Cirrus Logic CS4970x4 - Manual (Page 110)

7-17 Copyright 2013 Cirrus Logic, Inc. DS810UM6
OS Firmware Module
CS4953x4/CS4970x4 System Designer’s Guide
A. Variable is valid in DSPA OS
B. Variable is valid in DSPB OS
7.6.3 Other DSP Audio Manager Registers
The other registers of the DSP Audio Manager module API are controlled automatically by the DSP
Manager based on configuration modes determined at design time and built into the Flash image.
§§
Table 7-7. OS Module Variables
Index Variable A B Description
0x0008
PCM_AUTODETECT_
SILENCE_THRESHOLD
X
Bit [31:0]: Number of samples (Left+Right) of silence upon which
the DSP will declare Silence while having detected and currently
playing PCM (Autodetect is enabled).
Note: Valid for all decoders when configured for PCM pass-
through and auto switch. It is recommended that system designers
set this value large enough to avoid inter-track silence from PCM
Compact Discs. This is a value that should be set to non-zero if
the input source is a CD, but set to zero at all other times in order
to prevent audio popping noise.
Default*: 0x00017700 †
(The default allows for 1sec of inter-track silence at 48KHz)