DS125RT410_15 Datasheet, PDF (46/58 Pages) Texas Instruments – Low-Power Multi-Rate Quad Channel Retimer

DS125RT410
SNLS459A – APRIL 2013 – REVISED OCTOBER 2015
www.ti.com
Table 15. Channel Registers (continued)
ADDRESS
(HEX)
6B
6C
6D
6E
BITS
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
DEFAULT
VALUE
(Hex)
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
MODE
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
EEPROM
FIELD NAME
Y
FOM_A7
Y
FOM_A6
Y
FOM_A5
Y
FOM_A4
Y
FOM_A3
Y
FOM_A2
Y
FOM_A1
Y
FOM_A0
Y
FOM_B7
Y
FOM_B6
Y
FOM_B5
Y
FOM_B4
Y
FOM_B3
Y
FOM_B2
Y
FOM_B1
Y
FOM_B0
Y
FOM_C7
Y
FOM_C6
Y
FOM_C5
Y
FOM_C4
Y
FOM_C3
Y
FOM_C2
Y
FOM_C1
Y
FOM_C0
Y
EN_NEW_FOM_CTLE
6
0
RW
Y
RESERVED
5:1
0
RW
N
RESERVED
0
0
RW
N
GET_HV_ST_FRC_EN
6F
7:5
0
RW
Y
RESERVED
4:0
0
RW
N
RESERVED
70
7:4
0
RW
N
RESERVED
3
0
RW
N
RESERVED
2
0
RW
Y
EQ_LB_CNT2
1
1
RW
Y
EQ_LB_CNT1
0
1
RW
Y
EQ_LB_CNT0
71
7:6
0
RW
N
RESERVED
5
0
R
N
RESERVED
4
0
R
N
RESERVED
3
0
R
N
RESERVED
2
0
R
N
RESERVED
1
0
R
N
RESERVED
0
0
R
N
RESERVED
DESCRIPTION
Alternate Figure of Merit variable A. Max value for this register is
128, do not use the MSB
HEO adjustment for Alternate FoM, variable B
VEO adjustment for Alternate FoM, variable C
1: CTLE adaption state machine will use the alternate FoM
HEO_ALT = (HEO-B)*A*2 VEO_ALT = (VEO-C)*(1-A)*2
The values of A,B,C are set in channel register 0x6B, 0x6C, and
0x6D. The value of A is equal to the register value divided by 128.
The Alternate FoM = (HEOB)* A*2 + (VEO-C)*(1-A)*2
This feature is reserved for future use.
CTLE look beyond count for adaption
46
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