MX26L1620 Macronix International, MX26L1620 Datasheet - Page 13

• Manufacturer Part Number: MX26L1620
• Description: 16M-BIT [1M x 16] CMOS MULTIPLE-TIME-PROGRAMMABLE EPROM
• Manufacturer: Macronix International

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Q7: Data Polling
The Data Polling bit, Q7, indicates to the host sys-tem
whether an Automatic Algorithm is in progress or com-
pleted. Data Polling is valid after the rising edge of the
final WE pulse in the program or erase command se-
quence.
During the Automatic Program algorithm, the device out-
puts on Q7 the complement of the datum programmed
to Q7. This Q7 status also applies to programming dur-
ing Er ase Suspend. When the Automatic Program algo-
rithm is complete, the device outputs the datum pro-
grammed to Q7. The system must provide the program
address to read valid status information on Q7.
During the Automatic Erase algorithm, Data Polling pro-
duces a "0" on Q7. When the Automatic Erase algorithm
is complete. Data Polling produces a "1" on Q7. This is
analogous to the complement/true datum out-put de-
scribed for the Automatic Program algorithm: the erase
function changes all the bits to "1" prior to this, the de-
vice outputs the "complement,” or "0".”
Q6:Toggle BIT I
Toggle Bit I on Q6 indicates whether an Automatic Pro-
gram or Erase algorithm is in progress or complete. Toggle
Bit I may be read at any address, and is valid after the
rising edge of the final WE or CE, whichever happens
first pulse in the command sequence(prior to the pro-
gram or erase operation).
During an Automatic Program or Erase algorithm opera-
tion, successive read cycles to any address cause Q6
to toggle. The system may use either OE or CE to con-
trol the read cycles. When the operation is complete, Q6
stops toggling.
Q5:Program/Erase Timing
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 condi-
tion.
P/N:PM0827
13
If this time-out condition occurs during sector erase op-
eration, it specifies that a is bad and it may not be re-
used. Write the Reset command sequence to the de-
vice, and then execute program or erase command se-
quence. 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.
If this time-out condition occurs during the word program-
ming operation, the word is bad and maynot be reused,
(other word are still functional and can be reused).
MX26L1620
REV. 0.4, JAN. 31, 2002