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AM49LV6408MT10IT Datasheet(PDF) 4 Page - SPANSION |
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AM49LV6408MT10IT Datasheet(HTML) 4 Page - SPANSION |
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4 / 63 page  2 Am49LV6408M November 5, 2003 ADV ANCE I N FO RMAT I O N GENERAL DESCRIPTION Am29LV640MH/L Features The Am29LV640MH/L is a 64 Mbit, 3.0 volt single power supply flash memory device organized as 4,194,304 words. The device has an 16-bit bus and can be programmed either in the host system or in standard EPROM programmers. Each device requires only a single 3.0 volt power supply for both read and write functions. In addition to a V CC input, a high-voltage accelerated program (ACC) feature provides shorter programming times through increased current on the WP#/ACC input. This feature is intended to facilitate factory throughput dur- ing system production, but may also be used in the field if desired. The device is entirely command set compatible with the JEDEC single-power-supply Flash standard. Commands are written to the device using standard microprocessor write timing. Write cycles also inter- nally latch addresses and data needed for the pro- gramming and erase operations. The sector erase architecture allows memory sec- tors to be erased and reprogrammed without affecting the data contents of other sectors. The device is fully erased when shipped from the factory. Device programming and erasure are initiated through command sequences. Once a program or erase oper- ation has begun, the host system need only poll the DQ7 (Data# Polling) or DQ6 (toggle) status bits or monitor the Ready/Busy# (RY/BY#) output to deter- mine whether the operation is complete. To facilitate programming, an Unlock Bypass mode reduces com- mand sequence overhead by requiring only two write cycles to program data instead of four. Hardware data protection measures include a low V CC detector that automatically inhibits write opera- tions during power transitions. The hardware sector protection feature disables both program and erase operations in any combination of sectors of memory. This can be achieved in-system or via programming equipment. The Erase Suspend/Erase Resume feature allows the host system to pause an erase operation in a given sector to read or program any other sector and then complete the erase operation. The Program Suspend/Program Resume feature enables the host system to pause a program operation in a given sector to read any other sector and then complete the pro- gram operation. The hardware RESET# pin terminates any operation in progress and resets the device, after which it is then ready for a new operation. The RESET# pin may be tied to the system reset circuitry. A system reset would thus also reset the device, enabling the host system to read boot-up firmware from the Flash memory device. |
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