DS80PCI402 Datasheet, PDF (22/39 Pages) Texas Instruments – 2.5 Gbps / 5.0 Gbps / 8.0 Gbps 4 Lane PCI Express Repeater with Equalization and De-Emphasis

0x08
Override
Pin Control
0x0E
CH0 - CHB0
IDLE, RXDET
0x0F
0x10
CH0 - CHB0
EQ
CH0 - CHB0
VOD
7
Reserved
R/W 0x00 Set bit to 0.
6
Override SD_TH
1: Block SD_TH pin control
0: Allow SD_TH pin control
5
Reserved
Set bit to 0.
4
Override IDLE
1: IDLE control by registers
0: IDLE control by signal detect
3
Override RXDET
1: Block RXDET pin control
0: Allow RXDET pin control
2
Override RATE
1: Block RATE pin control
0: Allow RATE pin control
1
Reserved
Set bit to 0.
0
Reserved
Set bit to 0.
7:6 Reserved
R/W 0x00 Set bits to 0.
5
IDLE_AUTO
1: Automatic IDLE detect
0: Allow IDLE_SEL control in bit 4
Note: override IDLE control.
4
IDLE_SEL
1: Output is MUTED (electrical idle)
0: Output is ON
Note: override IDLE control.
3:2 RXDET
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.
1:0 Reserved
Set bits to 0.
7:0 EQ Control
R/W 0x2F
IB0 EQ Control - total of 256 levels.
See Table 2: Equalizer Settings.
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
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
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