MX29LV640MT/B
MX29LV640MT/B uses a command register to manage
this functionality.
AUTOMATIC SECTOR ERASE
The MX29LV640MT/B is sector(s) erasable using
MXIC's Auto Sector Erase algorithm. Sector erase modes
allow sectors of the array to be erased in one erase cycle.
The Automatic Sector Erase algorithm automatically pro-
grams the specified sector(s) prior to electrical erase.
The timing and verification of electrical erase are con-
trolled internally within the device.
MXIC Flash technology reliably stores memory contents
even after 100,000 erase and program cycles. The MXIC
cell is designed to optimize the erase and program
mechanisms. In addition, the combination of advanced
tunnel oxide processing and low internal electric fields
for erase and programming operations produces reliable
cycling. The MX29LV640MT/B uses a 2.7V to 3.6VVCC
supply to perform the High Reliability Erase and auto
Program/Erase algorithms.
AUTOMATIC ERASE ALGORITHM
The highest degree of latch-up protection is achieved
with MXIC's proprietary non-epi process. Latch-up pro-
tection is proved for stresses up to 100 milliamperes on
address and data pin from -1V to VCC + 1V.
MXIC's Automatic Erase algorithm requires the user to
write commands to the command register using stan-
dard microprocessor write timings. The device will auto-
matically pre-program and verify the entire array. Then
the device automatically times the erase pulse width,
provides the erase verification, and counts the number
of sequences. A status bit toggling between consecu-
tive read cycles provides feedback to the user as to the
status of the programming operation.
AUTOMATIC PROGRAMMING
The MX29LV640MT/B is byte/word/page programmable
using the Automatic Programming algorithm. The Auto-
matic Programming algorithm makes the external sys-
tem do not need to have time out sequence nor to verify
the data programmed. The typical chip programming time
at room temperature of the MX29LV640MT/B is less than
63 seconds.
Register contents serve as inputs to an internal state-
machine which controls the erase and programming cir-
cuitry. During write cycles, the command register inter-
nally latches address and data needed for the program-
ming and erase operations. During a system write cycle,
addresses are latched on the falling edge, and data are
latched on the rising edge of WE# .
AUTOMATIC PROGRAMMING ALGORITHM
MXIC's Flash technology combines years of EPROM
experience to produce the highest levels of quality, reli-
ability, and cost effectiveness. The MX29LV640MT/B
electrically erases all bits simultaneously using Fowler-
Nordheim tunneling. The bytes are programmed by us-
ing the EPROM programming mechanism of hot elec-
tron injection.
MXIC's Automatic Programming algorithm require the user
to only write program set-up commands (including 2 un-
lock write cycle and A0H) and a program command (pro-
gram data and address). The device automatically times
the programming pulse width, provides the program veri-
fication, and counts the number of sequences. A status
bit similar to DATA# polling and a status bit toggling be-
tween consecutive read cycles, provide feedback to the
user as to the status of the programming operation.
During a program cycle, the state-machine will control
the program sequences and command register will not
respond to any command set. During a Sector Erase
cycle, the command register will only respond to Erase
Suspend command. After Erase Suspend is completed,
the device stays in read mode. After the state machine
has completed its task, it will allow the command regis-
ter to respond to its full command set.
AUTOMATIC CHIP ERASE
The entire chip is bulk erased using 50 ms erase pulses
according to MXIC's Automatic Chip Erase algorithm.
Typical erasure at room temperature is accomplished in
less than 64 seconds. The Automatic Erase algorithm
automatically programs the entire array prior to electrical
erase. The timing and verification of electrical erase are
controlled internally within the device.
P/N:PM1079
REV. 1.2, FEB. 27, 2006
2
Macronix [ MACRONIX INTERNATIONAL ]
