DS80PCI402 Datasheet, PDF (24/39 Pages) Texas Instruments – 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 4 Lane PCI Express Repeater with Equalization and De-Emphasis

0x17
CH1 - CHB1
VOD
0x18
CH1 - CHB1
DEM
0x19
CH1 - CHB1
IDLE Threshold
7
Short Circuit
Protection
R/W 0xAD
1: Enable the short circuit protection
0: Disable the short circuit protection
6
RATE_SEL
1: Gen 1/2,
0: Gen 3
Note: override the RATE pin.
5:3 Reserved
Set bits to default value - 101.
2:0 VOD Control
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
7
RXDET STATUS R 0x02 Observation bit for RXDET CH1 - CHB1.
1: RX = detected
0: RX = not detected
6:5 RATE_DET
R
STATUS
Observation bit for RATE_DET CH1 - CHB1.
00: GEN1 (2.5G)
01: GEN2 (5G)
11: GEN3 (8G)
4:3 Reserved
R/W
Set bits to 0.
2:0 DEM Control
R/W
OB1 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
7:4 Reserved
R/W 0x00 Set bits to 0.
3:2 IDLE thd
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.
1:0 IDLE tha
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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