DS125BR401SQ Datasheet, PDF (26/52 Pages) Texas Instruments – Low-Power 12.5-Gbps 4-Lane Repeater With Input Equalization and Output De-Emphasis

DS125BR401
SNLS419C – JULY 2012 – REVISED APRIL 2013
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Table 10. SMBUS Slave Mode Register Map (continued)
Address
Register Name
0x19
CH1 - CHB1
IDLE Threshold
Bit
7:4
3:2
Field
Reserved
IDLE thd
1:0 IDLE tha
0x1C
CH2 - CHB2
IDLE, RXDET
7:6 Reserved
5
IDLE_AUTO
4
IDLE_SEL
3:2 RXDET
0x1D
0x1E
CH2 - CHB2
EQ
CH2 - CHB2
VOD
1:0 Reserved
7:0 EQ Control
7
Short Circuit
Protection
6
MODE_SEL
5:3 Reserved
2:0 VOD Control
Type
R/W
R/W
R/W
R/W
Default
0x00
0x00
0x2F
0xAD
Description
Set bits to 0.
De-assert threshold
00 = 110 mVp-p (default)
01 = 100 mVp-p
10 = 150 mVp-p
11 = 130 mVp-p
Note: override the SD_TH pin.
Assert threshold
00 = 180 mVp-p (default)
01 = 160 mVp-p
10 = 210 mVp-p
11 = 190 mVp-p
Note: override the SD_TH pin.
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.
IB2 EQ Control - total of 256 levels.
See Table 2.
1: Enable the short circuit protection
0: Disable the short circuit protection
1: Gen 1/2,
0: PCIe Gen 3
Note: override the MODE pin.
Set bits to default value - 101.
OB2 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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