Datasheet

Data Sheet AD9558
Rev. B | Page 95 of 104
Table 105. IRQ Monitor for the Digital PLL
Address Bits Bit Name Description
0x0D04 7 Switching Indicates that the DPLL is switching to a new reference
6
Closed
Indicates that the DPLL has entered closed-loop operation
5 Freerun Indicates that the DPLL has entered free run mode
4
Holdover Indicates that the DPLL has entered holdover mode
3
Frequency unlocked Indicates that the DPLL has lost frequency lock
2
Frequency locked Indicates that the DPLL has acquired frequency lock
1
Phase unlocked Indicates that the DPLL has lost phase lock
0
Phase locked Indicates that the DPLL has acquired phase lock
Table 106. IRQ Monitor for History Update, Frequency Limit, and Phase Slew Limit
Address Bits Bit Name Description
0x0D05 [7:5] Reserved Reserved
4
History updated Indicates the occurrence of a tuning word history update
3
Frequency unclamped Indicates a frequency limiter state transition from clamped to unclamped
2
Frequency clamped Indicates a frequency limiter state transition from unclamped to clamped
1
Phase slew unlimited
Indicates a phase slew limiter state transition from slew limiting to not slew limiting
0 Phase slew limited Indicates a phase slew limiter state transition from not slew limiting to slew limiting
Table 107. IRQ Monitor for Reference Inputs
Address Bits Bit Name Description
0x0D06
7 Reserved Reserved
6
REFB validated Indicates that REFB has been validated
5
REFB fault cleared Indicates that REFB has been cleared of a previous fault
4
REFB fault Indicates that REFB has been faulted
3
Reserved Reserved
2
REFA validated Indicates that REFA has been validated
1
REFA fault cleared Indicates that REFA has been cleared of a previous fault
0
REFA fault Indicates that REFA has been faulted
0x0D07
7 Reserved Reserved
6
REFD validated Indicates that REFD has been validated
5
REFD fault cleared Indicates that REFD has been cleared of a previous fault
4
REFD fault Indicates that REFD has been faulted
3
Reserved
2
REFC validated Indicates that REFC has been validated
1
REFC fault cleared Indicates that REFC has been cleared of a previous fault
0
REFC fault
Indicates that REFC has been faulted