Intel mcs-48 manual Read Cycle, Write Cycle

8155/8156/8155-2/8156-2

WAVEFORMS

a. Read Cycle

CE (8155 I

OR

CE 18156I

101M

AL E

b. Write Cycle

CE 18155I

OR

CE 18156I

IO/i>n

ADO_7

ALE

\-					\
I		-'			/
		'\
\	.	/			\
		tA:D
~		ADDRESS	~ DATA VALID		~
	- + -- t AL ______
If-		--- t LA -----
		l\			(
f----tLL~			I... t RDE ..	I--tRDF -
		~I'-l ~tRD_		V	I\-
		---- tLc -
				-	t eL -------
			!----------tee ~ ---------- tRY ~

	\					\
	I		-'[\			/
	\		,V			~
	~	ADDRESS	K	)	DATA VALID	-"K
	I --- t AL -- I --- tLA -				-tow---------+- - tel -
l	--t lL -	1\\-				V
		---- t Le ---:1			-	two ------.
					-,1
				I~ tcc~ --------- tRY -----------"--

Figure 12. 8155/8156 Read/Write Timing Diagrams

6-93