EM639165
DQM CONTROL
DQM is a dual function signal defined as the data mask for
writesandtheoutputdisableforreads. Duringwrites, DQM(U,L)
masksinputdatawordbyword. DQM(U,L)towritemasklatency
is0. Duringreads, DQM(U,L)forcesoutputtoHi-Zwordbyword.
DQM(U,L) to output Hi-Z latency is 2.
DQM Function(CL=3)
CLK
Command
DQM
Write
READ
D0
D2
D3
Q0
Q1
Q3
DQ
disabled by DQM(U,L)=H
masked by DQM(U,L)=H
Preliminary
Rev 1.0 Feb. 2001
28