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SH7021 Datasheet(PDF) 220 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 220 Page - Renesas Technology Corp |
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220 / 509 page  RENESAS 203 CK DREQ DACK Bus cycle T3 T2 T1 T4 CPU CPU CPU DMAC CPU CPU T3 T2 T1 T4 DMAC Note: When DREQ is negated at the fourth 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 9.21 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level detection and DACK active low) (Single address mode, bus cycle = Address/data multiplex I/O bus cycle) CK DREQ DACK Bus cycle T3 T2 T1 T4 CPU DMAC(R) DMAC (R) T3 T2 T1 T4 CPU CPU DMAC (W) CPU DMAC (W) CPU DMAC (R): DMAC read cycle DMAC (W): DMAC write cycle Note: When DREQ is negated at the fourth 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 9.22 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level detection and DACK active low) (Dual address mode, bus cycle = Address/data multiplex I/O bus cycle) |
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