STi5107

Architecture features

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2.9

Audio subsystem

The audio subsystem supports audio decoding of MPEG-1 layers I, II.

Simultaneous MPEG-1 audio decoding and compressed output of Dolby streams on the

S/PDIF is supported.

Audio sample rates of 32 kHz, 44.1 kHz and 48 kHz are supported.

The audio subsystem is illustrated in Figure 9.

Figure 9.

Audio subsystem

The audio subsystem consists of the following units:

●

audio decoder,

●

S/PDIF player, PCM player,

●

integrated 24-bit stereo audio DAC system,

●

audio/digital frequency synthesizer: generates the PCM and sample rate clocks.

2.10

Central DMA controller

The STi5107 has a multichannel, burst-capable direct memory access controller that

supports the following:

●

fast 2D unaligned memory to memory transfers of graphics and stills,

●

real time stream transfers to and from memory with or without pacing. These channels

are suitable for transfers with external peripherals, for audio and video stream transfers

within the STi5107.

FDMA

LMI

Memory

ADAC

Stereo

analog

outputs

System interconnect

CPU

Interrupts

decoder

PCM player

S/PDIF

S/PDIF output

DMA request

DMA request

DMA request

Audio

FS

DMA request

player