GC5316 datasheet(47/75 Pages) TI

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GC5316

SLWS154A − JANUARY 2004 − REVISED MARCH 2004

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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

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

RECEIVE SYNC SOURCE

TRANSMIT SYNC SOURCE

RxSyncA

TxSyncA

RxSyncB

TxSyncB

RxSyncC

TxSyncC

RxSyncD

TxSyncD

DDC sync counter TC

DUC sync counter TC

DDC sync triggered by one-shot

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

PURPOSE

ssel_comp_pmeter

Initializes the xmit composite power meter

ssel_duc_counter

Initializes the xmit common sync counter

ssel_duc_serp

Initializes the xmit serial interface

ssel_duc_gain

Updates the gain register

ssel_duc_pilot

Initializes the xmit pilot generator and updates the pilot gain

ssel_duc_tadj

Updates the delay adjust register

ssel_duc_pmeter

Initializes the xmit channel power meter

Table 3. Transmit Channel Syncs

SYNC NAME

PURPOSE

ssel_duc_nco

Resets the NCO accumulator

ssel_duc_freq

Updates the NCO freq registers

ssel_duc_phase

Updates the NCO phase register

ssel_duc_dither

Resets the NCO dither

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