SH7763 Datasheet, PDF (1508/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 34 Serial Sound Interface (SSI)
In the case of the SSI module configured as a transmitter then each word that is written to SSITDR
is transmitted in order on the serial audio bus.
In the case of the SSI module configured as a receiver each word received on the Serial Audio Bus
is presented for reading in order by SSIRDR.
Figures 34.6 to 34.8 show how 2, 3 and 4 channels are transferred on the serial audio bus.
Figures 34.6 to 34.8 show how data on multiple channels (2, 3 or 4 channels) is transferred on the
serial audio bus. Figure 34.6 shows the data transfer using no padding bits. Figure 34.7 shows the
data transfer in which data is left-aligned with padding bits. Figure 34.8 shows the data transfer in
which data is right-aligned with padding bits. This selection is purely arbitrary.
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 01, SPDP = don't care, SDTA = don't care
System word length = data word length × 2
SSI_SCK
SSI_WS
SSI_SDATA
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
Data
word 1
Data
word 2
Data
word 3
Data
word 4
Data
word 1
Data
word 2
Data
word 3
Data
word 4
System word 1
System word 2
System word 1
System word 2
Figure 34.6 Multichannel Format (2 Channels, No Padding)
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 10, SPDP = 1, SDTA = 0
System word length = data word length × 3
SSI_SCK
SSI_WS
SSI_SDATA
MSB
LSB MSB
LSB MSB
LSB
MSB
LSB MSB
LSB MSB
LSB
MSB
Data
word 1
Data
word 2
Data
word 3
Data
word 4
Data
word 5
Data
word 6
System word 1
System word 2
Figure 34.7 Multichannel Format (3 Channels with High Padding)
Rev. 1.00 Oct. 01, 2007 Page 1442 of 1956
REJ09B0256-0100