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Z80 Datasheet(PDF) 63 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 63 Page - Zilog, Inc. |
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63 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access read and write cycles can be programmed for different timing requirements. If multiple channels are needed, multiple Z80 DMAs can be easily inte- grated. The interrupt structure is fast and versatile. Interrupt signals and vectors can be generated under several conditions. Finally, the Z80 DMA passes data through itself and can therefore compare bytes against a bit- maskable match byte. An overview of Z80 DMA features are listed below and each point is described more thoroughly in this and other chapters. Throughout the remainder of this manual the Z80 DMA is referred to as the DMA. This DMA is available as either the 2.4 MHz Z80 DMA or the 4 MHz Z80A DMA. Both parts have the same features and differ only in speed. Programming The Z80 DMA has 21 writeable 8-bit control registers and 7 readable 8-bit status registers available to the CPU. Control bytes can be written to the DMA or status bytes can be read from the DMA whenever the DMA is not controlling the bus. Control bytes writeable to the DMA include those that effect immediate command actions such as enable, disable, reset, load starting addresses, continue transferring or searching, clear byte and address counters, clear status bits, and more. In addition, many mode-setting control bytes can be written, including the class and mode of operation, port configuration, starting addresses, block length, address-counting rule, match and match- mask bytes, interrupt conditions, interrupt vector, end-of-block rule, Ready- line and Wait-line rules, and others. Readable status registers include a general status byte that reflects Ready- line, end-of-block, byte-match, and interrupt conditions, as well as registers for the current byte count and port addresses. There is a full chapter on programming on page 90 that explains these functions in detail, and most of them are described in general terms on the pages that follow. |
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