MX26LV160AT Macronix International, MX26LV160AT Datasheet - Page 15

• Manufacturer Part Number: MX26LV160AT
• Description: 16M-BIT [2Mx8/1Mx16] CMOS SINGLE VOLTAGE 3V ONLY BOOT SECTOR HIGH SPEED eLiteFlashTM MEMORY
• Manufacturer: Macronix International

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first. If the toggle bit is not toggling, the device has com-
pleted the program or erase operation. The system can
read array data on Q7-Q0 on the following read cycle.
However, if after the initial two read cycles, the system
determines that the toggle bit is still toggling, the sys-
tem also should note whether the value of Q5 is high
(see the section on Q5). If it is, the system should then
determine again whether the toggle bit is toggling, since
the toggle bit may have stopped toggling just as Q5 went
high. If the toggle bit is no longer toggling, the device
has successfully completed the program or erase opera-
tion. If it is still toggling, the device did not complete the
operation successfully, and the system must write the
reset command to return to reading array data.
The remaining scenario is that system initially determines
that the toggle bit is toggling and Q5 has not gone high.
The system may continue to monitor the toggle bit and
Q5 through successive read cycles, determining the sta-
tus as described in the previous paragraph. Alternatively,
it may choose to perform other system tasks. In this
case, the system must start at the beginning of the al-
gorithm when it returns to determine the status of the
operation.
Q5
Exceeded Timing Limits
Q5 will indicate if the program or erase time has exceeded
the specified limits (internal pulse count). Under these
conditions Q5 will produce a "1". This time-out condition
indicates that the program or erase cycle was not suc-
cessfully completed. Data# Polling and Toggle Bit are
the only operating functions of the device under this con-
dition.
If this time-out condition occurs during sector erase op-
eration, it specifies that a particular sector is bad and it
may not be reused. However, other sectors are still func-
tional and may be used for the program or erase opera-
tion. The device must be reset to use other sectors.
Write the Reset command sequence to the device, and
then execute program or erase command sequence. This
allows the system to continue to use the other active
sectors in the device.
If this time-out condition occurs during the chip erase
operation, it specifies that the entire chip is bad or com-
bination of sectors are bad.
P/N:PM1123
MX26LV160AT/AB
15
If this time-out condition occurs during the word/byte pro-
gramming operation, it specifies that the entire sector
containing that byte is bad and this sector may not be
reused, (other sectors are still functional and can be re-
used).
The time-out condition will not appear if a user tries to
program a non blank location without erasing. Please note
that this is not a device failure condition since the device
was incorrectly used.
REV. 1.1, NOV. 18, 2004