HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 491

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

Figure 13.14 Example of DREQ Input Detection in Cycle Steal Mode Level Detection
Figure 13.13 Example of DREQ Input Detection in Cycle Steal Mode Edge Detection
Figure 13.15 Example of DREQ Input Detection in Burst Mode Edge Detection
CKIO
Bus cycle
DREQ
(Rising)
DACK
(Active-high)
CKIO
Bus cycle
DREQ
(Overrun 1 at
high level)
DACK
(Active-high)
CKIO
Bus cycle
DREQ
(Rising)
DACK
(Active-high)
CKIO
Bus cycle
DREQ
DACK
Burst acceptance
1st acceptance
1st acceptance
1st acceptance
CPU
CPU
CPU
Non sensitive period
CPU
Non sensitive period
Non sensitive period
CPU
Non sensitive period
CPU
CPU
CPU
Section 13 Direct Memory Access Controller (DMAC)
2nd acceptance
DMAC
DMAC
Acceptance
start
DMAC
DMAC
Acceptance start
Rev. 4.00 Sep. 14, 2005 Page 441 of 982
2nd acceptance
2nd acceptance
Acceptance
start
CPU
CPU
CPU
DMAC
REJ09B0023-0400