SH7785 Datasheet, PDF (757/1692 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

14. Direct Memory Access Controller (DMAC)
CLKOUT
Bus cycle
DREQ
(Overrun 0, High level)
DRAK (High-active)
DACK (High-active)
CPU
1st acceptance
DMAC
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the first falling edge of the divided-up DACK
CLKOUT
Bus cycle
DREQ
(Overrun 1, High level)
DRAK (High-active)
DACK (High-active)
CPU
1st acceptance
DMAC
2nd acceptance
: Non-sensitive period
Acceptance started
Accepted after one cycle of CLKOUT
at the first rising edge of the divided-up DACK
Figure 14.21 Example 2 of DREQ Input Detection in Burst Mode Level Detection (Word
Transfer in 8-Bit Bus Width, Longword Transfer in 8/16-Bit Bus Width, 16/32-Byte
Transfer in 8/16/32/64-Bit Bus Width: DACK of DMA1 Transfer Divided)
Rev.1.00 Jan. 10, 2008 Page 727 of 1658
REJ09B0261-0100