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©2018 Integrated Device Technology, Inc
September 12, 2018
8A3xxxx Family Programming Guide
SYS_APLL.SYS_APLL_XTAL_FREQ
Crystal (XTAL) Frequency in Hz M/N.
SYS_APLL.SYS_APLL_CTRL
System APLL control register.
Table 155: SYS_APLL.SYS_APLL_XTAL_FREQ Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_APLL.SYS_APLL_XTAL_FREQ Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
008h
M[7:0]
009h
M[15:8]
00Ah
M[23:16]
00Bh
M[31:24]
00Ch
M[39:32]
00Dh
M[47:40]
00Eh
N[7:0]
00Fh
N[15:8]
SYS_APLL.SYS_APLL_XTAL_FREQ Bit Field Descriptions
Bit Field Name
Field Type Default Value
Description
N[15:0]
R/W
0
SYS_APLL crystal frequency N.
N is unsigned 16-bit. N must not be configured to 0.
M[47:0]
R/W
0
SYS_APLL crystal frequency M.
M is unsigned 48-bit.
Table 156: SYS_APLL.SYS_APLL_CTRL Bit Field Locations and Descriptions
Offset
Address
(Hex)
SYS_APLL.SYS_APLL_CTRL Bit Field Locations
D7
D6
D5
D4
D3
D2
D1
D0
010h
APLL_FBDIV_DIVIDER[7:0]
011h
VCCA_SEL[1
5]
DOUBLER_E
NABLE[14]
APLL_FBDIV_DIVIDER[13:8]