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AS4LC8M8S0

AS4LC4M16S0

7/5/00

ALLIANCE SEMICONDUCTOR

17

write cycle

Precharge command

A Precharge command can be used to interrupt burst read/write operation during the read cycle. During RD, burst read is

operation is terminated immediately. Data written two cycles prior to the precharge command will be correctly stored. Set

DQM high one cycle before Precharge command and hold it high until Precharge command to mask and avoid writing invalid

data.

read cycle (CL = 2)

read cycle (CL = 3)

write cycle (BL = 8)

CLK

CMD

DQ

Burst stop

Write data

(CL = 2,3)

CLK

CMD

DQ

Read data

PRE

ACT

CLK

CMD

DQ

Read data

PRE

ACT

Q0

Q1

Q2

Q3

CLK

CMD

DQ

Write data

PRE

ACT

Masked

DQM