ADSP-214xx SHARC Processor Hardware Reference C-3
Audio Frame Formats
SCLK, in which the frame synchronization (FS) pulse indicates the start of
valid data.
Serial mode allows a flexible timing which can be used in unframed mode
or framed mode. In framed mode the user can select between timing for
early and late frame sync. Moreover the word order can be selected as LSB
or MSB first.
I
2
S Mode
The Inter-IC-Sound (I
2
S) bus protocol is a popular 3 wire serial bus stan-
dard that was developed to standardize communication across a wide
range of peripheral devices. Today the I
2
S protocol has become the stan-
dard method of communicating with consumer and professional audio
products.
The I
2
S protocol provides transmission of 2 channel (stereo) Pulse Code
Modulation digital data, where each audio sample is sent MSB first. The
following list shows applications that use this format.
• 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, S/PDIF, IEC958,
CP-340, and CP-1201
• Digital audio signal processors
• Dedicated digital filter chips
• Sample rate converters
Timing diagrams for I
2
S, right-justified and left-justified formats
can be found in the product specific data sheet.
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