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Z80 Datasheet(PDF) 157 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 157 Page - Zilog, Inc. |
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157 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 54. Data Bus Buffer Control Example Z80 DMA and Z80 SIO Example A common DMA application is performing data transfers over a serial data link. The Z80 SIO peripheral is used to interface to the link, providing conversion between serial and parallel data formats, synchronization, and other functions. Comparing the efficiency of interrupt driven and DMA data transfers requires examination of the event sequences during the brief time intervals in which the SIO needs a character (byte) transfer. Most of the time the SIO is busy transmitting or receiving message bits and requires no service. The SIO must be programmed to drive its WAIT/RDY line as a RDY signal to the DMA, which is programmed for active-Low RDY in Byte mode. ON.CARD.INT ACK RD DMA.WRITE ON.CARD.READ ON.CARD.ENABLE DIR EN DRIVE.DATA.OUT On-Card Data Bus System Data Bus 47LS 245 RD CARD.IEO CARD.IEI M1 IORQ DMA.CE SIO.CE PIO.CE CTC.CE DMA.HAS.BUS |
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