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M50FLW040A Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M50FLW040A
Description  4 Mbit (5 x 64KByte Blocks 3 x 16 x 4KByte Sectors) 3V Supply Firmware Hub / Low Pin Count Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com

M50FLW040A Datasheet(HTML) 6 Page - STMicroelectronics

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M50FLW040A, M50FLW040B
The M50FLW040 is a 4 Mbit (512Kb x8) non-vola-
tile memory that can be read, erased and repro-
grammed. These operations can be performed
using a single low voltage (3.0 to 3.6V) supply. For
fast programming and fast erasing in production
lines, an optional 12V power supply can be used
to reduce the erasing and programming time.
The memory is divided into 8 Uniform Blocks of
64 KBytes each, three of which are divided into 16
uniform sectors of 4 KBytes each (see APPENDIX
A. for details). All blocks and sectors can be
erased independently. So, it is possible to pre-
serve valid data while old data is erased. Blocks
can be protected individually to prevent accidental
program or erase commands from modifying their
Program and erase commands are written to the
Command Interface of the memory. An on-chip
Program/Erase Controller simplifies the process of
programming or erasing the memory by taking
care of all of the special operations that are re-
quired to update the memory contents. The end of
a program or erase operation can be detected and
any error conditions identified. The command set
to control the memory is consistent with the JE-
DEC standards.
Two different bus interfaces are supported by the
The primary interface, the FWH/LPC
Interface, uses Intel’s proprietary Firmware
Hub (FWH) and Low Pin Count (LPC)
protocol. This has been designed to remove
the need for the ISA bus in current PC
Chipsets. The M50FLW040 acts as the PC
BIOS on the Low Pin Count bus for these PC
The secondary interface, the Address/
Address Multiplexed (or A/A Mux) Interface, is
designed to be compatible with current Flash
Programmers, for production line
programming prior to fitting the device in a PC
The memory is supplied with all the bits erased
(set to ’1’).

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