SH7785 Datasheet, PDF (1346/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

26. Serial Sound Interface (SSI) Module
1. Philips Format
Figures 26.2 and 26.3 show the supported Philips protocol both with padding and without.
Padding occurs when the data word length is smaller than the system word length.
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00
System word length = data word length
SSI_SCK
SSI_WS
SSI_SDATA
prev. sample MSB
LSB+1 LSB MSB
LSB+1 LSB
System word 1 =
data word 1
System word 2 =
data word 2
next sample
Figure 26.2 Philips Format (with No Padding)
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00, SPDP = 0, SDTA = 0
System word length > data word length
SSI_SCK
SSI_WS
SSI_SDATA
MSB
LSB
MSB
LSB
next
Data word 1
Padding
System word 1
Data word 2
Padding
System word 2
Figure 26.3 Philips Format (with Padding)
Figure 26.4 shows the format used by Sony. Figure 26.5 shows the format used by Matsushita.
Padding is assumed in both cases, but may not be present in a final implementation if the
system word length equals the data word length.
Rev.1.00 Jan. 10, 2008 Page 1316 of 1658
REJ09B0261-0100