HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 498

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

Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 448 of 982
REJ09B0023-0400
Figure 13.21 Example of DREQ Input Detection in Cycle Steal Mode Level Detection
Bus cycle
DREQ
(Overrun 0,
high-level)
DACK
(High-active)
Bus cycle
DREQ
(Overrun 1,
high-level)
DACK
(High-active)
CKIO
CKIO
1st acceptance
Non-sensitive period
1st acceptance
Non-sensitive period
CPU
CPU
When DACK is Divided to 4 by Idle Cycles
2nd acceptance
Non-sensitive period
2nd acceptance 3rd acceptance possible
Non-sensitive period
3rd acceptance possible
DMAC write
DMAC write