AD9548SLASHPCBZ datasheet(73/112 Pages) AD

73 / 112 page

AD9548

Rev. 0 | Page 73 of 112

The IRQ mask register bits form a one-to-one correspondence with the bits of the IRQ monitor register (Address 0D02 to Address 0D09).

When set to Logic 1, the IRQ mask bits enable the corresponding IRQ monitor bits to indicate an IRQ event. The default for all IRQ mask bits

is Logic 0, which prevents the IRQ monitor from detecting any internal interrupts.

Table 49. IRQ Mask for SYSCLK

Address

Bits

Bit Name

Description

0209

[7:6]

Unused

[5]

SYSCLK unlocked

Enables IRQ for indicating a SYSCLK PLL state transition from locked to unlocked

[4]

SYSCLK locked

Enables IRQ for indicating a SYSCLK PLL state transition from unlocked to locked

[3:2]

Unused

[1]

SYSCLK Cal complete

Enables IRQ for indicating that SYSCLK calibration has completed

[0]

SYSCLK Cal started

Enables IRQ for indicating that SYSCLK calibration has begun

Table 50. IRQ Mask for Distribution Sync, Watchdog Timer, and EEPROM

Address

Bits

Bit Name

Description

020A

[7:4]

Unused

[3]

Distribution sync

Enables IRQ for indicating a distribution sync event

[2]

Watchdog timer

Enables IRQ for indicating expiration of the watchdog timer

[1]

EEPROM fault

Enables IRQ for indicating a fault during an EEPROM load or save operation

[0]

EEPROM complete

Enables IRQ for indicating successful completion of an EEPROM load or save operation

Table 51. IRQ Mask for the Digital PLL

Address

Bits

Bit Name

Description

020B

[7]

Switching

Enables IRQ for indicating that the DPLL is switching to a new reference

[6]

Closed

Enables IRQ for indicating that the DPLL has entered closed-loop operation

[5]

Freerun

Enables IRQ for indicating that the DPLL has entered free-run mode

[4]

Holdover

Enables IRQ for indicating that the DPLL has entered holdover mode

[3]

Freq unlocked

Enables IRQ for indicating that the DPLL lost frequency lock

[2]

Freq locked

Enables IRQ for indicating that the DPLL has acquired frequency lock

[1]

Phase unlocked

Enables IRQ for indicating that the DPLL lost phase lock

[0]

Phase locked

Enables IRQ for indicating that the DPLL has acquired phase lock

Table 52. IRQ Mask for History Update, Frequency Limit, and Phase Slew Limit

Address

Bits

Bit Name

Description

020C

[7:5]

Unused

[4]

History updated

Enables IRQ for indicating the occurrence of a tuning word history update

[3]

Frequency unclamped

Enables IRQ for indicating a state transition frequency limiter from clamped to

unclamped

[2]

Frequency clamped

Enables IRQ for indicating a state transition of the frequency limiter from unclamped

to clamped

[1]

Phase slew unlimited

Enables IRQ for indicating a state transition of the phase slew limiter from slew

limiting to not slew limiting

[0]

Phase slew limited

Enables IRQ for indicating a state transition of the phase slew limiter from not slew

limiting to slew limiting

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