AT49BV001A Ver la hoja de datos (PDF) - Atmel Corporation

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AT49BV001A

1-megabit (128K x 8) Single 2.7-volt Battery-Voltage™ Flash Memory

Atmel Corporation 

AT49BV001A(N)(T)

DATA POLLING: The AT49BV001A(N)(T) features DATA polling to indicate the end of a pro-

gram 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 outputs and the next cycle may begin. DATA polling may begin at any time

during the program cycle.

TOGGLE BIT: In addition to DATA polling the AT49BV001A(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.

HARDWARE DATA PROTECTION: Hardware features protect against inadvertent programs

to the AT49BV001A(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.

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3364C–FLASH–9/03

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