DS125BR401SQ Datasheet, PDF (23/52 Pages) Texas Instruments – Low-Power 12.5-Gbps 4-Lane Repeater With Input Equalization and Output De-Emphasis

DS125BR401
www.ti.com
SNLS419C – JULY 2012 – REVISED APRIL 2013
Table 10. SMBUS Slave Mode Register Map (continued)
Address
Register Name
0x02
Override PWDN,
LPBK Control
Bit
7:6
5:4
Field
Reserved
LPBK
Control
0x05
0x06
3:1
0
Slave Mode CRC bits 7:0
Slave Register
7:5
Control
4
3
Reserved
Override PWDN
pin
CRC bits
Reserved
Reserved
Register Enable
0x07
0x08
0x0E
Digital Reset and
Control
Override
Pin Control
CH0 - CHB0
IDLE, RXDET
2:0 Reserved
7
Reserved
6
Reset Registers
5
Reset SMBus
Master
4:0 Reserved
7
Reserved
6
Override SD_TH
5
Reserved
4
Override IDLE
3
Override RXDET
2
Override MODE
1
Reserved
0
Reserved
7:6 Reserved
5
IDLE_AUTO
4
IDLE_SEL
3:2 RXDET
1:0 Reserved
Type
R/W
R/W
R/W
R/W
Default
0x00
0x00
0x10
0x01
Description
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 PWDN pin control
0: Allow PWDN pin control
CRC bits [7:0]
Set bits to 0.
Set bit to 1.
1: Enables high speed channel control via SMBus
registers without CRC
0: Channel control via SMBus registers requires
correct CRC in Reg 0x05
Note: In order to change VOD, DEM and EQ of the
channels in slave mode without also setting CRC
each time, set this bit to 1.
Set bits to 0.
Set bit to 0.
Self clearing reset for SMBus registers. Writing a [1]
will return register settings to default values.
Self clearing reset to SMBus master state machine
R/W 0x00
R/W 0x00
Set bits to 0 0001'b.
Set bit to 0.
1: Block SD_TH pin control
0: Allow SD_TH pin control
Set bit to 0.
1: IDLE control by registers
0: IDLE control by signal detect
1: Block RXDET pin control
0: Allow RXDET pin control
1: Block MODE pin control
0: Allow MODE pin control
Set bit to 0.
Set bit to 0.
Set bits to 0.
1: Automatic IDLE detect
0: Allow IDLE_SEL control in bit 4
Note: override IDLE control.
1: Output is MUTED (electrical idle)
0: Output is ON
Note: override IDLE control.
00: Input is high-z impedance
01: Auto RX-Detect,
outputs test every 12 ms for 600 ms (50 times) then
stops; termination is high-z until detection; once
detected input termination is 50 Ω
10: Auto RX-Detect,
outputs test every 12 ms until detection occurs;
termination is high-z until detection; once detected
input termination is 50 Ω
11: Input is 50 Ω
Note: override RXDET pin.
Set bits to 0.
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