LSI Logic Confidential
12-24
Audio Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
12.6.5 FRFORM 4
shows the FRFORM 4 audio frame format. In this format, two
audio samples are transmitted per frame sync (FSYNC) cycle. FRFORM
4 uses a Left LOW/Right HIGH frame sync–that is, the Left sample is
present when FSYNC is LOW, and the Right sample is present when
FSYNC is HIGH. The FSYNC transition occurs one clock cycle before
the first bit of each sample. The transition of FSYNC from LOW-to-HIGH
and HIGH-to-LOW defines the beginning or end of each sample.
Figure 12.5 FRFORM 3 Audio Frame Definition
Figure 12.6 FRFORM 4 Audio Frame Definition
12.6.6 FRFORM 5
shows the FRFORM 5 audio frame format. In this format, two
16-bit audio samples are transmitted per frame sync (FSYNC) cycle.
FRFORM 5 uses a Left HIGH/Right LOW frame sync–that is, the Left
SCLK
FSYNC
Audio
Data
1 Frame
32/64 Bits
32/64 Bits
Left Sample
Right Sample
SCLK
FSYNC
Audio
Data
1 Frame
32/64 Bits
32/64 Bits
Left Sample
Right Sample