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SH7721 Datasheet(PDF) 507 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 507 Page - Renesas Technology Corp

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Section 10
Direct Memory Access Controller (DMAC)
Rev. 3.00 Jan. 18, 2008 Page 445 of 1458
REJ09B0033-0300
CKIO
Bus cycle
DREQ
(Overrun 0,
high-level)
Bus cycle
DREQ
(Overrun 1,
high-level)
DACK
(High-active)
CPU
CPU
CPU
DMAC
CKIO
DACKn
(High-active)
CPU
CPU
CPU
DMAC
Non-sensitive period
Non-sensitive period
Non-sensitive period
1st acceptance
2nd acceptance
1st acceptance
2nd acceptance
Acceptance started
Acceptance started
Figure 10.14
Example of DREQ Input Detection in Cycle Steal Mode Level Detection
CKIO
DREQ
(Rising edge)
DACK
(High-active)
CPU
CPU
DMAC
DMAC
Bus cycle
Non-sensitive period
Burst acceptance
Figure 10.15
Example of DREQ Input Detection in Burst Mode Edge Detection



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