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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
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.
Table 221: SYS_DPLL Register Index
Offset
(Hex)
Register Module Base Address: C5B8h
Individual Register Name
Register Description
000h
Reference switching configuration and forced lock reference selection.
001h
SYS_DPLL.SYS_DPLL_UPDATE_RATE_CFG
System DPLL loop filter update rate configuration.
002h
SYS_DPLL.SYS_DPLL_FILTER_STATUS_UPD
ATE_CFG
System DPLL loop filter status update configuration.
003h
Phase lock threshold.
004h
Phase lock monitor duration.
005h
Frequency lock threshold.
006h
Frequency lock monitor duration.
007h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_0
Select input for highest (0) priority.
008h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_1
Select input for priority 1.
009h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_2
Select input for priority 2.
00Ah
SYS_DPLL.SYS_DPLL_REF_PRIORITY_3
Select input for priority 3.
00Bh
SYS_DPLL.SYS_DPLL_REF_PRIORITY_4
Select input for priority 4.
00Ch
SYS_DPLL.SYS_DPLL_REF_PRIORITY_5
Select input for priority 5.
00Dh
SYS_DPLL.SYS_DPLL_REF_PRIORITY_6
Select input for priority 6.
00Eh
SYS_DPLL.SYS_DPLL_REF_PRIORITY_7
Select input for priority 7.
00Fh
SYS_DPLL.SYS_DPLL_REF_PRIORITY_8
Select input for priority 8.
010h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_9
Select input for priority 9.
011h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_10
Select input for priority 10.
012h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_11
Select input for priority 11.
013h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_12
Select input for priority 12.
014h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_13
Select input for priority 13.
015h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_14
Select input for priority 14.
016h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_15
Select input for priority 15.
017h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_16
Select input for priority 16.
018h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_17
Select input for priority 17.
019h
SYS_DPLL.SYS_DPLL_REF_PRIORITY_18
Select input for priority 18.
01Ah
RESERVED
This register must not be modified from the read value
01Bh
Reference selection configuration.
01Ch
System DPLL state machine transition mode.