Summary Of 80386 Signal Pins - Intel 80386 Reference Manual

inter
LOCAL BUS INTERFACE
Table 3-1. Summary of 80386 Signal Pins
Input
Output
Signal Name Signal Function
Active Input! Synch or
High Impedance
State Output Asynch
to CLK2
During HLDA?
CLK2 Clock
-
I
- -
DO-D31 Data Bus High
I/O
8 Yes
BEO#-BE3# Byte Enables Low 0
-
Yes
A2-A31 Address Bus High 0
-
Yes
W/R#
Write-Read Indication
High
0
-
Yes
D/C#
Data-Control Indication High 0
-
Yes
M/IO#
Memory-I/O Indication High
0
-
Yes
LOCK# Bus Lock Indication Low 0
-
Yes
AD8#
Address 8tatus
Low
0
-
Yes
NA# Next Address Request Low I 8
-
B816# Bus 8ize 16 Low I 8
!
-
READY# Transfer Acknowledge Low I 8
-
HOLD Bus Hold Request High I 8
-
HLDA Bus Hold Acknowledge High 0
-
No
PEREQ Coprocessor Request High I A
-
BU8Y# Coprocessor Busy Low I A
-
ERROR# Coprocessor Error Low I A
-
INTR Maskable Interrupt Request High I
A
-
NMI Non-Maskable Intrpt Request High
I
A
-
RE8ET Reset High I 8
-
3-3