122
©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
SYS_APLL.SYS_APLL_CFG_1
Sets APLL configuration register 1.
SYS_APLL.SYS_APLL_CP_SS_CURRENT_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
CP_3_SS_CURRENT[5:3]
R/W
0
0x0 = 125uA,
0x3 = 500uA,
0x7 = 1000uA.
Reference current for Charge Pump #3. 125uA steps. For use in 3.3V VDDA
operation. cp_1_ss_c cp_2_ss_c cp_3_ss_c
cp_4_ss_current = total cp current used to set APLL bandwidth.
CP_4_SS_CURRENT[2:0]
R/W
0
0x0 = 125uA,
0x3 = 500uA,
0x7 = 1000uA.
Reference current for Charge Pump #4. 125uA steps. For use in 3.3V VDDA
operation. cp_1_ss_c cp_2_ss_c cp_3_ss_c
cp_4_ss_current = total cp current used to set APLL bandwidth.
Table 149: SYS_APLL.SYS_APLL_CFG_1 Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_APLL.SYS_APLL_CFG_1 Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
002h
PFD_FORCE
_VC_LOW_C
S[7]
PFD_FORCE
_VC_HIGH_
CS[6]
CP_CS_OFF
SET_ENABL
E[5]
XTAL_DOUB
LE_CS[4]
CP_CS_OTA
_ENABLE[3]
CP_CS_ENA
BLE[2]
PFD_RESET
_CS[1]
PFD_RESET
_SS_1[0]
SYS_APLL.SYS_APLL_CFG_1 Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
PFD_FORCE_VC_LOW_C
S[7]
R/W
0
Force control voltage to low.
Used only as a test condition.
PFD_FORCE_VC_HIGH_
CS[6]
R/W
0
Force control voltage to high.
Used only as a test condition.
CP_CS_OFFSET_ENABL
E[5]
R/W
0
Enable current steering offset current in 2.5V VDDA mode.
Only used for trim.
XTAL_DOUBLE_CS[4]
R/W
0
Double XTAL frequency for 2.5V power supply.
Set high if doubler is enabled. For both 2.5V and 3.3V VDDA operation.
CP_CS_OTA_ENABLE[3]
R/W
0
Enable operational transconductance amplifier (OTA) in CP.
1 = 2.5V VDDA operation. 0 = 3.3V VDDA operation.
CP_CS_ENABLE[2]
R/W
0
Enable current steering charge pump.
Must be high for 2.5V VDDA operation, low for 3.3V VDDA operation.