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Z80 Datasheet(PDF) 184 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 184 Page - Zilog, Inc. |
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184 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 72. RDY Line in Continuous Mode Variable Cycle and Edge Timing The Z80 DMA’s operation-cycle length, without Wait states for the source (read) port and destination (write) port, can be independently programmed. This variable-cycle feature allows read or write cycles consisting of two, three, or four clock cycles, more if Wait cycles are inserted, increasing or decreasing the pulse widths of all signals generated by the DMA. In addi- tion, the trailing edges of the IORQ,MREQ,RD,and WR signals can be independently terminated one-half cycle early. See Figure 73 . A15–A0 D7–D0 RD MREQ BUSREQ BAI RDY |
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