Cirrus Logic CS4970x4 - Manual (Page 98)

Firmware Messaging
CS4953x4/CS4970x4 System Designer’s Guide
DS810UM6 Copyright 2013 Cirrus Logic, Inc 7-5
7.3.8 DSP_LAST_ACCN_MSG
The DSP_LAST_ACCN_MSG will be updated every time a stream variable changes. The meaning of this
register will depend on the value of the DSP_AUTODETECT_MSG. The valid DSP_LAST_ACCN_MSG
are listed in
Table 7-2 .
Table 7-1. DSP_AUTODETECT_MSG Messages
Bit Number Description
Bit 31 Decodable_Stream_Flag = 0/1 = This stream is not/is decode-able by the application.
Bits [15:0]
Bit 5 Non_IEC61937_Stream_Flag= 1/0 = This stream is not/is IEC61937 compressed data.
If Non_IEC61937_Stream_Flag=1
Non_IEC61937 Stream Descriptor.
0x0020 = Silent Input Data (Out of Application Sync)
0x0021 = DTS Format-16 elementary stream
0x0022 = DTS Format-14 elementary stream
0x0023 = Linear 2.1 channel PCM stream
0x0623 = Linear 5.1 channel PCM stream
0x0823 = Linear 7.1 channel PCM stream
0x0024 = HDCD PCM Sync Detect (only available in HDCD application).
0x0025 = HDCD PCM Sync Lost (only available in HDCD application).
If Non_IEC61937_Stream_Flag=0
IEC61937 Stream Descriptor:
Data type descriptor in IEC61937 specification. Description of the
Data-type field of Pc reproduced below from IEC61937 Specification
0x0000 = Never Reported.
0x0001 = AC-3 data.
0x0003 = Never Reported.
0x0004 = MPEG-1 Layer 1 data.
0x0005 = MPEG-1 Layer 2 or 3 data or MPEG-2 without extension.
0x0006 = MPEG-2 data with extension.
0x0007 = MPEG-2 AAC ADTS data.
0x0008 = MPEG-2 Layer 1 Low sampling frequency.
0x0009 = MPEG-2 Layer 2 or 3 Low sampling frequency.
0x000B = DTS-1 data (512-sample bursts).
0x000C = DTS-2 data (1024-sample bursts).
0x000D = DTS-3 data (2048-sample bursts).
0x000E–0x0010 = Reserved.
0x001C = MPEG-2 AAC ADTS data
0x0011 and 0x0211 = DTS-HD High-Resolution Audio (HRA)
0x0015 = Dolby Digital Plus
0x0016 = TrueHD
0x0311 = DTS-HD Low Bit Rate Audio
0x0411 and 0x0C11 = DTS-HD Master Audio, 48 KHz Fs
0x4211 = DTS-HD High Resolution Audio (HRA), 96 KHz Fs
0x4411 and 0x4C11 = DTS-HD Master Audio, 96 KHz Fs
0xC411 and 0xCC11 = DTS HD Master Audio, 192 kHz Fs multi-channel (non-stereo), output at 96
KHz per DTS specification.
Table 7-2. DSP_LAST_ACCN_MSG Messages
Decoder Type Description
PCM Bits 31:0 = Reserved
HDCD Bits 31:0 = Reserved
SGEN Bits 31:0 = Reserved
LOGIC7 Bits 31:0 = Reserved