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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
SYS_APLL.SYS_APLL_CFG_2
Sets APLL configuration register 2.
PFD_RESET_CS[1]
R/W
0
Reset to 2.5V current steering PFD.
Reset must be high for 3.3V VDDA operation, low for 2.5V VDDA operation.
PFD_RESET_SS_1[0]
R/W
0
Reset to 3.3V source switching PFD #1.
Reset must be high for 2.5V VDDA operation, low for 3.3V VDDA operation.
Table 150: SYS_APLL.SYS_APLL_CFG_2 Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_APLL.SYS_APLL_CFG_2 Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
003h
RESERVED[
7]
PFD_RESET
_SS_2[6]
CP_CS_500
U_ENABLE[5
]
CP_CS_250
U_ENABLE[4
]
CP_CS_125
U_ENABLE[3
]
CP_CS_CURRENT[2:0]
SYS_APLL.SYS_APLL_CFG_2 Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
RESERVED
N/A
-
This field must not be modified from the read value
PFD_RESET_SS_2[6]
R/W
0
Reset to 3.3V source switching PFD #2.
Reset must be high for 2.5V VDDA operation, low for 3.3V VDDA operation.
CP_CS_500U_ENABLE[5]
R/W
0
Enable current steering charge pump 500uA gain control.
Enable 500uA current source for cs charge pump. For use in 2.5V VDDA
operation.
CP_CS_250U_ENABLE[4]
R/W
0
Enable current steering charge pump 250uA gain control.
Enable 250uA current source for cs charge pump. For use in 2.5V VDDA
operation
CP_CS_125U_ENABLE[3]
R/W
0
Enable current steering charge pump 125uA gain control.
Enable 125uA current source for cs charge pump. For use in 2.5V VDDA
operation.
CP_CS_CURRENT[2:0]
R/W
0
Control bias current for current steering charge pump.
Reference current for 2.5V VDDA operation. 125uA steps. 0 = 125uA, 7 =
1000uA.
SYS_APLL.SYS_APLL_CFG_1 Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description