LSI Logic Confidential
Audio Frame Formats
12-25
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
sample is present when FSYNC is HIGH, and the Right sample is
present when FSYNC is LOW. The FSYNC transition occurs one clock
cycle after the last bit of each 16-bit external sample. The transition of
FSYNC from LOW-to-HIGH and HIGH-to-LOW defines the beginning or
end of each sample.
12.6.7 FRFORM 6
shows the FRFORM 6 audio frame format. In this format, two
18-bit audio samples are transmitted per frame sync (FSYNC) cycle.
FRFORM 6 uses a Left HIGH/Right LOW frame sync–that is, the Left
sample is present when FSYNC is HIGH, and the Right sample is
present when FSYNC is LOW. The FSYNC transition occurs one clock
after the last bit of each 18-bit external sample. The transition of FSYNC
from LOW-to-HIGH and HIGH-to-LOW defines the beginning or end of
each sample.
Figure 12.7 FRFORM 5 Audio Frame Definition (Right Justified)
Figure 12.8 FRFORM 6 Audio Frame Definition (Right Justified)
SCLK
FSYNC
Audio
1 Frame
16 Bits
Left Sample
16 Bits
Right Sample
Data
1 Frame
Left Sample
18 Bits
18 Bits
Right Sample
SCLK
FSYNC
Audio
Data