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SH7021 Datasheet(PDF) 216 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 216 Page - Renesas Technology Corp |
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216 / 509 page  RENESAS 199 Figure 9.13 to 9.22 show the sampling timing of the pin DREQ in the cycle steal mode for each bus cycle. When no DREQ input is detected at the sampling after the aforementioned DREQ detection, the next sampling occurs in the next stage in which a DACK signal is output. If no DREQ input is detected at this time, sampling occurs at every state thereafter. CK DREQ DACK Bus cycle CPU CPU CPU DMAC CPU CPU CPU CPU Figure 9.13 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level detection and DACK active low) (Single address mode, bus cycle = 1 state) CK DREQ DACK Bus cycle CPU CPU CPU DMAC (R) DMAC (W) CPU CPU CPU DMAC (R): DMAC read cycle DMAC (W): DMAC write cycle Note: Illustrates the case when DACK is output during the DMAC Read cycle. Figure 9.14 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level detection and DACK active low) (Dual address mode, bus cycle = 1 state) |
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