Analog Devices SHARC ADSP-21368 - Packed I2 S Mode

ADSP-21368 SHARC Processor Hardware Reference 5-33
Serial Ports
Packed I
2
S Mode
A packed I
2
S mode is available in ADSP-21367/8/9 SHARC processor
serial ports. This mode allows applications to send more than the standard
32 bits per channel available through standard I
2
S mode. Packed I
2
S
mode is implemented using standard TDM mode (and is therefore pro-
grammed similarly to TDM mode). Packed I
2
S mode also supports the
maximum of 128 channels as does TDM mode as well as the maximum of
(128 x 32) bits per left or right channel.
As shown in Figure 5-6, packed I
2
S waveforms are the same as the wave
forms used in TDM mode, except that the frame sync is toggled for every
frame, and therefore emulates I
2
S mode.
Figure 5-6. Packed I
2
S Mode Operation
Data
Frame
Sync
WORD 1WORD 0WORD 1WORD 0
CLK