Cirrus Logic CS4970x4 - Manual (Page 157)

C-4 Copyright 2013 Cirrus Logic, Inc. DS810UM6
Introduction
CS4953x4/CS4970x4 System Designer’s Guide
Note: When the downmix option is chosen (also reflected in the output mode), the program chosen
from the input stream changes to the one with lower number of channels and the CHANNEL
ASSIGNMENT field in the ACCN message reflects this change. The FORMAT INFO field of
the ACCN message still displays all the available programs in the stream.
C.1.6.2 Setting DRC Modes for Dolby TrueHD
The host commands necessary to set DRC modes for Dolby TrueHD are:
UCMD Ef00000000000100
UCMD Ef000007000x00yy
UCMD Ef00000000000001
x = TrueHD DRC mode desired (as per flash_image.xml file), yy= TrueHD uld id
C.1.7 Dolby ProLogic
®
IIx
See the Cirrus Logic application note, AN246MPM for a complete description of the Dolby ProLogic IIx
firmware module.
C.1.7.1 Loading Dolby ProLogic IIx
The host commands necessary to load the Dolby ProLogic IIx legacy mode (pl2x_A) are
UCMD Ef00000000000100
UCMD Ef000008000x00yy
UCMD Ef00000000000001
x = PL2x_A mode, yy = PL2x_A uld id as per flash.h
Pl2x_A can have a mode with crossbar dual zone mixer enabled. This is done by adding the crossbar
configuration. along with PL2x_A configuration for a particular mode of PL2x_A
C.1.7.2 Using Dolby ProLogic IIx to Output HD Audio Streams
The host commands necessary to load Dolby ProLogic II x (pl2x_b) are:
UCMD Ef00000000000100
UCMD Ef000009000x00yy
UCMD Ef00000b0000000z
UCMD Ef00000000000001
x = PL2x_B mode, yy = PL2x_B uld id as per flash.h
z = ppm mode corresponding to desired output mode
In the flash_image.xml file if the first listed module id in the “ppm_modes” section is 0x01 (OS), and the
ppm mode corresponding to output mode =0x09 is z= 0xa, then
To enable 7.1 output from a 5.1 HD audio stream input using PL2x_b , output mode should be set as
below.
UCMD Ef00000000000100
UCMD Ef00000b0000000a
UCMD Ef00000000000001