SPORT Operation Modes
5-20 ADSP-21368 SHARC Processor Hardware Reference
I
2
S Mode
I
2
S mode is a three-wire serial bus standard protocol for transmission of
two-channel (stereo) pulse code modulation (PCM) digital audio data,
where each sample is transmitted in MSB-first format. Many of today’s
analog and digital audio front-end devices support the I
2
S protocol
including:
• Audio D/A and A/D converters
• PC multimedia audio controllers
• Digital audio transmitters and receivers that support serial digital
audio transmission standards, such as AES/EBU, SP/DIF, IEC958,
CP-340, and CP-1201
• Digital audio signal processors
• Dedicated digital filter chips
• Sample rate converters
Figure 5-3. Word Select Timing in Left-Justified Sample Pair Mode
1
1 This figure illustrates only one possible combination of settings attainable in the left-justified sample
pair mode. In this example case, OPMODE =1, LAFS =1, and FRFS =1. For additional combinations,
refer to Table 5-1 on page 5-11.
SPORTX_CLK
SPORTx_FS/WS
LEFT-JUSTIFIED SAMPLE
PAIR MODE DATA OR
SPORTX_DA O R SPORTX_DB
MSB
n
SAMPLE n SAMP LE n+1
LSB
n
MSB
n+1
SAMPLE n-1
LS B
n- 1
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