Renesas SH7211 - Manual (Page 5)

SH7211 Group
Data Transfer between On-chip RAM Areas with DMAC (Cycle-Stealing Mode)
REJ06B0732-0100/Rev.1.00 March 2008 Page 5 of 13
DMATCR_n
SAR_n
CHCR_n
DAR_n
DMAOR
DMARS0 to DMARS3
HEIn
DACK0 to DACK3,
TEND0, TEND1
DEIn
RDMATCR_n
RSAR_n
RDAR_n
On-chip
memory
On-chip
peripheral
module
DMA transfer
request signal
DMA transfer acknowledge signal
Interrupt controller
External ROM
External RAM
External device
(memory mapped)
External device
(with acknowledge)
DREQ0 to DREQ3
Peripheral bus
Internal bus
DMAC module
Iteration
control
Register
control
Start-up
control
Request
priority
control
Bus
interface
Bus state
controller
[Legend]
RDMATCR: DMA reload transfer count register
CHCR: DMA channel control register
DMATCR: DMA transfer count register DMAOR: DMA operation register
RSAR: DMA reload source address register DMARS0 to DMARS3: DMA extension resource selectors 0 to 3
SAR: DMA source address register HEIn: DMA transfer half-end interrupt request to the CPU
RDAR: DMA reload destination address register DEIn: DMA transfer end interrupt request to the CPU
DAR: DMA destination address register n: 0, 1, 2, 3, 4, 5, 6, 7
Figure 3 Block Diagram of DMAC