Renesas SH7781 - Manual (Page 1346)

26. Serial Sound Interface (SSI) Module
Rev.1.00 Jan. 10, 2008 Page 1316 of 1658
REJ09B0261-0100
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.
System word 1 =
data word 1
System word 2 =
data word 2
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00
System word length = data word length
prev. sample MSB LSB+1 LSB MSB LSB+1 LSB next sample
SSI_SCK
SSI_WS
SSI_SDATA
Figure 26.2 Philips Format (with No Padding)
System word 1 System word 2
Data word 1 Data word 2 Padding Padding
SCKP = 0, SWSP = 0, DEL = 0, CHNL = 00, SPDP = 0, SDTA = 0
System word length > data word length
MSB LSB MSB LSB next
SSI_SCK
SSI_WS
SSI_SDATA
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.