DS125DF410_13 Datasheet, PDF (39/44 Pages) Texas Instruments – DS125DF410 Low Power Multi-Rate Quad Channel Retimer

DS125DF410
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SNLS398E – JANUARY 2012 – REVISED MAY 2013
Setting the Output De-emphasis Setting
Register 0x15, bits 2:0 and bit 6
Fifteen output de-emphasis settings are available in the DS125DF410, ranging from 0 dB to -15 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 shown in Table 16.
Register 0x15, Bit 2,
dvr_dem[2]
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table 16. Driver De-Emphasis Settings
Register 0x15, Bit 1,
drv_dem[1]
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Register 15, Bit 0,
drv_dem[0]
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Register 0x15, Bit 6,
drv_dem_range
X
1
0
1
0
1
0
1
0
1
0
1
0
1
0
De-emphasis Setting
(dB)
0.0
-1.5
-2.0
-3.5
-4.2
-5.0
-6.0
-6.5
-7.2
-8.0
-9.0
-9.5
-11.0
-13.0
-15.0
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