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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
SYS_DPLL.SYS_DPLL_REF_MODE
Reference selection configuration.
SYS_DPLL.SYS_DPLL_REF_PRIORITY_18 Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
PRIORITY_GROUP_NUM
BER[7:6]
R/W
0
Priority group number.
For references in the same priority group, revertive switching is disabled.
PRIORITY_REF[5:1]
R/W
0
Input reference index for priority 18.
0x00 = CLK0
0x01 = CLK1
0x02 = CLK2
0x03 = CLK3
0x04 = CLK4
0x05 = CLK5
0x06 = CLK6
0x07 = CLK7
0x08 = CLK8
0x09 = CLK9
0x0A = CLK10
0x0B = CLK11
0x0C = CLK12
0x0D = CLK13
0x0E = CLK14
0x0F = CLK15
0x12 = XO_DPLL
PRIORITY_EN[0]
R/W
0
Enable reference priority 18.
Enable reference priority 18 for the automatic reference selection.
0 = disabled
1 = enabled
Table 248: SYS_DPLL.SYS_DPLL_REF_MODE Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_DPLL.SYS_DPLL_REF_MODE Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
01Bh
RESERVED[7:4]
MODE[3:0]
SYS_DPLL.SYS_DPLL_REF_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
MODE[3:0]
R/W
0
Reference selection mode.
Automatic: SYS_DPLL_0.DPLL_REF_PRIORITY_[0:16]
Manual: SYS_DPLL_MANU_REF_CFG.MANUAL_REFERENCE
0 = automatic
1 = manual