DS125RT410 Datasheet, PDF (36/42 Pages) Texas Instruments – DS125RT410 Low Power Multi-Rate Quad Channel Retimer

DS125RT410
SNLS459 – APRIL 2011
www.ti.com
Register (Hex)
40
41
42
43
44
45
46
47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
Bits 7:6 (CTLE
Stage 0)
0
0
0
0
1
0
0
2
0
0
0
1
1
3
1
2
2
2
2
1
1
2
2
3
1
1
1
1
3
2
2
2
Table 14. CTLE Settings for Adaptation
Bits 5:4 (CTLE
Stage 1)
0
0
0
1
0
0
0
0
0
0
3
0
1
0
2
1
0
0
2
0
1
0
3
0
1
1
2
3
1
1
1
2
Bits 3:2 (CTLE
Stage 2)
0
0
1
0
0
2
0
0
0
3
0
0
0
0
0
0
2
0
0
1
0
3
0
2
1
3
2
1
1
2
1
1
Bits 1:0 (CTLE
Stage 3)
0
1
0
0
0
0
2
0
3
0
0
1
0
0
0
0
0
2
0
2
2
0
0
0
3
1
1
1
1
1
2
1
CTLE Boost
String
0000
0001
0010
0100
1000
0020
0002
2000
0003
0030
0300
1001
1100
3000
1200
2100
2020
2002
2200
1012
1102
2030
2300
3020
1113
1131
1221
1311
3111
2121
2112
2211
CTLE Adaptation
Index
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
As an alternative to, or in conjunction with, writing the CTLE boost setting registers 0x40 through 0x5f, it is
possible to set the starting CTLE boost setting index. To override the default setting, which is 0, set bit 3 of
register 0x2f. When this bit is set, the starting index for adaptation comes from register 0x39, bits 4:0. This is the
index into the CTLE settings table in registers 0x40 through 0x5f. When this starting index is 0, which is the
default, CTLE adaptation starts at the first setting in the table, the one in register 0x40, and continues until the
optimum FOM is reached.
Setting the Output Differential Voltage
Register 0x2d, bits 2:0
There are eight levels of output differential voltage available in the DS125RT410, from 0.6 V to 1.3 V in 0.1 V
increments. The values drv_sel_vod[2:0] in bits 2:0 of register 0x2d set the output VOD. The available VOD
settings and the corresponding values of this bit field are shown in Table 15.
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