LSI Logic Confidential
12-20
Audio Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
12.5.5 Audio Output Length Register
The 32-bit Audio Output Length register, is memory-mapped to the
control bus address 0x050040, that contains the length in bytes for an
audio output stream transfer. This register is initially written by the
SPARC processor as an audio output transfer is being configured. This
register is part of a two-level command queue that is advanced each time
the GoO bit is set by software. Reading or writing the Audio Output
Length register returns or updates the most recent queue entry. The
output length must be a multiple of 64 bytes. The length of audio output
transfers with I958 set must correspond to an even number of IEC958
samples.
12.6 Audio Frame Formats
The DMN-8600 processor supports seven audio frame formats.
lists these formats with the products they support. To select
the format needed by the application, the host must issue the Audio
Configuration command defined in the DMN-8600 Programming
Reference Manual.
The number of samples per frame specifies the number of audio samples
transmitted per frame sync cycle on each audio input and output pin.
Table 12.1
Audio Frame Formats
Format
Product Compatibility
Sample
Justification
Sample
Sizes (bits)
FRFORM 0
DSP chips
Left
16 to 32
FRFORM 1
Crystal 4216 and 4218 Codecs
Left
16
FRFORM 2
Reserved
–
–
FRFORM 3
Crystal ADCs and DACs
Left
16 to 32
FRFORM 4
IDS chips
Left
16 to 32
FRFORM 5
Typical multibit DACs and
interpolation filters
Right
16
FRFORM 6
Right
18
FRFORM 7
Right
20
Содержание DMN-8600
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