XRS10L120_09 Datasheet, PDF (26/36 Pages) Exar Corporation – SERIAL ATA II: PORT MULTIPLIER

EXSTOR XRS10L120
SERIAL ATA II: PORT MULTIPLIER
TABLE 10: PLL CONFIGURATION (MDIO DEVICE 1, 2)
REV. 1.06
ADDRESS
HEX
N.0045
NOTE 1
BIT(S)
7:5
4
NAME
Reserved
SSCmode
TYPE
RO
R/W
DEFAULT
DESCRIPTION
0
Reserved
0
Selects position of spreading interpolator
0 = Interpolator in feedback path
1 = Interpolator in feedforward path
Set to ’1’ when SSCBypass = ’0’
3
Reserved
R/W
0
DO NOT MODIFY
2
SSCInvert
R/W
0
Inverting SSC profile - Setting for downspread per
SATA spec
Set to ’0’ when SSCmode = ’0’
Set to ’1’ when SSCmode = ’1’
1
Reserved
R/W
0
DO NOT MODIFY
0
SSCBypass
R/W
1
Bypass the saw generator and pulse density modu-
lator and get increment from SSCMax (set SSCMax
to 45 [0x2D] when SSCBypass is set to 0)
NOTE: 1) In order to enable SSC generation, set register N.0044 to 0x2D, N.0045 to 0x14 and then reset the PLL by
writing register 0.0004 to 0x0 then 0xF.
TABLE 11: BIAS GENERATOR CONFIGURATION REGISTERS (MDIO DEVICES 1 & 2)
ADDRESS
HEX
BIT(S)
NAME
TYPE
RESET VALUE
DESCRIPTION
N.0064
7:4
pr100Tx[3:0]
3:0
Reserved
RW
0x0
Transmit pre-driver current bias
1010=50uA
0010=75uA
0000=100uA
0001=125uA
1100=150uA
0111=175uA
1111=200uA
RW
0x0
DO NOT MODIFY
N.0065
7:4
Reserved
RW
0x0
DO NOT MODIFY
3:0
prcal100Tx[3:0]
RW
0x0
Transmit driver current bias
1010=50uA
0010=75uA
0000=100uA
0001=125uA
1100=150uA
0111=175uA
1111=200uA
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