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Z80 Datasheet(PDF) 67 Page - Zilog, Inc. |
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Z80 Datasheet(HTML) 67 Page - Zilog, Inc. |
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67 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 19. Basic Functions of the Z80 DMA Modes of Operation Within any class of operation, the Z80 DMA can be programmed to operate in one of three Transfer and/or, Search modes: Byte Mode Data operations are performed one byte at a time. Between each byte oper- ation the system bus is released to the CPU. The bus is requested again for each succeeding byte operation. This is also sometimes called Single mode or byte-at-a-time mode. Burst Mode Data operations continue until a port’s Ready line to the DMA goes inactive. The DMA then stops (releases the system bus) after completing its current byte operation. This is also called demand mode. Continuous Mode Data operations continue until the end of the programmed block of data or a stop-on-match condition is reached before the system bus is released. If a DMA I/O I/O 1. Transfer Memory-to-I/O (optional search) 2. Transfer I/O-to-Memory (optional search) 3. Transfer Memory-to-Memory (optional search) 4. Transfer I/O-to-I/O (optional search) 5. Search Memory 6. Search I/O Memory 1 2 3 5 4 6 |
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