SH7764 Datasheet, PDF (739/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 18 Serial Sound Interface (SSI)
• Matsushita Format
Figure 18.5 shows the format used by Matsushita. Padding is assumed, but may not be present
if the system word length equals the data word length.
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 00, SPDP = 0, SDTA = 1
System word length > data word length
SSISCK
SSIWS
SSIDATA ^Prev.
MSB
LSB
Padding
Data word 1
System word 1
MSB
LSB
Padding
Data word 2
System word 2
Figure 18.5 Matsushita Format (with Padding Bits First, Followed by Serial Data)
(f) Multi-Channel Formats
Some devices extend the definition of the specification by Philips and allow more than 2 channels
to be transferred within two system words.
SSI_CH0 to SSI_CH5 support the transfer of 2, 3 and 4 channels by the use of the CHNL, SWL
and DWL bits. It is important that the system word length (SWL) is greater than or equal to the
number of channels (CHNL) times the data word length (DWL).
Table 18.9 shows the number of padding bits for each of the valid configurations. If a setup is not
valid it does not have a number in the following table and has instead a dash.
Rev. 1.00 Nov. 22, 2007 Page 683 of 1692
REJ09B0360-0100