Z80 Datasheet, PDF (153/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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DMA
IORQ RD WR BUSACK
DMA
BAI RD IORQ
HIGH
1 0 1 010 10
OE
SEL
Y1 Y2 Y3 Y4
MRD
MWR
Address and Data Buses
RD WR
MEMORY
Figure 52. Simultaneous Transfer
IOWR
IORD
RD WR CE
I/O
IOCE
I/O
DECODER
UM008101-0601
Direct Memory Access