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AT49F002 Datasheet(PDF) 6 Page - ATMEL Corporation

Part No. AT49F002
Description  2-megabit (256K x 8) 5-volt Only Flash Memory
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT49F002 Datasheet(HTML) 6 Page - ATMEL Corporation

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6
3354F–FLASH–2/05
AT49F002A(N)(T)
4.7
Product Identification
The product identification mode identifies the device and manufacturer as Atmel. It may be
accessed by hardware or software operation. The hardware operation mode can be used by an
external programmer to identify the correct programming algorithm for the Atmel product.
For details, see Operating Modes (for hardware operation) or Software Product Identification.
The manufacturer and device code is the same for both modes.
4.8
DATA Polling
The AT49F002A(N)(T) features DATA polling to indicate the end of a program cycle. During a
program cycle an attempted read of the last byte loaded will result in the complement of the
loaded data on I/O7. Once the program cycle has been completed, true data is valid on all out-
puts and the next cycle may begin. DATA polling may begin at any time during the program
cycle.
4.9
Toggle Bit
In addition to DATA polling the AT49F002A(N)(T) provides another method for determining the
end of a program or erase cycle. During a program or erase operation, successive attempts to
read data from the device will result in I/O6 toggling between one and zero. Once the program
cycle has completed, I/O6 will stop toggling and valid data will be read. Examining the toggle bit
may begin at any time during a program cycle.
4.10
Hardware Data Protection
Hardware features protect against inadvertent programs to the AT49F002A(N)(T) in the
following ways: (a) V
CC sense: if VCC is below 3.8V (typical), the program function is inhibited.
(b) Program inhibit: holding any one of OE low, CE high or WE high inhibits program cycles.
(c) Noise filter: pulses of less than 15 ns (typical) on the WE or CE inputs will not initiate a pro-
gram cycle.


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