10
P/N:PM1189
REV. 0.02, JUL. 21, 2005
MX29LV033C
Performing a read operation with A1=VIH, it will produce
00H at data outputs (Q0-Q7) for an unprotected sector. It
is noted that all sectors are unprotected after the chip
unprotected algorithm is completed.
TEMPORARY SECTOR GROUP UNPROTECTED OP-
ERATION
This feature allows temporary unprotected of previously
protected sector to change data in-system. The Tempo-
rary Sector Unprotected mode is activated by setting
the RESET# pin to VID(11.5V-12.5V). During this mode,
formerly protected sectors can be programmed or erased
as unprotected sector. Once VID is remove from the RE-
SET# pin, all the previously protected sectors are pro-
tected again.
SILICON ID READ OPERATION
Flash memories are intended for use in applications where
the local CPU alters memory contents. As such, manu-
facturer and device codes must be accessible while the
device resides in the target system. PROM program-
mers typically access signature codes by raising A9 to
a high voltage. However, multiplexing high voltage onto
address lines is not generally desired system design prac-
tice.
MX29LV033C provides hardware method to access the
silicon ID read operation. Which method requires VID on
A9 pin, VIL on CE#, OE#, A6, and A1 pins. Which apply
VIL on A0 pin, the device will output MXIC's manufac-
ture code of C2H. Which apply VIH on A0 pin, the device
will output MX29LV033C device code of A3H.
VERIFY SECTOR GROUP PROTECT STATUS OPERA-
TION
MX29LV033C provides hardware method for sector group
protect status verify. Which method requires VID on A9
pin, VIH on WE# and A1 pins, VIL on CE#, OE#, A6, and
A0 pins, and sector address on A16 to A21 pins. Which
the identified sector is protected, the device will output
01H. Which the identified sector is not protect, the device
will output 00H.
A21
A15
A8
to
to
to
DESCRIPTION
CE# OE# WE# A16
A10
A9
A7
A6
A5
A1
A0
Q0 to Q7
Manufacturer ID:MXIC
L
L
H
X
X
VID
X
L
X
L
L
C2H
Device ID:MX29LV033C
L
L
H
X
X
VID
X
L
X
L
H
A3H
Sector Protection
L
L
H
SA
X
VID
X
L
X
H
L
01h(protected)
Verification
00h(unprotected)
L=Logic Low=VIL,H=Logic High=VIH, SA=Sector Address, X=Don't care
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