DS125BR401SQ Datasheet, PDF (27/52 Pages) Texas Instruments – Low-Power 12.5-Gbps 4-Lane Repeater With Input Equalization and Output De-Emphasis

DS125BR401
www.ti.com
SNLS419C – JULY 2012 – REVISED APRIL 2013
Table 10. SMBUS Slave Mode Register Map (continued)
Address
Register Name
0x1F
CH2 - CHB2
DEM
Bit
Field
7
RXDET STATUS
6:5 MODE_DET
STATUS
4:3 Reserved
2:0 DEM Control
0x20
CH2 - CHB2
IDLE Threshold
7:4 Reserved
3:2 IDLE thd
1:0 IDLE tha
0x23
CH3 - CHB3
IDLE, RXDET
7:6 Reserved
5
IDLE_AUTO
4
IDLE_SEL
3:2 RXDET
0x24
CH3 - CHB3
EQ
1:0 Reserved
7:0 EQ Control
Type
R
R
R/W
R/W
R/W
R/W
R/W
Default
0x02
0x00
0x00
0x2F
Description
Observation bit for RXDET CH2 - CHB2.
1: RX = detected
0: RX = not detected
Observation bit for MODE_DET CH2 - CHB2.
00: GEN1 (2.5G)
01: GEN2 (5G)
11: GEN3 (8G+)
Set bits to 0.
OB2 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.
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.
IB3 EQ Control - total of 256 levels.
See Table 2.
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