DS125BR800A Datasheet, PDF (29/53 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel (Unidirectional) Repeater With Input Equalization

DS125BR800A
www.ti.com
SNLS467 – NOVEMBER 2013
0x27
0x28
0x2B
0x2C
0x2D
Table 11. SMBUS Slave Mode Register Map (continued)
CH3 - CHB3
IDLE Threshold
7:4 Reserved
3:2 IDLE tha
R/W 0x00
1:0 IDLE thd
Signal Detect Control 7
6
Reserved
R/W
Override Fast IDLE
0x4C
5:4 High IDLE
3:2 Fast IDLE
1:0 Reduced SD Gain
CH4 - CHA0
IDLE, RXDET
7:6 Reserved
5
IDLE_AUTO
R/W 0x00
4
IDLE_SEL
3:2 RXDET
CH4 - CHA0
EQ
CH4 - CHA0
VOD
1:0 Reserved
7:0 EQ Control
7
Short Circuit
Protection
6
MODE_SEL
5:3 Reserved
2:0 VOD Control
R/W 0x2F
R/W 0xAD
Set bits to 0.
Assert threshold (1010 pattern 12 Gbps)
00 = 50 mVp-p (default)
01 = 40 mVp-p
10 = 75 mVp-p
11 = 58 mVp-p
Note: override the SD_TH pin.
De-assert threshold (1010 pattern 12 Gbps)
00 = 37 mVp-p (default)
01 = 22 mVp-p
10 = 55 mVp-p
11 = 45 mVp-p
Note: override the SD_TH pin.
Set bit to 0.
Override Fast IDLE
[1]: Use values in 0x28[3:2]
[0]: Based on MODE pin
Enable higher range of Signal Detect Thresholds
[1]: CH0 - CH3
[0]: CH4 - CH7
Enable Fast OOB response
[1]: CH0 - CH3
[0]: CH4 - CH7
Enable reduced Signal Detect Gain
[1]: CH0 - CH3
[0]: CH4 - CH7
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.
IA0 EQ Control - total of 256 levels.
See Table 3.
1: Enable the short circuit protection
0: Disable the short circuit protection
1: Gen 1/2,
0: SAS-3 and PCIe Gen-3
Note: override the MODE pin.
Set bits to default value - 101.
OA0 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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