LG Semicon
GM72V66841CT/CLT
DQM Truth Table
CKE
n-1
Function
Symbol
DQM
n
Write enable/output enable
Write inhibit/output disable
ENB
H
H
X
X
L
MASK
H
* Notes : H: VIH, L: VIL, X: VIH or VIL.
Write : lDID is needed.
Read : lDOD is needed.
During writing, data is written by setting DQM to
Low. When DQM is set to High, the previous
data is held (the new data is not written). Desired
data can be masked during burst read or burst
write by setting DQM. For details, refer to the
The GM72V66841CT/CLT can mask input/output
data by means of DQM.
During reading, the output buffer is set to Low-Z
by setting DQM to Low, enabling data output. On
the other hand, when DQM is set to High, the
output buffer becomes High-Z, disabling data
output.
DQM
control
section
of
the
GM72V66841CT/CLT operating instructions.
6
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