CS4231A Datasheet, PDF (60/76 Pages) List of Unclassifed Manufacturers – PARALLEL INTERFACE MULTIMEDIA AUDIO CODEC

CDB4231/4248
The second four addresses are used by the
codec. The default for the evaluation board and
the software is 530h - no jumpers. The following
table lists the available base addresses (along
with the associated codec address), with a "1"
defined as no shorting jumper and a "0" defined
as a shorting jumper installed:
X1 X0
11
10
01
00
Base
Address
530h
604h
E80h
F40h
Codec
Address
534h
608h
E84h
F44h
(default)
INTERRUPT
Although the hardware supports a wide selection
of interrupts, software may have limitations in
the available options. See the SOFTWARE COM-
PATIBILITY section for more information.
The interrupt is set using header J2, also labeled
INT, (Figure 7) and must also match the software
selected interrupt. The default for the evaluation
board and the software is 7.
DMA SELECTION
Although the hardware supports a wide selection
of DMA channels for playback and capture, soft-
ware may have limitations in the available
options. See the SOFTWARE COMPATIBILITY
section for more information.
The CDB4231 contains two headers for DMA
selection: one determines the playback channel
and the other, if used, determines the capture
channel for full duplex operation. Two shorting
jumpers are needed for the selected DMA chan-
nel, one for the DRQ and one for the DACK.
Header J20, labeled DMA PLAY, (Figure 7) is the
primary DMA channel used for both playback
and capture on the CS4248 or CS4231 in SDC
60
mode, as well as playback on the CS4231 in
full-duplex operation.
Half Duplex - Single DMA Channel
The default configuration for the CDB4231 is
full duplex. When the evaluation board is config-
ured for half duplex, both jumpers on the DMA
CAPTURE header J1, (Figure 7) SHOULD BE
REMOVED. Otherwise, contention with other
system resources may occur.
The CS4248 does not contain the second set of
DMA base registers; therefore, it must be oper-
ated in half duplex mode. Since only one DMA
channel is needed at any particular time, the
CS4248 is usually operated in Single DMA
Channel, SDC, mode.
If only one DMA channel is available, the
CS4231 can be programmed for SDC mode
wherein the playback channel, selected on the
DMA PLAY header is used for both playback and
capture. The default setting for the evaluation
board for the DMA PLAY header DRQ3/DACK3.
Full Duplex - Two DMA Channels
Full duplex is only supported on the CS4231
(MODE 2 operation) which contains independent
capture and playback DMA Base registers.
The J1 header, labeled DMA CAPTURE, (Fig-
ure 7) is used to support simultaneous capture in
the CS4231 full-duplex mode. The default for
the CDB4231 evaluation board DMA CAPTURE
header, J1, is DRQ0/DACK0.
To support full-duplex operation, a unique DMA
channel from each header must be selected.
DS111DB7