AT49BV002A Ver la hoja de datos (PDF) - Atmel Corporation
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AT49BV002A Datasheet PDF : 19 Pages
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4.8 DATA Polling
The AT49BV002A(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 AT49BV002A(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 AT49BV002A(N)(T) in the
following ways: (a) VCC sense: if VCC is below 1.8V (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
program cycle.
6 AT49BV002A(N)(T)
3353G–FLASH–8/05
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