IDT7014S

High-Speed 4K x 9 Dual-Port Static RAM

Industrial and Commercial Temperature Ranges

8

Truth Table I – Read/Write Control

Functional Description

The IDT7014 provides two ports with separate control, address,

and I/O pins that permit independent access for reads or writes to

any location in memory. It lacks the chip enable feature of CMOS Dual

Ports,thusitoperatesinactivemodeassoonaspowerisapplied.Each

porthasitsownOutputEnablecontrol(OE).Inthereadmode,theport’s

OEturnsontheoutputdriverswhensetLOW. Theuserapplicationshould

avoidsimultaneouswriteoperationstothesamememorylocation.There

isnoon-chiparbitrationcircuitrytoresolvewritepriorityandpartialdata

frombothportsmaybewritten.READ/WRITEconditionsareillustrated

in Table 1.

NOTE:

'H' = HIGH,'L' = LOW, 'X' = Don’t Care, and 'Z' = HIGH Impedance.

2528 drw 10

R/

W

ADDRESS

OE

(5)

(4)

(3)

(3)

R/

WOE

Function

Data written into memory

HL

Data in memory output on port

X

H

Z

High-impedance outputs

2528 tbl 10

NOTES:

1. R/W must be HIGH during all address transitions.

3. During this period, the I/O pins are in the output state, and input signals must not be applied.

4. Transition is measured 0mV from the Low or High-impedance voltage with the Output Test Load (Figure 2).