Section 11 Direct Memory Access Controller (DMAC)
Rev. 2.00 Mar 09, 2006 page 510 of 906
REJ09B0292-0200
•
Cycle-Steal Mode Edge Detection—16-Bit Transfer
With 16-byte transfer, the first request signal is the first transfer request, and the second
transfer request is accepted when the next request signal is accepted. The third and fourth
requests are accepted in the same way.
Transfer Width
16-Byte Transfer
DREQn Detection
Method
Edge Detection
Transfer bus mode
Cycle-steal mode
DACKn output timing
Read DACK/write
DACK
Transfer address mode
Dual/single mode
Bus cycle
Basic bus cycle
Clock
Bus cycle
CPU
CPU
DMAC
*
1
DMAC
*
2
DMAC
*
3
DMAC
*
4
DMA
1st
acceptance
2nd
acceptance
DACK
*
1
DACK
*
2
DACK
*
3
DACK
*
4
Blind zone
Note:
*
n is the nth 16-byte transfer.
DACKn
(Active high)
DREQn
(Active high)
Figure 11.37 DREQn Pin Input Detection Timing in Cycle-Steal Mode with Edge Detection
(16-Byte Transfer Setting)
•
Cycle-Steal Mode Level Detection
In level detection mode, too, a request cannot be canceled once accepted.
Transfer Width
Byte/Word/Longword
*
DREQn Detection
Method
Level Detection
Transfer bus mode
Cycle-steal mode
DACKn output timing
Read DACK/write
DACK
Transfer address mode
Dual/single mode
Bus cycle
Basic bus cycle
Note:
*
Do not set a 16-byte unit; operation is not guaranteed if this setting is made.
Содержание SH7616
Страница 10: ...Rev 2 00 Mar 09 2006 page x of xxvi ...
Страница 132: ...Section 2 CPU Rev 2 00 Mar 09 2006 page 106 of 906 REJ09B0292 0200 ...
Страница 568: ...Section 12 16 Bit Free Running Timer FRT Rev 2 00 Mar 09 2006 page 542 of 906 REJ09B0292 0200 ...
Страница 582: ...Section 13 Watchdog Timer WDT Rev 2 00 Mar 09 2006 page 556 of 906 REJ09B0292 0200 ...
Страница 662: ...Section 14 Serial Communication Interface with FIFO SCIF Rev 2 00 Mar 09 2006 page 636 of 906 REJ09B0292 0200 ...
Страница 706: ...Section 16 Serial I O SIO Rev 2 00 Mar 09 2006 page 680 of 906 REJ09B0292 0200 ...
Страница 820: ...Section 19 Pin Function Controller PFC Rev 2 00 Mar 09 2006 page 794 of 906 REJ09B0292 0200 ...
Страница 932: ...Appendix D Package Dimensions Rev 2 00 Mar 09 2006 page 906 of 906 REJ09B0292 0200 ...
Страница 935: ...SH7616 Hardware Manual ...