XRS10L120 Datasheet, PDF (32/52 Pages) Exar Corporation – SERIAL ATA II: 1:2 PORT MULTIPLIER

XRS10L120
PRELIMINARY
SERIAL ATA II: 1:2 PORT MULTIPLIER
TABLE 10: PLL CONFIGURATION/DEBUG REGISTERS (MDIO DEVICE 1 AND 2)
REV. P1.0.1
ADDRESS
HEX
BIT(S)
NAME
R/W
DEFAULT
DESCRIPTION
N.0045
7:5
Reserved
RO
-
Reserved
4
SSCmode
R/W
0 Selects position of spreading interpolator
0 = Interpolator in feedback path
1 = Interpolator in feedforward path
3
SSCCenter
R/W
0 Center spread instead of down/upspread
2
SSCInvert
R/W
0 Spread up instead of down
1
SSCPDMBypass R/W
0 Do not use the pulse density modulator
0
SSCBypass
R/W
1 Bypass the saw generator and pulse density modu-
lator and get increment from SSCMax (set SSCMax
to 51 when SSCBypass is set to 0)
N.0046
7
PLLQpumpOvrd
RO
-
Override for charge pump programmability
0 = use value based on FB divider
1 = use value from PLLQpump
6:0
PLLQpump[6:0]
Values based on FB divider:
FBDIV[5:0] qpump[6:0]
11XXXX => 1111110
100000 => 0001110
100001 => 0000110
100010 => 0000011
100011 => 0000010
100101 => 0000010
100111 => 0000001
101101 => 0000001
Others => 0000000
Charge Pump Programmability
000001 = Enable 1 charge pump unit
000010 = Enable 2 charge pump units
000011 = Enable 3 charge pump units
000110 = Enable 4 charge pump units
000111 = Enable 5 charge pump units
001110 = Enable 6 charge pump units
001111 = Enable 7 charge pump units
011110 = Enable 8 charge pump units
011111 = Enable 9 charge pump units
111110 = Enable 10 charge pump units
111111 = Enable 11 charge pump units
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