SH7268/SH7269 Group

Transmission/Reception of Renesas SPDIF Interface

6.

Software

6.1

Operation Overview

Figure 6.1 shows the Sequence Diagram of Sample Code. The CPU initializes the RSPDIF and allows DMA transfer of

the audio data, and then the transmission will be started. The reception will also be started at the same time by the pass

back function. The audio data is transferred continuously without software by the DMAC continual function. The user

information and the channel status information are transferred by the software using interrupts. However, the same

value shall be used for the channel status information of the transfer without rewriting by the interrupt.

CPU

DMAC channel 4

(transfer)

RSPDIF channel 0

(transfer)

END

START

DMAC Channel 5

(receive)

Initial setting

Initial setting

RSPDIF channel1

(receive)

Allow transfer of audio data

Write channel status

information and user

information

Allow transmission of

audio data

Transfer of audio

data

SPDIF communication

(pass back)

Transfer of audio data

Read channel status information

Interrupts

Write user information

Read user information

Read user information

Write user information

Figure 6.1 Sequence Diagram of Sample Code

R01AN1188EJ0100 Rev.1.00

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Jul. 27, 2012