DS125BR401SQ Datasheet, PDF (28/52 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
0x25
CH3 - CHB3
VOD
Bit
7
6
Field
Short Circuit
Protection
MODE_SEL
5:3 Reserved
2:0 VOD Control
0x26
CH3 - CHB3
DEM
7
RXDET STATUS
6:5 MODE_DET
STATUS
4:3 Reserved
2:0 DEM Control
0x27
CH3 - CHB3
IDLE Threshold
7:4 Reserved
3:2 IDLE thd
1:0 IDLE tha
Type
R/W
R
R
R/W
R/W
R/W
Default
0xAD
0x02
0x00
Description
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.
OB0 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
Observation bit for RXDET CH3 - CHB3.
1: RX = detected
0: RX = not detected
Observation bit for MODE_DET CH3 - CHB3.
00: GEN1 (2.5G)
01: GEN2 (5G)
11: GEN3 (8G+)
Set bits to 0.
OB3 DEM Control
000: 0 dB
001: –1.5 dB
010: –3.5 dB (default)
011: –5 dB
100: –6 dB
101: –8 dB
110: –9 dB
111: –12 dB
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.
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