or setup time. Also, tMRDXKL symbolizes MII receive timing (GR) with respect to the time data
input signals (D) went invalid (X) relative to the tMRX clock reference (K) going to the low (L) state or hold time. Note that, in
general, the clock reference symbol representation is based on three letters representing the clock of a particular functional.
For example, the subscript of tMRX represents the MII (M) receive (RX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
Figure 9 shows the MII receive AC timing diagram.
tMRXR
tMRX
RX_CLK
tMRXF
tMRXH
RXD[3:0]
RX_DV
RX_ER
Valid Data
tMRDVKH
tMRDXKH
Figure 9. MII Receive AC Timing Diagram RMII AC Timing Specifications
Figure 10 provides the AC test load.
Z0 = 50 Ω
Output
RL = 50 Ω
NVDD/2
or
LVDD/2
Figure 10. AC Test Load
8.2.2
RGMII AC Timing Specifications
Table 25 presents the RGMII AC timing specifications.
Table 25. RGMII AC Timing Specifications
At recommended operating conditions with LVDD of 2.5 V ± 5%.
Parameter/Condition
Data to clock output skew (at transmitter)
Data to clock input skew (at receiver)
2
Symbol 1
Min
Typ
Max
Unit
tSKRGT
–0.6
—
0.6
ns
tSKRGT
1.0
—
2.6
ns
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
18
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
Table 25. RGMII AC Timing Specifications (continued)
At recommended operating conditions with LVDD of 2.5 V ± 5%.
Clock cycle duration 3
tRGT
7.2
8.0
8.8
ns
tRGTH/tRGT
45
50
55
%
tRGTH/tRGT
40
50
60
%
Rise time (20%–80%)
tRGTR
—
—
0.75
ns
Fall time (20%–80%)
tRGTF
—
—
0.75
ns
6
—
8.0
—
ns
47
—
53
%
Duty cycle for 1000Base-T
4, 5
Duty cycle for 10BASE-T and 100BASE-TX
3, 5
GTX_CLK125 reference clock period
tG12
GTX_CLK125 reference clock duty cycle
tG125H/tG125
Notes:
1. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to represent
RGMII timing. For example, the subscript of tRGT represents the RGMII receive (RX) clock. Note also that the notation for rise
(R) and fall (F) times follows the clock symbol that is being represented. For symbols representing skews, the subscript is
skew (SK) followed by the clock that is being skewed (RGT).
2. This implies that PC board design requires clocks to be routed such that an additional trace delay of greater than 1.5 ns is
added to the associated clock signal.
3. For 10 and 100 Mbps, tRGT scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains as long
as the minimum duty cycle is not violated and stretching occurs for no more than three tRGT of the lowest speed transitioned
between.
5. Duty cycle reference is 0.5*LVDD
6. This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming convention.
Figure 11 shows the RGMII AC timing and multiplexing diagrams.
tRGT
tRGTH
GTX_CLK
(At Transmitter)
tSKRGT
TXD[8:5][3:0]
TXD[7:4][3:0]
TX_CTL
TXD[3:0]
TXD[8:5]
TXD[7:4]
TXD[4]
TXEN
TXD[9]
TXERR
tSKRGT
TX_CLK
(At PHY)
RXD[8:5][3:0]
RXD[7:4][3:0]
RXD[8:5]
RXD[3:0] RXD[7:4]
tSKRGT
RX_CTL
RXD[4]
RXDV
RXD[9]
RXERR
tSKRGT
RX_CLK
(At PHY)
Figure 11. RGMII AC Timing and Multiplexing Diagrams
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
19
Ethernet: Three-Speed Ethernet, MII Management
8.3
Ethernet Management Interface Electrical Characteristics
The electrical characteristics specified here apply to MII management interface signals MDIO
(management data input/output) and MDC (management data clock). The electrical characteristics for MII
and RGMII are specified in Section 8.1, “Enhanced Three-Speed Ethernet Controller (eTSEC)
(10/100/1000 Mbps)—MII/RGMII Electrical Characteristics.”
8.3.1
MII Management DC Electrical Characteristics
The MDC and MDIO are defined to operate at a supply voltage of 3.3 V. Table 26 provides the DC
electrical characteristics for MDIO and MDC.
Table 26. MII Management DC Electrical Characteristics When Powered at 3.3 V
Parameter
Symbol
Conditions
Min
Max
Unit
Supply voltage (3.3 V)
NVDD
—
3.0
3.6
V
Output high voltage
VOH
IOH = –1.0 mA
NVDD = Min
2.10
NVDD + 0.3
V
Output low voltage
VOL
IOL = 1.0 mA
LVDD = Min
VSS
0.50
V
Input high voltage
VIH
—
2.0
—
V
Input low voltage
VIL
—
—
0.80
V
Input high current
IIH
NVDD = Max
VIN = 2.1 V
—
40
μA
Input low current
IIL
NVDD = Max
VIN = 0.5 V
–600
—
μA
1
Note:
1. Note that the symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.
8.3.2
MII Management AC Electrical Specifications
Table 27 provides the MII management AC timing specifications.
Table 27. MII Management AC Timing Specifications
At recommended operating conditions with LVDDA/LVDDB is 3.3 V ± 0.3V
Symbol 1
Min
Typ
Max
Unit
Notes
MDC frequency
fMDC
—
2.5
—
MHz
2
MDC period
tMDC
—
400
—
ns
—
MDC clock pulse width high
tMDCH
32
—
—
ns
—
MDC to MDIO delay
tMDKHDX
10
—
170
ns
3
MDIO to MDC setup time
tMDDVKH
5
—
—
ns
—
MDIO to MDC hold time
tMDDXKH
0
—
—
ns
—
tMDCR
—
—
10
ns
—
Parameter/Condition
MDC rise time
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
20
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
Table 27. MII Management AC Timing Specifications (continued)
At recommended operating conditions with LVDDA/LVDDB is 3.3 V ± 0.3V
Parameter/Condition
MDC fall time
Symbol 1
Min
Typ
Max
Unit
Notes
tMDHF
—
—
10
ns
—
Notes:
1. The symbols used for timing specifications Follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMDKHDX symbolizes management
data timing (MD) for the time tMDC from clock reference (K) high (H) until data outputs (D) are invalid (X) or data hold time.
Also, tMDDVKH symbolizes management data timing (MD) with respect to the time data input signals (D) reach the valid state
(V) relative to the tMDC clock reference (K) going to the high (H) state or setup time. For rise and fall times, the latter
convention is used with the appropriate letter: R (rise) or F (fall).
2. This parameter is dependent on the csb_clk speed. (The MIIMCFG[Mgmt Clock Select] field determines the clock frequency
of the Mgmt Clock EC_MDC.)
3. This parameter is dependent on the cbs_clk speed (that is, for a csb_clk of 133 MHz, the delay is 60 ns).
Figure 12 shows the MII management AC timing diagram.
tMDCR
tMDC
MDC
tMDCF
tMDCH
MDIO
(Input)
tMDDVKH
tMDDXKH
MDIO
(Output)
tMDKHDX
Figure 12. MII Management Interface Timing Diagram
8.4
IEEE Std 1588™ Timer Specifications
This section describes the DC and AC electrical specifications for the 1588 timer.
8.4.1
IEEE 1588 Timer DC Specifications
Table 28 provides the IEEE 1588 timer DC specifications.
Table 28. GPIO DC Electrical Characteristics
Characteristic
Symbol
Condition
Min
Max
Unit
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
Input high voltage
VIH
—
2.0
NVDD + 0.3
V
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
21
USB
Table 28. GPIO DC Electrical Characteristics (continued)
Characteristic
Symbol
Condition
Min
Max
Unit
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
0 V ≤ VIN ≤ NVDD
—
±5
μA
8.4.2
IEEE 1588 Timer AC Specifications
Table 29 provides the IEEE 1588 timer AC specifications.
Table 29. IEEE 1588 Timer AC Specifications
Parameter
Symbol
Min
Max
Unit
Notes
Timer clock cycle time
tTMRCK
0
70
MHz
1
Input setup to timer clock
tTMRCKS
—
—
—
2, 3
Input hold from timer clock
tTMRCKH
—
—
—
2, 3
Output clock to output valid
tGCLKNV
0
6
ns
—
Timer alarm to output valid
tTMRAL
—
—
—
2
Note:
1. The timer can operate on rtc_clock or tmr_clock. These clocks get muxed and any one of them can be selected.
2. Asynchronous signals.
3. Inputs need to be stable at least one TMR clock.
9
9.1
USB
USB Dual-Role Controllers
This section provides the AC and DC electrical specifications for the USB-ULPI interface.
9.1.1
USB DC Electrical Characteristics
Table 30 lists the DC electrical characteristics for the USB interface.
Table 30. USB DC Electrical Characteristics
Parameter
Symbol
Min
Max
Unit
High-level input voltage
VIH
2
LVDD + 0.3
V
Low-level input voltage
VIL
–0.3
0.8
V
Input current
IIN
—
±5
μA
High-level output voltage, IOH = –100 μA
VOH
LVDD – 0.2
—
V
Low-level output voltage, IOL = 100 μA
VOL
—
0.2
V
Note:
1. The symbol VIN, in this case, represents the NVIN symbol referenced in Table 1 and Table 2.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
USB
9.1.2
USB AC Electrical Specifications
Table 31 lists the general timing parameters of the USB-ULPI interface.
Table 31. USB General Timing Parameters
Symbol 1
Min
Max
Unit
Notes
tUSCK
15
—
ns
1, 2
Input setup to USB clock—all inputs
tUSIVKH
4
—
ns
1, 4
Input hold to USB clock—all inputs
tUSIXKH
1
—
ns
1, 4
USB clock to output valid—all outputs
tUSKHOV
—
9
ns
1
Output hold from USB clock—all outputs
tUSKHOX
1
—
ns
1
Parameter
USB clock cycle time
Notes:
1. The symbols used for timing specifications follow the pattern of t(First two letters of functional block)(signal)(state)(reference)(state) for
inputs and t(First two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tUSIXKH symbolizes usb timing
(US) for the input (I) to go invalid (X) with respect to the time the usb clock reference (K) goes high (H). Also, tUSKHOX
symbolizes usb timing (US) for the usb clock reference (K) to go high (H), with respect to the output (O) going invalid (X) or
output hold time.
2. All timings are in reference to USB clock.
3. All signals are measured from NVDD/2 of the rising edge of USB clock to 0.4 × NVDD of the signal in question for 3.3-V
signaling levels.
4. Input timings are measured at the pin.
5. For purposes of active/float timing measurements, the Hi-Z or off-state is defined to be when the total current delivered
through the component pin is less than or equal to the leakage current specification.
Figure 13 and Figure 14 provide the AC test load and signals for the USB, respectively.
Z0 = 50 Ω
Output
RL = 50 Ω
NVDD/2
Figure 13. USB AC Test Load
USBDR_CLK
tUSIVKH
tUSIXKH
Input Signals
tUSKHOV
tUSKHOX
Output Signals
Figure 14. USB Signals
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
23
High-Speed Serial Interfaces (HSSI)
10 High-Speed Serial Interfaces (HSSI)
This section describes the common portion of SerDes DC electrical specifications, which is the DC
requirement for SerDes reference Clocks. The SerDes data lane’s transmitter and receiver reference
circuits are also shown.
10.1
Signal Terms Definition
The SerDes utilizes differential signaling to transfer data across the serial link. This section defines terms
used in the description and specification of differential signals.
Figure 15 shows how the signals are defined. For illustration purpose, only one SerDes lane is used for
description. The figure shows waveform for either a transmitter output (TXn and TXn) or a receiver input
(RXn and RXn). Each signal swings between A Volts and B Volts where A > B.
Using this waveform, the definitions are as follows. To simplify illustration, the following definitions
assume that the SerDes transmitter and receiver operate in a fully symmetrical differential signaling
environment.
1. Single-Ended Swing
The transmitter output signals and the receiver input signals TXn, TXn, RXn and RXn each have
a peak-to-peak swing of A – B Volts. This is also referred as each signal wire’s Single-Ended
Swing.
2. Differential Output Voltage, VOD (or Differential Output Swing):
The Differential Output Voltage (or Swing) of the transmitter, VOD, is defined as the difference of
the two complimentary output voltages: VTXn – VTXn. The VOD value can be either positive or
negative.
3. Differential Input Voltage, VID (or Differential Input Swing):
The Differential Input Voltage (or Swing) of the receiver, VID, is defined as the difference of the
two complimentary input voltages: VRXn – VRXn. The VID value can be either positive or negative.
4. Differential Peak Voltage, VDIFFp
The peak value of the differential transmitter output signal or the differential receiver input signal
is defined as Differential Peak Voltage, VDIFFp = |A – B| Volts.
5. Differential Peak-to-Peak, VDIFFp-p
Since the differential output signal of the transmitter and the differential input signal of the receiver
each range from A – B to –(A – B) Volts, the peak-to-peak value of the differential transmitter
output signal or the differential receiver input signal is defined as Differential Peak-to-Peak
Voltage, VDIFFp-p = 2*VDIFFp = 2 * |(A – B)| Volts, which is twice of differential swing in
amplitude, or twice of the differential peak. For example, the output differential peak-peak voltage
can also be calculated as VTX-DIFFp-p = 2*|VOD|.
6. Differential Waveform
The differential waveform is constructed by subtracting the inverting signal (TXn, for example)
from the non-inverting signal (TXn, for example) within a differential pair. There is only one signal
trace curve in a differential waveform. The voltage represented in the differential waveform is not
referenced to ground. Refer to Figure 24 as an example for differential waveform.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
7. Common Mode Voltage, Vcm
The Common Mode Voltage is equal to one half of the sum of the voltages between each conductor
of a balanced interchange circuit and ground. In this example, for SerDes output, Vcm_out = (VTXn
+ VTXn )/2 = (A + B) / 2, which is the arithmetic mean of the two complimentary output voltages
within a differential pair. In a system, the common mode voltage may often differ from one
component’s output to the other’s input. Sometimes, it may be even different between the receiver
input and driver output circuits within the same component. It is also referred as the DC offset in
some occasion.
TXn or RXn
A Volts
Vcm = (A + B) / 2
TXn or RXn
B Volts
Differential Swing, VID or VOD = A – B
Differential Peak Voltage, VDIFFp = |A – B|
Differential Peak-Peak Voltage, VDIFFpp = 2*VDIFFp (not shown)
Figure 15. Differential Voltage Definitions for Transmitter or Receiver
To illustrate these definitions using real values, consider the case of a CML (Current Mode Logic)
transmitter that has a common mode voltage of 2.25 V and each of its outputs, TD and TD, has a swing
that goes between 2.5 V and 2.0 V. Using these values, the peak-to-peak voltage swing of each signal (TD
or TD) is 500 mV p-p, which is referred as the single-ended swing for each signal. In this example, since
the differential signaling environment is fully symmetrical, the transmitter output’s differential swing
(VOD) has the same amplitude as each signal’s single-ended swing. The differential output signal ranges
between 500 mV and –500 mV, in other words, VOD is 500 mV in one phase and –500 mV in the other
phase. The peak differential voltage (VDIFFp) is 500 mV. The peak-to-peak differential voltage (VDIFFp-p)
is 1000 mV p-p.
10.2
SerDes Reference Clocks
The SerDes reference clock inputs are applied to an internal PLL whose output creates the clock used by
the corresponding SerDes lanes. The SerDes reference clocks input is SD_REF_CLK and SD_REF_CLK
for PCI Express.
The following sections describe the SerDes reference clock requirements and some application
information.
10.2.1
SerDes Reference Clock Receiver Characteristics
Figure 16 shows a receiver reference diagram of the SerDes reference clocks.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
25
High-Speed Serial Interfaces (HSSI)
•
•
•
•
The supply voltage requirements for XCOREVDD are specified in Table 1 and Table 2.
SerDes reference clock receiver reference circuit structure
— The SD_REF_CLK and SD_REF_CLK are internally AC-coupled differential inputs as shown
in Figure 16. Each differential clock input (SD_REF_CLK or SD_REF_CLK) has a 50-Ω
termination to XCOREVSS followed by on-chip AC-coupling.
— The external reference clock driver must be able to drive this termination.
— The SerDes reference clock input can be either differential or single-ended. Refer to the
Differential Mode and Single-ended Mode description below for further detailed requirements.
The maximum average current requirement that also determines the common mode voltage range
— When the SerDes reference clock differential inputs are DC coupled externally with the clock
driver chip, the maximum average current allowed for each input pin is 8mA. In this case, the
exact common mode input voltage is not critical as long as it is within the range allowed by the
maximum average current of 8 mA (refer to the following bullet for more detail), since the
input is AC-coupled on-chip.
— This current limitation sets the maximum common mode input voltage to be less than 0.4 V
(0.4 V/50 = 8 mA) while the minimum common mode input level is 0.1 V above XCOREVSS.
For example, a clock with a 50/50 duty cycle can be produced by a clock driver with output
driven by its current source from 0mA to 16mA (0–0.8 V), such that each phase of the
differential input has a single-ended swing from 0 V to 800 mV with the common mode voltage
at 400mV.
— If the device driving the SD_REF_CLK and SD_REF_CLK inputs cannot drive 50 Ω to
XCOREVSS DC, or it exceeds the maximum input current limitations, then it must be
AC-coupled off-chip.
The input amplitude requirement
— This requirement is described in detail in the following sections.
50 Ω
SD_REF_CLK
Input
Amp
SD_REF_CLK
50 Ω
Figure 16. Receiver of SerDes Reference Clocks
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Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
10.2.2
DC Level Requirement for SerDes Reference Clocks
The DC level requirement for the MPC8308 SerDes reference clock inputs is different depending on the
signaling mode used to connect the clock driver chip and SerDes reference clock inputs as described
below.
• Differential Mode
— The input amplitude of the differential clock must be between 400 mV and 1600 mV
differential peak-peak (or between 200 mV and 800 mV differential peak). In other words,
each signal wire of the differential pair must have a single-ended swing less than 800 mV and
greater than 200 mV. This requirement is the same for both external DC-coupled or
AC-coupled connection.
— For external DC-coupled connection, as described in Section 10.2.1, “SerDes Reference
Clock Receiver Characteristics,” the maximum average current requirements sets the
requirement for average voltage (common mode voltage) to be between 100 mV and 400 mV.
Figure 17 shows the SerDes reference clock input requirement for DC-coupled connection
scheme.
— For external AC-coupled connection, there is no common mode voltage requirement for the
clock driver. Since the external AC-coupling capacitor blocks the DC level, the clock driver
and the SerDes reference clock receiver operate in different command mode voltages. The
SerDes reference clock receiver in this connection scheme has its common mode voltage set to
XCOREVSS. Each signal wire of the differential inputs is allowed to swing below and above
the common mode voltage (XCOREVSS). Figure 18 shows the SerDes reference clock input
requirement for AC-coupled connection scheme.
• Single-ended Mode
— The reference clock can also be single-ended. The SD_REF_CLK input amplitude
(single-ended swing) must be between 400 mV and 800 mV peak-peak (from Vmin to Vmax)
with SD_REF_CLK either left unconnected or tied to ground.
— The SD_REF_CLK input average voltage must be between 200 and 400 mV. Figure 19 shows
the SerDes reference clock input requirement for single-ended signaling mode.
— To meet the input amplitude requirement, the reference clock inputs might need to be DC or
AC-coupled externally. For the best noise performance, the reference of the clock could be DC
or AC-coupled into the unused phase (SD_REF_CLK) through the same source impedance as
the clock input (SD_REF_CLK) in use.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
27
High-Speed Serial Interfaces (HSSI)
SD_REF_CLK
200 mV < Input Amplitude or Differential Peak < 800mV
Vmax < 80 0mV
100 mV < Vcm < 400 mV
Vmin > 0 V
SD_REF_CLK
Figure 17. Differential Reference Clock Input DC Requirements (External DC-Coupled)
200mV < Input Amplitude or Differential Peak < 800mV
SD_REF_CLK
Vmax < Vcm + 400 mV
Vcm
Vmin > Vcm – 400 mV
SD_REF_CLK
Figure 18. Differential Reference Clock Input DC Requirements (External AC-Coupled)
400 mV < SD_REF_CLK Input Amplitude < 800 mV
SD_REF_CLK
0V
SD_REF_CLK
Figure 19. Single-Ended Reference Clock Input DC Requirements
10.2.3
Interfacing With Other Differential Signaling Levels
With on-chip termination to XCOREVSS, the differential reference clocks inputs are high-speed current
steering logic (HCSL)-compatible and DC-coupled.
Many other low voltage differential type outputs like low voltage differential signaling (LVDS) can be
used but may need to be AC-coupled due to the limited common mode input range allowed (100 to
400 mV) for DC-coupled connection.
LVPECL outputs can produce signal with too large amplitude and may need to be DC-biased at clock
driver output first, then followed with series attenuation resistor to reduce the amplitude, in addition to
AC-coupling.
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High-Speed Serial Interfaces (HSSI)
NOTE
Figure 20 to Figure 23 below are for conceptual reference only. Due to the
fact that clock driver chip's internal structure, output impedance and
termination requirements are different between various clock driver chip
manufacturers, it is very possible that the clock circuit reference designs
provided by clock driver chip vendor are different from what is shown
below. They might also vary from one vendor to the other. Therefore,
Freescale Semiconductor can neither provide the optimal clock driver
reference circuits, nor guarantee the correctness of the following clock
driver connection reference circuits. The system designer is recommended
to contact the selected clock driver chip vendor for the optimal reference
circuits with the MPC8308 SerDes reference clock receiver requirement
provided in this document.
Figure 20 shows the SerDes reference clock connection reference circuits for HCSL type clock driver. It
assumes that the DC levels of the clock driver chip is compatible with MPC8308 SerDes reference clock
input’s DC requirement.
MPC8308
HCSL CLK Driver Chip
CLK_Out
33 Ω
SD_REF_CLK
50 Ω
SerDes Refer.
CLK Receiver
100 Ω differential PWB trace
Clock Driver
33 Ω
CLK_Out
Total 50 Ω. Assume clock driver’s
output impedance is about 16 Ω.
SD_REF_CLK
50 Ω
Clock driver vendor dependent
source termination resistor
Figure 20. DC-Coupled Differential Connection with HCSL Clock Driver (Reference Only)
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
29
High-Speed Serial Interfaces (HSSI)
Figure 21 shows the SerDes reference clock connection reference circuits for LVDS type clock driver.
Since LVDS clock driver’s common mode voltage is higher than the MPC8308’s SerDes reference clock
input’s allowed range (100 to 400 mV), AC-coupled connection scheme must be used. It assumes the
LVDS output driver features 50-Ω termination resistor. It also assumes that the LVDS transmitter
establishes its own common mode level without relying on the receiver or other external component.
MPC8308
LVDS CLK Driver Chip
CLK_Out
10 nF
SD_REF_CLK
50 Ω
SerDes Refer.
CLK Receiver
100 Ω differential PWB trace
Clock Driver
CLK_Out
10 nF
SD_REF_CLK
50 Ω
Figure 21. AC-Coupled Differential Connection with LVDS Clock Driver (Reference Only)
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
Figure 22 shows the SerDes reference clock connection reference circuits for LVPECL type clock driver.
Since LVPECL driver’s DC levels (both common mode voltages and output swing) are incompatible with
MPC8308 SerDes reference clock input’s DC requirement, AC-coupling has to be used. Figure 22
assumes that the LVPECL clock driver’s output impedance is 50 Ω. R1 is used to DC-bias the LVPECL
outputs prior to AC-coupling. Its value could be ranged from 140 Ω to 240 Ω depending on clock driver
vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50-Ω termination
resistor to attenuate the LVPECL output’s differential peak level such that it meets the MPC8308’s SerDes
reference clock’s differential input amplitude requirement (between 200 mV and 800 mV differential
peak). For example, if the LVPECL output’s differential peak is 900 mV and the desired SerDes reference
clock input amplitude is selected as 600mV, the attenuation factor is 0.67, which requires R2 = 25 Ω.
Please consult clock driver chip manufacturer to verify whether this connection scheme is compatible with
a particular clock driver chip.
LVPECL CLK
Driver Chip
MPC8308
CLK_Out
R2
10nF
SD_REF_CLK
50 Ω
SerDes Refer.
CLK Receiver
R1 100 Ω differential PWB trace
Clock Driver
R2
10 nF
SD_REF_CLK
CLK_Out
R1
50 Ω
Figure 22. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only)
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
31
High-Speed Serial Interfaces (HSSI)
Figure 23 shows the SerDes reference clock connection reference circuits for a single-ended clock driver.
It assumes the DC levels of the clock driver are compatible with the device’s SerDes reference clock
input’s DC requirement.
Single-Ended
CLK Driver Chip
MPC8308
Total 50 Ω. Assume clock driver’s
output impedance is about 16 Ω.
Clock Driver
CLK_Out
50 Ω
SD_REF_CLK
33 Ω
SerDes Refer.
CLK Receiver
100 Ω differential PWB trace
50 Ω
SD_REF_CLK
50 Ω
Figure 23. Single-Ended Connection (Reference Only)
10.2.4
AC Requirements for SerDes Reference Clocks
The clock driver selected should provide a high quality reference clock with low phase noise and
cycle-to-cycle jitter. Phase noise less than 100 kHz can be tracked by the PLL and data recovery loops and
is less of a problem. Phase noise above 15 MHz is filtered by the PLL. The most problematic phase noise
occurs in the 1–15 MHz range. The source impedance of the clock driver should be 50 Ω to match the
transmission line and reduce reflections which are a source of noise to the system.
Table 32 describes some AC parameters for PCI Express protocol.
Table 32. SerDes Reference Clock AC Parameters
At recommended operating conditions with XCOREVDD= 1.0V ± 5%
Parameter
Symbol
Min
Max
Unit
Notes
Rising Edge Rate
Rise Edge Rate
1.0
4.0
V/ns
2, 3
Falling Edge Rate
Fall Edge Rate
1.0
4.0
V/ns
2, 3
Differential Input High Voltage
VIH
+200
—
mV
2
Differential Input Low Voltage
VIL
—
–200
mV
2
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
High-Speed Serial Interfaces (HSSI)
Table 32. SerDes Reference Clock AC Parameters (continued)
At recommended operating conditions with XCOREVDD= 1.0V ± 5%
Parameter
Rising edge rate (SD_REF_CLK) to falling edge rate
(SD_REF_CLK) matching
Symbol
Min
Max
Unit
Notes
Rise-Fall
Matching
—
20
%
1, 4
Notes:
1. Measurement taken from single ended waveform.
2. Measurement taken from differential waveform.
3. Measured from –200 mV to +200 mV on the differential waveform (derived from SD_REF_CLK minus SD_REF_CLK). The
signal must be monotonic through the measurement region for rise and fall time. The 400 mV measurement window is centered
on the differential zero crossing (Figure 24).
4. Matching applies to rising edge rate for SD_REF_CLK and falling edge rate for SD_REF_CLK. It is measured using a 200
mV window centered on the median cross point where SD_REF_CLK rising meets SD_REF_CLK falling. The median cross
point is used to calculate the voltage thresholds the oscilloscope is to use for the edge rate calculations. The Rise Edge Rate
of SD_REF_CLK should be compared to the Fall Edge Rate of SD_REF_CLK, the maximum allowed difference should not
exceed 20% of the slowest edge rate (See Figure 25).
VIH
=
+200
0.0 V
VIL = -200 mV
SD_REF_CLK
minus
SD_REF_CLK
Figure 24. Differential Measurement Points for Rise and Fall Time
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
SD_REF_CLK
Figure 25. Single-Ended Measurement Points for Rise and Fall Time Matching
The other detailed AC requirements of the SerDes reference clocks is defined by each interface protocol
based on application usage. For detailed information, see the following sections:
• Section 11.2, “AC Requirements for PCI Express SerDes Clocks”
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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PCI Express
10.2.4.1
Spread Spectrum Clock
SD_REF_CLK/SD_REF_CLK are not intended to be used with, and should not be clocked by, a spread
spectrum clock source.
10.3
SerDes Transmitter and Receiver Reference Circuits
Figure 26 shows the reference circuits for SerDes data lane’s transmitter and receiver.
TXn
RXn
50 Ω
50 Ω
Transmitter
Receiver
50 Ω
TXn
50 Ω
RXn
Figure 26. SerDes Transmitter and Receiver Reference Circuits
The DC and AC specification of SerDes data lanes are defined in Section 11, “PCI Express.”
Note that external AC Coupling capacitor is required for the PCI Express serial transmission protocol with
the capacitor value defined in specification of PCI Express protocol section.
11 PCI Express
This section describes the DC and AC electrical specifications for the PCI Express bus.
11.1
DC Requirements for PCI Express SD_REF_CLK and
SD_REF_CLK
For more information, see Section 10.2, “SerDes Reference Clocks.”
11.2
AC Requirements for PCI Express SerDes Clocks
Table 33 lists the PCI Express SerDes clock AC requirements.
Table 33. SD_REF_CLK and SD_REF_CLK AC Requirements
Symbol
Min
Typ
Max
Units
Notes
REFCLK cycle time (for 125 MHz and 100 MHz)
8
10
—
ns
—
tREFCJ
REFCLK cycle-to-cycle jitter. Difference in the period
of any two adjacent REFCLK cycles.
—
—
100
ps
—
tREFPJ
Phase jitter. Deviation in edge location with respect to
mean edge location.
–50
—
50
ps
—
tREF
Parameter Description
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
PCI Express
11.3
Clocking Dependencies
The ports on the two ends of a link must transmit data at a rate that is within 600 parts per million (ppm)
of each other at all times. This is specified to allow bit rate clock sources with a ±300 ppm tolerance.
11.4
Physical Layer Specifications
Following is a summary of the specifications for the physical layer of PCI Express on this device. For
further details as well as the specifications of the transport and data link layer please use the PCI Express
Base Specification, Rev. 1.0a.
11.4.1
Differential Transmitter (TX) Output
Table 34 defines the specifications for the differential output at all transmitters (TXs). The parameters are
specified at the component pins.
Table 34. Differential Transmitter (TX) Output Specifications
Parameter
Unit interval
Symbol
Comments
Min
Typical
Max
Units
Notes
UI
Each UPETX is 400 ps ±
300 ppm. UPETX does not
account for Spread
Spectrum Clock dictated
variations.
399.88
400
400.12
ps
1
VPEDPPTX = 2*|VTX-D+ VTX-D-|
0.8
—
1.2
V
2
Differential peak-to-peak
output voltage
VTX-DIFFp-p
De-Emphasized
differential output voltage
(ratio)
VTX-DE-RATIO
Ratio of the VPEDPPTX of
the second and following
bits after a transition
divided by the VPEDPPTX
of the first bit after a
transition.
–3.0
–3.5
–4.0
dB
2
TTX-EYE
The maximum Transmitter
jitter can be derived as
TTX-MAX-JITTER = 1 UPEEWTX= 0.3 UI.
0.70
—
—
UI
2, 3
—
—
0.15
UI
2, 3
Minimum TX eye width
TTX-EYE-MEDIAN-t Jitter is defined as the
measurement variation of
othe crossing points
MAX-JITTER
(VPEDPPTX = 0 V) in
relation to a recovered TX
UI. A recovered TX UI is
calculated over 3500
consecutive unit intervals
of sample data. Jitter is
measured using all edges
of the 250 consecutive UI
in the center of the 3500
UI used for calculating the
TX UI.
Maximum time between
the jitter median and
maximum deviation from
the median
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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PCI Express
Table 34. Differential Transmitter (TX) Output Specifications (continued)
Parameter
Symbol
Comments
Min
Typical
Max
Units
Notes
D+/D- TX output rise/fall
time
TTX-RISE,
TTX-FALL
—
0.125
—
—
UI
2, 5
RMS AC peak common
mode output voltage
VTX-CM-ACp
VPEACPCMTX =
RMS(|VTXD+ + VTXD-|/2 VTX-CM-DC)
VTX-CM-DC = DC(avg) of
|VTX-D+ + VTX-D-|/2
—
—
20
mV
2
Absolute delta of DC
common mode voltage
during L0 and electrical
idle
VTX-CM-DC-
|VTX-CM-DC (during L0) VTX-CM-Idle-DC (During
Electrical Idle)|<=100 mV
VTX-CM-DC = DC(avg) of
|VTX-D+ + VTX-D-|/2 [L0]
VTX-CM-Idle-DC = DC(avg) of
|VTX-D+ + VTX-D-|/2
[Electrical Idle]
0
—
100
mV
2
VTX-CM-DC-LINE- |VTX-CM-DC-D+ VTX-CM-DC-D-| <= 25 mV
DELTA
VTX-CM-DC-D+ = DC(avg) of
|VTX-D+|
VTX-CM-DC-D- = DC(avg) of
|VTX-D-|
0
—
25
mV
2
0
—
20
mV
2
—
600
—
mV
6
Absolute delta of DC
common mode between
D+ and D–
Electrical idle differential
peak output voltage
ACTIVEIDLE-DELTA
VTX-IDLE-DIFFp
VPEEIDPTX = |VTX-IDLE-D+
-VTX-IDLE-D-| <= 20 mV
Amount of voltage change VTX-RCV-DETECT The total amount of
allowed during receiver
voltage change that a
detection
transmitter can apply to
sense whether a low
impedance Receiver is
present.
TX DC common mode
voltage
VTX-DC-CM
The allowed DC Common
Mode voltage under any
conditions.
—
3.6
—
V
6
TX short circuit current
limit
ITX-SHORT
The total current the
Transmitter can provide
when shorted to its ground
—
—
90
mA
—
Minimum time spent in
electrical idle
TTX-IDLE-MIN
Minimum time a
Transmitter must be in
Electrical Idle Utilized by
the Receiver to start
looking for an Electrical
Idle Exit after successfully
receiving an Electrical Idle
ordered set
50
—
—
UI
—
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PCI Express
Table 34. Differential Transmitter (TX) Output Specifications (continued)
Parameter
Symbol
Min
Typical
Max
Units
Notes
TTX-IDLE-SET-TO-I After sending an Electrical
Idle ordered set, the
DLE
Transmitter must meet all
Electrical Idle
Specifications within this
time. This is considered a
debounce time for the
Transmitter to meet
Electrical Idle after
transitioning from L0.
—
—
20
UI
—
Maximum time to
TTX-IDLE-TO-DIFFtransition to valid TX
DATA
specifications after leaving
an electrical idle condition
Maximum time to meet all
TX specifications when
transitioning from
Electrical Idle to sending
differential data. This is
considered a debounce
time for the TX to meet all
TX specifications after
leaving Electrical Idle
—
—
20
UI
—
Differential return loss
RLTX-DIFF
Measured over 50 MHz to
1.25 GHz.
12
—
—
dB
4
Common mode return
loss
RLTX-CM
Measured over 50 MHz to
1.25 GHz.
6
—
—
dB
4
ZTX-DIFF-DC
TX DC Differential mode
Low Impedance
80
100
120
Ω
—
ZTX-DC
Required TX D+ as well as
D- DC Impedance during
all states
40
—
—
Ω
—
LTX-SKEW
Static skew between any
two Transmitter Lanes
within a single Link
—
—
500 + 2
UI
ps
—
CTX
All Transmitters shall be
AC coupled. The AC
coupling is required either
within the media or within
the transmitting
component itself. An
external capacitor of
100nF is recommended.
75
—
200
nF
—
Maximum time to
transition to a valid
electrical idle after
sending an electrical idle
ordered set
DC differential TX
impedance
Transmitter DC
impedance
Lane-to-Lane output skew
AC coupling capacitor
Comments
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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PCI Express
Table 34. Differential Transmitter (TX) Output Specifications (continued)
Parameter
Symbol
Comments
Min
Typical
Max
Units
Notes
Crosslink random timeout
Tcrosslink
This random timeout helps
resolve conflicts in
crosslink configuration by
eventually resulting in only
one Downstream and one
Upstream Port.
0
—
1
ms
7
Notes:
1. No test load is necessarily associated with this value.
2. Specified at the measurement point into a timing and voltage compliance test load as shown in Figure 29 and measured over
any 250 consecutive TX UIs. (Also refer to the transmitter compliance eye diagram shown in Figure 27.)
3. A TTX-EYE = 0.70 UI provides for a total sum of deterministic and random jitter budget of TTX-JITTER-MAX = 0.30 UI for the
transmitter collected over any 250 consecutive TX UIs. The TTX-EYE-MEDIAN-to-MAX-JITTER median is less than half of the total
TX jitter budget collected over any 250 consecutive TX UIs. It should be noted that the median is not the same as the mean.
The jitter median describes the point in time where the number of jitter points on either side is approximately equal as
opposed to the averaged time value.
4. The transmitter input impedance shall result in a differential return loss greater than or equal to 12 dB and a common mode
return loss greater than or equal to 6 dB over a frequency range of 50 MHz to 1.25 GHz. This input impedance requirement
applies to all valid input levels. The reference impedance for return loss measurements is 50 Ω to ground for both the D+ and
D– line (that is, as measured by a vector network analyzer with 50-Ω probes, see Figure 29). Note that the series capacitors,
CTX, is optional for the return loss measurement.
5. Measured between 20%–80% at transmitter package pins into a test load as shown in Figure 29 for both VTX-D+ and VTX-D-.
6. See Section 4.3.1.8 of the PCI Express Base Specifications, Rev 1.0a.
7. See Section 4.2.6.3 of the PCI Express Base Specifications, Rev 1.0a.
11.4.2
Transmitter Compliance Eye Diagrams
The TX eye diagram in Figure 27 is specified using the passive compliance/test measurement load
(Figure 29) in place of any real PCI Express interconnect + RX component. There are two eye diagrams
that must be met for the transmitter. Both diagrams must be aligned in time using the jitter median to locate
the center of the eye diagram. The different eye diagrams differ in voltage depending on whether it is a
transition bit or a de-emphasized bit. The exact reduced voltage level of the de-emphasized bit is always
relative to the transition bit.
The eye diagram must be valid for any 250 consecutive UIs.
A recovered TX UI is calculated over 3500 consecutive unit intervals of sample data. The eye diagram is
created using all edges of the 250 consecutive UI in the center of the 3500 UI used for calculating the TX
UI.
NOTE
It is recommended that the recovered TX UI be calculated using all edges in
the 3500 consecutive UI interval with a fit algorithm using a minimization
merit function (that is, least squares and median deviation fits).
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
38
Freescale Semiconductor
PCI Express
VTX-DIFF = 0 mV
(D+ D– Crossing Point)
VTX-DIFF = 0 mV
(D+ D– Crossing Point)
[Transition Bit]
VTX-DIFFp-p-MIN = 800 mV
[De-emphasized Bit]
566 mV (3 dB) >= VTX-DIFFp-p-MIN >= 505 mV (4 dB)
0.7 UI = UI – 0.3 UI(JTX-TOTAL-MAX)
[Transition Bit]
VTX-DIFFp-p-MIN = 800 mV
Figure 27. Minimum Transmitter Timing and Voltage Output Compliance Specifications
11.4.3
Differential Receiver (RX) Input Specifications
Table 35 defines the specifications for the differential input at all receivers (RXs). The parameters are
specified at the component pins.
Table 35. Differential Receiver (RX) Input Specifications
Parameter
Unit interval
Differential peak-to-peak
output voltage
Minimum receiver eye
width
Symbol
Comments
Min
Typical
Max
Units
Notes
UI
Each UPERX is 400 ps ±
300 ppm. UPERX does not
account for Spread
Spectrum Clock dictated
variations.
399.88
400
400.12
ps
1
VRX-DIFFp-p
VPEDPPRX = 2*|VRX-D+ VRX-D-|
0.175
—
1.200
V
2
TRX-EYE
The maximum
interconnect media and
Transmitter jitter that can
be tolerated by the
Receiver can be derived
as TRX-MAX-JITTER = 1 UPEEWRX= 0.6 UI.
0.4
—
—
UI
2, 3
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
39
PCI Express
Table 35. Differential Receiver (RX) Input Specifications (continued)
Parameter
Maximum time between
the jitter median and
maximum deviation from
the median.
Symbol
Comments
TRX-EYE-MEDIAN-t Jitter is defined as the
measurement variation of
o-MAX-JITTER
the crossing points
(VPEDPPRX = 0 V) in
relation to a recovered TX
UI. A recovered TX UI is
calculated over 3500
consecutive unit intervals
of sample data. Jitter is
measured using all edges
of the 250 consecutive UI
in the center of the 3500
UI used for calculating the
TX UI.
Min
Typical
Max
Units
Notes
—
—
0.3
UI
2, 3, 7
VRX-CM-ACp
VPEACPCMRX = |VRXD+ +
VRXD-|/2 - VRX-CM-DC
VRX-CM-DC = DC(avg) of
|VRX-D+ + VRX-D-|/2
—
—
150
mV
2
Differential return loss
RLRX-DIFF
Measured over 50 MHz to
1.25 GHz with the D+ and
D- lines biased at +300
mV and -300 mV,
respectively.
15
—
—
dB
4
Common mode return
loss
RLRX-CM
Measured over 50 MHz to
1.25 GHz with the D+ and
D- lines biased at 0 V.
6
—
—
dB
4
DC differential input
impedance
ZRX-DIFF-DC
RX DC differential mode
impedance.
80
100
120
Ω
5
DC Input Impedance
ZRX-DC
Required RX D+ as well
as D- DC Impedance (50
± 20% tolerance).
40
50
60
Ω
2, 5
—
—
Ω
AC peak common mode
input voltage
Powered down DC input
impedance
ZRX-HIGH-IMP-DC Required RX D+ as well
as D- DC Impedance
when the Receiver
terminations do not have
power.
200 k
Electrical idle detect
threshold
VRX-IDLE-DET-DIF VPEEIDT = 2*|VRX-D+
-VRX-D-|
Fp-p
Measured at the package
pins of the Receiver
65
Unexpected Electrical Idle TRX-IDLE-DET-DIFF An unexpected Electrical
Idle (Vrx-diffp-p <
Enter Detect Threshold
Vrx-idle-det-diffp-p) must
Integration Time
ENTERTIME
be recognized no longer
than
Trx-idle-det-diff-entertime
to signal an unexpected
idle condition.
—
6
—
175
mV
—
—
10
ms
—
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
40
Freescale Semiconductor
PCI Express
Table 35. Differential Receiver (RX) Input Specifications (continued)
Parameter
Total Skew
Symbol
Comments
Min
Typical
Max
Units
LRX-SKEW
Skew across all lanes on a
Link. This includes
variation in the length of
SKP ordered set (for
example, COM and one to
five SKP Symbols) at the
RX as well as any delay
differences arising from
the interconnect itself.
—
—
20
ns
Notes
—
Notes:
1. No test load is necessarily associated with this value.
2. Specified at the measurement point and measured over any 250 consecutive UIs. The test load in Figure 29 should be used
as the RX device when taking measurements (also refer to the receiver compliance eye diagram shown in Figure 28). If the
clocks to the RX and TX are not derived from the same reference clock, the TX UI recovered from 3500 consecutive UI must
be used as a reference for the eye diagram.
3. A TRX-EYE = 0.40 UI provides for a total sum of 0.60 UI deterministic and random jitter budget for the transmitter and
interconnect collected any 250 consecutive UIs. The TRX-EYE-MEDIAN-to-MAX-JITTER specification ensures a jitter distribution in
which the median and the maximum deviation from the median is less than half of the total. UI jitter budget collected over any
250 consecutive TX UIs. It should be noted that the median is not the same as the mean. The jitter median describes the point
in time where the number of jitter points on either side is approximately equal as opposed to the averaged time value. If the
clocks to the RX and TX are not derived from the same reference clock, the TX UI recovered from 3500 consecutive UI must
be used as the reference for the eye diagram.
4. The receiver input impedance shall result in a differential return loss greater than or equal to 15 dB with the D+ line biased to
300 mV and the D– line biased to –300 mV and a common mode return loss greater than or equal to 6 dB (no bias required)
over a frequency range of 50 MHz to 1.25 GHz. This input impedance requirement applies to all valid input levels. The
reference impedance for return loss measurements for is 50 Ω to ground for both the D+ and D– line (that is, as measured by
a vector network analyzer with 50-Ω probes, see Figure 29). Note that the series capacitors, CTX, is optional for the return
loss measurement.
5. Impedance during all LTSSM states. When transitioning from a fundamental reset to detect (the initial state of the LTSSM)
there is a 5 ms transition time before receiver termination values must be met on all unconfigured lanes of a port.
6. The RX DC common mode impedance that exists when no power is present or fundamental reset is asserted. This helps
ensure that the receiver detect circuit does not falsely assume a receiver is powered on when it is not. This term must be
measured at 300 mV above the RX ground.
7. It is recommended that the recovered TX UI is calculated using all edges in the 3500 consecutive UI interval with a fit algorithm
using a minimization merit function. Least squares and median deviation fits have worked well with experimental and
simulated data.
11.5
Receiver Compliance Eye Diagrams
The RX eye diagram in Figure 28 is specified using the passive compliance/test measurement load
(Figure 29) in place of any real PCI Express RX component. In general, the minimum receiver eye diagram
measured with the compliance/test measurement load (Figure 29) is larger than the minimum receiver eye
diagram measured over a range of systems at the input receiver of any real PCI Express component. The
degraded eye diagram at the input Receiver is due to traces internal to the package as well as silicon
parasitic characteristics which cause the real PCI Express component to vary in impedance from the
compliance/test measurement load. The input receiver eye diagram is implementation specific and is not
specified. RX component designer should provide additional margin to adequately compensate for the
degraded minimum Receiver eye diagram (shown in Figure 28) expected at the input receiver based on an
adequate combination of system simulations and the return loss measured looking into the RX package
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
41
PCI Express
and silicon. The RX eye diagram must be aligned in time using the jitter median to locate the center of the
eye diagram.
The eye diagram must be valid for any 250 consecutive UIs.
A recovered TX UI is calculated over 3500 consecutive unit intervals of sample data. The eye diagram is
created using all edges of the 250 consecutive UI in the center of the 3500 UI used for calculating the TX
UI.
NOTE
The reference impedance for return loss measurements is 50 Ω to ground for
both the D+ and D- line (that is, as measured by a Vector Network Analyzer
with 50 Ω probes—see Figure 29). Note that the series capacitors,
CPEACCTX, are optional for the return loss measurement.
VRX-DIFF = 0 mV
(D+ D– Crossing Point)
VRX-DIFF = 0 mV
(D+ D– Crossing Point)
VRX-DIFFp-p-MIN > 175 mV
0.4 UI = TRX-EYE-MIN
Figure 28. Minimum Receiver Eye Timing and Voltage Compliance Specification
11.5.1
Compliance Test and Measurement Load
The AC timing and voltage parameters must be verified at the measurement point, as specified within
0.2 inches of the package pins, into a test/measurement load shown in Figure 29.
NOTE
The allowance of the measurement point to be within 0.2 inches of the
package pins is meant to acknowledge that package/board routing may
benefit from D+ and D– not being exactly matched in length at the package
pin boundary.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
42
Freescale Semiconductor
Enhanced Local Bus
Figure 29. Compliance Test/Measurement Load
12 Enhanced Local Bus
This section describes the DC and AC electrical specifications for the enhanced local bus interface.
12.1
Enhanced Local Bus DC Electrical Characteristics
Table 36 provides the DC electrical characteristics for the local bus interface.
Table 36. Local Bus DC Electrical Characteristics at 3.3 V
Parameter
Symbol
Min
Max
Unit
High-level input voltage
VIH
2.0
NVDD + 0.3
V
Low-level input voltage
VIL
–0.3
0.8
V
Input current, (VIN1 = 0 V or VIN = LVDD)
IIN
—
±5
μA
High-level output voltage, (LVDD = min, IOH = –2 mA)
VOH
NVDD – 0.2
—
V
Low-level output voltage, (LVDD = min, IOH = 2 mA)
VOL
—
0.2
V
Note: The parameters stated in above table are valid for all revisions unless explicitly mentioned.
12.2
Enhanced Local Bus AC Electrical Specifications
Table 37 describes the general timing parameters of the local bus interface.
Table 37. Local Bus General Timing Parameters
Symbol 1
Min
Max
Unit
Notes
tLBK
15
—
ns
2
Input setup to local bus clock (Note: to be revisited)
tLBIVKH
7
—
ns
3, 4
Input hold from local bus clock (Note: to be revisited)
tLBIXKH
1
—
ns
3, 4
Parameter
Local bus cycle time
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
43
Enhanced Local Bus
Table 37. Local Bus General Timing Parameters (continued)
Symbol 1
Min
Max
Unit
Notes
Local bus clock to output valid (Note: to be revisited)
tLBKHOV
—
3
ns
3
Local bus clock to output high impedance for LD (Note: to be
revisited)
tLBKHOZ
—
4
ns
5
Parameter
Notes:
1. The symbols used for timing specifications follow the pattern of t(First two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(First two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tLBIXKH1 symbolizes local bus
timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes high (H), in this case
for clock one(1).
2. All timings are in reference to falling edge of LCLK0 (for all outputs and for LGTA and LUPWAIT inputs) or rising edge of
LCLK0 (for all other inputs).
3. All signals are measured from NVDD/2 of the rising/falling edge of LCLK0 to 0.4 × NVDD of the signal in question for 3.3-V
signaling levels.
4. Input timings are measured at the pin.
5. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered
through the component pin is less than or equal to the leakage current specification.
Figure 30 provides the AC test load for the local bus.
Output
Z0 = 50 Ω
RL = 50 Ω
NVDD/2
Figure 30. Local Bus AC Test Load
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
44
Freescale Semiconductor
Enhanced Local Bus
Figure 31 through Figure 33 show the local bus signals.
In what follows, T1,T2,T3,T4 are internal clock reference phase signals corresponding to
LCCR[CLKDIV].
LCLK0
tLBIVKH
Input Signals:
LD[0:15]
tLBIVKH
tLBIXKH
tLBIXKH
Input Signal:
LGTA
tLBIXKH
Output Signals:
LBCTL//LOE/
tLBKHOV
tLBKHOV
tLBKHOZ
Output Signals:
LA[0:25]
Figure 31. Local Bus Signals, Non-Special Signals Only
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
45
Enhanced Local Bus
LCLK0
T1
T3
tLBKHOV
tLBKHOZ
GPCM Mode Output Signals:
LCS[0:3]/LWE
tLBIVKH
tLBIXKH
UPM Mode Input Signal:
LUPWAIT
tLBIXKH
tLBIVKH
Input Signals:
LD[0:15]
tLBKHOV
tLBKHOZ
UPM Mode Output Signals:
LCS[0:3]/LBS[0:1]/LGPL[0:5]
Figure 32. Local Bus Signals, GPCM/UPM Signals for LCCR[CLKDIV] = 2
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
46
Freescale Semiconductor
Enhanced Secure Digital Host Controller (eSDHC)
LCLK
T1
T2
T3
T4
tLBKHOV
tLBKHOZ
GPCM Mode Output Signals:
LCS[0:3]/LWE
tLBIXKH
tLBIVKH
UPM Mode Input Signal:
LUPWAIT
tLBIXKH
tLBIVKH
Input Signals:
LD[0:15]
tLBKHOV
tLBKHOZ
UPM Mode Output Signals:
LCS[0:3]/LBS[0:1]/LGPL[0:5]
Figure 33. Local Bus Signals, GPCM/UPM Signals for LCCR[CLKDIV] = 4
13 Enhanced Secure Digital Host Controller (eSDHC)
This section describes the DC and AC electrical specifications for the eSDHC (SD/MMC/SDIO) interface
of the MPC8308.
The eSDHC controller always uses the falling edge of the SD_CLK in order to drive the
SD_DAT[0:3]/CMD as outputs and rising edge to sample the SD_DAT[0:3], CMD, CD and WP as inputs.
This behavior is true for both full and high speed modes.
13.1
eSDHC DC Electrical Characteristics
Table 38 provides the DC electrical characteristics for the eSDHC (SD/MMC) interface of the device,
compatible with SDHC specifications. The eSDHC NVDD range is between 3.0 V and 3.6 V.
Table 38. eSDHC interface DC Electrical Characteristics
Characteristic
Symbol
Condition
Min
Max
Unit
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
47
Enhanced Secure Digital Host Controller (eSDHC)
Table 38. eSDHC interface DC Electrical Characteristics (continued)
Characteristic
13.2
Symbol
Condition
Min
Max
Unit
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
eSDHC AC Timing Specifications (Full Speed Mode)
This section describes the AC electrical specifications for the eSDHC (SD/MMC) interface of the device.
Table 39 provides the eSDHC AC timing specifications for full speed mode as defined in Figure 35 and
Figure 36.
Table 39. eSDHC AC Timing Specifications for Full Speed Mode
At recommended operating conditions NVDD = 3.3 V ± 300 mV.
Symbol 1
Min
Max
Unit
Notes
SD_CLK clock frequency—full speed mode
fSFSCK
0
25
MHz
—
SD_CLK clock cycle
tSFSCK
40
—
ns
—
SD_CLK clock frequency—identification mode
fSIDCK
0
400
kHz
—
SD_CLK clock low time
tSFSCKL
15
—
ns
2
SD_CLK clock high time
tSFSCKH
15
—
ns
2
SD_CLK clock rise and fall times
tSFSCKR/
tSFSCKF
—
5
ns
2
Input setup times: SD_CMD, SD_DATx to SD_CLK
tSFSIVKH
3
—
ns
2
Input hold times: SD_CMD, SD_DATx to SD_CLK
tSFSIXKH
2
—
ns
2
Output valid: SD_CLK to SD_CMD, SD_DATx valid
tSFSKHOV
—
3
ns
2
Output hold: SD_CLK to SD_CMD, SD_DATx valid
tSFSKHOX
–3
—
—
—
SD card input setup
tISU
5
—
ns
3
SD card input hold
tIH
5
—
ns
3
SD card output valid
tODLY
—
14
ns
3
SD card output hold
tOH
0
—
ns
3
Parameter
Note:
The symbols used for timing specifications herein follow the pattern of t(first three letters of functional block)(signal)(state) (reference)(state)
for inputs and t(first three letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tSFSIXKH symbolizes eSDHC
full mode speed device timing (SFS) input (I) to go invalid (X) with respect to the clock reference (K) going to high (H). Also
tSFSKHOV symbolizes eSDHC full speed timing (SFS) for the clock reference (K) to go high (H), with respect to the output (O)
going valid (V) or data output valid time. Note that, in general, the clock reference symbol representation is based on five letters
representing the clock of a particular functional. For rise and fall times, the latter convention is used with the appropriate letter:
R (rise) or F (fall).
2
Measured at capacitive load of 40 pF.
3 For reference only, according to the SD card specifications.
4 Average, for reference only.
1
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
48
Freescale Semiconductor
Enhanced Secure Digital Host Controller (eSDHC)
Figure 34 provides the eSDHC clock input timing diagram.
eSDHC
External Clock
operational mode
VM
VM
VM
tSFSCKL
tSFSCKH
tSFSCK
VM = Midpoint Voltage (NVDD/2)
tSFSCKR
tSFSCKF
Figure 34. eSDHC Clock Input Timing Diagram
13.2.1
Full Speed Output Path (Write)
Figure 35 provides the data and command output timing diagram.
tSFSCK (Clock Cycle)
SD CLK at the
MPC8308 Pin
Driving
Edge
tCLK_DELAY
SD CLK at
the Card Pin
Sampling
Edge
Output Valid Time: tSFSKHOV
Output Hold Time: tSFSKHOX
Output from the
MPC8308 Pins
tSFSCKL
Input at the
MPC8308 Pins
tDATA_DELAY
tIH (5 ns)
tISU (5 ns)
Figure 35. Full Speed Output Path
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
49
Enhanced Secure Digital Host Controller (eSDHC)
13.2.2
Full Speed Input Path (Read)
Figure 36 provides the data and command input timing diagram.
tSFSCK (Clock Cycle)
SD CLK at the
MPC8308 Pin
Sampling
Edge
tCLK_DELAY
SD CLK at
the Card Pin
Driving
Edge
tODLY
tOH
tDATA_DELAY
Output from the
SD Card Pins
Input at the
MPC8308 Pins
tSFSIXKH
tSFSIVKH
(MPC8308 Input Hold)
Figure 36. Full Speed Input Path
13.3
eSDHC AC Timing Specifications
Table 40 provides the eSDHC AC timing specifications.
Table 40. eSDHC AC Timing Specifications for High Speed Mode
At recommended operating conditions NVDD = 3.3 V ± 300 mV.
Symbol 1
Min
Max
Unit
Notes
SD_CLK clock frequency—high speed mode
fSHSCK
0
50
MHz
3
SD_CLK clock cycle
tSHSCK
20
—
ns
—
SD_CLK clock frequency—identification mode
fSIDCK
0
400
kHz
—
SD_CLK clock low time
tSHSCKL
7
—
ns
2
SD_CLK clock high time
tSHSCKH
7
—
ns
2
SD_CLK clock rise and fall times
tSHSCKR/
tSHSCKF
—
3
ns
2
Input setup times: SD_CMD, SD_DATx
tSHSIVKH
3
—
ns
2
Input hold times: SD_CMD, SD_DATx
tSHSIXKH
2
—
ns
2
Output delay time: SD_CLK to SD_CMD, SD_DATx valid
tSHSKHOV
3
—
ns
2
Output Hold time: SD_CLK to SD_CMD, SD_DATx invalid
tSHSKHOX
–3
—
ns
2
SD Card Input Setup
tISU
6
—
ns
3
SD Card Input Hold
tIH
2
—
ns
3
Parameter
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
50
Freescale Semiconductor
Enhanced Secure Digital Host Controller (eSDHC)
Table 40. eSDHC AC Timing Specifications for High Speed Mode (continued)
At recommended operating conditions NVDD = 3.3 V ± 300 mV.
Symbol 1
Min
Max
Unit
Notes
SD Card Output Valid
tODLY
—
14
ns
3
SD Card Output Hold
tOH
2.5
—
ns
3
Parameter
Note:
1
The symbols used for timing specifications herein follow the pattern of t(first three letters of functional block)(signal)(state) (reference)(state)
for inputs and t(first three letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tSFSIXKH symbolizes eSDHC
full mode speed device timing (SFS) input (I) to go invalid (X) with respect to the clock reference (K) going to high (H). Also
tSFSKHOV symbolizes eSDHC full speed timing (SFS) for the clock reference (K) to go high (H), with respect to the output (O)
going valid (V) or data output valid time. Note that, in general, the clock reference symbol representation is based on five
letters representing the clock of a particular functional. For rise and fall times, the latter convention is used with the appropriate
letter: R (rise) or F (fall).
2
Measured at capacitive load of 40 pF.
3 For reference only, according to the SD card specifications.
Figure 37 provides the eSDHC clock input timing diagram.
eSDHC
External Clock
operational mode
VM
VM
VM
tSHSCKL
tSHSCKH
tSHSCK
VM = Midpoint Voltage (NVDD/2)
tSHSCKR
tSHSCKF
Figure 37. eSDHC Clock Input Timing Diagram
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
51
Enhanced Secure Digital Host Controller (eSDHC)
13.3.1
High Speed Output Path (Write)
Figure 38 provides the data and command output timing diagram.
tSHSCK (Clock Cycle)
SD CLK at the
MPC8308 Pin
Driving
Edge
tCLK_DELAY
SD CLK at
the Card Pin
Sampling
Edge
Output Valid Time: tSHSKHOV
tSHSCKL
Output Hold Time: tSHSKHOX
Output from the
MPC8308 Pins
Input at the
SD Card Pins
tDATA_DELAY
tIH (2 ns)
tISU (6 ns)
Figure 38. High Speed Output Path
13.3.2
High Speed Input Path (Read)
Figure 39 provides the data and command input timing diagram.
tSHSCK (Clock Cycle)
1/2 Cycle
SD CLK at the
MPC8308 Pin
Sampling
Edge
tCLK_DELAY
SD CLK at
the Card Pin
Driving
Edge
tODLY
tOH
tDATA_DELAY
Output from the
SD Card Pins
Input at the
MPC8308 Pins
tSHSIVKH
(MPC8308 Input
(MPC8308 Input
tSHSIXKH
Figure 39. High Speed Input Path
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
52
Freescale Semiconductor
JTAG
14 JTAG
This section describes the DC and AC electrical specifications for the IEEE Std 1149.1™ (JTAG)
interface.
14.1
JTAG DC Electrical Characteristics
Table 41 provides the DC electrical characteristics for the IEEE 1149.1 (JTAG) interface.
Table 41. JTAG Interface DC Electrical Characteristics
Characteristic
14.2
Symbol
Condition
Min
Max
Unit
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
—
±5
μA
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
JTAG AC Timing Specifications
This section describes the AC electrical specifications for the IEEE 1149.1 (JTAG) interface.
Table 42 provides the JTAG AC timing specifications as defined in Figure 41 through Figure 44.
Table 42. JTAG AC Timing Specifications (Independent of SYS_CLK_IN) 1
At recommended operating conditions (see Table 2).
Symbol2
Min
Max
Unit
Notes
JTAG external clock frequency of operation
fJTG
0
33.3
MHz
—
JTAG external clock cycle time
t JTG
30
—
ns
—
tJTKHKL
15
—
ns
—
tJTGR & tJTGF
0
2
ns
—
tTRST
25
—
ns
3
Boundary-scan data
TMS, TDI
tJTDVKH
tJTIVKH
4
4
—
—
Boundary-scan data
TMS, TDI
tJTDXKH
tJTIXKH
10
10
—
—
Boundary-scan data
TDO
tJTKLDV
tJTKLOV
2
2
11
11
Parameter
JTAG external clock pulse width measured at 1.4 V
JTAG external clock rise and fall times
TRST assert time
ns
Input setup times:
Input hold times:
4
ns
4
ns
Valid times:
5
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
53
JTAG
Table 42. JTAG AC Timing Specifications (Independent of SYS_CLK_IN) 1 (continued)
At recommended operating conditions (see Table 2).
Symbol2
Min
Max
Unit
Notes
Boundary-scan data
TDO
tJTKLDX
tJTKLOX
2
2
—
—
ns
5
JTAG external clock to output high impedance:
Boundary-scan data
TDO
tJTKLDZ
tJTKLOZ
2
2
19
9
ns
5, 6
Parameter
Output hold times:
Notes:
1. All outputs are measured from the midpoint voltage of the falling/rising edge of tTCLK to the midpoint of the signal in question.
The output timings are measured at the pins. All output timings assume a purely resistive 50-Ω load (see Figure 40).
Time-of-flight delays must be added for trace lengths, vias, and connectors in the system.
2. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tJTDVKH symbolizes JTAG device
timing (JT) with respect to the time data input signals (D) reaching the valid state (V) relative to the tJTG clock reference (K)
going to the high (H) state or setup time. Also, tJTDXKH symbolizes JTAG timing (JT) with respect to the time data input signals
(D) went invalid (X) relative to the tJTG clock reference (K) going to the high (H) state. Note that, in general, the clock reference
symbol representation is based on three letters representing the clock of a particular functional. For rise and fall times, the
latter convention is used with the appropriate letter: R (rise) or F (fall).
3. TRST is an asynchronous level sensitive signal. The setup time is for test purposes only.
4. Non-JTAG signal input timing with respect to tTCLK.
5. Non-JTAG signal output timing with respect to tTCLK.
6. Guaranteed by design and characterization.
Figure 40 provides the AC test load for TDO and the boundary-scan outputs.
Z0 = 50 Ω
Output
RL = 50 Ω
NVDD/2
Figure 40. AC Test Load for the JTAG Interface
Figure 41 provides the JTAG clock input timing diagram.
JTAG
External Clock
VM
VM
VM
tJTGR
tJTKHKL
tJTG
tJTGF
VM = Midpoint Voltage (NVDD/2)
Figure 41. JTAG Clock Input Timing Diagram
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
JTAG
Figure 42 provides the TRST timing diagram.
TRST
VM
VM
tTRST
VM = Midpoint Voltage (NVDD/2)
Figure 42. TRST Timing Diagram
Figure 43 provides the boundary-scan timing diagram.
JTAG
External Clock
VM
VM
tJTDVKH
tJTDXKH
Boundary
Data Inputs
Input
Data Valid
tJTKLDV
tJTKLDX
Boundary
Data Outputs
Output Data Valid
tJTKLDZ
Boundary
Data Outputs
Output Data Valid
VM = Midpoint Voltage (NVDD/2)
Figure 43. Boundary-Scan Timing Diagram
Figure 44 provides the test access port timing diagram.
JTAG
External Clock
VM
VM
tJTIVKH
tJTIXKH
Input
Data Valid
TDI, TMS
tJTKLOV
tJTKLOX
Output Data Valid
TDO
tJTKLOZ
TDO
Output Data Valid
VM = Midpoint Voltage (NVDD/2)
Figure 44. Test Access Port Timing Diagram
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
55
I2 C
15 I2C
This section describes the DC and AC electrical characteristics for the I2C interface.
15.1
I2C DC Electrical Characteristics
Table 43 provides the DC electrical characteristics for the I2C interface.
Table 43. I2C DC Electrical Characteristics
At recommended operating conditions with NVDD of 3.3 V ± 0.3 V.
Parameter
Symbol
Min
Max
Unit Notes
Input high voltage level
VIH
0.7 × NVDD
NVDD + 0.3
V
—
Input low voltage level
VIL
–0.3
0.3 × NVDD
V
—
Low level output voltage
VOL
0
0.2 × NVDD
V
1
High level output voltage
VOH
0.8 x NVDD
NVDD + 0.3
V
—
Output fall time from VIH(min) to VIL(max) with a bus capacitance from 10
to 400 pF
tI2KLKV 20 + 0.1 × CB
250
ns
2
Pulse width of spikes which must be suppressed by the input filter
tI2KHKL
0
50
ns
3
Capacitance for each I/O pin
CI
—
10
pF
—
Input current, (0 V ≤VIN ≤ NVDD)
IIN
—
±5
μA
—
Notes:
1. Output voltage (open drain or open collector) condition = 3 mA sink current.
2. CB = capacitance of one bus line in pF.
3. For information on the digital filter used, see the MPC8308 PowerQUICC II Pro Processor Reference Manual.
15.2
I2C AC Electrical Specifications
Table 44 provides the AC timing parameters for the I2C interface.
Table 44. I2C AC Electrical Specifications
All values refer to VIH (min) and VIL (max) levels (see Table 43).
Symbol1
Min
Max
Unit
SCL clock frequency
fI2C
0
400
kHz
Low period of the SCL clock
tI2CL
1.3
—
μs
High period of the SCL clock
tI2CH
0.6
—
μs
Setup time for a repeated START condition
tI2SVKH
0.6
—
μs
Hold time (repeated) START condition (after this period, the first clock pulse is generated)
tI2SXKL
0.6
—
μs
Data setup time
tI2DVKH
100
—
ns
Data hold time:
tI2DXKL
—
02
—
0.9 3
—
300
Parameter
μs
I2C bus devices
Fall time of both SDA and SCL signals5
tI2CF
ns
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Freescale Semiconductor
I2 C
Table 44. I2C AC Electrical Specifications (continued)
All values refer to VIH (min) and VIL (max) levels (see Table 43).
Symbol1
Min
Max
Unit
Setup time for STOP condition
tI2PVKH
0.6
—
μs
Bus free time between a STOP and START condition
tI2KHDX
1.3
—
μs
Noise margin at the LOW level for each connected device (including hysteresis)
VNL
0.1 × NVDD
—
V
Noise margin at the HIGH level for each connected device (including hysteresis)
VNH
0.2 × NVDD
—
V
Parameter
Notes:
1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state) (reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tI2DVKH symbolizes I2C timing (I2)
with respect to the time data input signals (D) reach the valid state (V) relative to the tI2C clock reference (K) going to the high
(H) state or setup time. Also, tI2SXKL symbolizes I2C timing (I2) for the time that the data with respect to the start condition (S)
went invalid (X) relative to the tI2C clock reference (K) going to the low (L) state or hold time. Also, tI2PVKH symbolizes I2C timing
(I2) for the time that the data with respect to the stop condition (P) reaching the valid state (V) relative to the tI2C clock reference
(K) going to the high (H) state or setup time. For rise and fall times, the latter convention is used with the appropriate letter: R
(rise) or F (fall).
2. The device provides a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL signal) to bridge the
undefined region of the falling edge of SCL.
3. The maximum tI2DXKL has only to be met if the device does not stretch the LOW period (tI2CL) of the SCL signal.
4. CB = capacitance of one bus line in pF.
5. The device does not follow the I2C-BUS Specifications, Version 2.1, regarding the tI2CF AC parameter.
Figure 45 provides the AC test load for the I2C.
Output
Z0 = 50 Ω
RL = 50 Ω
NVDD/2
Figure 45. I2C AC Test Load
Figure 46 shows the AC timing diagram for the I2C bus.
SDA
tI2CF
tI2DVKH
tI2CL
tI2KHKL
tI2SXKL
tI2CF
tI2CR
SCL
tI2SXKL
tI2CH
tI2DXKL
S
tI2SVKH
tI2PVKH
Sr
P
S
Figure 46. I2C Bus AC Timing Diagram
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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57
Timers
16 Timers
This section describes the DC and AC electrical specifications for the timers.
16.1
Timers DC Electrical Characteristics
Table 45 provides the DC electrical characteristics for the MPC8308 timers pins, including TIN, TOUT,
and TGATE.
Table 45. Timers DC Electrical Characteristics
Characteristic
16.2
Symbol
Condition
Min
Max
Unit
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
0 V ≤ VIN ≤ NVDD
—
±5
μA
Timers AC Timing Specifications
Table 46 provides the Timers input and output AC timing specifications.
Table 46. Timers Input AC Timing Specifications
Characteristic
Timers inputs—minimum pulse width
Symbol1
Min
Unit
tTIWID
20
ns
Notes:
1. Timers inputs and outputs are asynchronous to any visible clock. Timers outputs should be synchronized before use by any
external synchronous logic. Timers inputs are required to be valid for at least tTIWID ns to ensure proper operation
Figure 47 provides the AC test load for the Timers.
Output
Z0 = 50 Ω
RL = 50 Ω
NVDD/2
Figure 47. Timers AC Test Load
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GPIO
17 GPIO
This section describes the DC and AC electrical specifications for the GPIO of MPC8308
17.1
GPIO DC Electrical Characteristics
Table 47 provides the DC electrical characteristics for the GPIO.
Table 47. GPIO DC Electrical Characteristic
Characteristic
17.2
Symbol
Condition
Min
Max
Unit
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
0 V ≤ VIN ≤ NVDD
—
±5
μA
GPIO AC Timing Specifications
Table 48 provides the GPIO input and output AC timing specifications.
Table 48. GPIO Input AC Timing Specifications
Characteristic
GPIO inputs—minimum pulse width
Symbol1
Min
Unit
tPIWID
20
ns
Notes:
1. GPIO inputs and outputs are asynchronous to any visible clock. GPIO outputs should be synchronized
before use by any external synchronous logic. GPIO inputs are required to be valid for at least tPIWID ns to
ensure proper operation.
Figure 48 provides the AC test load for the GPIO.
Output
Z0 = 50 Ω
RL = 50 Ω
NVDD/2
Figure 48. GPIO AC Test Load
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
59
IPIC
18 IPIC
This section describes the DC and AC electrical specifications for the external interrupt pins.
18.1
IPIC DC Electrical Characteristics
Table 49 provides the DC electrical characteristics for the external interrupt pins.
Table 49. IPIC DC Electrical Characteristics
Characteristic
18.2
Symbol
Condition
Min
Max
Unit
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
—
—
±5
μA
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
IPIC AC Timing Specifications
Table 50 provides the IPIC input and output AC timing specifications.
Table 50. IPIC Input AC Timing Specifications
Characteristic
IPIC inputs—minimum pulse width
Symbol1
Min
Unit
tPIWID
20
ns
Notes:
1. IPIC inputs and outputs are asynchronous to any visible clock. IPIC outputs should be synchronized
before use by any external synchronous logic. IPIC inputs are required to be valid for at least tPIWID ns
to ensure proper operation when working in edge triggered mode.
19 SPI
This section describes the DC and AC electrical specifications for the SPI of the device.
19.1
SPI DC Electrical Characteristics
Table 51 provides the DC electrical characteristics for the MPC8308 SPI.
Table 51. SPI DC Electrical Characteristics
Characteristic
Symbol
Condition
Min
Max
Unit
Input high voltage
VIH
—
2.1
NVDD + 0.3
V
Input low voltage
VIL
—
–0.3
0.8
V
Input current
IIN
0 V ≤ VIN ≤ NVDD
—
±5
μA
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SPI
Table 51. SPI DC Electrical Characteristics (continued)
Characteristic
19.2
Symbol
Condition
Min
Max
Unit
Output high voltage
VOH
IOH = –8.0 mA
2.4
—
V
Output low voltage
VOL
IOL = 8.0 mA
—
0.5
V
Output low voltage
VOL
IOL = 3.2 mA
—
0.4
V
SPI AC Timing Specifications
Table 52 and provide the SPI input and output AC timing specifications.
Table 52. SPI AC Timing Specifications 1
Symbol 2
Min
Max
Unit
SPI outputs valid—master mode (internal clock) delay
tNIKHOV
—
6
ns
SPI outputs hold—master mode (internal clock) delay
tNIKHOX
0.5
—
ns
SPI outputs valid—slave mode (external clock) delay
tNEKHOV
8.5
ns
SPI outputs hold—slave mode (external clock) delay
tNEKHOX
2
—
ns
SPI inputs—master mode (internal clock) input setup time
tNIIVKH
6
—
ns
SPI inputs—master mode (internal clock) input hold time
tNIIXKH
0
—
ns
SPI inputs—slave mode (external clock) input setup time
tNEIVKH
4
—
ns
SPI inputs—slave mode (external clock) input hold time
tNEIXKH
2
—
ns
Characteristic
Notes:
1. Output specifications are measured from the 50% level of the rising edge of SPICLK to the 50% level of the signal. Timings
are measured at the pin.
2. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for
inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tNIKHOX symbolizes the internal
timing (NI) for the time SPICLK clock reference (K) goes to the high state (H) until outputs (O) are invalid (X).
Figure 49 provides the AC test load for the SPI.
Output
Z0 = 50 Ω
RL = 50 Ω
NVDD/2
Figure 49. SPI AC Test Load
Figure 50 through Figure 51 represent the AC timing from Table 52. Note that although the specifications
generally reference the rising edge of the clock, these AC timing diagrams also apply when the falling edge
is the active edge.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Package and Pin Listings
Figure 50 shows the SPI timing in slave mode (external clock).
SPICLK (input)
Input Signals:
SPIMOSI
(See Note)
tNEIVKH
tNEIXKH
tNEKHOV
Output Signals:
SPIMISO
(See Note)
Note: The clock edge is selectable on SPI.
Figure 50. SPI AC Timing in Slave Mode (External Clock) Diagram
Figure 51 shows the SPI timing in master mode (internal clock).
SPICLK (output)
Input Signals:
SPIMISO
(See Note)
tNIIVKH
Output Signals:
SPIMOSI
(See Note)
tNIIXKH
tNIKHOV
Note: The clock edge is selectable on SPI.
Figure 51. SPI AC Timing in Master Mode (Internal Clock) Diagram
20 Package and Pin Listings
This section details package parameters, pin assignments, and dimensions. The MPC8308 is available in
a Moulded Array Process Ball Grid Array (MAPBGA). For information on the MAPBGA, see
Section 20.1, “Package Parameters for the MPC8308 MAPBGA,” and Section 20.2, “Mechanical
Dimensions of the MPC8308 MAPBGA.”
20.1
Package Parameters for the MPC8308 MAPBGA
The package parameters are as provided in the following list. The package type is 19 mm × 19 mm, 473
MAPBGA.
Package outline
19 mm × 19 mm
Interconnects
473
Pitch
0.80 mm
Module height (typical)
1.39 mm
Solder Balls
96.5 Sn/ 3.5Ag
Ball diameter (typical)
0.40 mm
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Package and Pin Listings
20.2
Mechanical Dimensions of the MPC8308 MAPBGA
Figure 52 shows the mechanical dimensions and bottom surface nomenclature of the MAPBGA package.
Figure 52. Mechanical Dimension and Bottom Surface Nomenclature of the MPC8308 MAPBG
Notes:
1. All dimensions are in millimeters.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Package and Pin Listings
2. Dimensions and tolerances per ASME Y14.5M-1994.
3. Maximum solder ball diameter measured parallel to datum A.
4. Datum A, the seating plane, is determined by the spherical crowns of the solder balls.
20.3
Pinout Listings
Table 53 provides the pin-out listing for the MPC8308, MAPBGA package.
Table 53. MPC8308 Pinout Listing
Signal
Package Pin Number
Pin Type
Power
Supply
Notes
DDR Memory Controller Interface
MEMC_MDQ[0]
V6
I/O
GVDDA
—
MEMC_MDQ[1]
Y4
I/O
GVDDA
—
MEMC_MDQ[2]
AB3
I/O
GVDDA
—
MEMC_MDQ[3]
AA3
I/O
GVDDA
—
MEMC_MDQ[4]
AA2
I/O
GVDDA
—
MEMC_MDQ[5]
AA1
I/O
GVDDA
—
MEMC_MDQ[6]
W4
I/O
GVDDA
—
MEMC_MDQ[7]
Y2
I/O
GVDDA
—
MEMC_MDQ[8]
W3
I/O
GVDDA
—
MEMC_MDQ[9]
W1
I/O
GVDDA
—
MEMC_MDQ[10]
Y1
I/O
GVDDA
—
MEMC_MDQ[11]
W2
I/O
GVDDA
—
MEMC_MDQ[12]
U4
I/O
GVDDA
—
MEMC_MDQ[13]
U3
I/O
GVDDA
—
MEMC_MDQ[14]
V4
I/O
GVDDA
—
MEMC_MDQ[15]
U6
I/O
GVDDA
—
MEMC_MDQ[16]
T3
I/O
GVDDB
—
MEMC_MDQ[17]
T2
I/O
GVDDB
—
MEMC_MDQ[18]
R4
I/O
GVDDB
—
MEMC_MDQ[19]
R3
I/O
GVDDB
—
MEMC_MDQ[20]
P4
I/O
GVDDB
—
MEMC_MDQ[21]
N6
I/O
GVDDB
—
MEMC_MDQ[22]
P2
I/O
GVDDB
—
MEMC_MDQ[23]
P1
I/O
GVDDB
—
MEMC_MDQ[24]
N4
I/O
GVDDB
—
MEMC_MDQ[25]
N3
I/O
GVDDB
—
MEMC_MDQ[26]
N2
I/O
GVDDB
—
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Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
MEMC_MDQ[27]
M6
I/O
GVDDB
—
MEMC_MDQ[28]
M2
I/O
GVDDB
—
MEMC_MDQ[29]
M3
I/O
GVDDB
—
MEMC_MDQ[30]
L2
I/O
GVDDB
—
MEMC_MDQ[31]
L3
I/O
GVDDB
—
MEMC_MDM[0]
AB2
O
GVDDA
—
MEMC_MDM[1]
V3
O
GVDDA
—
MEMC_MDM[2]
P3
O
GVDDB
—
MEMC_MDM[3]
M7
O
GVDDB
—
MEMC_MDM[8]
K2
O
GVDDB
—
MEMC_MDQS[0]
AC3
I/O
GVDDA
—
MEMC_MDQS[1]
V1
I/O
GVDDA
—
MEMC_MDQS[2]
R1
I/O
GVDDB
—
MEMC_MDQS[3]
M1
I/O
GVDDB
—
MEMC_MDQS[8]
K1
I/O
GVDDB
—
MEMC_MBA[0]
C3
O
GVDDB
—
MEMC_MBA[1]
B2
O
GVDDB
—
MEMC_MBA[2]
H4
O
GVDDB
—
MEMC_MA0
C2
O
GVDDB
—
MEMC_MA1
D2
O
GVDDB
—
MEMC_MA2
D3
O
GVDDB
—
MEMC_MA3
D4
O
GVDDB
—
MEMC_MA4
E4
O
GVDDB
—
MEMC_MA5
F4
O
GVDDB
—
MEMC_MA6
E2
O
GVDDB
—
MEMC_MA7
E1
O
GVDDB
—
MEMC_MA8
F2
O
GVDDB
—
MEMC_MA9
F3
O
GVDDB
—
MEMC_MA10
C1
O
GVDDB
—
MEMC_MA11
F7
O
GVDDB
—
MEMC_MA12
G2
O
GVDDB
—
MEMC_MA13
G3
O
GVDDB
—
MEMC_MWE
D5
O
GVDDB
—
MEMC_MRAS
B4
O
GVDDB
—
Signal
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
MEMC_MCAS
C5
O
GVDDB
—
MEMC_MCS[0]
B6
O
GVDDB
—
MEMC_MCS[1]
C6
O
GVDDB
—
MEMC_MCKE
H3
O
GVDDB
3
MEMC_MCK [0]
A3
O
GVDDB
—
MEMC_MCK [1]
U2
O
GVDDB
—
MEMC_MCK [2]
G1
O
GVDDB
—
MEMC_MCK [0]
A4
O
GVDDB
—
MEMC_MCK [1]
U1
O
GVDDB
—
MEMC_MCK [2]
H1
O
GVDDB
—
MEMC_MODT[0]
A5
O
GVDDB
—
MEMC_MODT[1]
B5
O
GVDDB
—
MEMC_MECC[0]
L4
I/O
GVDDB
—
MEMC_MECC[1]
L6
I/O
GVDDB
—
MEMC_MECC[2]
K4
I/O
GVDDB
—
MEMC_MECC[3]
K3
I/O
GVDDB
—
MEMC_MECC[4]
J2
I/O
GVDDB
—
MEMC_MECC[5]
K6
I/O
GVDDB
—
MEMC_MECC[6]
J3
I/O
GVDDB
—
MEMC_MECC[7]
J6
I/O
GVDDB
—
MVREF
G6
I
GVDDB
—
Signal
Local Bus Controller Interface
LD0
U18
I/O
NVDDP_K
8
LD1
V18
I/O
NVDDP_K
8
LD2
U16
I/O
NVDDP_K
8
LD3
Y20
I/O
NVDDP_K
8
LD4
AA21
I/O
NVDDP_K
8
LD5
AC22
I/O
NVDDP_K
8
LD6
V17
I/O
NVDDP_K
8
LD7
AB21
I/O
NVDDP_K
8
LD8
Y19
I/O
NVDDP_K
8
LD9
AA20
I/O
NVDDP_K
8
LD10
Y17
I/O
NVDDP_K
8
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
66
Freescale Semiconductor
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
LD11
AC21
I/O
NVDDP_K
8
LD12
AB20
I/O
NVDDP_K
8
LD13
V16
I/O
NVDDP_K
8
LD14
AA19
I/O
NVDDP_K
8
LD15
AC17
I/O
NVDDP_K
8
LA0
AC20
O
NVDDP_K
—
LA1
Y16
O
NVDDP_K
—
LA2
U15
O
NVDDP_K
—
LA3
V15
O
NVDDP_K
—
LA4
AA18
O
NVDDP_K
—
LA5
AA17
O
NVDDP_K
—
LA6
AC19
O
NVDDP_K
—
LA7
AA16
O
NVDDP_K
—
LA8
AB18
O
NVDDP_K
—
LA9
AC18
O
NVDDP_K
—
LA10
V14
O
NVDDP_K
—
LA11
AB17
O
NVDDP_K
—
LA12
AA15
O
NVDDP_K
—
LA13
AC16
O
NVDDP_K
—
LA14
Y14
O
NVDDP_K
—
LA15
AC15
O
NVDDP_K
—
LA16
U13
O
NVDDP_K
—
LA17
V13
O
NVDDP_K
—
LA18
Y13
O
NVDDP_K
—
LA19
AB15
O
NVDDP_K
—
LA20
AA14
O
NVDDP_K
—
LA21
AB14
O
NVDDP_K
—
LA22
U12
O
NVDDP_K
—
LA23
V12
O
NVDDP_K
—
LA24
Y12
O
NVDDP_K
—
LA25
AC14
O
NVDDP_K
—
LCS[0]
AA13
O
NVDDP_K
4
LCS[1]
AB13
O
NVDDP_K
4
LCS[2]
AA12
O
NVDDP_K
4
Signal
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
67
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
Y11
O
NVDDP_K
4
LWE[0] /LFWE0/LBS0
AB11
O
NVDDP_K
—
LWE[1]/LBS1
AC11
O
NVDDP_K
—
LBCTL
U11
O
NVDDP_K
—
LGPL0/LFCLE
Y10
O
NVDDP_K
—
LGPL1/LFALE
AA10
O
NVDDP_K
—
LGPL2/LOE/LFRE
AB10
O
NVDDP_K
4
LGPL3/LFWP
AC10
O
NVDDP_K
—
LGPL4/LGTA/LUPWAIT/LFRB
AB9
I/O
NVDDP_K
4
LGPL5
Y9
O
NVDDP_K
—
LCLK0
AC12
O
NVDDP_K
—
UART_SOUT1/MSRCID0/LSRCID0
C17
O
NVDDB
—
UART_SIN1/MSRCID1/LSRCID1
B18
I/O
NVDDB
—
UART_SOUT2/MSRCID2/LSRCID2
D17
O
NVDDB
—
UART_SIN2/MSRCID3/LSRCID3
D18
I/O
NVDDB
—
TXA
C14
O
XPADVDD
—
TXA
C15
O
XPADVDD
—
RXA
A13
I
XCOREVDD
—
RXA
B13
I
XCOREVDD
—
SD_IMP_CAL_RX
A15
I
XCOREVDD
—
SD_REF_CLK
C12
I
XCOREVDD
—
SD_REF_CLK
D12
I
XCOREVDD
—
SD_PLL_TPD
F13
O
—
—
SD_IMP_CAL_TX
A11
I
XPADVDD
—
SD_PLL_TPA_ANA
F11
O
—
—
SDAVDD_0
G12
I
—
—
SDAVSS_0
F12
I
—
—
IIC_SDA1
C9
I/O
NVDDA
2
IIC_SCL1
A9
I/O
NVDDA
2
Signal
LCS[3]
DUART
PEX PHY
I2C interface
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
68
Freescale Semiconductor
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
IIC_SDA2/CKSTOP_OUT
D10
I/O
NVDDA
2
IIC_SCL2/CKSTOP_IN
C10
I/O
NVDDA
2
IRQ[0]/MCP_IN
A17
I
NVDDB
—
IRQ[1]/MCP_OUT
F16
I/O
NVDDB
—
IRQ[2] /CKSTOP_OUT
B17
I/O
NVDDB
—
IRQ[3] /CKSTOP_IN
A18
I
NVDDB
—
TCK
Y7
I
NVDDP_K
—
TDI
U9
I
NVDDP_K
4
TDO
AC5
O
NVDDP_K
3
TMS
AA6
I
NVDDP_K
4
TRST
V8
I
NVDDP_K
4
AC6
I
NVDDP_K
5
HRESET
AA9
I/O
NVDDP_K
1
PORESET
AA8
I
NVDDP_K
—
SRESET
AB7
I/O
NVDDP_K
—
SYS_CLK_IN
AC8
I
NVDDP_K
—
RTC_PIT_CLOCK
AA23
I
NVDDJ
—
QUIESCE
AA7
O
NVDDP_K
—
THERM0
AC7
I
NVDDP_K
6
TSEC1_COL
B20
I
NVDDC
—
TSEC1_CRS
B21
I
NVDDC
—
TSEC1_GTX_CLK
F18
O
NVDDC
3
TSEC1_RX_CLK
A22
I
NVDDC
—
TSEC1_RX_DV
D21
I
NVDDC
—
TSEC1_RXD[3]
C22
I
NVDDC
—
Signal
Interrupts
JTAG
TEST
TEST_MODE
System Control
Clocks
MISC
ETSEC1
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
69
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
TSEC1_RXD[2]
C21
I
NVDDC
—
TSEC1_RXD[1]
C20
I
NVDDC
—
TSEC1_RXD[0]
D20
I
NVDDC
—
TSEC1_RX_ER
C23
I
NVDDC
—
TSEC1_TX_CLK/TSEC1_GTX_CLK125
E23
I
NVDDC
—
TSEC1_TXD[3]/CFG_RESET_SOURCE[0]
F22
I/O
NVDDC
—
TSEC1_TXD[2]/CFG_RESET_SOURCE[1]
F21
I/O
NVDDC
—
TSEC1_TXD[1]/CFG_RESET_SOURCE[2]
E21
I/O
NVDDC
—
TSEC1_TXD[0]/CFG_RESET_SOURCE[3]
D22
I/O
NVDDC
—
TSEC1_TX_EN/LBC_PM_REF_10
F20
O
NVDDC
—
TSEC1_TX_ER/LB_POR_CFG_BOOT_ECC
E22
I/O
NVDDC
7
TSEC1_MDC
A20
O
NVDDB
—
TSEC1_MDIO
C19
I/O
NVDDB
2
SD_CLK/GPIO_16
D7
O
NVDDA
—
SD_CMD/GPIO_17
G9
I/O
NVDDA
—
SD_CD/GTM1_TIN1/GPIO_18
A7
I
NVDDA
—
SD_WP/GTM1_TGATE1/GPIO_19
D8
I
NVDDA
—
SD_DAT[0]/GTM1_TOUT1/GPIO_20
C8
I/O
NVDDA
—
SD_DAT[1]/GTM1_TOUT2/GPIO_21
B8
I/O
NVDDA
—
SD_DAT[2]/GTM1_TIN2/GPIO_22
A8
I/O
NVDDA
—
SD_DAT[3]/GTM1_TGATE2/GPIO_23
B9
I/O
NVDDA
—
AB5
I/O
NVDDP_K
—
Y6
I/O
NVDDP_K
—
SPICLK
AA5
I/O
NVDDP_K
—
SPISEL
AB4
I
NVDDP_K
—
GPIO[0]/TSEC2_COL
G21
I/O
NVDDF
—
GPIO[1]/TSEC2_TX_ER
K23
I/O
NVDDF
—
GPIO[2]/TSEC2_GTX_CLK
H18
I/O
NVDDF
—
GPIO[3]/TSEC2_RX_CLK
G23
I/O
NVDDF
—
Signal
Ethernet Mgmt
eSDHC/GTM
SPI
SPIMOSI/MSRCID4/LSRCID4
SPIMISO/MDVAL/LDVAL
GPIO/ETSEC2
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
70
Freescale Semiconductor
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
GPIO[4]/TSEC2_RX_DV
J18
I/O
NVDDF
—
GPIO[5]/TSEC2_RXD3
J20
I/O
NVDDF
—
GPIO[6]/TSEC2_RXD2
H22
I/O
NVDDF
—
GPIO[7]/TSEC2_RXD1
H21
I/O
NVDDF
—
GPIO[8]/TSEC2_RXD0
H20
I/O
NVDDF
—
GPIO[9]/TSEC2_RX_ER
J21
I/O
NVDDF
—
GPIO[10]/TSEC2_TX_CLK/TSEC2_GTX_CLK125
J23
I/O
NVDDF
—
GPIO[11]/TSEC2_TXD3
K22
I/O
NVDDF
—
GPIO[12]/TSEC2_TXD2
K20
I/O
NVDDF
—
GPIO[13]/TSEC2_TXD1
K18
I/O
NVDDF
—
GPIO[14]/TSEC2_TXD0
J17
I/O
NVDDF
—
GPIO[15]/TSEC2_TX_EN
K21
I/O
NVDDF
—
Signal
USB/IEEE1588/GTM
USBDR_PWR_FAULT
P20
I
NVDDH
—
USBDR_CLK
R23
I
NVDDH
—
USBDR_DIR
R21
I
NVDDH
—
USBDR_NXT
P18
I
NVDDH
—
USBDR_TXDRXD0
T22
I/O
NVDDH
—
USBDR_TXDRXD1
T21
I/O
NVDDH
—
USBDR_TXDRXD2
U23
I/O
NVDDH
—
USBDR_TXDRXD3
U22
I/O
NVDDH
—
USBDR_TXDRXD4
T20
I/O
NVDDH
—
USBDR_TXDRXD5
R18
I/O
NVDDH
—
USBDR_TXDRXD6
V23
I/O
NVDDH
—
USBDR_TXDRXD7
V22
I/O
NVDDH
—
USBDR_PCTL0
R17
O
NVDDH
—
USBDR_PCTL1
U20
O
NVDDH
—
USBDR_STP
V21
O
NVDDH
—
TSEC_TMR_CLK/ GPIO[8]
W23
I
NVDDH
—
GTM1_TOUT3/ GPIO[9]
T18
O
NVDDH
—
GTM1_TOUT4/ GPIO[10]
V20
O
NVDDH
—
TSEC_TMR_TRIG1/ GPIO[11]
W21
I
NVDDH
—
TSEC_TMR_TRIG2/ GPIO[12]
Y21
I
NVDDH
—
TSEC_TMR_GCLK
L17
O
NVDDG
—
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
71
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
TSEC_TMR_PP1
L18
O
NVDDG
—
TSEC_TMR_PP2
L21
O
NVDDG
—
TSEC_TMR_PP3/ GPIO[13]
L22
O
NVDDG
—
TSEC_TMR_ALARM1
L23
O
NVDDG
—
TSEC_TMR_ALARM2/ GPIO[14]
M23
O
NVDDG
—
GPIO[7]
M22
O
—
—
TSEC2_CRS
M21
O
NVDDG
—
TSEC1_TMR_RX_ESFD/ GPIO[1]
M18
O
NVDDG
—
TSEC1_TMR_TX_ESFD/GPIO[2]
M20
O
NVDDG
—
TSEC0_TMR_RX_ESFD/GPIO[3]
N23
O
NVDDG
—
TSEC0_TMR_TX_ESFD/ GPIO[4]
N21
O
NVDDG
—
GTM1_TGATE3
N20
I
NVDDG
—
GTM1_TIN4
N18
I
NVDDG
—
GTM1_TGATE4/ GPIO[15]
P23
I
NVDDG
—
GTM1_TIN3
P22
I
NVDDG
—
GPIO[5]
N17
I
NVDDH
—
GPIO[6]
P21
I
NVDDH
—
Signal
Power and Ground Supplies
AVDD1
R6
I
—
—
AVDD2
V10
I
—
—
Y23, B11, B16, D16
—
—
—
H8, H9, H10, H14,
H15, H16, J8, J16, K8,
K16, L8, L16, M8, M16,
N8, N16, P8, P16, R8,
R16, T8, T9, T10, T11,
T12, T13, T14, T15,
T16
I
—
—
NC, No Connection
VDD
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
72
Freescale Semiconductor
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
A2, A21, B1, B19, B23,
C4, C16, D6, D19, E3,
F8, F15, F17, F23, G7,
G8, G10, G15, G16,
G17, G20, H2, H6, H7,
H17, H23, J7, J9, J10,
J11, J12, J13, J14,
J15, K9, K10, K11,
K12, K13, K14, K15,
L1, L7, L9, L10, L11,
L12, L13, L14, L15,
L20, M4, M9, M10,
M11, M12, M13, M14,
M15, N9, N10, N11,
N12, N13, N14, N15,
P6, P7, P9, P10, P11,
P12, P13, P14, P15,
R2, R7, R9, R10, R11,
R12, R13, R14, R15,
R22, T6, T7, U8, U17,
U21, V2, V7, V9, V11,
W20, Y8, Y15, AA4,
AB1, AB6, AB12,
AB19, AC2, AC9, AC23
I
—
—
NVDDA
B7, B10, C7, D9, F9
I
—
—
NVDDB
A16, A19, C18
I
—
—
NVDDC
A23, B22, D23, E20,
G18
I
—
—
NVDDF
G22, J22, K17
I
—
—
NVDDG
M17, N22
I
—
—
NVDDH
P17, R20, T17, T23,
W22, Y22
I
—
—
NVDDJ
AB23, AA22
I
—
—
U10, U14, Y5, Y18,
AA11, AB8, AB16,
AB22, AC4,
AC13
I
—
—
A1, A6, B3, D1, F1, F6,
G4, J1, J4, K7, N1, N7,
T1, T4, U7, Y3, AC1
I
—
—
XPADVDD
D15, F10, F14
I
—
—
XPADVSS
A10, B15, D14, G13,
G14, H12
I
—
—
Signal
VSS
NVDDP_K
GVDD
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
73
Package and Pin Listings
Table 53. MPC8308 Pinout Listing (continued)
Package Pin Number
Pin Type
Power
Supply
Notes
XCOREVDD
A14, B12, C13
I
—
—
XCOREVSS
A12, B14, C11, D11,
D13, G11, H11, H13
I
—
—
Signal
Notes:
1. This pin is an open drain signal. A weak pull-up resistor (1 kΩ) should be placed on this pin to NVDD
2. This pin is an open drain signal. A weak pull-up resistor (2–10 kΩ) should be placed on this pin to NVDD.
3. This output is actively driven during reset rather than being three-stated during reset.
4. This pin has weak internal pull-up that is always enabled. 5. This pin must always be tied to VSS.
6. Internal thermally sensitive resistor, resistor value varies linearly with temperature. Useful for determining the junction
temperature.
7. The LB_POR_CFG_BOOT_ECC is sampled only during the PORESET negation. This pin with an internal pull down resistor
enables the ECC by default. To disable the ECC an external strong pull up resistor or a buffer released to high impedance
is needed.
8. This pin has weak internal pull-down that is always enabled
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
74
Freescale Semiconductor
Clocking
21 Clocking
Figure 53 shows the internal distribution of clocks within the device.
MPC8308
e300 Core
x M1
e300
PLL
csb_clk
clk tree
x L2
System
PLL
ref
Clk
Gen
ddr_clk
lbc_clk
fb
SYS_CLK_IN
eSHDC
DDR
Memory
Device
Local
Bus
Memory
Device
Protocol
Converter
SD_REF_CLK
SD_REF_CLK_B
eTSEC1
TSEC1_RX_CLK
+
-
125/100 MHz
2
MCK[0:2]
PCI Express
PCVTR Mux
1
MCK[0:2]
/n
LBC
Clock
Divider
24–66 MHz
SD_CLK
DDR
Clock
Divider
/2
PLL
SerDes PHY
TSEC1_TX_CLK/
TSEC1_GTX_CLK125
Multiplication factor M = 1, 1.5, 2, 2.5, and 3. Value is decided by RCWLR[COREPLL].
Multiplication factor L = 2, 3, 4, 5 and 6. Value is decided by RCWLR[SPMF].
Figure 53. MPC8308 Clock Subsystem
The following external clock sources are utilized on the MPC8308:
• System clock (SYS_CLK_IN)
• Ethernet Clock (TSEC1_RX_CLK/TSEC1_TX_CLK/TSEC1_GTX_CLK125 for eTSEC)
• SerDes PHY clock
• eSHDC clock (SD_CLK)
For more information, see the SerDes chapter in the MPC8308 PowerQUICC II Pro Processor
Reference Manual.
All clock inputs can be supplied using an external canned oscillator, a clock generation chip, or some other
source that provides a standard CMOS square wave input.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
Freescale Semiconductor
75
Clocking
21.1
System Clock Domains
The primary clock input (SYS_CLK_IN) frequency is multiplied up by the system phase-locked loop
(PLL) and the clock unit to create three major clock domains:
• The coherent system bus clock (csb_clk)
• The internal clock for the DDR controller (ddr_clk)
• The internal clock for the local bus interface unit (lbc_clk)
The csb_clk frequency is derived as follows:
csb_clk = [SYS_CLK_IN] × SPMF
The csb_clk serves as the clock input to the e300 core. A second PLL inside the core multiplies up the
csb_clk frequency to create the internal clock for the core (core_clk). The system and core PLL multipliers
are selected by the SPMF and COREPLL fields in the reset configuration word low (RCWL), which is
loaded at power-on reset or by one of the hard-coded reset options. For more information, see the Reset
Clock Configuration chapter in the MPC8308 PowerQUICC II Pro Processor Reference Manual.
The DDR SDRAM memory controller will operate with a frequency equal to twice the frequency of
csb_clk. Note that ddr_clk is not the external memory bus frequency; ddr_clk passes through the DDR
clock divider (÷2) to create the differential DDR memory bus clock outputs (MCK and MCK). However,
the data rate is the same frequency as ddr_clk.
The local bus memory controller will operate with a frequency equal to the frequency of csb_clk. Note that
lbc_clk is not the external local bus frequency; lbc_clk passes through the LBC clock divider to create the
external local bus clock outputs (LSYNC_OUT and LCLK0:2). The LBC clock divider ratio is controlled
by LCCR[CLKDIV]. For more information, see the Reset Clock Configuration chapter in the MPC8308
PowerQUICC II Pro Processor Reference Manual.
In addition, some of the internal units may be required to be shut off or operate at lower frequency than
the csb_clk frequency. These units have a default clock ratio that can be configured by a memory mapped
register after the device comes out of reset. Table 54 specifies which units have a configurable clock
frequency. For more information, see Reset Clock Configuration chapter in the MPC8308 PowerQUICC
II Pro Processor Reference Manual.
Table 54. Configurable Clock Units
Unit
eTSEC1,eTSEC2
Default Frequency
Options
csb_clk/3
Off, csb_clk, csb_clk/2, csb_clk/3
I2C
csb_clk
Off, csb_clk,csb_clk/2, csb_clk/3
DMA complex
csb_clk
Off, csb_clk,csb_clk/2,csb_clk/3
PCIEXP
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
eSDHC
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
USB
csb_clk
Off, csb_clk, csb_clk/2, csb_clk/3
NOTE
The clock ratios of these units must be set before they are accessed.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
76
Freescale Semiconductor
Clocking
Table 55 provides the operating frequencies for the device under recommended operating conditions
(Table 2).
Table 55. Operating Frequencies for MPC8308
Characteristic1
Maximum Operating Frequency
Unit
e300 core frequency (core_clk)
400
MHz
Coherent system bus frequency (csb_clk)
133
MHz
DDR2 memory bus frequency (MCK)2
133
MHz
Local bus frequency (LCLK0)3
66
MHz
Notes:
1. The SYS_CLK_IN frequency, RCWL[SPMF], and RCWL[COREPLL] settings must be chosen such that the resulting csb_clk,
MCK, LCLK0, and core_clk frequencies do not exceed their respective maximum or minimum operating frequencies.
2. The DDR data rate is 2x the DDR memory bus frequency.
3. The local bus frequency is 1/2, 1/4, or 1/8 of the lbc_clk frequency (depending on LCCR[CLKDIV]) which is in turn, 1x or 2x
the csb_clk frequency (depending on RCWL[LBCM]).
21.2
System PLL Configuration
The system PLL is controlled by the RCWL[SPMF] parameter. Table 56 shows the multiplication factor
encodings for the system PLL.
Table 56. System PLL Ratio
RCWL[SPMF]
csb_clk : SYS_CLK_IN
0000
Reserved
0001
Reserved
0010
2:1
0011
3:1
0100
4:1
0101
5:1
0110–1111
Reserved
1000
8:1
1001
9:1
1010
10 : 1
1011
11 : 1
1100
12 : 1
1101
13 : 1
1110
14 : 1
1111
15: 1
As described in Section 21, “Clocking,” the LBCM, DDRCM, and SPMF parameters in the reset
configuration word low select the ratio between the primary clock input (SYS_CLK_IN) and the internal
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77
Clocking
coherent system bus clock (csb_clk). Table 57 shows the expected frequency values for the CSB frequency
for select csb_clk to SYS_CLK_IN ratios.
Table 57. CSB Frequency Options
Input Clock Frequency (MHz)
SPMF
csb_clk :Input Clock Ratio
25
21.3
0010
2:1
0100
4:1
0101
5:1
33.33
66.67
133
133
125
Core PLL Configuration
RCWL[COREPLL] selects the ratio between the internal coherent system bus clock (csb_clk) and the e300
core clock (core_clk). Table 58 shows the encodings for RCWL[COREPLL]. COREPLL values that are
not listed in Table 58 should be considered as reserved.
NOTE
Core VCO frequency = core frequency × VCO divider. The VCO divider,
which is determined by RCWLR[COREPLL], must be set properly so that
the core VCO frequency is in the range of 400–800 MHz.
Table 58. e300 Core PLL Configuration
RCWL[COREPLL]
core_clk: csb_clk Ratio1
VCO Divider (VCOD)2
0–1
2–5
6
nn
0000
0
PLL bypassed
(PLL off, csb_clk clocks core directly)
PLL bypassed
(PLL off, csb_clk clocks core directly)
11
nnnn
n
n/a
n/a
00
0001
0
1:1
2
01
0001
0
1:1
4
10
0001
0
1:1
8
00
0001
1
1.5:1
2
01
0001
1
1.5:1
4
10
0001
1
1.5:1
8
00
0010
0
2:1
2
01
0010
0
2:1
4
10
0010
0
2:1
8
00
0010
1
2.5:1
2
01
0010
1
2.5:1
4
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Thermal
Table 58. e300 Core PLL Configuration (continued)
RCWL[COREPLL]
core_clk: csb_clk Ratio1
VCO Divider (VCOD)2
0–1
2–5
6
10
0010
1
2.5:1
8
00
0011
0
3:1
2
01
0011
0
3:1
4
10
0011
0
3:1
8
Note:
1
2
For any core_clk:csb_clk ratios, the core_clk must not exceed its maximum operating frequency of 333 MHz.
Core VCO frequency = core frequency × VCO divider. Note that VCO divider has to be set properly so that the
core VCO frequency is in the range of 400–800 MHz.
22 Thermal
This section describes the thermal specifications of the device.
22.1
Thermal Characteristics
Table 59 provides the package thermal characteristics for the 473, 19 × 19 mm MAPBGA.
Table 59. Package Thermal Characteristics for MAPBGA
Characteristic
Board Type
Symbol
Value
Unit
Notes
Junction to Ambient Natural Convection
Single layer board (1s)
RθJA
42
°C/W
1,2
Junction to Ambient Natural Convection
Four layer board (2s2p)
RθJA
27
°C/W
1,2,3
Junction to Ambient (@200 ft/min)
Single layer board (1s)
RθJMA
35
°C/W
1,3
Junction to Ambient (@200 ft/min)
Four layer board (2s2p)
RθJMA
24
°C/W
1,3
Junction to Board
—
RθJB
17
°C/W
4
Junction to Case
—
RθJC
9
°C/W
5
Natural Convection
ΨJT
2
°C/W
6
Junction to Package Top
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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79
Thermal
Table 59. Package Thermal Characteristics for MAPBGA (continued)
Characteristic
Board Type
Symbol
Value
Unit
Notes
Notes:
1. Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal
resistance.
2. Per JEDEC JESD51-2 with the single layer board horizontal. Board meets JESD51-9 specification.
3. Per JEDEC JESD51-6 with the board horizontal.
4. Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on
the top surface of the board near the package.
5. Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883 Method
1012.1).
6. Thermal characterization parameter indicating the temperature difference between package top and the junction
temperature per JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is written
as Psi-JT.
22.2
Thermal Management Information
For the following sections, PD = (VDD × IDD) + PI/O, where PI/O is the power dissipation of the I/O drivers.
22.2.1
Estimation of Junction Temperature with Junction-to-Ambient
Thermal Resistance
An estimation of the chip junction temperature, TJ, can be obtained from the equation:
TJ = TA + (RθJA × PD)
where:
TJ = junction temperature (°C)
TA = ambient temperature for the package (°C)
RθJA = junction-to-ambient thermal resistance (°C/W)
PD = power dissipation in the package (W)
The junction-t-ambient thermal resistance is an industry standard value that provides a quick and easy
estimation of thermal performance. As a general statement, the value obtained on a single layer board is
appropriate for a tightly packed printed-circuit board. The value obtained on the board with the internal
planes is usually appropriate if the board has low power dissipation and the components are well separated.
Test cases have demonstrated that errors of a factor of two (in the quantity TJ – TA) are possible.
22.2.2
Estimation of Junction Temperature with Junction-to-Board
Thermal Resistance
The thermal performance of a device cannot be adequately predicted from the junction-to-ambient thermal
resistance. The thermal performance of any component is strongly dependent on the power dissipation of
surrounding components. In addition, the ambient temperature varies widely within the application. For
many natural convection and especially closed box applications, the board temperature at the perimeter
(edge) of the package is approximately the same as the local air temperature near the device. Specifying
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System Design Information
the local ambient conditions explicitly as the board temperature provides a more precise description of the
local ambient conditions that determine the temperature of the device.
At a known board temperature, the junction temperature is estimated using the following equation:
TJ = TB + (RθJB × PD)
where:
TJ = junction temperature (°C)
TB = board temperature at the package perimeter (°C)
RθJB = junction-to-board thermal resistance (°C/W) per JESD51–8
PD = power dissipation in the package (W)
When the heat loss from the package case to the air can be ignored, acceptable predictions of junction
temperature can be made. The application board should be similar to the thermal test condition: the
component is soldered to a board with internal planes.
22.2.3
Experimental Determination of Junction Temperature
To determine the junction temperature of the device in the application after prototypes are available, the
thermal characterization parameter (ΨJT) can be used to determine the junction temperature with a
measurement of the temperature at the top center of the package case using the following equation:
TJ = TT + (ΨJT × PD)
where:
TJ = junction temperature (°C)
TT = thermocouple temperature on top of package (°C)
ΨJT = thermal characterization parameter (°C/W)
PD = power dissipation in the package (W)
The thermal characterization parameter is measured per JESD51-2 specification using a 40 gauge type T
thermocouple epoxied to the top center of the package case. The thermocouple should be positioned so
that the thermocouple junction rests on the package. A small amount of epoxy is placed over the
thermocouple junction and over about 1 mm of wire extending from the junction. The thermocouple wire
is placed flat against the package case to avoid measurement errors caused by cooling effects of the
thermocouple wire.
23 System Design Information
This section provides electrical and thermal design recommendations for successful application of the
device
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81
System Design Information
23.1
System Clocking
The device includes two PLLs.
1. The platform PLL generates the platform clock from the externally supplied SYS_CLK_IN input.
The frequency ratio between the platform and SYS_CLK_IN is selected using the platform PLL
ratio configuration bits as described in Section 21.2, “System PLL Configuration.”
2. The e300 core PLL generates the core clock as a slave to the platform clock. The frequency ratio
between the e300 core clock and the platform clock is selected using the e300 PLL ratio
configuration bits as described in Section 21.3, “Core PLL Configuration.”
23.2
PLL Power Supply Filtering
Each of the PLLs listed above is provided with power through independent power supply pins (AVDD1 for
core PLL and AVDD2 for the platform PLL). The AVDD level should always be equivalent to VDD, and
preferably these voltages are derived directly from VDD through a low pass filter scheme such as the
following.
There are a number of ways to reliably provide power to the PLLs, but the recommended solution is to
provide independent filter circuits as illustrated in Figure 54, one to each of the two AVDD pins. By
providing independent filters to each PLL the opportunity to cause noise injection from one PLL to the
other is reduced.
This circuit is intended to filter noise in the PLLs’ resonant frequency range from a 500 kHz to 10 MHz
range. It should be built with surface mount capacitors with minimum effective series inductance (ESL).
Consistent with the recommendations of Dr. Howard Johnson in High Speed Digital Design: A Handbook
of Black Magic (Prentice Hall, 1993), multiple small capacitors of equal value are recommended over a
single large value capacitor.
Each circuit should be placed as close as possible to the specific AVDD pin being supplied to minimize
noise coupled from nearby circuits. It should be possible to route directly from the capacitors to the AVDD
pin, which is on the periphery of package, without the inductance of vias.
Figure 54 shows the PLL power supply filter circuits.
10 Ω
VDD
AVDD1 and AVDD2
2.2 µF
2.2 µF
Low ESL Surface Mount Capacitors
Figure 54. PLL Power Supply Filter Circuit
23.3
Decoupling Recommendations
Due to large address and data buses, and high operating frequencies, the device can generate transient
power surges and high frequency noise in its power supply, especially while driving large capacitive loads.
This noise must be prevented from reaching other components in the MPC8308 system, and the MPC8308
itself requires a clean, tightly regulated source of power. Therefore, it is recommended that the system
designer place at least one decoupling capacitor at each VDD, NVDD, GVDD and LVDD pin of the device.
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System Design Information
These decoupling capacitors should receive their power from separate VDD, NVDD, GVDD, LVDD, and
VSS power planes in the PCB, utilizing short traces to minimize inductance. Capacitors may be placed
directly under the device using a standard escape pattern. Others may surround the part.
These capacitors should have a value of 0.01 or 0.1 µF. Only ceramic SMT (surface mount technology)
capacitors should be used to minimize lead inductance, preferably 0402 or 0603 sizes.
In addition, it is recommended that there be several bulk storage capacitors distributed around the PCB,
feeding the VDD, NVDD, GVDD, LVDD planes, to enable quick recharging of the smaller chip capacitors.
These bulk capacitors should have a low ESR (equivalent series resistance) rating to ensure the quick
response time necessary. They should also be connected to the power and ground planes through two vias
to minimize inductance. Suggested bulk capacitors—100 to 330 µF (AVX TPS tantalum or Sanyo
OSCON). However, customers should work directly with their power regulator vendor for best values and
types of bulk capacitors.
23.4
Connection Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signal
level. Unused active low inputs should be tied to NVDD, GVDD, LVDD as required. Unused active high
inputs should be connected to VSS. All NC (no-connect) signals must remain unconnected.
Power and ground connections must be made to all external VDD, NVDD, AVDD1, AVDD2, GVDD, LVDD
and VSS pins of the device.
23.5
Output Buffer DC Impedance
The device drivers are characterized over process, voltage, and temperature. For all buses, the driver is a
push-pull single-ended driver type (open drain for I2C, MDIO and HRESET)
To measure Z0 for the single-ended drivers, an external resistor is connected from the chip pad to NVDD
or VSS. Then, the value of each resistor is varied until the pad voltage is NVDD/2 (Figure 55). The output
impedance is the average of two components, the resistances of the pull-up and pull-down devices. When
data is held high, SW1 is closed (SW2 is open), and RP is trimmed until the voltage at the pad equals
NVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are designed to be close to each
other in value. Then, Z0 = (RP + RN)/2.
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83
System Design Information
NVDD
RN
SW2
Pad
Data
SW1
RP
VSS
Figure 55. Driver Impedance Measurement
The value of this resistance and the strength of the driver’s current source can be found by making two
measurements. First, the output voltage is measured while driving logic 1 without an external differential
termination resistor. The measured voltage is V1 = Rsource × Isource. Second, the output voltage is measured
while driving logic 1 with an external precision differential termination resistor of value Rterm. The
measured voltage is V2 = (1/(1/R1 + 1/R2)) × Isource. Solving for the output impedance gives Rsource =
Rterm × (V1/V2 – 1). The drive current is then Isource = V1/Rsource.
Table 60 summarizes the signal impedance targets. The driver impedance are targeted at minimum VDD,
nominal NVDD, 105°C.
Table 60. Impedance Characteristics
Impedance
Local Bus, Ethernet, DUART, Control,
Configuration, Power Management
DDR DRAM
Symbol
Unit
RN
42 Target
20 Target
Z0
Ω
RP
42 Target
20 Target
Z0
Ω
Note: Nominal supply voltages. See Table 2, Tj = 105°C.
23.6
Configuration Pin Muxing
The device provides the user with power-on configuration options which can be set through the use of
external pull-up or pull-down resistors of 4.7 KΩ on certain output pins (see customer visible
configuration pins). These pins are generally used as output only pins in normal operation.
While PORESET is asserted however, these pins are treated as inputs. The value presented on these pins
while PORESET is asserted, is latched when PORESET deasserts, at which time the input receiver is
disabled and the I/O circuit takes on its normal function. Careful board layout with stubless connections
to these pull-up/pull-down resistors coupled with the large value of the pull-up/pull-down resistor should
minimize the disruption of signal quality or speed for output pins thus configured.
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Ordering Information
23.7
Pull-Up Resistor Requirements
The device requires high resistance pull-up resistors (10 kΩ is recommended) on open drain type pins
including I2C, Ethernet management MDIO, HRESET and IPIC (integrated programmable interrupt
controller).
Correct operation of the JTAG interface requires configuration of a group of system control pins as
demonstrated in Figure 56. Care must be taken to ensure that these pins are maintained at a valid deasserted
state under normal operating conditions because most have asynchronous behavior and spurious assertion,
which give unpredictable results.
24 Ordering Information
This section presents ordering information for the devices discussed in this document, and it shows an
example of how the parts are marked. Ordering information for the devices fully covered by this document
is provided in Section 24.1, “Part Numbers Fully Addressed by This Document.”
24.1
Part Numbers Fully Addressed by This Document
Table 61 provides the Freescale part numbering nomenclature for the MPC8308 family. Note that the
individual part numbers correspond to a maximum processor core frequency. For available frequencies,
contact your local Freescale sales office. In addition to the maximum processor core frequency, the part
numbering scheme also includes the maximum effective DDR memory speed. Each part number also
contains a revision code which refers to the die mask revision number.
Table 61. Part Numbering Nomenclature
MPC
nnnn
C
VM
AD
D
A
Product
Code
Part
Identifier
Temperature
Range1
Package2
e300 Core
Frequency3
DDR
Frequency
Revision
Level
MPC
8308
Blank = 0 to
105°C
C = –40 to 105°C
VM = Pb-free 473
MAPBGA
AD = 266 MHz
AF = 333 MHz
AG = 400MHz
D = 266 MHz
Contact local
Freescale
sales office
Notes:
1. Contact local Freescale office on availability of parts with C temperature range.
2. See Section 20, “Package and Pin Listings,” for more information on available package types.
3. Processor core frequencies supported by parts addressed by this specification only. Not all parts described in this
specification support all core frequencies. Additionally, parts addressed by Part Number Specifications may support
other maximum core frequencies.
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 0
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Document Revision History
24.2
Part Marking
Parts are marked as in the example shown in Figure 56.
MPCnnnnCVMADDA
core/platform MHZ
ATWLYYWW
CCCCC
*MMMMM
YWWLAZ
PBGA
Notes:
ATWLYYWW is the traceability code.
CCCCC is the country code.
MMMMM is the mask number.
YWWLAZ is the assembly traceability code.
Figure 56. Freescale Part Marking for PBGA Devices
Table 62 shows the SVR settings:
Table 62. SVR Settings
Device
Package
SVR
MPC8308
MAPBGA
0x8101 _0110
Note: PVR = 8085_0020 for the device.
25 Document Revision History
Table 63 provides a revision history for this hardware a revision history for this hardware specification.
Table 63. Document Revision History
Revision
Date
Rev 0
05/2010
Substantive Change(s)
Initial release
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Document Revision History
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