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AT49LV001NT-90VI Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT49LV001NT-90VI Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 20 page  AT49BV/LV001(N)(T) 2 AT49BV/LV001NT pin 1 for the DIP and PLCC packages and pin 9 for the TSOP package are don’t connect pins. To allow for simple in-system reprogrammability, the AT49BV/LV001(N)(T) does not require high input voltages for programming. Three-volt-only commands determine the read and programming operation of the device. Reading data out of the device is similar to reading from an EPROM; it has standard CE, OE, and WE inputs to avoid bus con- tention. Reprogramming the AT49BV/LV001(N)(T) is per- formed by erasing a block of data and then programming on a byte by byte basis. The byte programming time is a fast 50 µs. The end of a program cycle can be optionally detected by the DATA polling feature. Once the end of a byte program cycle has been detected, a new access for a read or program can begin. The typical number of program and erase cycles is in excess of 10,000 cycles. The device is erased by executing the erase command sequence; the device internally controls the erase opera- tions. There are two 8K byte parameter block sections and two main memory blocks. The device has the capability to protect the data in the boot block; this feature is enabled by a command sequence. The 16K byte boot block section includes a reprogramming lock out feature to provide data integrity. The boot sector is designed to contain user secure code, and when the fea- ture is enabled, the boot sector is protected from being reprogrammed. In the AT49BV/LV001N(T), once the boot block program- ming lockout feature is enabled, the contents of the boot block are permanent and cannot be changed. In the AT49BV/LV001(T), once the boot block programming lock- out feature is enabled, the contents of the boot block can- not be changed with input voltage levels of 5.5 volts or less. Block Diagram CONTROL LOGIC Y DECODER PARAMETER BLOCK 1 (8K BYTES) BOOT BLOCK (16K BYTES) OE WE CE RESET ADDRESS INPUTS VCC GND AT49BV/LV001(N) DATA INPUTS/OUTPUTS I/O7 - I/O0 8 X DECODER PARAMETER BLOCK 2 (8K BYTES) MAIN MEMORY BLOCK 1 (32K BYTES) MAIN MEMORY BLOCK 2 (64K BYTES) PROGRAM DATA LATCHES Y-GATING INPUT/OUTPUT BUFFERS 1FFFF 10000 0FFFF 08000 07FFF 06000 05FFF 04000 03FFF 00000 PARAMETER BLOCK 1 (8K BYTES) BOOT BLOCK (16K BYTES) AT49BV/LV001(N)T DATA INPUTS/OUTPUTS I/O7 - I/O0 8 PARAMETER BLOCK 2 (8K BYTES) MAIN MEMORY BLOCK 1 (32K BYTES) MAIN MEMORY BLOCK 2 (64K BYTES) PROGRAM DATA LATCHES Y-GATING INPUT/OUTPUT BUFFERS 1FFFF 1C000 1BFFF 1A000 19FFF 18000 17FFF 10000 0FFFF 00000 |
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