Datasheet

Data Sheet AD9557
Rev. B | Page 63 of 92
Reg
Addr
(Hex)
Opt Name D7 D6 D5 D4 D3 D2 D1 D0 Def
Read-Only Status (Accessible During EEPROM Transactions)
0x0D00 R, L EEPROM Reserved
Pin
program
ROM load
process
Fault
detected
Load in
progress
Save in
progress
N/A
0x0D01 R, L
SYSCLK and
PLL status
Reserved
DPLL_APLL_
lock
All PLLs
locked
APLL VCO
status
APLL cal
in process
APLL lock
SYSCLK
stable
SYSCLK
lock detect
N/A
0x0D02 R, L
IRQ monitor
events
Reserved
SYSCLK
unlocked
SYSCLK
locked
APLL
unlocked
APLL lock
detected
APLL cal
ended
APLL cal
started
N/A
0x0D03 R, L Reserved
Pin program
end
Output dist
sync
Watchdog
timer
EEPROM
fault
EEPROM
complete
N/A
0x0D04 R, L Switching Closed Freerun Holdover
Frequency
unlocked
Frequency
locked
Phase
unlocked
Phase
locked
N/A
0x0D05 R, L Reserved
History
updated
Frequency
unclamped
Frequency
clamped
Phase slew
unlimited
Phase slew
limited
N/A
0x0D06 R, L Reserved
REFB
validated
REFB fault
cleared
REFB fault Reserved
REFA
validated
REFA fault
cleared
REFA fault N/A
0x0D07 R, L Reserved N/A
0x0D08 R DPLL Reserved
Offset slew
limiting
Frequency
lock
Phase lock
Loop
switching
Holdover Active Freerun N/A
0x0D09 R Reserved
Frequency
clamped
History
available
Active reference priority Reserved
Current
active
reference
N/A
0x0D0A R Reserved N/A
0x0D0B R REFA/REFB B valid B fault B fast B slow A valid A fault A fast A slow N/A
0x0D0C R Reserved N/A
0x0D0D R
Holdover
history
Tuning word readback[31:0] N/A
0x0D0E R N/A
0x0D0F R N/A
0x0D10 R N/A
0x0D11 R
Lock
detector
phase tub
Phase tub [7:0] N/A
0x0D12 R Reserved Phase tub[11:8] N/A
0x0D13 R
Lock
detector
frequency
tub
Frequency tub[7:0] N/A
0x0D14 R Reserved Frequency tub[11:8] N/A
Nonvolatile Memory (EEPROM) Control
0x0E00 E
Write
protect
Reserved
Write
enable
00
0x0E01 E Condition Reserved Conditional value[3:0] 00
0x0E02 A, E Save Reserved
Save to
EEPROM
00
0x0E03 A, E Load Reserved
Load from
EEPROM
Reserved 00