HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 508

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 10
Rev. 3.00 Jan. 18, 2008 Page 446 of 1458
REJ09B0033-0300
Figure 10.17
Figure 10.16
Direct Memory Access Controller (DMAC)
CKIO
Bus cycle
DREQ
DACK
TEND
CKIO
DACK
(High-active)
CKIO
DACK
(High-active)
Bus cycle
Bus cycle
DREQ
(Overrun 0,
high-level)
DREQ
(Overrun 1,
high-level)
Example of DMA Transfer End in Cycle Steal Mode Level Detection
Example of DREQ Input Detection in Burst Mode Level Detection
1st acceptance
1st acceptance
DMAC
CPU
CPU
Non-sensitive period
Non-sensitive period
CPU
CPU
CPU
Last DMA transfer
Acceptance
started
2nd acceptance
DMAC
DMAC
DMAC
2nd acceptance
CPU
Acceptance
started
Acceptance
started
3rd acceptance
DMAC
CPU