6.42

IDT7054S/L

High-Speed 4K x 8 FourPort™ Static RAM

Industrial and Commercial Temperature Ranges

9

Functional Description

TheIDT7054providesfourportswithseparatecontrol,address,and

I/Opinsthatpermitindependentaccessforreadsorwritestoanylocation

in memory. These devices have an automatic power down feature

controlled by CE. The CE controls on-chip power down circuitry

thatpermitstherespectiveporttogointostandbymodewhennotselected

ispermitted.EachporthasitsownOutputEnablecontrol(OE).Intheread

mode, the port’s OE turns on the output drivers when set LOW. READ/

WRITEconditionsareillustratedinthetable.

Table I – Read/Write Control

NOTES:

2. For valid write operation, no more than one port can write to the same address

location at the same time.

3241 drw 09

MATCH

R/

VALID

MATCH

VALID

NOTES:

2. All timing is the same for left and right ports. Port "A" may be either of the four ports and Port "B" is any other port.

R/W

CE

OE

Function

X

H

X

Z

Port Deselected: Power-Down

XH

X

Z

LL

X

HL

L

Data in memory output on port

XX

H

Z

Outputs Disabled

3241 tbl 11