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SH7021 Datasheet(PDF) 218 Page - Renesas Technology Corp

Part # SH7021
Description  SuperH??RISC engine
PDF  509 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7021 Datasheet(HTML) 218 Page - Renesas Technology Corp

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RENESAS 201
CK
DREQ
DACK
Bus cycle
T2
Tw
T1
DMAC
T2
Tw
T1
CPU
CPU
CPU
DMAC
CPU
CPU
Note:
When DREQ is negated at the third state of the DMAC cycle, the next DMA transfer will
be executed because the sampling is done at the second state of the DMAC cycle.
Figure 9.17
DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
detection and DACK active low) (Single address mode, bus cycle = 2 states + 1 wait state)
DMAC (R): DMAC read cycle
DMAC (W): DMAC write cycle
CK
DREQ
DACK
Bus cycle
T2
Tw
T1
CPU
CPU
DMAC (R)
CPU
CPU
T2
Tw
T1
CPU
DMAC (W)
Figure 9.18
DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
detection and DACK active low) (Dual address mode, bus cycle = 2 states + 1 wait state)



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