r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 758

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

14. Direct Memory Access Controller (DMAC)
Rev.1.00 Jan. 10, 2008 Page 728 of 1658
REJ09B0261-0100
Figure 14.22 Example 3 of DREQ Input Detection in Burst Mode Level Detection (Word
Transfer in 8-Bit Bus Width, Longword Transfer in 8/16-Bit Bus Width, or 16/32-Byte
Transfer in 8/16/32/64-Bit Bus Width: DACK of DMA1 Transfer Is Connected)
CLKOUT
Bus cycle
Address
DREQ
(Overrun 0, High level)
DRAK (High-active)
DACK (High-active)
CLKOUT
Bus cycle
Address
DREQ
(Overrun 1, High level)
DRAK (High-active)
DACK (High-active)
1st acceptance
1st acceptance
: Non-sensitive period
CPU
CPU
2nd acceptance
DMAC
DMAC
Acceptance started
Accepted after one cycle of CLKOUT
at the rising edge of DACK
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
after the end of the first of the multiple bus cycles