MX29F200T/B
SET-UP AUTOMATIC CHIP/SECTOR ERASE
COMMANDS
READ/RESET COMMAND
The read or reset operation is initiated by writing the
read/reset command sequence into the command reg-
ister. Microprocessor read cycles retrieve array data.
The device remains enabled for reads until the com-
mand register contents are altered.
Chip erase is a six-bus cycle operation. There are two
"unlock" write cycles. These are followed by writing the
"set-up"command80H. Twomore "unlock"writecycles
are then followed by the chip erase command 10H.
If program-fail or erase-fail happen, the write of F0H will
resetthedevicetoaborttheoperation. Avalidcommand
must then be written to place the device in the desired
state.
The Automatic Chip Erase does not require the device
to be entirely pre-programmed prior to executing the
Automatic Chip Erase. Upon executing the Automatic
Chip Erase, the device will automatically program and
verify the entire memory for an all-zero data pattern.
When the device is automatically verified to contain an
all-zeropattern,aself-timedchiperaseandverifybegin.
Theeraseandverifyoperationsarecompletedwhenthe
data on Q7 is "1" at which time the device returns to the
Read mode. The system does not require to provide
any control or timing during these operations.
SILICON-ID-READ COMMAND
Flash memories are intended for use in applications
where the local CPU alters memory contents. As such,
manufacturer and device codes must be accessible
while the device resides in the target system. PROM
programmers typically access signature codes by rais-
ing A9 to a high voltage. However, multiplexing high
voltage onto address lines is not generally desired
system design practice.
When using the Automatic Chip Erase algorithm, note
that the erase automatically terminates when adequate
erasemarginhasbeenachievedforthememoryarray(no
erase-verified command is required).
The MX29F200T/B contains a Silicon-ID-Read opera-
tiontosupplementtraditionalPROMprogrammingmeth-
odology. The operation is initiated by writing the read
silicon ID command sequence into the command regis-
ter. Following the command write, a read cycle with
A1=VIL,A0=VILretrievesthemanufacturercodeofC2H/
00C2H. A read cycle with A1=VIL, A0=VIH returns the
devicecodeof51H/2251HforMX29F200T,57H/2257H
for MX29F200B.
IftheEraseoperationwasunsuccessful, thedataonQ5
is"1"(seeTable4),indicatinganeraseoperationexceed
internal timing limit.
Theautomaticerasebeginsontherisingedgeofthelast
WE pulse in the command sequence and terminates
when the data on Q7 is "1" and the data on Q6 stops
toggling for two consecutive read cycles, at which time
the device returns to the Read mode.
TABLE 3. EXPANDED SILICON ID CODE
Pins
A0
A1
Q15~Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1 Q0 Code(Hex) Code
Manufacture code
Word
Byte
Word
Byte
VIL VIL
VIL VIL
VIH VIL
VIH VIL
VIH VIL
VIH VIL
00H
X
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
0
1
1
1
1
1
0
00C2H
C2H
Device code
22H
X
2251H
for MX29F200T
Device code
51H
Word
Byte
22H
X
2257H
for MX29F200B
Sector Portection
Verification
57H
X
X
VIH
VIH
X
01H(Protected)
00H(Unprotected)
X
P/N:PM0549
REV. 1.3 , DEC. 24, 2001
8
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