r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 756

• 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 726 of 1658
REJ09B0261-0100
Figure 14.20 Example 1 of DREQ Input Detection in Burst Mode Level Detection (Byte
Transfer in 8/16/32/64-Bit Bus Width, Word Transfer in 16/32/64-Bit Bus Width, or
CLKOUT
Bus cycle
DREQ
(Overrun 0, High level)
DRAK (High-active)
DACK (High-active)
CLKOUT
Bus cycle
DREQ
(Overrun 1, High level)
DRAK (High-active)
DACK (High-active)
Longword Transfer in 32/64-Bit Bus Width)
1st acceptance
1st acceptance
: Non-sensitive period
CPU
CPU
DMAC
DMAC
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the rising edge of DACK
2nd acceptance
Acceptance started
Accepted after one cycle of CLKOUT
at the falling edge of DACK