Cirrus Logic CS4970x4 - Manual (Page 99)

7-6 Copyright 2013 Cirrus Logic, Inc. DS810UM6
CS4953x4/CS4970x4 DSP Manager API Description
CS4953x4/CS4970x4 System Designer’s Guide
7.4 CS4953x4/CS4970x4 DSP Manager API Description
The DSP Manager module is the firmware module that is responsible for much of the host
communication, performing auto-switching, flash updates, and responding to host-initiated configuration
changes. The DSP Manager API allows the host to:
• Directly control the current firmware configuration,
• to find out what the current configuration is
• Control what hardware is used for the audio source
• Control common runtime parameters such as gain, trim, and bass management speaker
configuration
• Initiate field flash updates from audio stream
• Read/write an area of flash reserved for host use
7.4.1 Microcontroller Interface (API)
Write Command = 0xEF0nHHHH 0xhhhhhhhh
OR Command = 0xEF40HHHH 0xhhhhhhhh
AC3
Bits 31:30 = DSUREXMOD variable value
Bits 29:28 = DHEADPHONMOD variable value
Bit 27 = ADCONVTYP variable value
Bit 24 = LFEON variable value
Bits 20:16 = DIALNORM variable value
Bits 15:13 = BSMOD variable value
Bits 12:8 = BSID variable value
Bits 5:4 = DSURMOD variable value
Bits 2:0 = ACMOD variable value
DTS
Bits 31:28 = Reserved
Bits 27:24 = LFF variable value
Bits 23:20 = PCMR variable value
Bits 15:12 = EXT_Audio ID
Bits 11:8 = EXT_Audio
Bits 7:0 = AMODE variable value
AAC
Bits 31:25 = Reserved
Bits 24 = LFE Element
Bits 23:4 = Reserved
Bits 3:0 = Channel Configuration
DDPLUS
See the AN304DA application note, “Dolby ® Digital Plus Decoder
Module.”
DTS-HD-HRA
See the AN304DB application note, “DTS-HD ™ High Resolution
Audio Decoder Module.”
DTS-HD-MA
See the AN304DD application note, “DTS-HD™ Master Audio
Decoder Module.”
DTS-HD-LBR
See the AN304DE application note, “DTS Express ™ / DTS-HD ™
Low Bit Rate Secondary Audio Decoder Module“
TRUEHD
See the AN304DC application note, “Dolby ® TrueHD Decoder
Module.”
Table 7-2. DSP_LAST_ACCN_MSG Messages
Decoder Type Description