DS125BR820 Datasheet, PDF (28/62 Pages) Texas Instruments – Low-Power 12.5 Gbps 8-Channel Linear Repeater

DS125BR820
SNLS491B – JULY 2014 – REVISED FEBRUARY 2015
www.ti.com
Address
0x09
Register
Name
Reserved
0x0A
Signal Detect
Monitor
0x0B
0x0C-
0x0D
Reserved
Reserved
0x0E
CH0 - CHB_0
RXDET
0x0F
CH0 - CHB_0
EQ
0x10
CH0 - CHB_0
VOD
Table 9. SMBus Slave Mode Register Map (continued)
Bit
Field
Type Default
EEPROM
Reg Bit
Description
7:0 Reserved R/W 0x00
Set bits to 0
7:0 SD_TH Status R 0x00
CH7 - CH0 Internal Signal Detect Indicator
[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
0 = Signal detected at input
1 = Signal not detected at input
Note: These bits only function when RESERVED2 pin =
FLOAT
7
Reserved R/W 0x00
Set bit to 0
6:0 Reserved R/W 0x70
Yes Set bits to 111 0000'b
7:0 Reserved R/W 0x00
Set bits to 0
7:6 Reserved
5:4 Reserved
R/W 0x00
3:2
RXDET
1:0 Reserved
7:0 EQ Control R/W 0x2F
7
Short Circuit
Protection
6:3 Reserved
R/W 0xAD
2:0 VOD Control
Set bits to 0
Yes Set bits to 0
00'b = Input is Hi-Z impedance
01'b = Auto Rx-Detect,
outputs test every 12 ms for 600 ms (50 times) then
stops; termination is Hi-Z until detection; once detected
input termination is 50 Ω
Yes
10'b = Auto Rx-Detect,
outputs test every 12 ms until detection occurs;
termination is Hi-Z until detection; once detected input
termination is 50 Ω
11'b = Input is 50 Ω
Note: Override RXDET pin and enable register control
via Reg 0x08[3]
Set bits to 0
Yes
INB_0 EQ Control - total of four levels.
See Table 4.
Yes
1 = Enable the short circuit protection
0 = Disable the short circuit protection
Yes Set bits to 0101'b
OUTB_0 VOD Control: VOD / VID Ratio
000'b = 0.57
001'b = 0.65
010'b = 0.71
Yes 011'b = 0.77
100'b = 0.83
101'b = 0.90 (default)
110'b = 1.00 (recommended)
111'b = 1.04
28
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated