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Z80 Datasheet(PDF) 80 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 80 Page - Zilog, Inc. |
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80 / 330 page  <%27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access PIN DESCRIPTION The following pin descriptions detail the function of the Z80 DMA external pins as illustrated in Figure 25 through Figure 28. A15-A0 System Address Bus (output, tristate). Addresses generated by the DMA are sent to both source and destination ports, either of which may be main memory or I/O peripherals. Table 10. Events and Actions Event Actions Possible When Event Occurs End-of-Block 1. Release Bus 2. Interrupt CPU 3. Auto Restart Byte Match (Compare) 1. Release Bus 2. Interrupt CPU 3. Continue Pulse-control byte matches lower part of byte counter 1. Generate Pulse READY Inactive 1. Release Bus 2. Suspend (continuous mode only) READY Active 1. Request Bus 2. Interrupt CPU RETI Instruction (return from interrupt instruction from the Z80 CPU) 1. Request Bus |
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