Rev: 1.10 9/2000

7/34

© 2000, Giga Semiconductor, Inc.

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

Preliminary

GS881E18/36T-11/11.5/100/80/66

ByteSafe

™ Parity Functions

This SRAM includes a write data parity check that checks the validity of data coming into the RAM on write cycles. In Flow

Through mode, write data errors are reported in the cycle following the data input cycle. In Pipeline mode, write data errors are

reported one clock cycle later. (See Write Parity Error Output Timing Diagram.) The Data Parity Mode (DP) pin must be tied

high to set the RAM to check for even parity or low to check for odd parity. Read data parity is not checked by the RAM as data.

Validity is best established at the data’s destination. The Parity Error Output is an open drain output and drives low to indicate a

parity error. Multiple Parity Error Output pins may share a common pull-up resistor.

Write Parity Error Output Timing Diagram

BPR 1999.05.18

CK

D In A

D In B

D In C

D In D

D In E

tKQ

tLZ

DQ

QE

tKQ

tLZ

DQ

QE

D In A

D In B

D In C

D In D

D In E

Err A

Err A

Err C

Err C

tHZ

tKQX

tHZ

tKQX