Renesas SH7781 - Manual (Page 1355)

26. Serial Sound Interface (SSI) Module
Rev.1.00 Jan. 10, 2008 Page 1325 of 1658
REJ09B0261-0100
The word select pin in this mode does not act as a system word start signal as in non-compressed
mode, but instead is used to indicate that the receiver can receive another data burst, or the
transmitter can transmit another data burst.
Figures 26.18 and 26.19 show the compressed mode data transfer, with burst mode disabled, and
enabled, respectively.
TRMD = 1, CPEN = 1, SCKD = 1, SWSD = 1, SWSP = 0, BREN = 0
Data word 1 Data word 2 Data word 3 Null data
MSB LSB MSB LSB MSB LSB
SSI_SCK
SSI_WS
SSI_SDATA
Figure 26.18 Compressed Data Format, Master Transmitter, Burst Mode Disabled
TRMD = 1, CPEN = 1, SCKD = 1, SWSD = 1, SWSP = 0, BREN = 1
Data word 1 Data word 2 Data word 3 Null data
MSB LSB MSB LSB MSB LSB
SSI_SCK
SSI_WS
SSI_SDATA
Figure 26.19 Compressed Data Format, Master Transmitter, and Burst Mode Enabled