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INTEL386

Intel386 SX MICROPROCESSOR

Intel 

Intel386TM SX MICROPROCESSOR

1 0 PIN DESCRIPTION (Continued)

Symbol

HOLD

HLDA

INTR

NMI

BUSY

ERROR

PEREQ

FLT

NC

VCC

VSS

Type

Pin

Name and Function

I4

Bus Hold Request input allows another bus master to request

control of the local bus See Bus Arbitration Signals for

additional information

O3

Bus Hold Acknowledge output indicates that the Intel386 SX

Microprocessor has surrendered control of its local bus to

another bus master See Bus Arbitration Signals for additional

information

I 40

Interrupt Request is a maskable input that signals the Intel386

SX Microprocessor to suspend execution of the current program

and execute an interrupt acknowledge function See Interrupt

Signals for additional information

I 38

Non-Maskable Interrupt Request is a non-maskable input that

signals the Intel386 SX Microprocessor to suspend execution of

the current program and execute an interrupt acknowledge

function See Interrupt Signals for additional information

I 34

Busy signals a busy condition from a processor extension See

Coprocessor Interface Signals for additional information

I 36

Error signals an error condition from a processor extension See

Coprocessor Interface Signals for additional information

I 37

Processor Extension Request indicates that the processor has

data to be transferred by the Intel386 SX Microprocessor See

Coprocessor Interface Signals for additional information

I 28

Float is an input which forces all bidirectional and output signals

including HLDA to the tri-state condition This allows the

electrically isolated Intel386SX PQFP to use ONCE (On-Circuit

Emulation) method without removing it from the PCB See Float

for additional information

- 20 27 29-31 43-47 No Connects should always be left unconnected Connection of

a N C pin may cause the processor to malfunction or be

incompatible with future steppings of the Intel386 SX

Microprocessor

I 8-10 21 32 39

42 48 57 69

71 84 91 97

System Power provides the a5V nominal DC supply input

I 2 5 11-14 22

35 41 49-50

63 67-68

77-78 85 98

System Ground provides the 0V connection from which all

inputs and outputs are measured

5

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