MX29LV320MB Macronix International, MX29LV320MB Datasheet - Page 20

• Manufacturer Part Number: MX29LV320MB
• Description: 32M-BIT [4M x 8/2M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: Macronix International

reset immediately terminates the programming operation.
The Byte/Word Program command sequence should be
reinitiated once the device has reset to reading array data,
to ensure data integrity.
Programming is allowed in any sequence and across
sector boundaries. A bit cannot be programmed from a
"0" back to a "1". Attempting to do so may halt the op-
eration and set Q5 to "1", or cause the Data# Polling
algorithm to indicate the operation was successful. How-
ever, a succeeding read will show that the data is still
"0". Only erase operations can convert a "0" to a "1".
Write Buffer Programming
Write Buffer Programming allows the system write to a
maximum of 16 words/32 bytes in one programming op-
eration. This results in faster effective programming time
than the standard programming algorithms. The Write
Buffer Programming command sequence is initiated by
first writing two unlock cycles. This is followed by a third
write cycle containing the Write Buffer Load command
written at the Sector Address in which programming will
occur. The fourth cycle writes the sector address and the
number of word locations, minus one, to be programmed.
For example, if the system will program 6 unique ad-
dress locations, then 05h should be written to the device.
This tells the device how many write buffer addresses
will be loaded with data and therefore when to expect the
Program Buffer to Flash command. The number of loca-
tions to program cannot exceed the size of the write buffer
or the operation will abort.
The fifth cycle writes the first address location and data
to be programmed. The write-buffer-page is selected by
address bits A
must fall within the selected-write-buffer-page. The sys-
tem then writes the remaining address/data pairs into
the write buffer. Write buffer locations may be loaded in
any order.
The write-buffer-page address must be the same for all
address/data pairs loaded into the write buffer. (This
means Write Buffer Programming cannot be performed
across multiple write-buffer pages. This also means that
Write Buffer Programming cannot be performed across
multiple sectors. If the system attempts to load program-
ming data outside of the selected write-buffer page, the
operation will abort.
Note that if a Write Buffer address location is loaded
P/N:PM1129
MAX
-4. All subsequent address/data pairs
20
multiple times, the address/data pair counter will be
decremented for every data load operation. The host sys-
tem must therefore account for loading a write-buffer lo-
cation more than once. The counter decrements for each
data load operation, not for each unique write-buffer-ad-
dress location. Note also that if an address location is
loaded more than once into the buffer, the final data loaded
for that address will be programmed.
Once the specified number of write buffer locations have
been loaded, the system must then write the Program
Buffer to Flash command at the sector address. Any other
address and data combination aborts the Write Buffer
Programming operation. The device then begins program-
ming. Data polling should be used while monitoring the
last address location loaded into the write buffer. Q7, Q6,
Q5, and Q1 should be monitored to determine the device
status during Write Buffer Programming.
The write-buffer programming operation can be suspended
using the standard program suspend/resume commands.
Upon successful completion of the Write Buffer Program-
ming operation, the device is ready to execute the next
command.
The Write Buffer Programming Sequence can be aborted
in the following ways:
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•
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The abort condition is indicated by Q1 = 1, Q7 = DATA#
(for the last address location loaded), Q6 = toggle, and
Q5=0. A Write-to-Buffer-Abort Reset command sequence
must be written to reset the device for the next operation.
Note that the full 3-cycle Write-to-Buffer-Abort Reset com-
mand sequence is required when using Write-Buffer-Pro-
gramming features in Unlock Bypass mode.
Program Suspend/Program Resume Command
Sequence
The Program Suspend command allows the system to
interrupt a programming operation or a Write to Buffer pro-
MX29LV320MT/B
Load a value that is greater than the page buffer size
during the Number of Locations to Program step.
Write to an address in a sector different than the one
specified during the Write-Buffer-Load command.
Write an Address/Data pair to a different write-buffer-
page than the one selected by the Starting Address
during the write buffer data loading stage of the opera-
tion.
Write data other than the Confirm Command after the
specified number of data load cycles.
REV. 1.1 , JUL. 14, 2005
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