DS110RT410_15 Datasheet, PDF (33/60 Pages) Texas Instruments – Low-Power Multi-Rate Quad Channel Retimer

www.ti.com
DS110RT410
SNLS460A – MAY 2013 – REVISED OCTOBER 2015
REGISTER (Hex)
Table 10. CTLE Settings for Adaptation (continued)
BITS 7:6 (CTLE BITS 5:4 (CTLE BITS 3:2 (CTLE BITS 1:0 (CTLE
Stage 0)
Stage 1)
Stage 2)
Stage 3)
CTLE BOOST
STRING
5B
1
3
1
1
1311
5C
3
1
1
1
3111
5D
2
1
2
1
2121
5E
2
1
1
2
2112
5F
2
2
1
1
2211
CTLE
ADAPTATION
INDEX
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.
7.5.22 Setting the Output Differential Voltage
Register 0x2d, bits 2:0
There are eight levels of output differential voltage available in the DS110RT410, 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 listed in Table 11.
BIT 2, drv_sel_vod[2]
0
0
0
0
1
1
1
1
Table 11. VOD Settings
BIT 1, drv_sel_vod[1]
Bit 0, drv_sel_vod[0]
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
SELECTED VOD (V, PEAK-TO-PEAK,
DIFFERENTIAL)
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
7.5.23 Setting the Output De-Emphasis Setting
Register 0x15, bits 2:0 and bit 6
Fifteen output de-emphasis settings are available in the DS110RT410, ranging from 0 dB to -12 dB. The de-
emphasis values come from register 0x15, bits 2:0, which make up the bit field dvr_dem<2:0>, and register 0x15,
bit 6, which is the third de-emphasis setting bit.
The available driver de-emphasis settings and the mapping to these bits are listed in Table 12.
REGISTER 0x15,
Bit 2, dvr_dem[2]
0
0
0
0
0
0
0
Table 12. Driver De-Emphasis Settings
REGISTER 0x15,
Bit 1, drv_dem[1]
0
0
0
1
1
1
1
REGISTER 15,
Bit 0, drv_dem[0]
0
1
1
0
0
1
1
REGISTER 0x15,
Bit 6, drv_dem_range
X
1
0
1
0
1
0
DE-EMPHASIS
SETTING (dB)
0.0
–0.9
–1.5
–2.0
–2.8
–3.3
–3.5
Copyright © 2013–2015, Texas Instruments Incorporated
Product Folder Links: DS110RT410
Submit Documentation Feedback
33