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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
Module: SYS_DPLL_XO
Configure the system DPLL oscillator XO_DPLL frequency.
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.
SYS_DPLL_XO.XO_FREQ
System oscillator (XO_DPLL) Frequency in Hz is M / N.
ALERT_CFG.SYS_ALERT_MASK Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
RESERVED
N/A
-
This field must not be modified from the read value
SYS_APLL_LOSS_LOCK_
MASK[2]
R/W
0
System APLL loss lock event enable mask.
If enabled, GPIO alert becomes active when sys_apll_loss_lock_sticky bit is set.
0 = disabled
1 = enabled
DPLL_SYS_HOLDOVER_
MASK[1]
R/W
0
System DPLL holdover transition event enable mask.
If enabled, GPIO alert becomes active when
dpll_sys_holdover_state_change_sticky bit is set.
0 = disabled
1 = enabled
DPLL_SYS_LOCK_MASK[
0]
R/W
0
System DPLL locked transition event enable mask.
If enabled, GPIO alert becomes active when dpll_sys_lock_state_change_sticky
bit is set.
0 = disabled
1 = enabled
Table 144: SYS_DPLL_XO Register Index
Offset
(Hex)
Register Module Base Address: C194h
Individual Register Name
Register Description
000h
XO_DPLL frequency in Hz.
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
000h
M[7:0]
001h
M[15:8]
002h
M[23:16]
003h
M[31:24]