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Z80 Datasheet(PDF) 52 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 52 Page - Zilog, Inc. |
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52 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 15. Typical CPU I/O Sequence The Z80 and Z8000 CPUs both have block-transfer and string-search instructions that can operate on up to 64 Kbytes of data with a single instruction. A single block transfer instruction repetitively performs all of the functions illustrated in Figure 15 on an entire sequence of bytes. Therefore, transfer rates are significantly faster. The 4 MHz Z80A CPU can transfer at about 200 Kbytes/sec and the 4 MHz Z8000 CPU can reach 800 Kbytes/sec. The problem with CPU block transfers in the Z80 and Z8000 devices is not transfer speed but response time at startup. One of the following methods is normally used to set up executing a block transfer instruction: Read Source Port Write to Destination Port Increment Address Counter Increment Byte Counter NO YES END Byte Count Equal Block Length ? |
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