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CS497004-CQZ 数据表(PDF) 7 Page - Cirrus Logic |
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CS497004-CQZ 数据表(HTML) 7 Page - Cirrus Logic |
7 / 34 page DS752PP8 Copyright 2009 Cirrus Logic 7 CS4970x4 Data Sheet 32-bit High Definition Audio Decoder DSP Family 4. Hardware Functional Description 4.1 Coyote DSP Core The CS4970x4 is a dual-core Coyote DSP with separate X and Y data and P code memory spaces. Each core is a high-performance, 32-bit, user-programmable, fixed-point DSP that is capable of performing two multiply accumulate (MAC) operations per clock cycle. Each core has eight 72-bit accumulators, four X- and four Y-data registers, and 12 index registers. Both DSP cores are coupled to a flexible DMA engine. The DMA engine can move data between peripherals such as the digital audio input (DAI) and digital audio output (DAO), external memory, or any DSP core memory, all without the intervention of the DSP. The DMA engine offloads data move instructions from the DSP core, leaving more MIPS available for signal processing instructions. CS4970x4 functionality is controlled by application codes that are stored in on-board ROM or downloaded to the CS4970x4 from a host MCU or external FLASH/EEPROM. Users can choose to use standard audio decoder and post-processor modules which are available from Cirrus Logic. The CS4970x4 is suitable for Audio Decoder, Audio Post-processor, Audio Encoder, DVD Audio/Video Player, and Digital Broadcast Decoder applications. 4.1.1 DSP Memory Each DSP core has its own on-chip data and program RAM and ROM and does not require external memory for any of today’s popular audio algorithms including Dolby Digital Surround EX, AAC Multichannel, DTS-ES 96/24, and THX Ultra2. However, if the end-system design requires support of the new high-definition audio formats, external SDRAM will be needed to support Dolby TrueHD and DTS-HD Master Audio. The memory maps for the DSPs are as follows. All memory sizes are composed of 32-bit words. 4.1.2 DMA Controller The powerful 12-channel DMA controller can move data between 8 on-chip resources. Each resource has its own arbiter: X, Y, and P RAM/ROMs on DSP A; X, Y, and P RAM/ROMs on DSP B; external memory; and the peripheral bus. Modulo and linear addressing modes are supported, with flexible start address and increment controls. The service interval for each DMA channel as well as up to 6 interrupt events, is programmable. 4.2 On-chip DSP Peripherals 4.2.1 Digital Audio Input Port (DAI) The 12-channel (6 line) DAI port supports a wide variety of data input formats. The port is capable of accepting PCM, IEC61937, or DSD. Up to 32-bit word lengths are supported. Up to 6 channels of DSD are supported and internally converted to PCM before processing. Additionally support is provided for audio data input to the DSP via the DAI from an HDMI receiver. Table 3. CS4970x4 DSP Memory Sizes Memory Type DSP A DSP B X 16k SRAM, 32k ROM 10k SRAM, 8k ROM Y 24k SRAM, 32k ROM 16k SRAM, 16k ROM P 8k SRAM, 32k ROM 8k SRAM, 24k ROM |
类似零件编号 - CS497004-CQZ |
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类似说明 - CS497004-CQZ |
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