SH7785 Datasheet, PDF (1347/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

26. Serial Sound Interface (SSI) Module
2. Sony Format
SCKP = 0, SWSP = 0, DEL = 1, 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
Data word 2
Padding
System word 1
System word 2
Figure 26.4 Sony Format (with Serial Data First, Followed by Padding Bits)
3. Matsushita Format
SCKP = 0, SWSP = 0, DEL = 1, CHNL = 00, SPDP = 0, SDTA = 1
System word length > data word length
SSI_SCK
SSI_WS
SSI_SDATA prev
MSB
LSB
Padding
Data word 1
System word 1
MSB
LSB
Padding
Data word 2
System word 2
Figure 26.5 Matsushita Format (with Padding Bits First, Followed by Serial Data)
(6) Multi-Channel Formats
There is an extend format of the definition of the specification by Philips and allows more than 2
channels to be transferred within two system words.
The SSI module supports the transfer of 4, 6 and 8 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 26.4 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 Jan. 10, 2008 Page 1317 of 1658
REJ09B0261-0100