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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
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Module: SYS_DPLL
Configure the system DPLL.
Table 220: DPLL_0.DPLL_MODE Bit Field Locations and Descriptions
Offset
Address
(Hex)
DPLL_0.DPLL_MODE Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
037h
RESERVED[
7]
WRITE_TIM
ER_MODE[6]
PLL_MODE[5:3]
STATE_MODE[2:0]
DPLL_0.DPLL_MODE Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
RESERVED
N/A
-
This field must not be modified from the read value
WRITE_TIMER_MODE[6]
R/W
0
Write phase or write frequency timer mode.
This bit selects simple holdover or advanced holdover for DPLL once the write
timer expires.
0 = simple holdover mode
1 = advanced holdover mode
PLL_MODE[5:3]
R/W
0
DPLL operation mode.
0 = PLL mode
1 = write phase mode
2 = write frequency mode
3 = GPIO inc/dec mode
4 = synthesizer mode (DPLL disabled)
5 = phase measurement mode
STATE_MODE[2:0]
R/W
0
DPLL state machine transition mode.
0 = automatic
1 = force lock
2 = force freerun
3 = force holdover