MC68EC020FG25 Freescale Semiconductor, MC68EC020FG25 Datasheet - Page 300

• Manufacturer Part Number: MC68EC020FG25
• Description: IC MPU 32 BIT 25MHZ 100-QFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC020FG25

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

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.
MOTOROLA
MC68EC020
MC68EC020 (Two-Wire) to DMA (Three-Wire)
BGACK
BR
(DMA)
BG
(MC68EC020)
(DMA)
Figure A-1. Bus Arbitration Circuit—
BR
BG
74LS04
M68020 USER’S MANUAL
74LS04
D
CLK
74LS08
74F74
CLR
PR
4
+5 V
Q
Q
BR
(MC68EC020)
BG
(DMA)
BR
BG
BGACK
DMA
A- 1