MC68020 Motorola, MC68020 Datasheet - Page 43

• Manufacturer Part Number: MC68020
• Description: (MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
• Manufacturer: Motorola

3.13 SIGNAL SUMMARY
Table 3-2 provides a summary of the characteristics of the signals discussed in this
section. Signal names preceded by an asterisk (*) are implemented in the MC68020 and
not implemented in the MC68EC020.
*
**
3- 8
Function Codes
Address Bus
Data Bus
Transfer Size
*Operand Cycle Start
*External Cycle Start
Read/Write
Read-Modify-Write Cycle
Address Strobe
Data Strobe
*Data Buffer Enable
Data Transfer and Size Acknowledge
Interrupt Priority Level
*Interrupt Pending
Autovector
Bus Request
Bus Grant
*Bus Grant Acknowledge
Reset
Halt
Bus Error
Cache Disable
Clock
Power Supply
Ground
This signal is implemented in the MC68020 and not implemented in the MC68EC020.
Open-drain
MC68020
MC68EC020
Signal Function
Table 3-2. Signal Summary
M68020 USER’S MANUAL
DSACK1, DSACK0
Signal Name
SIZ1, SIZ0
IPL2–IPL0
FC2–FC0
A31–A0
A23–A0
D31–D0
BGACK
RESET
IPEND
AVEC
HALT
DBEN
BERR
RMC
CDIS
GND
OCS
CLK
V
ECS
R/ W
DS
BR
BG
AS
CC
Input/Output
Input/Output
Input/Output
Input/Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Active State
High/Low
High
High
High
High
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
—
—
—
Three-State
MOTOROLA
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
—
—
—
—
—
—
—
—
—
—
**
**