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STMicroelectronics Flash memory eliminates external RAM

Posted: 22 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? stm? memory chip? memory? flash memory?

Designed for digital consumer products such as STBs, PDAs, camcorders, and printers, the M58LW032A 32Mb Flash memory chip stores data, but allows direct execution of stored codes and eliminates the need for a separate RAM. The device can also be used in network routers and car navigation systems.

The device features 56MHz synchronous data bursts, a 16-bit data bus, and an operating voltage range of 2.7V to 3.6V, as well as a voltage I/O buffer. The M58LW032A also performs asynchronous 90ns/25ns page mode read, 90ns random access, and address-latch-controlled read operations.

The chip also offers a 16word write-buffer that lets a microprocessor program from one to 16words in parallel, speeding programming while freeing the processor for other tasks. A controller that conforms to the Common Flash Interface specification and executes standard JEDEC control commands, is also included.

To simplify system design, the M58LW032A consists of 64 uniform memory blocks of 32Kwords each. Blocks are independently erasable and programmable, making it possible to erase old data while preserving data that is valid. For data security, individual blocks can be protected from being accidentally erased or programmed. In addition, a separate enable line, when held low, inhibits all erase and program operations.

The chip can also suspend a programming operation to allow data to be read from other blocks. Erase operations can also be suspended for the sake of either reading or programming another block before resuming.

The M58LW032A also includes a 128-bit protection register comprising two 64-bit segments. The first segment contains a manufacturer's code, while the second is a user programmable and lockable bit field.

Available in TSOP56 and TBGA64 packages, the M58LW032A operates over the temperature range of -45C to 85C, and is capable of >100,000 erase and program cycles per block.

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