MOTOROLA M68020 USER’S MANUAL A- 1
APPENDIX A
INTERFACING AN MC68EC020 TO A DMA DEVICE
THAT SUPPORTS A THREE-WIRE BUS ARBITRATION
PROTOCOL
The MC68EC020 supports a two-wire bus arbitration protocol; however, it may become
necessary to interface the MC68EC020 to a device that supports a three-wire arbitration
protocol. Figure A-1 shows a method by which this can be achieved.
Figure A-1. Bus Arbitration Circuit—
MC68EC020 (Two-Wire) to DMA (Three-Wire)
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