6.42

IDT7052S/L

High-Speed 2K x 8 FourPort™ Static RAM

Military, Industrial and Commercial Temperature Ranges

10

Functional Description

The IDT7052 provides four ports with separate control, address, and

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

in memory. These devices have an automatic power down feature

controlled by

CE. The CE controls on-chip power down circuitry that

permitstherespectiveporttogointostandbymodewhennotselected(

CE

permitted. Each port has its own Output Enable control (

OE). In the read

mode, the port’s

OE turns on the output drivers when set LOW. READ/

WRITE conditions are illustrated in the table below.

Timing Waveform of Write with BUSY Input

NOTES:

1.

NOTES:

2. If

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

location at the same time.

NOTES:

1. Assume

2.

3. 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.

2674 drw 11

MATCH

VALID

MATCH

VALID

2674 drw 12

R/

R/

(1)

,

Any Port

(1)

R/

W

CE

OE

Function

X

H

X

Z

Port Deselected: Power-Down

XH

X

Z

LL

X

Data on port written into memory

(2)

HL

L

Data in memory output on port

X

X

H

Z

Outputs Disabled

2674 tbl 11