Analog Devices ADSP-21261 SHARC Hardware Reference Manual page 409


This bit applies to Multichannel mode only.
Data Buffer Status Channel A (read-only).
bits 31–30 (
RXS_A
buffer contents as follows: 00 = buffer empty, 01 = reserved, 10 = buffer
partially full, 11 = buffer full.
DXS Data Buffer Status.
( ). These read-only bits indicate the status of the serial port's data
DXS_B
buffer as follows: 11 = buffer full, 00 = buffer empty, 10 = buffer partially
full, 01 = reserved.
The or
DXS_A DXS_B
TXSPxB/RXSPxB
test for space in
to zero for the A channel, or whether
B channel. To test for the presence of any data in
test whether
DXS_A
(bit 28) is equal to one for the B channel.
DXS_B
This description applies to I
dard Serial modes.

When the SPORT is configured as a transmitter, these bits reflect
transmit buffer status for the
SPORT is configured as a receiver, these bits reflect receive buffer
status for the
Transmit Data Buffer Status (read-only).
30 and 31(
TXS_A
nel's transmit buffer as follows: 11 = buffer full, 00 = buffer empty,
10 = buffer partially full.
ADSP-2126x SHARC Processor Hardware Reference
). These bits indicate the status of the channel's receive
Bits 31–30 (
SPCTLx
Status bits indicate whether the
buffer is full (11), empty (00), or partially full (10). To
or
TXSPxA/B RXSPxA/B
(bit 31) is equal to one for the A channel, or whether
2
S, Left-justified Sample Pair, and DSP Stan-
and
RXSPxA RXSPxB
). These bits indicate the status of the serial port chan-
,
SPCTL1 SPCTL3
) and bits 28-27
DXS_A
TXSPxA/RXSPxA
, test whether
DXS_A
(bit 27) is equal to zero for the
DXS_B
TXSPxA/B
and
TXSPxA TXSPxB
buffers.
,
SPCTL0 SPCTL2
Serial Ports
and
SPCTL5
or
(bit 30) is equal
or ,
RXSPxA/B
buffers. When the
and Bits
SPCTL4
9-59