DS125BR800 Datasheet, PDF (29/59 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel Repeater With Input Equalization and Output De-Emphasis

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Register Maps (continued)
Address Register Name
Bit
0x15
CH1 - CHB1
7:6
IDLE, RXDET
5
4
3:2
1:0
0x16
CH1 - CHB1
7:0
EQ
0x17
CH1 - CHB1
7
VOD
6
5:3
2:0
DS125BR800
SNLS426E – AUGUST 2012 – REVISED JANUARY 2015
Table 10. SMBUS Slave Mode Register Map (continued)
Field
Reserved
IDLE_AUTO
IDLE_SEL
RXDET
Type
R/W
Default
0x00
Reserved
EQ Control
R/W
Short Circuit Protection R/W
MODE_SEL
0x2F
0xAD
Reserved
VOD Control
EEPROM Bit
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Description
Set bits to 0.
1 = Allow IDLE_SEL control in bit 4
0 = Automatic IDLE detect
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.
IB1 EQ Control - total of 256 levels.
See Table 2.
1: Enable the short circuit protection
0: Disable the short circuit protection
1: PCIe Gen-1 or PCIe Gen-2
0: PCIe Gen-3
Note: override the MODE pin.
Set bits to default value - 101.
OB1 VOD Control
000: 0.7 V
001: 0.8 V
010: 0.9 V
011: 1.0 V
100: 1.1 V
101: 1.2 V (default)
110: 1.3 V
111: 1.4 V
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