SH7261 datasheet(825/1348 Pages) RENESAS

825 / 1348 page

Section 18 Serial Sound Interface (SSI)

Rev. 2.00 Sep. 07, 2007 Page 793 of 1312

REJ09B0320-0200

When the SSI module acts as a transmitter, each word written to SSITDR is transmitted to the

serial audio bus in the order they are written. When the SSI module acts as a receiver, each word

received by the serial audio bus is read in the order received from the SSIRDR register.

Figures 18.7 to 18.9 show how 2, 3 and 4 channels are transferred to the serial audio bus. Note that

there are no padding bits in the first example, the second example is left-aligned and the third is

right-aligned. This selection is arbitrary and is just for demonstration purposes only.

MSB

LSB

Data

word 1

MSB

LSB MSB

LSB

Data

word 2

Data

word 3

Data

word 4

System word 1

System word 2

MSB

LSB

Data

word 1

MSB

LSB MSB

LSB

Data

word 2

Data

word 3

Data

word 4

System word 1

System word 2

LSB

MSB

SSISCK

SSIWS

SSIDATA

SCKP = 0, SWSP = 0, DEL = 1, CHNL = 01, SPDP = don't care, SDTA = don't care

System word length = data word length

× 2

Figure 18.7 Multichannel Format (2 Channels Without Padding)

MSB

LSB

System word 2

Data

word 1

MSB

LSB MSB

LSB

MSB

Data

word 2

Data

word 3

System word 1

MSB

LSB MSB

LSB

Data

word 4

Data

word 5

Data

word 6

SSISCK

SSIWS

SSIDATA

SCKP = 0, SWSP = 0, DEL = 1, CHNL = 10, SPDP = 1, SDTA = 0

System word length = data word length

× 3

Figure 18.8 Multichannel Format (3 Channels with High Padding)

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