Renesas SH7781 - Manual (Page 1359)

26. Serial Sound Interface (SSI) Module
Rev.1.00 Jan. 10, 2008 Page 1329 of 1658
REJ09B0261-0100
(1) Transmission Using DMA Controller
No
Yes
Yes
Start
End*
Release reset,
specify configuration bits
in SSICR
Setup DMA controller to provide data
as required for transmission
Wait for interrupt from DMAC or SSI
Enable SSI module,
enable DMA,
enable error interrupts
Disable SSI module,
disable DMA
disable error interrupt,
enable Idle interrupt
Note: * When SSI error interrupt occurs (underflow/overflow), back to start
and execute flow again.
EN = 0,
DMEN = 0
UIEN = 0, OIEN = 0,
IIEN = 1
Wait for idle interrupt
from SSI module
SSI
error interrupt?
Has DMAC
Tx data been
completed?
More data to be send?
EN = 1,
DMEN = 1,
UIEN = 1, OIEN = 1
Specify TRMD, EN, SCKD,
SWSD, MUEN, DEL, PDTA,
SDTA, SPDP, SWSP, SCKP,
SWL, DWL, CHNL
Figure 26.21 Transmission Using DMA Controller