LSI Logic Confidential
12-22
Audio Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
12.6.2 FRFORM 1
and
show the FRFORM 1 audio frame format. In
this format, two 16-bit audio samples and two status samples are
transmitted per frame sync (FSYNC) cycle. The frame sync transition
occurs at the first bit of the first sample in the frame.
FRFORM 1 requires input and output samples to be 16 clocks each,
because there is no other timing reference to delineate sample
boundaries. FRFORM 1 transfers four 16-bit words per frame (additional
bits are discarded on input).
FRFORM 1 uses a pulse frame sync (FSYNC) signal. On output, FSYNC
is HIGH for one clock, and then goes LOW until the next frame
(
). On input, the HIGH-to-LOW transition is ignored
FRFORM 1 clocks in the left status information from the AI_D[3:0] pins
to the
and
Registers as shown in
. Note
that the right status information is discarded.
Figure 12.1 Location of FRFORM 1 Status
Figure 12.2 FRFORM 0 Audio Frame Definition
Register
31
16
15
0
Address
Left Status from
AI_D0 Pin
Left Status from
AI_D1 Pin
0x050008
Left Status from
AI_D2 Pin
Left Status from
AI_D3 Pin
0x05000C
SCLK
FSYNC
Audio
Data]
1 Frame
32/64 Bits
32/64 Bits
32/64 Bits
32/64 Bits
Содержание DMN-8600
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