Signal Summary - Motorola M68000 User Manual

3.11 SIGNAL SUMMARY

Table 3-4 summarizes the signals discussed in the preceding paragraphs.
Signal Name
Address Bus
Data Bus
Address Strobe
Read/Write
Data Strobe
Upper and Lower Data Strobes
Data Transfer Acknowledge
Bus Request
Bus Grant
Bus Grant Acknowledge
Interrupt Priority Level
Bus Error
Mode
Reset
Halt
Enable
Valid Memory Address
Valid Peripheral Address
Function Code Output
Clock
Power Input
Ground
*Open drain.
3-10 M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Freescale Semiconductor, Inc.
Table 3-4. Signal Summary
Mnemonic Input/Output
A0–A23 Output
D0–D15 Input/Output
Output
AS
R/ W Output
Output
DS
UDS, LDS Output
Input
DTACK
BR Input
Output
BG
BGACK Input
IPL 0, IPL 1, Input
IPL 2
Input
BERR
MODE Input
Input/Output
RESET
HALT Input/Output
E Output
VMA Output
Input
VPA
FC0, FC1, Output
FC2
CLK Input
V CC Input
GND Input
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HALT
Active State On
High Yes
High Yes
Low No
Read-High No
Write-Low
Low No
Low No
Low No
Low No
Low No
Low No
Low No
Low No
High —
Low No*
Low No*
High No
Low No
Low No
High No
High No
— —
— —
Hi-Z
On Bus
Relinquish
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
—
No*
No*
No
Yes
No
Yes
No
—
—
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