TMPR4937 datasheet(412/552 Pages) TOSHIBA

Part #	TMPR4937

Description	64-Bit TX System RISC TX49 Family

PDF	552 Pages

Scroll/Zoom	100%

Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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412 / 552 page

Chapter 14 AC-link Controller

14-6

(*) Register settings such as gain can be made during data recording

Figure 14.3.4 Audio Recording Process Flow

Start up AC-link

Enable ENLINK

Check AC’97 status

Clear DMA buffer

Configure DMAC

Start DMA Channel and

enable receive-data DMA

Deassert ACRESET*

CODECRDY Interrupt

Start BITCLK

Set CODEC Ready

ADC Ready response

Set gain, etc.

Start receiving data from slot

Start receive-data DMA

DMAC generates Transfer

Completion interrupt (repeatedly)

Read from DMA buffer and update

DMA descriptor (repeatedly)

Stop updating DMA descriptor

DMAC channel goes inactive

DMA overrun error occurs

Receive-data DMA halts

Check completion status

Disable receive-data DMA

Dummy read from data register to

clear pending DMA request if any

Disable ENLINK

Assert ACRESET *

Stop BITCLK

Stop AC-link

Send sample data

System Software

ACLC and DMAC

AC’97

Start recording audio

TMPR4937 Datasheet(PDF) 412 Page - Toshiba Semiconductor