Intel 386 manual ~~Y

85C220 CLOCK &

"ESET

GENERATOR

CLK

RESET CLK2

I T

TO

INTIP0-7INTERRUPT

~ AD 8259A ft-

cs#~I~ 'f

l

®

0>

ell

RESET CLK2

ADS#

INT"

NA#

M/IO#

W/R#

D/C

READY#

1386'·DX

CPU

A12-A20

8EO#

8E1#

8516#

DOo015

J				--		~"DY~
-					CLK
					IOPLD1
					CLK2
					NA	TRtOEN -
					MIlO	-
					WI"	INTA
			-		D/C	EPRD
				-	A3.	IOWR
~~Y					TlMEDLY	lORD
				-
		-			BUSCYC	RECV
	READY
AS
~		74F138
A3
		ADDRESS BUS				ADDRESS BUS
					OT/R# DEN#
A					74F245
		DATA BUS			"TRANSCElVERx.
'I					r

.....-

-

	CLK2	IOPLD2	-
			-
-	CLK	WICNTO
	ADS	WTCHT'	-
	READY	WTCNT2	-
	INTA	P20RB	-
	EPRDY		-
			-
	IOWA	PlRECYC
	lORD	BUSCYC	-
-	RECY	ALEIO	-	~
	CS1WS	nUEDLY -
-	CS3WS	CSSWS -

" ALE# r 74F373

LATCHES A1-A15

x.

TO DATA BUS

I

ijE

~ 27256A

EPROM

V' X.

11

_ INTA _IOWR

_lORD

In

iii

ig

-ClOP~

:_SELECT

..

"ID

C

g~

~TO

DATA BUS

V'

231732i6-4

s::

m

s:: o

~

Z

-I m

:::D

~

Z

G)

Figure 6-4. I/O Controller Schematic