DS125BR820 Datasheet, PDF (27/62 Pages) Texas Instruments – Low-Power 12.5 Gbps 8-Channel Linear Repeater

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DS125BR820
SNLS491B – JULY 2014 – REVISED FEBRUARY 2015
7.7.5 Detailed Register Map
Table 9. SMBus Slave Mode Register Map
Address
Register
Name
Bit
Field
Type Default
EEPROM
Reg Bit
Description
7
Reserved R/W
Set bit to 0
0x00
6:3
Address Bit
AD[3:0]
R
Observation
0x00
Observation of AD[3:0] bits
[6]: AD3
[5]: AD2
[4]: AD1
[3]: AD0
2
EEPROM
Read Done
R
1 = Device completed the read from external EEPROM
1
Reserved R/W
Set bit to 0
0
Reserved R/W
Set bit to 0
0x01
PWDN
Channels
7:0 PWDN CHx R/W 0x00
Power Down per Channel
[7]: CH7 – CHA_3
[6]: CH6 – CHA_2
[5]: CH5 – CHA_1
[4]: CH4 – CHA_0
[3]: CH3 – CHB_3
Yes [2]: CH2 – CHB_2
[1]: CH1 – CHB_1
[0]: CH0 – CHB_0
0x00 = all channels enabled
0xFF = all channels disabled
Note: Override PWDN pin and enable register control
via Reg 0x02[0]
7
Override
PRSNT
1 = Override Automatic Rx Detect State Machine Reset
0x02
6 PRSNT Value
Override
PWDN, PRSNT 5:2
Reserved ^R/W
0x00
1 = Set Rx Detect State Machine Reset
0 = Clear Rx Detect State Machine Reset
Yes Set bits to 0
1
Reserved
Set bit to 0
0
Override
PWDN
Yes
1 = Block PWDN pin control (Register control enabled)
0 = Allow PWDN pin control (Register control disabled)
0x03
Reserved
7:0 Reserved R/W 0x00
Set bits to 0
0x04
Reserved
7:0 Reserved R/W 0x00
Yes Set bits to 0
0x05
Reserved
7:0 Reserved R/W 0x00
Set bits to 0
7:5 Reserved
Set bits to 0
4
Reserved
Yes Set bit to 1
0x06
Slave Register
Control
3
Register
Enable
R/W 0x10
1 = Enable SMBus Slave Mode Register Control
Note: In order to change VOD, VOD_DB, and EQ of
the channels in slave mode, this bit must be set to
1.
2:0 Reserved
Set bits to 0
7
Reserved
Set bit to 0
0x07
Digital Reset
and Control
6
Reset
Registers
R/W 0x01
5
Reset SMBus
Master
1 = Self clearing reset for SMBus registers (register
settings return to default values)
1 = Self clearing reset to SMBus master state machine
4:0 Reserved
Set bits to 0 0001'b
7
Reserved
Set bit to 0
0x08
6
Override
SD_TH
Override
Pin Control
5:4
Reserved R/W 0x00
3
Override
RXDET
Yes
1 = Block SD_TH pin control (Register control enabled)
0 = Allow SD_TH pin control (Register control disabled)
Yes Set bits to 0
Yes
1 = Block RXDET pin control (Register control enabled)
0 = Allow RXDET pin control (Register control disabled)
2:0 Reserved
Yes Set bits to 0
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