Datasheet

AD9548 Data Sheet
Rev. E | Page 60 of 112
REGISTER MAP
The register addresses and defaults are hexadecimal values. Use the default value when writing to registers and/or bits marked as unused.
Table 36.
Addr Opt Name D7 D6 D5 D4 D3 D2 D1 D0 Def
Serial Port Control and Part Identification
0x0000 E SPI control
Unidirec-
tional
LSB first/
Inc Addr
Soft reset Long
instruction
Unused 0x10
0x0000 Dup I
2
C control Unused Soft reset Unused 0x00
0x0001 E Reserved Unused
0x 0002 R Reserved Silicon revision number 0xC6
0x 0003 R Device ID 0x48
0x 0004 E Readback Unused Read buffer
register
0x00
0x0005 A, E I/O update Unused I/O update 0x00
System Clock (SYSCLK)
0x0100 S External
loop filter
enable
Charge
pump
mode
(auto/
man)
Charge pump current [2:0] Lock detect
timer
disable
Lock detect divider [1:0] 0x18
S N-divider [7:0] 0x28
0x0102 S Unused M-divider
reset
M-divider [1:0] 2×frequency
multiplier
enable
PLL enable SYSCLK reference select
[1:0]
0x45
0x0103 C Nom SYSCLK
period
Nominal system clock period (femtoseconds) [15:0]
[1 ns @ 1 ppm accuracy]
0x40
0x 0104 C 0x42
0x 0105 C Unused Nominal system clock period [20:16] 0x0F
0x0106 C System clock
stability
System clock stability period (milliseconds) [15:0] 0x01
0x0107 C 0x00
0x0108 C Unused System clock stability period (milliseconds) [19:16] 0x00
General Configuration
0x0200 S M0 M0 in/out M0 function [6:0] 0x00
0x0201 S M1 M1 in/out M1 function [6:0] 0x00
0x0202 S M2 M2 in/out M2 function [6:0] 0x00
0x0203 S M3 M3 in/out M3 function [6:0] 0x00
0x0204 S M4 M4 in/out M4 function [6:0] 0x00
0x0205 S M5 M5 in/out M5 function [6:0] 0x00
0x0206 S M6 M6 in/out M6 function [6:0] 0x00
0x0207 S M7 M7 in/out M7 function [6:0] 0x00
0x0208 C IRQ pin
output mode
Unused IRQ pin output mode [1:0] 0x00
0x0209
C
IRQ mask
Unused
SYSCLK
unlocked
SYSCLK
locked
Unused
Unused
SYSCLK Cal
complete
SYSCLK Cal
started
0x00
0x020A C Unused Distribution
sync
Watchdog
timer
EEPROM
fault
EEPROM
complete
0x00
0x020B
C
Switching
Closed
Freerun
Holdover
Freq
unlocked
Freq
locked
Phase
unlocked
Phase
locked
0x00
0x020C C Unused History
updated
Frequency
unclamped
Frequency
clamped
Phase slew
unlimited
Phase slew
limited
0x00
0x020D C Ref AA
new profile
Ref AA
validated
Ref AA fault
cleared
Ref AA fault Ref A
new profile
Ref A
validated
Ref A
fault
cleared
Ref A
fault
0x00
0x020E C Ref BB
new profile
Ref BB
validated
Ref BB
fault
cleared
Ref BB
fault
Ref B
new profile
Ref B
validated
Ref B
fault
cleared
Ref B
fault
0x00
0x020F C Ref CC
new profile
Ref CC
validated
Ref CC
fault
cleared
Ref CC
fault
Ref C
new profile
Ref C
validated
Ref C
fault
cleared
Ref C
fault
0x00
0x0210 C Ref DD
new profile
Ref DD
validated
Ref DD
fault
cleared
Ref DD
fault
Ref D
new profile
Ref D
validated
Ref D
fault
cleared
Ref D
fault
0x00