Section 11 Direct Memory Access Controller (DMAC)
Rev. 2.00 Mar 09, 2006 page 508 of 906
REJ09B0292-0200
If the DACKn signal is output a number of times, the first DACKn signal for the input DREQn
signal indicates the request acceptance start timing, and subsequently each clock edge is
sampled.
Clock
DMAC
DMAC
DMAC
DMAC
1st
acceptance
2nd
acceptance
3rd
acceptance
CPU
CPU
CPU
CPU
DACKn
(Active high)
Bus cycle
DREQn
(Rising-edge
detection)
Figure 11.33 DREQn/DACKn Handshaking
Transfer Width
Byte/Word/Longword
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
DREQn
(Active high)
DACKn
(Active high)
Requests acceptable
2nd
acceptance
1st
acceptance
CPU
CPU
DMAC
CPU
Blind zone
Figure 11.34 DREQn Pin Input Detection Timing in Cycle-Steal Mode with Edge Detection
Содержание SH7616
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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 ...