GC1115 Datasheet, PDF (49/80 Pages) Texas Instruments – Crest Factor Reduction Processor

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GC1115
SLWS144 – FEBRUARY 2005
SNAP_A_SYNC 0x24 (36)
Type: Read/Write
Value at RESET: 0x0000
The SNAP_A_SYNC register determines the synchronization source for the GC1115’s Snapshot RAM A. After
the appropriate SNAP_A registers (from SNAP_A_CONTROL to SNAP_A_HISTCOUNT) have been initialized, a
SNAP_A_SYNC trigger enables Snapshot RAM A. Snapshot RAM A can be triggered either by software or by
hardware. If a particular Snapshot RAM A timing relationship must be established with the input samples,
SNAP_A_SYNC should be associated with SYNC_A or SYNC_B. Alternately, the microprocessor or DSP can
initiate a Snapshot RAM A capture by assigning SW_TRIGGER as the SNAP_A_SYNC event. Snapshot RAM A
and Snapshot RAM B can operate simultaneously, and both may be triggered by the same SYNC event.
NOTE:
SNAP_A_SYNC cannot be associated with a repeating TIMER trigger.
BITS
[2:0]
[15:3]
SNAP_A_SYNC
selection:
0: NEVER
3: SYNC_A
6: invalid
Reserved
DESCRIPTION
1: SW_TRIGGER
4: SYNC_B
7: invalid
2: TIMER
5: ALWAYS
SNAP_B_SYNC 0x25 (37) Type: Read/Write Value at RESET: 0x0000
The SNAP_B_SYNC register determines the synchronization source for the GC1115’s Snapshot RAM B. After
the appropriate SNAP_B registers (from SNAP_B_CONTROL to SNAP_B_HISTCOUNT) have been initialized, a
SNAP_B_SYNC trigger enables Snapshot RAM B. Snapshot RAM B can be triggered either by software or by
hardware. If a particular Snapshot RAM B timing relationship must be established with the input samples,
SNAP_B_SYNC should be associated with SYNC_A or SYNC_B. Alternately, the microprocessor or DSP can
initiate a Snapshot RAM B capture by assigning SW_TRIGGER as the SNAP_B_SYNC event. Snapshot RAM A
and Snapshot RAM B can operate simultaneously, and both may be triggered by the same SYNC event.
NOTE:
SNAP_B_SYNC cannot be associated with a repeating TIMER trigger.
BITS
[2:0]
[15:3]
SNAP_B_SYNC selection:
0: NEVER
3: SYNC_A
6: invalid
Reserved
DESCRIPTION
1: SW_TRIGGER
4: SYNC_B
7: invalid
2: TIMER
5: ALWAYS
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