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AD1816A

–26–

REV. A

[Base+6]

PIO Data

76543210

PIO Playback/Capture [7:0]

RESET = [0x00]

PIO Playback/

The Programmed I/O (PIO) Data Registers for capture and playback are mapped to the same address. Writes

Capture [7:0]

send data to the Playback Register and reads will receive data from the Capture Register.

Reading this register will increment the capture byte state machine so that the following read will be from the

next appropriate byte in the sample. The exact byte may be determined by reading the PIO Status Register.

Once all relevant bytes have been read, the state machine will stay pointed to the last byte of the sample

until a new sample is received.

Writing data to this register will increment the playback byte tracking state machine so that the following

write will be to the correct byte of the sample. Once all bytes have been written, subsequent byte writes will be

ignored. The state machine is reset when the current sample is transferred.

Note: All writes to the FIFO “MUST” contain 4 bytes of data.

* 1 sample of 16-bit stereo

* 2 samples of 16-bit mono

* 2 samples of 8-bit stereo (Linear PCM,

µ-law PCM, A-Law PCM)

* 4 samples of 8-bit mono (Linear PCM,

µ-law PCM, A-Law PCM)

[Base+7]

Reserved

76543210

Reserved [7:0]

RESET = [0xXX]

[Base+8]

Playback Configuration

76543210

TRD

DAZ

PFMT [1:0]

PC/L

PST

PIO

PEN

RESET = [0x00]

PEN

(RW)

Playback Enable. This bit enables or disables programmed I/O data playback.

Disable

Enable

PIO

(RW)

Programmed Input/Output. This bit determines whether the playback data is transferred via DMA or PIO.

DMA transfers only

PIO transfers only

PST

(RW)

Playback Stereo/Mono select. These bits select stereo or mono formatting for the input audio data

streams. In stereo, the Codec alternates samples between channels to provide left and right channel in-

put. For mono, the Codec captures samples on the left channel stereo.

Mono

Stereo

PC/L

(RW)

Playback Companded/Linear Select. This bit selects between a linear digital representation of the audio signal

or a nonlinear companded format for all output data. The type of linear PCM or the type of companded for-

mat is defined by PFMT [1:0].

Linear PCM

Companded

PFMT [1:0] (RW)

Playback Format. Use these bits to select the playback data format for output data according to Table VI and

Figure 15.

DAZ

(RW)

DAC zero. This bit forces the DAC to zero.

Repeat last sample

Force DAC to ZERO

TRD

(RW)

Transfer Request Disable. This bit enables or disables Codec DMA transfers during a Codec interrupt (indi-

cated by the SS Codec Status register’s INT bit being set [1]). This assumes Codec DMA transfers were en-

abled and the PEN or CEN bits are set.

Transfer Request Enable

Transfer Request Disable

After setting format bits, sample data into the AD1816A must be ordered according to Figure 15, Table VI.

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