DS110RT410 Datasheet, PDF (35/40 Pages) Texas Instruments – DS110RT410 Low Power Multi-Rate Quad Channel Retimer

DS110RT410
www.ti.com
SNLS460 – MAY 2013
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 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 shown in Table 15.
Bit 2, drv_sel_vod[2]
0
0
0
0
1
1
1
1
Table 15. 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
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 de-emphasis range bit.
The available driver de-emphasis settings and the mapping to these bits are shown in Table 16.
Register 0x15, Bit 2,
dvr_dem[2]
0
0
0
0
0
1
0
1
1
0
1
1
1
1
1
Table 16. Driver De-Emphasis Settings
Register 0x15, Bit 1,
drv_dem[1]
0
0
0
1
1
0
1
0
1
1
1
0
0
1
1
Register 15, Bit 0,
drv_dem[0]
0
1
1
0
1
0
0
1
0
1
1
0
1
0
1
Register 0x15, Bit 6,
drv_dem_range
X
1
0
1
1
1
0
1
1
0
1
0
0
0
0
De-emphasis Setting
(dB)
0.0
-0.9
-1.5
-2.0
-2.8
-3.3
-3.5
-3.9
-4.5
-5.0
-5.6
-6.0
-7.5
-9.0
-12.0
Copyright © 2013, Texas Instruments Incorporated
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