Receive Path - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual


The
SPORTx_DA
port is enabled as transmitter (
control register), unless it is in multichannel mode and an inactive
time slot occurs.
When the SPORT is configured as a transmitter (
and buffers, and the channel transmit shift registers respond to
TXSPxB
and
SPORTx_CLK
buffers, and the receive shift registers are inactive and do not
RXSPxB
respond to
SPORTx_CLK
inactive, reading from an empty buffer causes the core to hang
indefinitely.
When the SPORT is configured as a transmitter (
mit buffers are activated. The transmit buffers act like a two-location
FIFO because they have one data registers plus an output shift register.

Receive Path

If the serial data signal is configured as a serial receiver (
receive portion of the SPORT shifts in data from the
signal, synchronous to the
SPORTx_DB
signals are used, the
word being received. When an entire word is shifted in on the primary A
channel, the data is (optionally) expanded (SPORT1, 3, 5 and 7 only),
then automatically transferred to the
is shifted in on the secondary channel, it is automatically transferred to the
buffer.
RXSPxB
When the SPORT is configured as a receiver (
buffers, and the channel receive shift registers respond to
RXSPxB
and
SPORTx_CLK
buffer registers and transmit A and B shift registers are inactive and
TXSPxB
do not respond to the
buffers are inactive, writing to a transmit data buffer causes the
TXSPxB
core to hang indefinitely.
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
or
SPORTx_DB
to transmit data. The receive
SPORTx_FS
and
SPORTx_FS
signal indicates the beginning of the serial
SPORTx_FS
for reception of data. The transmit
SPORTx_FS
and
SPORTx_CLK
signal is always driven if the serial
or
SPEN_A SPEN_B
SPTRAN
signals. Since these registers are
SPTRAN
SPORTx_DA
receive clock. If framing
SPORTx_CLK
buffer. When an entire word
RXSPxA
= 0), the
SPTRAN
. Since the
SPORTx_FS
Serial Ports
= 1 in the
SPCTLx
= 1), the
TXSPxA
and
RXSPxA
= 1), the trans-
= 0), the
SPTRAN
or
and
RXSPxA
and
TXSPxA
and
TXSPxA
10-15