DS125MB203_15 Datasheet, PDF (27/54 Pages) Texas Instruments – Low-Power 12.5-Gbps Dual-Lane 2:1/1:2 Mux/Buffer

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ADDRESS
REGISTER
NAME
BIT
7:6
5:4
0x2B
CH4
D_IN0 – S_OUTA0
RXDET
3:2
0x2C
0x2D
1:0
CH4
D_IN0 – S_OUTA0
7:0
EQ
7
6
5:3
CH4
D_IN0 – S_OUTA0
VOD
2:0
DS125MB203
SNLS432C – OCTOBER 2012 – REVISED DECEMBER 2015
Table 7. SMBUS Slave Mode Register Map (continued)
FIELD
Reserved
Reserved
RXDET
Reserved
TYPE DEFAULT
R/W
0x00
EEPROM
REG BIT
Yes
Yes
DESCRIPTION
Set bits to 0
Set bits to 0
00'b = Input is Hi-Z impedance
01'b = Auto Rx-Detect,
outputs test every 12 ms for 600 ms (50 times) then stops; termination is Hi-
Z until detection; once detected input termination is 50 Ω
10'b = Auto Rx-Detect,
outputs test every 12 ms until detection occurs; termination is Hi-Z until
detection; once detected input termination is 50 Ω
11'b = Input is 50 Ω
Note: Override RXDET pin and enable register control through Reg 0x08[3]
Set bits to 0
EQ Control
R/W
0x2F
Yes
EQ control - total of 256 levels.
See Table 2.
Short Circuit
Protection
MODE Control
Reserved
R/W
0xAD
VOD Control
Yes
1 = Enable the short circuit protection
0 = Disable the short circuit protection
1 = PCIe GEN 1/2, 10GE
Yes
0 = PCIe GEN 3, 10G-KR
Note: override the MODE pin in Reg_08.
Yes
Set bits to 101'b
VOD control:
000'b = 0.6 V
001'b = 0.7 V
010'b = 0.8 V
Yes
011'b = 0.9 V
100'b = 1.0 V
101'b = 1.1 (default)
110'b = 1.2
111'b = 1.3
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