DS80PCI402 Datasheet, PDF (21/39 Pages) Texas Instruments – 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 4 Lane PCI Express Repeater with Equalization and De-Emphasis

Table 9: SMBUS Slave Mode Register Map
Address Register Name
0x00
Observation,
Reset
Bit (s) Field
7
Reserved
6:3 Address Bit
AD[3:0]
0x01
2
EEPROM Read
Done
1
Block Reset
0
Reset
PWDN Channels 7:0 PWDN CHx
0x02
Override PRSNT, 7:6 Reserved
LPBK Control
5:4 LPBK
Control
0x05
0x06
3:1
0
Slave Mode CRC bits 7:0
Slave CRC Control 7:5
4
3
Reserved
Override PRSNT
pin
CRC bits
Reserved
Reserved
Slave CRC
2:0 Reserved
Type Default
R/W 0x00
R
R
R/W
R/W
R/W 0x00
R/W 0x00
R/W 0x00
R/W 0x10
Description
Set bit to 0.
Observation of AD[3:0] bits
[6]: AD3
[5]: AD2
[4]: AD1
[3]: AD0
1: Device completed the read from external
EEPROM.
1: Block bit 0 from resettting the registers; self
clearing.
SMBus Reset
1: Reset registers to default value; self clearing.
Power Down per Channel
[7]: CH7 – CHA_3
[6]: CH6 – CHA_2
[5]: CH5 – CHA_1
[4]: CH4 – CHA_0
[3]: CH3 – CHB_3
[2]: CH2 – CHB_2
[1]: CH1 – CHB_1
[0]: CH0 – CHB_0
00'h = all channels enabled
FF'h = all channels disabled
Note: override PRSNT pin.
Set bits to 0.
00: Use LPBK pin control
01: INA_n to OUTB_n loopback
10: INB_n to OUTA_n loopback
11: Disable loopback and ignore LPBK pin.
Set bits to 0.
1: Block PRSNT pin control
0: Allow PRSNT pin control
CRC bits [7:0]
Set bits to 0.
Set bit to 1.
1: Disables the slave CRC mode
0: Enables the slave CRC mode
Note: In order to change VOD, DEM and EQ of
the channels in slave mode, set bit to 1 to disable
the CRC.
Set bits to 0.
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