NSC DS64BR401 Quad bi-directional transceiver with equalization and de-emphasis Datasheet

DS64BR401
Quad Bi-Directional Transceiver with Equalization and
De-Emphasis
General Description
Features
The DS64BR401 is a quad lane bi-directional signal conditioning transceiver suitable for 6.0/3.0/1.5 Gbps SATA/SAS
and other high-speed bus applications with data rates up to
6.4 Gbps. The device performs both receive equalization and
transmit de-emphasis on each of its 8 channels to compensate for channel loss, allowing maximum flexibility of physical
placement within a system. The receiver's continuous time
linear equalizer (CTLE) provides a boost of up to +33 dB at 3
GHz and is capable of opening an input eye that is completely
closed due to inter-symbol interference (ISI) induced by the
interconnect medium. The transmitter features a programmable output de-emphasis driver and allows amplitude
voltage levels to be selected from 600 mVp-p to 1200 mVp-p
to suit multiple application scenarios. This Low Power Differential Signaling (LPDS) output driver is a power efficient
implementation that maintains compatibility with AC coupled
CML receiver. The programmable settings can be applied via
pin settings or SMBus interface.
To enable seamless upgrade from SAS/SATA 3.0 Gbps to 6.0
Gbps data rates without compromising physical reach,
DS64BR401 automatically detects the incoming data rate and
selects the optimal de-emphasis pulse width. The device detects the out-of-band (OOB) idle and active signals of the
SAS/SATA specification and passes through with minimum
signal distortion.
With a typical power consumption of 200 mW/lane (100 mW/
channel) at 6.4 Gbps, and control to turn-off unused channels,
the DS64BR401 is part of National's PowerWise family of energy efficient devices.
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Quad lane bi-directional transceiver up to 6.4 Gbps rate
Signal conditioning on input and output for extended reach
Adjustable receive equalization up to +33 dB gain
Adjustable transmit de-emphasis up to −12 dB
Adjustable transmit VOD (600 mVp-p to 1200 mVp-p)
<0.25 UI of residual DJ at 6.4 Gbps with 40” FR4 trace
Automatic de-emphasis scaling based on rate detect
SATA/SAS: OOB signal pass-through,
<3 ns (typ) envelope distortion
Adjustable electrical IDLE detect threshold
Low power (100 mW/channel), per-channel power down
Programmable via pin selection or SMBus interface
Single supply operation at 2.5V ±5%
>6 kV HBM ESD Rating
3.3V LVCMOS input tolerant for SMBus interface
High speed signal flow–thru pinout package: 54-pin LLP
(10 mm x 5.5 mm)
Applications
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SATA (1.5, 3.0 and 6 Gbps)
SAS (1.5, 3.0 and 6 Gbps)
XAUI (3.125 Gbps), RXAUI (6.25 Gbps)
sRIO – Serial Rapid I/O
Fibre Channel (4.25 Gbps)
10GBase-CX4, InfiniBand 4x (SDR & DDR)
QSFP active copper cable modules
High-speed active cable and FR-4 backplane traces
Typical Cable Application
30073081
© 2009 National Semiconductor Corporation
300730
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DS64BR401 Quad Bi-directional Transceiver with Equalization and De-Emphasis
June 25, 2009
DS64BR401
Typical Application Connection Diagram
30073080
Block Diagram - Detail View of the
each channel (1 of 8)
30073086
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2
DS64BR401
Pin Diagram
30073092
DS64BR401 Pin Diagram 54L LLP
Ordering Information
NSID
Qty
Spec
Package
DS64BR401SQ
Tape & Reel Supplied As 2,000 Units
NOPB
SQA54A
DS64BR401SQE
Tape & Reel Supplied As 250 Units
NOPB
SQA54A
3
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DS64BR401
Pin Descriptions
Pin Name
Pin Number
I/O, Type
Pin Descriptions
Differential High Speed I/O's
IA_0+, IA_0- ,
IA_1+, IA_1-,
IA_2+, IA_2-,
IA_3+, IA_3-
10, 11
12, 13
15, 16
17, 18
I, CML
Inverting and non-inverting CML differential inputs to the
equalizer. A gated on-chip 50Ω termination resistor connects
INA_n+ to VDD and INA_n- to VDD when enabled.
OA_0+, OA_0-,
OA_1+, OA_1-,
OA_2+, OA_2-,
OA_3+, OA_3-
35, 34
33, 32
31, 30
29, 28
O, LPDS
Inverting and non-inverting low power differential signaling
(LPDS) 50Ω outputs with de-emphasis. Compatible with AC
coupled CML inputs.
IB_0+, IB_0- ,
IB_1+, IB_1-,
IB_2+, IB_2-,
IB_3+, IB_3-
45, 44
43, 42
40, 39
38, 37
I, CML
Inverting and non-inverting CML differential inputs to the
equalizer. A gated on-chip 50Ω termination resistor connects
INB_n+ to VDD and INB_n- to VDD when enabled.
OB_0+, OB_0-,
OB_1+, OB_1-,
OB_2+, OB_2-,
OB_3+, OB_3-
1, 2
3, 4
5, 6
7, 8
O, LPDS
Inverting and non-inverting low power differential signaling
(LPDS) 50Ω outputs with de-emphasis. Compatible with AC
coupled CML inputs.
Control Pins — Shared (LVCMOS)
ENSMB
48
I, LVCMOS w/ System Management Bus (SMBus) enable pin.
internal pull- When pulled high provide access internal digital registers that
down
are a means of auxiliary control for such functions as
equalization, de-emphasis, VOD, rate, and idle detection
threshold.
When pulled low, access to the SMBus registers are disabled
and SMBus function pins are used to control the Equalizer
and De-Emphasis.
Please refer to “SMBus configuration Registers” section and
Electrical Characteristics - Serial Management Bus Interface
for detail information.
ENSMB = 1 (SMBUS MODE)
SDA, SCL
49, 50
I, LVCMOS
ENSMB = 1
The SMBus SDA (data input/output bi-directional) and SCL
(clock input) pins are enabled.
AD[3:0]
46, 47, 53, 54 I, LVCMOS w/ ENSMB = 1
internal pull- SMBus Slave Address Inputs. In SMBus mode, these pins are
down
the user set SMBus slave address inputs. See section —
System Management Bus (SMBus) and Configuration
Registers for additional information.
ENSMB = 0 (NORMAL PIN MODE)
EQA0, EQA1
EQB0, EQB1
20, 19
46, 47
I, Float,
LVCMOS
EQA/B, 3–level controls the level of equalization of the A/B
sides. The EQA/B pins are active only when ENSMB is deasserted (Low). Each of the 4 A/B channels have the same
level unless controlled by the SMBus control registers. When
ENSMB goes high the SMBus registers provide independent
control of each lane. See Table 1
DEMA0, DEMA1
DEMB0, DEMB1
49, 50
53, 54
I, Float,
LVCMOS
DEMA/B, 3–level controls the level of de-emphasis of the A/
B sides. The DEMA/B pins are only active when ENSMB is
de-asserted (Low). Each of the 4 A/B channels have the same
level unless controlled by the SMBus control registers. When
ENSMB goes High the SMBus registers provide independent
control of each lane. See Table 2
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4
Pin Number
I/O, Type
Pin Descriptions
Control Pins — Both Modes (LVCMOS)
RATE
21
I, Float,
LVCMOS
RATE, 3–level controls the pulse width of de-emphasis of the
output.
RATE = 0 forces 3 Gbps,
RATE = 1 forces 6 Gbps,
RATE = Float enables auto rate detection and the pulse width
(pull-back) is set appropriately after each exit from IDLE. This
requires the transition from IDLE to ACTIVE state — OOB
signal. See Table 2
TXIDLEA,TXIDLEB
24, 25
I, Float,
LVCMOS
TXIDLEA/B, 3–level controls the driver output.
TXIDLEA/B = 0 disables the signal detect/squelch function for
all A/B outputs.
TXIDLEA/B = 1 forces the outputs to be muted (electrical idle).
TXIDLEA/B = Float enables the signal auto detect/squelch
function and the signal detect voltage threshold level can be
adjusted using the SD_TH pin. See Table 3
VOD0, VOD1
22, 23
I, LVCMOS w/ VOD[1:0] adjusts the output differential amplitude voltage
internal pull- level.
down
VOD[1:0] = 00 sets output VOD = 600 mV (Default)
VOD[1:0] = 01 sets output VOD = 800 mV
VOD[1:0] = 10 sets output VOD = 1000 mV
VOD[1:0] = 11 sets output VOD = 1200 mV
PWDN
52
I, LVCMOS
PWDN = 0 enables the device (normal operation).
PWDN = 1 disables the device (low power mode).
Pin must be driven to a logic low at all time or normal operation
is not guaranteed.
27
I, ANALOG
Threshold select pin for electrical idle detect threshold. Float
pin for typical default 130 mVp-p (differential), otherwise
connect resistor from SD_TH to GND to set threshold voltage.
See Table 4, Figure 5
VDD
9, 14, 36, 41,
51
Power
Power supply pins. 2.5 V +/-5%
GND
DAP
Power
DAP is the large metal contact at the bottom side, located at
the center of the 54 pin LLP package. It should be connected
to the GND plane with at least 4 via to lower the ground
impedance and improve the thermal performance of the
package.
NC
26
Analog
SD_TH
Power
No Connect — Leave pin open
1 = HIGH, 0 = LOW, FLOAT = 3rd input state.
Don't drive FLOAT pin; pin is internally biased to mid level with 50 kΩ pull-up/pull-down.
Internal pulled-down = Internal 30 kΩ pull-down resistor to GND is present on the input.
Input edge rate for LVCMOS/FLOAT inputs must be faster than 50 ns from 10–90%.
5
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DS64BR401
Pin Name
DS64BR401
ESD Rating
HBM, STD - JESD22-A114C
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
≥6 kV
≥250 V
≥1250 V
MM, STD - JESD22-A115-A
CDM, STD - JESD22-C101-C
Thermal Resistance
Supply Voltage (VDD)
-0.5V to +3.0V
LVCMOS Input/Output Voltage
-0.5V to +4.0V
CML Input Voltage
-0.5V to (VDD+0.5V)
LPDS Output Voltage
-0.5V to (VDD+0.5V)
Analog (SD_TH)
-0.5V to (VDD+0.5V)
Junction Temperature
+125°C
Storage Temperature
-40°C to +125°C
Lead Temperature Range
Soldering (4 sec.)
+260°C
Maximum Package Power Dissipation at 25°C
SQA54A Package
4.21 W
Derate SQA54A Package
52.6mW/°C above +25°C
θJC
11.5°C/W
θJA, No Airflow, 4 layer JEDEC
19.1°C/W
Recommended Operating
Conditions
Supply Voltage
VDD to GND
Ambient Temperature
SMBus (SDA, SCL)
CML Differential Input
Voltage
Supply Noise Tolerance
up to 50 MHz, (Note 4)
Min
Typ
Max
Units
2.375
-10
0
0
2.5
25
2.625
+85
3.6
2.0
V
°C
V
Vp-p
100
mVp-p
Electrical Characteristics
Over recommended operating supply and temperature ranges with default register settings unless other specified. (Note 3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
PWDN = 0,
EQx = 0, DEMx = 0 dB,
K28.5 pattern
VOD = 1.0 Vp-p
758
950
mW
PWDN = 1, ENSMB = 0
0.92
1.125
mW
2.0
3.6
V
POWER
PD
Power Dissipation
LVCMOS / LVTTL DC SPECIFICATIONS
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IIH
Input High Current
IIL
Input Low Current
0
0.8
V
VIN = 3.3V,
Inputs OPEN: SDA, SCL, PWDN
-15
+15
μA
VIN = 3.3V,
Inputs with PULL-DOWN
and FLOAT — mid level
-15
+120
uA
VIN = 0V,
Inputs OPEN: SDA, SCL, PWDN and with
PULL-DOWN
-15
+15
μA
VIN = 0V,
Inputs with FLOAT — mid level
-80
+15
uA
CML RECEIVER INPUTS (IN_n+, IN_n-)
RLRX-DIFF
Rx Differential Return Loss
(SDD11),
(Note 2)
150 MHz – 1.5 GHz
-20
150 MHz – 3.0 GHz
-13.5
150 MHz – 6.0 GHz
-8
RLRX-CM
Rx Common Mode Input
Return Loss (SCC11)
150 MHz – 3.0 GHz, (Note 2)
RRX-IB
Rx Impedance Balance
(SDC11)
150 MHz – 3.0 GHz, (Note 2)
IIN
Maximum current allowed at
IN+ or IN- input pin.
RIN
Input Resistance
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-10
dB
-27
dB
−30
Single ended to VDD, (Note 2)
6
dB
+30
50
mA
Ω
RITD
Parameter
Conditions
Input Differential Impedance DC tested, (Note 2)
between
IN+ and IN-
Min
Typ
Max
Units
85
100
115
Ω
5
Ω
35
Ω
RITIB
Input Differential Impedance DC tested, (Note 2)
Imbalance
RICM
Input Common Mode
Impedance
VRX-DIFF
Differential Rx peak to peak DC voltage,
voltage
SD_TH = 20 kΩ to GND
0.1
1.2
V
VRX-SD_TH
Electrical Idle detect
threshold (differential)
40
175
mVp-p
DC tested, (Note 2)
SD_TH = Float, (Note 6), Figure 5
20
25
LPDS OUTPUTS (OUT_n+, OUT_n-)
VOD
VOCM
TTX-RF
Output Voltage Swing
RL = 50 Ω ±1% to GND (AC coupled with 10
nF), 6.4 Gbps, (Note 5)
DEMx = 0 dB,
VOD[1:0] = 00
500
600
700
mVP-P
VOD[1:0] = 11
1100
1265
1450
mVP-P
Output Common-Mode
Voltage
Single-ended measurement DC-Coupled
with 50Ω termination,
(Note 2)
Transmitter Rise/ Fall Time
20% to 80% of differential output voltage,
measured within 1” from output pins, (Notes
2, 5), Figure 1
VDD –
1.4
67
TRF-DELTA
Tx rise/fall mismatch
20% to 80% of differential output voltage,
(Notes 2, 5)
RLTX-DIFF
Tx Differential Return Loss
(SDD22),
(Note 2)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p,
150 MHz – 1.5 GHz
-11
150 MHz – 3.0 GHz
-10
V
85
ps
0.1
UI
dB
150 MHz – 6.0 GHz
-5
Tx Common Mode Return
Loss
(SCC22)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p, (Note 2)
50 MHz – 3.0 GHz
-10
dB
Tx Impedance Balance
(SDC22)
Repeating 1100b (D24.3) pattern,
VOD = 1.0 Vp-p, (Note 2)
50 MHz – 3.0 GHz
-30
dB
ITX-SHORT
Tx Output Short Circuit
Current Limit
OA/B_n = GND
ROTD
Output Differential
Impedance between OUT+
and OUT-
DC tested, (Note 2)
ROTIB
Output Differential
Impedance Imbalance
DC tested, (Note 2)
ROCM
Output Common Mode
Impedance
DC tested, (Note 2)
VTX-CM-DELTA
Common Mode Voltage
(Note 7)
Delta between active burst
and electrical Idle of an OOB
signal
RLTX-CM
RTX-IB
TDI
85
Max time to transition to valid VIN = 800 mVp-p, repeating 1100b (D24.3)
electrical idle after leaving
pattern at 3 Gbps,
active burst in OOB signaling SD_TH = Float, Figure 3
7
20
100
25
6.5
90
mA
125
Ω
5
Ω
35
Ω
±40
mV
9.5
ns
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DS64BR401
Symbol
DS64BR401
Symbol
TID
TPD
Parameter
Conditions
Min
Typ
Max
Units
5.5
8
ns
150
200
250
ps
120
170
Max time to transition to valid VIN = 800 mVp-p, repeating 1100b (D24.3)
active burst after leaving idle pattern at 3 Gbps,
in OOB signaling
SD_TH = Float, Figure 3
Differential Propagation
Propagation delay measured at midpoint
Delay (Low to High and High crossing between input to output, Figure 2,
to Low Edge)
EQx[1:0] = 11, DEMx[1:0] = −6 dB
220
ps
TLSK
Lane to Lane Skew in a
Single Part
EQx[1:0] = OFF, DEMx[1:0] = 0 dB
VDD = 2.5 V, TA = 25°C
27
ps
TPPSK
Part to Part Propagation
Delay Skew
VDD = 2.5 V, TA = 25°C
35
ps
EQUALIZATION
DJ1
DJ2
DJ3
DJ4
RJ
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Residual Deterministic Jitter Tx Launch Amplitude = 0.8 to
at 6.4 Gbps
1.2 Vp–p, 40” 4–mil FR4 trace,
EQx[1:0] = 0F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.12
0.25
UIP-P
Residual Deterministic Jitter Tx Launch Amplitude = 0.8 to
at 6.4 Gbps
1.2 Vp–p, 12 meters (30 AWG),
EQx[1:0] = 1F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.05
0.15
UIP-P
Residual Deterministic Jitter Tx Launch Amplitude = 0.8 to
at 3.2 Gbps
1.2 Vp–p, 40” 4–mil FR4 trace,
EQx[1:0] = 0F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.05
0.12
UIP-P
Residual Deterministic Jitter Tx Launch Amplitude = 0.8 to
at 3.2 Gbps
1.2 Vp–p, 12 meters (30 AWG),
EQx[1:0] = 1F, DEMx[1:0] = 0 dB,
VOD = 1.0 Vp-p, K28.5,
SD_TH = float, (Note 2)
0.06
0.16
UIP-P
Random Jitter
Tx Launch Amplitude = 0.8 to 1.2 Vp–p,
Repeating 1100b (D24.3) pattern
8
0.5
psrms
Parameter
Conditions
Min
Typ
Max
Units
Residual Deterministic Jitter Tx Launch amplitude = 0.8 to
at 6.4 Gbps
1.2 Vp–p, 10” 4–mil FR4 trace,
EQx[1:0] = OFF, DEMx[1:0] = −6 dB,
VOD = 1.0 Vp-p, K28.5, RATE = 1(Note 2)
0.09
0.20
UIP-P
Residual Deterministic Jitter Tx Launch amplitude = 0.8 to
at 3.2 Gbps
1.2 Vp–p, 20” 4–mil FR4 trace,
EQx[1:0] = OFF, DEMx[1:0] = −6 dB,
VOD = 1.0 Vp-p, K28.5, RATE = 0(Note 2)
0.07
0.18
UIP-P
DE-EMPHASIS
DJ5
DJ6
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions. Absolute Maximum Numbers are guaranteed for a junction temperature range of -40°C to +125°C. Models
are validated to Maximum Operating Voltages only.
Note 2: Typical values represent most likely parametric norms at VDD = 2.5V, TA = 25°C., and at the Recommended Operation Conditions at the time of product
characterization and are not guaranteed.
Note 3: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 4: Allowed supply noise (mVP-P sine wave) under typical conditions.
Note 5: Measured with clock-like {11111 00000} pattern.
Note 6: Measured at package pins of receiver. The 130 mVp-p is a typical threshold level and does not include hysteresis, thus less than 40 mVp-p is IDLE,
greater than 175 mVp-p is ACTIVE. SD_TH pin connected with resistor to GND overrides this default setting.
Note 7: Common-mode voltage (VCM) is expressed mathematically as the average of the two signal voltages with respect to local ground.
VCM = (A + B) / 2, A = OUT+, B = OUT-.
9
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DS64BR401
Symbol
DS64BR401
Electrical Characteristics — Serial Management Bus Interface
Over recommended operating supply and temperature ranges unless other specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
0.4
V
SERIAL BUS INTERFACE DC SPECIFICATIONS
VOL
Data (SDA) Low Level Output
Voltage
IOL = 3mA
VIL
Data (SDA), Clock (SCL) Input
Low Voltage
VIH
Data (SDA), Clock (SCL) Input
High Voltage
IPULLUP
Current Through Pull-Up Resistor High Power Specification
or Current Source
VDD
Nominal Bus Voltage
ILEAK-Bus
Input Leakage Per Bus Segment
ILEAK-Pin
Input Leakage Per Device Pin
CI
Capacitance for SDA and SDC
RTERM
External Termination Resistance VDD3.3,
pull to VDD = 2.5V ± 5% OR 3.3V ± (Notes 8, 9, 10)
10%
VDD2.5,
(Notes 8, 9, 10)
0.8
2.1
3.6
4
V
mA
2.375
(Note 8)
V
-200
3.6
V
+200
µA
-15
(Notes 8, 9)
µA
10
pF
2000
Ω
1000
Ω
SERIAL BUS INTERFACE TIMING SPECIFICATIONS. See Figure 4
FSMB
Bus Operating Frequency
(Note 11)
10
100
TBUF
Bus Free Time Between Stop and
Start Condition
4.7
µs
THD:STA
Hold time after (Repeated) Start
At IPULLUP, Max
Condition. After this period, the first
clock is generated.
4.0
µs
TSU:STA
Repeated Start Condition Setup
Time
4.7
µs
TSU:STO
Stop Condition Setup Time
4.0
µs
THD:DAT
Data Hold Time
300
ns
TSU:DAT
Data Setup Time
TTIMEOUT
Detect Clock Low Timeout
TLOW
Clock Low Period
THIGH
Clock High Period
(Note 11)
TLOW:SEXT
Cumulative Clock Low Extend
Time (Slave Device)
(Note 11)
tF
Clock/Data Fall Time
tR
tPOR
250
(Note 11)
25
ns
35
4.7
4.0
kHz
ms
µs
50
µs
2
ms
(Note 11)
300
ns
Clock/Data Rise Time
(Note 11)
1000
ns
Time in which a device must be
operational after power-on reset
(Note 11)
500
ms
Note 8: Recommended value. Parameter not tested in production.
Note 9: Recommended maximum capacitance load per bus segment is 400pF.
Note 10: Maximum termination voltage should be identical to the device supply voltage.
Note 11: Compliant to SMBus 2.0 physical layer specification. See System Management Bus (SMBus) Specification Version 2.0, section 3.1.1 SMBus common
AC specifications for details.
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DS64BR401
Timing Diagrams
300730502
FIGURE 1. LPDS Output Transition Times
300730503
FIGURE 2. Propagation Delay Timing Diagram
300730504
FIGURE 3. Idle Timing Diagram
30073094
FIGURE 4. SMBus Timing Parameters
11
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DS64BR401
SMBUS Mode
When in SMBus mode the VOD amplitude level, equalization
and de-emphasis are all programmable on a individual lane
basis, instead of grouped by sides as in the pin mode case.
Upon assertion of ENSMB pins EQx and DEMx functions revert to register control immediately. The EQx and DEMx pins
are converted to AD0-AD3 SMBus address inputs. The other
external control pins remain active unless their respective
registers are written to, in which case they are ignored until
ENSMB is driven low. On power-up and when ENSMB is
driven low all registers are reset to their default state. If
PWDN = 1 is asserted while ENSMB = 1, the registers retain
their current state.
Functional Description
The DS64BR401 is a quad transceiver optimized for backplane trace or cable interconnect up to 6.4 Gbps. The
DS64BR401 operates in two modes: Pin Control Mode
(ENSMB = 0) and SMBus Mode (ENSMB = 1).
Pin Control Mode:
When in pin mode (ENSMB = 0) , the transceiver is configurable with external pins. Equalization and de-emphasis can
be selected via pin for each side independently. When deemphasis is asserted VOD is automatically increased per the
De-Emphasis table below for improved performance over
lossy media. Rate optimization is also pin controllable, with
pin selections for 3 Gbps, 6 Gbps, and auto detect. The receiver electrical idle detect threshold is also programmable
via an optional external resistor on the SD_TH pin.
TABLE 1. Equalization Input Select Pins for A and B ports (3–Level Input)
EQ0
EQ1
Equalization Level
Recommended Media Length
F
F
Off
Bypass
1
1
5.8 dB at 3 GHz
8 inch FR4 (4-mil trace) or 0.7 meters (30 AWG)
0
0
9 dB at 3 GHz
12 inch FR4 (4-mil trace) or 1 meters (30 AWG)
0
F
11.7 dB at 3 GHz
20 inch FR4 (4-mil trace) or 5 meters (30 AWG)
0
1
14.6 dB at 3 GHz
25 inch FR4 (4-mil trace) or 6 meters (30 AWG)
1
F
18.4 dB at 3 GHz
35 inch FR4 (4-mil trace) or 9 meters (30 AWG)
1
0
20 dB at 3 GHz
40 inch FR4 (4-mil trace) or 10 meters (30 AWG)
F
0
21.2 dB at 3 GHz
10 meters (30 AWG)
F
1
28.4 dB at 3 GHz
12 meters (30 AWG)
Note: F = Float (don't drive pin), 1 = High and 0 = Low.
TABLE 2. De-Emphasis Input Select Pins for A and B ports (3–Level Input)
RATE DEM1 DEM0
DeDE Pulse
Emphasi
Width VOD (typ)
s Level
(typ)
(typ)
Recommended Media Length
0/F
0
0
0 dB
0 ps
VOD: 600 to 1200 mVp-p
10 inch FR4 trace or 1 meter (28 AWG)
0/F
0
1
-3.5 dB
330 ps
VOD = 1000 mVp-p
20 inch FR4 trace or 2 meters (28 AWG)
-2 dB
330 ps
VOD = 1200 mVp-p
15 inch FR4 trace or 2 meters (28 AWG)
-6 dB
330 ps
VOD = 1000 mVp-p
25 inch FR4 trace or 3 meters (28 AWG)
-3 dB
330 ps
VOD = 1200 mVp-p
20 inch FR4 trace or 2 meters (28 AWG)
0/F
0/F
0/F
0/F
0/F
1
1
0
1
F
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0
1
F
F
0
-9 dB
300 ps VOD = 1000 mVp-p
enhanced
5 meters (28 AWG)
-11 dB
300 ps VOD = 1200 mVp-p
enhanced
7 meters (28 AWG)
-6 dB
300 ps VOD = 1000 mVp-p
enhanced
5 meters (26 AWG)
-8 dB
300 ps VOD = 1200 mVp-p
enhanced
7 meters (26 AWG)
-12 dB
300 ps VOD = 1000 mVp-p
enhanced
8 meters (24 AWG)
-13 dB
300 ps VOD = 1200 mVp-p
enhanced
9 meters (24 AWG)
-9 dB
250 ps VOD = 1000 + 200 mVp-p
enhanced
8 meters (26 AWG)
-10 dB
250 ps VOD = 1200 + 200 mVp-p
enhanced
9 meters (26 AWG)
12
DeDE Pulse
Emphasi
Width VOD (typ)
s Level
(typ)
(typ)
Recommended Media Length
0/F
F
1
0/F
F
F
1/F
0
0
0 dB
0 ps
VOD: 600 to 1200 mVp-p
5 inch FR4 trace or 0.5 meter (28 AWG)
1/F
0
1
-3.5 dB
200 ps
VOD = 1000 mVp-p
10 inch FR4 trace or 1 meter (28 AWG)
-2 dB
200 ps
VOD = 1200 mVp-p
10 inch FR4 trace or 1 meters (28 AWG)
-6 dB
200 ps
VOD = 1000 mVp-p
20 inch FR4 trace or 2 meters (28 AWG)
-3 dB
200 ps
VOD = 1200 mVp-p
15 inch FR4 trace or 1 meters (28 AWG)
1/F
1/F
1/F
1/F
1/F
1
1
0
1
F
0
1
F
F
0
1/F
F
1
1/F
F
F
-12 dB
DS64BR401
RATE DEM1 DEM0
250 ps VOD: (1000 to 1200) + 200 mVp-p 10 meters (24 AWG)
enhanced
Reserved, don't use
-9 dB
180 ps VOD = 1000 mVp-p
enhanced
3 meters (28 AWG)
-11 dB
180 ps VOD = 1200 mVp-p
enhanced
4 meters (28 AWG)
-6 dB
180 ps VOD = 1000 mVp-p
enhanced
3 meters (26 AWG)
-8 dB
180 ps VOD = 1200 mVp-p
enhanced
4 meters (26 AWG)
-12 dB
180 ps VOD = 1000 mVp-p
enhanced
5 meters (24 AWG)
-13 dB
180 ps VOD = 1200 mVp-p
enhanced
6 meters (24 AWG)
-9 dB
160 ps VOD = 1000 + 200 mVp-p
enhanced
5 meters (26 AWG)
-10 dB
160 ps VOD = 1200 + 200 mVp-p
enhanced
6 meters (26 AWG)
-12 dB
160 ps VOD: (1000 to 1200) + 200 mVp-p 7 meters (24 AWG)
enhanced
Reserved, don't use
Note: F = Float (don't drive pin), 1 = High and 0 = Low. Enhanced DE pulse width provides de-empahsis on second bit.
When RATE = F (auto rate detection active), the DE level and pulse width settings follow detected rate after exiting IDLE. RATE
= 0 is 3 Gbps and RATE = 1 is 6 Gbps. De-emphasis should only be used with VOD = 1000 mVp-p or 1200 mVp-p. VOD less
then 1000 mVp-p is not recommended with de-emphasis. Please refer to VOD1 and VOD0 pin description to set the output
differential voltage level.
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DS64BR401
TABLE 3. Idle Control (3–Level Input)
TXIDLEA/B
Function
0
This state is for lossy media, dedicated Idle threshold detect circuit disabled, output follows input based
on EQ settings. Idle state not guaranteed.
Float
Float enables automatic idle detection. Idle on the input is passed to the output. Internal 50KΩ resistors
hold TXIDLEA/B pin at a mid level - don't connect this pin if the automatic idle detect function is desired.
This is the default state. Output in Idle if differential input signal less than value set by SD_TH pin.
1
Manual override, output in electrical Idle. Differential inputs are ignored.
TABLE 4. Receiver Electrical Idle Detect Threshold Adjust
SD_TH resistor value (Ω)
Receiver Electrical Idle Detect Threshold (DIFF p-p)
Float (no resistor required)
130 mV (default condition)
0
225 mV
80k
20 mV
SD_TH resistor value can be set from 0 through 80k ohms to achieve desired idle detect threshold, see Figure 5
Typical Performance Curves
30073093
FIGURE 5. Typical Idle Threshold vs. SD_TH resistor value
30073095
FIGURE 6. Typical Power Dissipation (PD) vs. Output Differential Voltage (VOD)
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14
The Device (Slave) drives the ACK bit (“0”).
The Host drives the 8-bit Register Address.
The Device drives an ACK bit (“0”).
The Host drives a START condition.
The Host drives the 7-bit SMBus Address, and a “1”
indicating a READ.
7. The Device drives an ACK bit “0”.
8. The Device drives the 8-bit data value (register contents).
9. The Host drives a NACK bit “1”indicating end of the
READ transfer.
10. The Host drives a STOP condition.
The READ transaction is completed, the bus goes IDLE and
communication with other SMBus devices may now occur.
The System Management Bus interface is compatible to SMBus 2.0 physical layer specification. ENSMB must be pulled
high to enable SMBus mode and allow access to the configuration registers.
The DS64BR401 has the AD[3:0] inputs in SMBus mode.
These pins are the user set SMBus slave address inputs. The
AD[3:0] pins have internal pull-down. When left floating or
pulled low the AD[3:0] = 0000'b, the device default address
byte is A0'h. Based on the SMBus 2.0 specification, the
DS64BR401 has a 7-bit slave address of 1010000'b. The LSB
is set to 0'b (for a WRITE), thus the 8-bit value is 1010 0000'b
or A0'h. The device address byte can be set with the use of
the AD[3:0] inputs. Below are some examples.
AD[3:0] = 0001'b, the device address byte is A2'h
AD[3:0] = 0010'b, the device address byte is A4'h
AD[3:0] = 0100'b, the device address byte is A8'h
AD[3:0] = 1000'b, the device address byte is B0'h
The SDC and SDA pins are 3.3V LVCMOS signaling and include high-Z internal pull up resistors. External low
impedance pull up resistors maybe required depending upon
SMBus loading and speed. Note, these pins are not 5V tolerant.
RECOMMENDED SMBUS REGISTER SETTINGS
When SMBus mode is enabled (ENSMB = 1), the default register settings are not configured to an appropriate level. Below
is the recommended settings to configure the EQ, VOD and
DE to a medium level that supports interconnect length of 20
inches FR4 trace or 3 to 5 meters of cable length. Please refer
to Table 1, Table 2, Table 5 for additional information and
recommended settings.
1. Reset the SMBus registers to default values:
Write 01'h to address 0x00.
2. Set equalization to external pin level EQ[1:0] = 00 (~9 dB
at 3 GHz) for all channels (CH0–CH7):
Write 30'h to address 0x0F, 0x16, 0x1D, 0x24, 0x2C,
0x33, 0x3A, 0x41.
3. Set VOD = 1.0V for all channels (CH0–CH7):
Write 0F'h to address 0x10, 0x17, 0x1E, 0x25, 0x2D,
0x34, 0x3B, 0x42.
4. Set de-emphasis to -6 dB enhance for all channels
(CH0–CH7):
Write 88'h to address 0x11, 0x18, 0x1F, 0x26, 0x2E,
0x35, 0x3C, 0x43.
5. Block the device from resetting to default values:
Write 02'h to address 0x00.
TRANSFER OF DATA VIA THE SMBUS
During normal operation the data on SDA must be stable during the time when SDC is High.
There are three unique states for the SMBus:
START: A High-to-Low transition on SDA while SDC is High
indicates a message START condition.
STOP: A Low-to-High transition on SDA while SDC is High
indicates a message STOP condition.
IDLE: If SDC and SDA are both High for a time exceeding
tBUF from the last detected STOP condition or if they are High
for a total exceeding the maximum specification for tHIGH then
the bus will transfer to the IDLE state.
IDLE AND RATE DETECTION TO EXTERNAL PINS
The functions of IDLE and RATE detection to external pins for
monitoring can be supported in SMBus mode. The external
GPIO pins of 19, 20, 46 and 47 will be changed and they will
serve as outputs for IDLE and RATE detect signals.
The following external pins should be set to auto detection:
RATE = F (FLOAT) – auto RATE detect enabled
TXIDLEA/B = F (FLOAT) – auto IDLE detect enabled
There are 4 GPIO pins that can be configured as outputs with
reg_4E[0].
To disable the external SMBus address pins, so pin 46 and
47 can be used as outputs:
SMBUS TRANSACTIONS
The device supports WRITE and READ transactions. See
Register Description table for register address, type (Read/
Write, Read Only), default value and function information.
WRITING A REGISTER
To write a register, the following protocol is used (see SMBus
2.0 specification).
1. The Host drives a START condition, the 7-bit SMBus
address, and a “0” indicating a WRITE.
2. The Device (Slave) drives the ACK bit (“0”).
3. The Host drives the 8-bit Register Address.
4. The Device drives an ACK bit (“0”).
5. The Host drive the 8-bit data byte.
6. The Device drives an ACK bit (“0”).
7. The Host drives a STOP condition.
The WRITE transaction is completed, the bus goes IDLE and
communication with other SMBus devices may now occur.
Write 01'h to address 0x4E.
Care must be taken to ensure that only the desired status
block is enabled and attached to the external pin as the status
blocks can be OR’ed together internally. Register bits reg_47
[5:4] and bits reg_4C[7:6] are used to enable each of the status block outputs to the external pins. The channel status
blocks can be internally OR’ed together to monitor more than
one channel at a time. This allows more information to be
presented on the status outputs and later if desired, a diagnosis of the channel identity can be made with additional
SMBus writes to register bits reg_47[5:4] and bits reg_4C
[7:6].
READING A REGISTER
To read a register, the following protocol is used (see SMBus
2.0 specification).
1. The Host drives a START condition, the 7-bit SMBus
address, and a “0” indicating a WRITE.
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DS64BR401
2.
3.
4.
5.
6.
System Management Bus (SMBus)
and Configuration Registers
DS64BR401
Below are examples to configure the device and bring the internal IDLE and RATE status to pins 19, 20, 46, 47.
Pin = LOW (GND) means ACTIVE (data signal present).
To monitor the RATE detect with two channels ORed (CH0
with CH2, CH1 with CH3, CH4 with CH6, CH5 with CH7):
To monitor the IDLE detect with two channels ORed (CH0
with CH2, CH1 with CH3, CH4 with CH6, CH5 with CH7):
Write C0'h to address 0x4C.
The following RATE status should be observable on the external pins:
pin 19 – CH0 with CH2,
pin 20 – CH1 with CH3,
pin 46 – CH4 with CH6,
pin 47 – CH5 with CH7.
Pin = HIGH (VDD) means high data rate is detected (6 Gbps).
Pin = LOW (GND) means low rate is detected (3 Gbps).
Write 32'h to address 0x47.
The following IDLE status should be observable on the external pins:
pin 19 – CH0 with CH2,
pin 20 – CH1 with CH3,
pin 46 – CH4 with CH6,
pin 47 – CH5 with CH7.
Pin = HIGH (VDD) means IDLE is detected (no signal
present).
TABLE 5. SMBus Register Map
Address Register Name
Bit (s) Field
Type Default
Description
0x00
7:2
Reserve
R/W
Set bits to 0.
1
Block SMBus Reset
SMBus Reset Block
0: Allow SMBus reset from bit 0
1: Block SMBus reset from bit 0
0
Reset
SMBus Reset
1: Reset registers to default value
Reset
0x00
0x01
PWDN Channels
7:0
PWDN CHx
R/W
0x00
Power Down per Channel
[7]: CHA_3
[6]: CHA_2
[5]: CHA_1
[4]: CHA_0
[3]: CHB_3
[2]: CHB_2
[1]: CHB_1
[0]: CHB_0
00'h = all channels enabled
FF'h = all channels disabled
0x02
PWDN Control
7:1
Reserve
R/W
0x00
Set bits to 0.
0
Override PWDN
0x08
Pin Control Override 7:5
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Reserve
0: Allow PWDN pin control
1: Block PWDN pin control
R/W
0x00
Set bits to 0.
4
Override IDLE
0: Allow IDLE pin control
1: Block IDLE pin control
3
Reserve
Set bit to 0.
2
Override RATE
0: Allow RATE pin control
1: Block RATE pin control
1:0
Reserve
Set bits to 0.
16
DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x0E
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH0 - CHB0
EQ Control
7:6
Reserve
5:0
CH0 IB0 EQ
CH0 - CHB0
VOD Control
7
Reserve
6:0
CH0 OB0 VOD
0x11
CH0 - CHB0
DE Control
7:0
CH0 OB0 DEM
R/W
0x03
OB0 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x12
CH0 - CHB0
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x0F
0x10
CH0 - CHB0
IDLE RATE Select
R/W
0x00
0x20
Set bits to 0.
IB0 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OB0 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x15
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH1 - CHB1
EQ Control
7:6
Reserve
5:0
CH1 IB1 EQ
CH1 - CHB1
VOD Control
7
Reserve
6:0
CH1 OB1 VOD
0x18
CH1 - CHB1
DE Control
7:0
CH1 OB1 DEM
R/W
0x03
OB1 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x19
CH1 - CHB1
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x16
0x17
CH1 - CHB1
IDLE RATE Select
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R/W
0x00
0x20
Set bits to 0.
IB1 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OB1 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
18
DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x1C
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH2 - CHB2
EQ Control
7:6
Reserve
5:0
CH2 IB2 EQ
CH2 - CHB2
VOD Control
7
Reserve
6:0
CH2 OB2 VOD
0x1F
CH2 - CHB2
DE Control
7:0
CH2 OB2 DEM
R/W
0x03
OB2 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x20
CH2 - CHB2
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x1D
0x1E
CH2 - CHB2
IDLE RATE Select
R/W
0x00
0x20
Set bits to 0.
IB2 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OB2 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
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DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x23
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH3 - CHB3
EQ Control
7:6
Reserve
5:0
CH3 IB3 EQ
CH3 - CHB3
VOD Control
7
Reserve
6:0
CH3 OB3 VOD
0x26
CH3 - CHB3
DE Control
7:0
CH3 OB3 DEM
R/W
0x03
OB3 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x27
CH3 - CHB3
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x24
0x25
CH3 - CHB3
IDLE RATE Select
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R/W
0x00
0x20
Set bits to 0.
IB3 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OB3 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
20
DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x2B
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH4 - CHA0
EQ Control
7:6
Reserve
5:0
CH4 IA0 EQ
CH4 - CHA0
VOD Control
7
Reserve
6:0
CH4 OA0 VOD
0x2E
CH4 - CHA0
DE Control
7:0
CH4 OA0 DEM
R/W
0x03
OA0 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x2F
CH4 - CHA0
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x2C
0x2D
CH4 - CHA0
IDLE RATE Select
R/W
0x00
0x20
Set bits to 0.
IA0 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OA0 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
21
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DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x32
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH5 - CHA1
EQ Control
7:6
Reserve
5:0
CH5 IA1 EQ
CH5 - CHA1
VOD Control
7
Reserve
6:0
CH5 OA1 VOD
0x35
CH5 - CHA1
DE Control
7:0
CH5 OA1 DEM
R/W
0x03
OA1 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x36
CH5 - CHA1
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x33
0x34
CH5 - CHA1
IDLE RATE Select
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R/W
0x00
0x20
Set bits to 0.
IA1 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OA1 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
22
DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x39
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH6 - CHA2
EQ Control
7:6
Reserve
5:0
CH6 IA2 EQ
CH6 - CHA2
VOD Control
7
Reserve
6:0
CH6 OA2 VOD
0x3C
CH6 - CHA2
DE Control
7:0
CH6 OA2 DEM
R/W
0x03
OA2 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x3D
CH6 - CHA2
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x3A
0x3B
CH6 - CHA2
IDLE RATE Select
R/W
0x00
0x20
Set bits to 0.
IA2 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OA2 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
23
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DS64BR401
Address Register Name
Bit (s) Field
Type Default
Description
0x40
7:6
Reserve
R/W
Set bits to 0.
5
IDLE auto
0: Allow IDLE_sel control in Bit 4
1: Automatic IDLE detect
4
IDLE select
0: Output is muted (electrical idle)
1: Output is ON (SD is disabled)
3:2
Reserve
Set bits to 0.
1
RATE auto
0: Allow RATE_sel control in Bit 0
1: Automatic RATE detect
0
RATE select
0: 2.5 to 3.2 Gbps
1: 5.0 to 6.4 Gbps
CH7 - CHA3
EQ Control
7:6
Reserve
5:0
CH7 IA3 EQ
CH7 - CHA3
VOD Control
7
Reserve
6:0
CH7 OA3 VOD
0x43
CH7 - CHA3
DE Control
7:0
CH7 OA3 DEM
R/W
0x03
OA3 DEM Control
[7]: DEM TYPE (Compatibility = 0 / Enhanced
= 1)
[6:0]: DEM Level Control
Pin [DEM1 DEM0] = Register [TYPE] [Level
Control] = Hex Value
00 = 00000001 = 01'h = 0.0 dB
01 = 00000011 = 03'h = −3.5 dB (Default)
10 = 00000101 = 05'h = −6.0 dB
0F = 10001000 = 88'h = −6.0 dB
01 = 10010000 = 90'h = −9.0 dB
1F = 10100000 = A0'h = −12.0 dB
F0 = 10010000 = 90'h = −9.0 dB
F1 = 10100000 = A0'h = −12.0 dB
FF = 11000000 = C0'h = Reserve
0x44
CH7 - CHA3
IDLE Threshold
7:4
Reserve
R/W
0x00
Set bits to 0.
3:0
IDLE threshold
0x41
0x42
CH7 - CHA3
IDLE RATE Select
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R/W
0x00
0x20
Set bits to 0.
IA3 EQ Control - total of 24 levels
(3 gain stages with 8 settings)
[5]: Enable EQ
[4:3]: Gain Stage Control
[2:0]: Boost Level Control
Pin [EQ0 EQ1] = Register [EN] [GST] [BST] =
Hex Value
FF = 100000 = 20'h = Bypass (Default)
11 = 101010 = 2A'h = 5 dB at 3 GHz
00 = 110000 = 30'h = 9 dB at 3 GHz
0F = 110010 = 32'h = 11.7 dB at 3 GHz
01 = 111001 = 39'h = 14.6 dB at 3 GHz
1F = 110101 = 35'h = 18.4 dB at 3 GHz
10 = 110111 = 37'h = 20 dB at 3 GHz
F0 = 111011 = 3B'h = 21.2 dB at 3 GHz
F1 = 111101 = 3D'h = 28.4 dB at 3 GHz
R/W
0x03
Set bit to 0.
OA3 VOD Control
03'h = 600 mV (Default)
07'h = 800 mV
0F'h = 1000 mV
1F'h = 1200 mV
3F'h = 1400 mV
De-assert = [3:2], assert = [1:0]
00 = 110 mV, 70 mV (Default)
01 = 150 mV, 110 mV
10 = 170 mV, 130 mV
11 = 190 mV, 150 mV
24
Bit (s) Field
Type Default
Description
0x47
7:6
Reserve
R/W
Set bits to 0.
5
CH2, CH3 CH6, CH7
0: Disabled IDLE Test Point for CH2, 3, 6, 7.
1: Enable IDLE Test Point for CH2, 3, 6, 7.
4
CH0, CH1 CH4, CH5
0: Disabled IDLE Test Point for CH0, 1, 4, 5.
1: Enable IDLE Test Point for CH0, 1, 4, 5.
3:0
Reserve
Set bits to 0010'b or h'2.
7
CH2, CH3 CH6, CH7 R/W
6
CH0, CH1 CH4, CH5
5:0
Reserve
7:1
Reserve
0
Block AD[3:0] pins
0x4C
0x4E
EN
Digital Test Point
IDLE Detect
EN
Digital Test Point
RATE Detect
Digital Test
0x02
0x00
0: Disabled RATE Test Point for CH2, 3, 6, 7.
1: Enable RATE Test Point for CH2, 3, 6, 7.
0: Disabled RATE Test Point for CH0, 1, 4, 5.
1: Enable RATE Test Point for CH0, 1, 4, 5.
Set bits to 0.
R/W
0x00
Set bits to 0.
1: Configure GPIO pin 46, 47, 53, 54 to be
outputs.
25
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DS64BR401
Address Register Name
DS64BR401
via placed close to the signal via for a low inductance return
current path is recommended. When the via structure is associated with stripline trace and a thick board, further optimization such as back drilling is often used to reduce the high
frequency effects of via stubs on the signal path. To minimize
cross-talk coupling, it is recommended to have >3X gap spacing between the differential pairs. For example, if the trace
width is 5 mils with 5 mils spacing – 100Ω differential
impedance (closely coupled). The gap spacing between the
differential pairs should be >15 mils.
Applications Information
GENERAL RECOMMENDATIONS
The DS64BR401 is a high performance circuit capable of delivering excellent performance. Careful attention must be paid
to the details associated with high-speed design as well as
providing a clean power supply. Refer to the LVDS Owner's
Manual for more detailed information on high speed design
tips to address signal integrity design issues.
PCB LAYOUT CONSIDERATIONS FOR DIFFERENTIAL
PAIRS
The CML inputs and LPDS outputs must have a controlled
differential impedance of 100Ω. It is preferable to route differential lines exclusively on one layer of the board, particularly for the input traces. The use of vias should be avoided if
possible. If vias must be used, they should be used sparingly
and must be placed symmetrically for each side of a given
differential pair. Route the differential signals away from other
signals and noise sources on the printed circuit board. See
AN-1187 for additional information on LLP packages.
The graphic shown below depicts a typical microstrip trace
routing design of the top and bottom layers. This should be
used as a reference to achieve the optimal system performance. Impedance discontinuities at the differential via can
be minimized or eliminated by increasing the swell around
each via hole. To further improve the signal quality, a ground
POWER SUPPLY BYPASSING
Two approaches are recommended to ensure that the
DS64BR401 is provided with an adequate power supply.
First, the supply (VDD) and ground (GND) pins should be
connected to power planes routed on adjacent layers of the
printed circuit board. The layer thickness of the dielectric
should be minimized so that the VDD and GND planes create
a low inductance supply with distributed capacitance. Second, careful attention to supply bypassing through the proper
use of bypass capacitors is required. A 0.01 μF bypass capacitor should be connected to each VDD pin such that the
capacitor is placed as close as possible to the DS64BR401.
Smaller body size capacitors can help facilitate proper component placement. Additionally, three capacitors with capacitance in the range of 2.2 μF to 10 μF should be incorporated
in the power supply bypassing design as well. These capacitors can be either tantalum or an ultra-low ESR ceramic.
300730101
FIGURE 7. Typical PCB Trace Routing
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26
DS64BR401
Typical Performance Eye-Diagram Characteristics
30073096
FIGURE 8. Test Setup Connection Diagram
30073097
30073098
TP0: Input — After 5m 26–AWG Cable at 6 Gbps
TP1: Output — After 1m 28–AWG Cable at 6 Gbps
(EQ[1:0] = F0, DEM[1:0] = 01)
FIGURE 9.
30073099
300730100
TP0: Input — After 1m 28–AWG cable at 6 Gbps
TP1: Output — After 5m 26–AWG Cable at 6 Gbps
(EQ[1:0] = 11, DEM[1:0] = F0)
FIGURE 10.
27
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DS64BR401
Physical Dimensions inches (millimeters) unless otherwise noted
54-pin LLP Package (5.5 mm x 10 mm x 0.8 mm, 0.5 mm pitch)
Order Number: DS64BR401SQ — Tape & Reel Supplied As 2,000 Units,
DS64BR401SQE — Tape & Reel Supplied As 250 Units
Package Number: SQA54A
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28
DS64BR401
Notes
29
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DS64BR401 Quad Bi-directional Transceiver with Equalization and De-Emphasis
Notes
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