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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
Module: SYS_APLL
Configure the system APLL.
Note: The order of configuring three SCSR modules, SCSR_SYS_DPLL_XO, SCSR_SYS_APLL, SCSR_SYS_DPLL, are critical. The correct
configuration order should be: SCSR_SYS_DPLL_XO, SCSR_SYS_APLL, SCSR_SYS_DPLL, and followed by other modules. Each of these
three SCSR modules should be configured completely before configuring the next module.
004h
M[39:32]
005h
M[47:40]
006h
N[7:0]
007h
N[15:8]
SYS_DPLL_XO.XO_FREQ Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
N[15:0]
R/W
0
XO_DPLL frequency N.
N is unsigned 16-bit. N must not be configured to 0.
M[47:0]
R/W
0
XO_DPLL frequency M.
M is unsigned 48-bit.
Table 146: SYS_APLL Register Index
Offset
(Hex)
Register Module Base Address: C19Ch
Individual Register Name
Register Description
000h
SYS_APLL.SYS_APLL_CP_SS_CURRENT_1
System APLL charge pump current register.
001h
SYS_APLL.SYS_APLL_CP_SS_CURRENT_2
System APLL charge pump current register.
002h
System APLL configuration register 1.
003h
System APLL configuration register 2.
004h
VREG control register.
005h
System APLL charge pump control register.
006h
System APLL charge pump control register.
007h
System APLL charge pump control register.
008h
System APLL crystal frequency in Hz.
010h
System APLL control register.
Table 145: SYS_DPLL_XO.XO_FREQ Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_DPLL_XO.XO_FREQ Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0