DS125BR800A Datasheet, PDF (30/53 Pages) Texas Instruments – Low-Power 12.5-Gbps 8-Channel (Unidirectional) Repeater With Input Equalization

DS125BR800A
SNLS467 – NOVEMBER 2013
0x2E
CH4 - CHA0
DEM
0x2F
CH4 - CHA0
IDLE Threshold
0x32
CH5 - CHA1
IDLE, RXDET
0x33
CH5 - CHA1
EQ
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Table 11. SMBUS Slave Mode Register Map (continued)
7
RXDET STATUS R
0x02
6:5 MODE_DET
R
STATUS
4:3 Reserved
R/W
2:0 DEM Control
R/W
7:4 Reserved
3:2 IDLE tha
R/W 0x00
1:0 IDLE thd
7:6 Reserved
5
IDLE_AUTO
4
IDLE_SEL
3:2 RXDET
R/W 0x00
1:0 Reserved
7:0 EQ Control
R/W 0x2F
Observation bit for RXDET CH4 - CHA0.
1: RX = detected
0: RX = not detected
Observation bit for MODE_DET CH4 - CHA0.
00: GEN1 (2.5G)
01: GEN2 (5G)
11: GEN3 (8G)
Note: Only functions when Mode pin = Automatic
Set bits to 0.
OA0 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.
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 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.
IA1 EQ Control - total of 256 levels.
See Table 3.
30
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