GENERAL DESCRIPTION
The Pm49FL002/004 are 2 Mbit/4 Mbit 3.3 Volt-only Flash Memories used as BIOS in PCs and Notebooks. These devices are designed to use a single low voltage, ranging from 3.0 Volt to 3.6 Volt, power supply to perform in-system or off-system read, erase and program operations. The 12.0 Volt VPP power supply are not required for the program and erase operations of devices. The devices conform to Intel® Low Pin Count (LPC) Interface specification revision 1.1 and also read-compatible with Intel 82802 Firmware Hub (FWH) for most PC and Notebook applications. The Pm49FL002/004 support two configurable interfaces: In-system hardware interface which can automatic detect the FWH or LPC memory cycle for in-system read and write operations, and Address/Address Multiplexed (A/A Mux) interface for fast manufacturing on EPROM Programmers. These devices are designed to work with both Intel Family chipset and Non-Intel Family Chipset platforms, it will provide PC and Notebook manufacturers great flexibility and simplicity for design, procurement, and material inventory.

The memory array of Pm49FL002 is divided into uniform 4 Kbyte sectors, or uniform 16 Kbytes blocks (sector group - consists of four adjecent sectors). The memory array of Pm49FL004 is divided into uniform 4 Kbyte sectors, or uniform 64 Kbyte blocks (sector group - consists of sixteen adjecent sectors). The sector or block erase feature allows users to flexibly erase a memory area as small as 4 Kbyte or as large as 64 Kbyte by one single erase operation without affecting the data in others. The chip erase feature allows the whole memory to be erased in one single erase operation. The devices can be programmed on a byte-by-byte basis after performing the erase operation.