GC5316_14 Datasheet, PDF (47/76 Pages) Texas Instruments – HIGH-DENSITY DIGITAL DOWNCONVERTER AND UPCONVERTER

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GC5316
SLWS154A − JANUARY 2004 − REVISED MARCH 2004
4.3 Interrupt Handling
When a GC5316 block sets an interrupt, the interrupt pin goes active if the interrupt source is not masked. The
microprocessor should then read the three interrupt flag registers to determine the source of the interrupt. The
microprocessor then has to read the interrupt source circuits register(s) to clear the interrupt pin and interrupt flag
register bit. The three interrupt registers are listed in the global registers part of the control registers section.
4.4 Sync Signals
Various function blocks within the GC5316 need to be synchronized in order to realize predictable results. The
GC5316 provides a flexible system where each function block that requires synchronization can be independently
synchronized from either device pins or from a software one-shot. The one-shot option is setup and triggered through
control registers. The receive and transmit sections of the chip each have four hardware sync input pins available.
These sync pins are qualified on the chip’s rising clock edge.
Table 1 shows the different sync modes available for both receive and transmit sections.
Table 1. Different Sync Modes Available for Both Receive and Transmit Sections
MODE
0
1
2
3
4
5
6
7
RECEIVE SYNC SOURCE
RxSyncA
RxSyncB
RxSyncC
RxSyncD
DDC sync counter TC
DDC sync triggered by one-shot
0 (always off)
1 (always on)
TRANSMIT SYNC SOURCE
TxSyncA
TxSyncB
TxSyncC
TxSyncD
DUC sync counter TC
DUC sync triggered by one-shot
0 (always off)
1 (always on)
Table 2 through Table 5 summarize the blocks which have functions that can be synchronized using the above eight
sync options:
Table 2. Transmit Common Syncs
SYNC NAME
ssel_comp_pmeter
ssel_duc_counter
ssel_duc_serp
ssel_duc_gain
ssel_duc_pilot
ssel_duc_tadj
ssel_duc_pmeter
PURPOSE
Initializes the xmit composite power meter
Initializes the xmit common sync counter
Initializes the xmit serial interface
Updates the gain register
Initializes the xmit pilot generator and updates the pilot gain
Updates the delay adjust register
Initializes the xmit channel power meter
SYNC NAME
ssel_duc_nco
ssel_duc_freq
ssel_duc_phase
ssel_duc_dither
Table 3. Transmit Channel Syncs
Resets the NCO accumulator
Updates the NCO freq registers
Updates the NCO phase register
Resets the NCO dither
PURPOSE
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