M50LPW040 データシートの表示（PDF） - STMicroelectronics

部品番号

コンポーネント説明

メーカー

M50LPW040

4 Mbit (512Kb x8, Uniform Block) 3V Supply Low Pin Count Flash Memory

STMicroelectronics 

M50LPW040

current PC Chipsets; the M50LPW040 acts as the

PC BIOS on the Low Pin Count bus for these PC

Chipsets.

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 to a PC

Motherboard.

The memory is offered in TSOP40 (10 x 20mm)

and PLCC32 packages and it is supplied with all

the bits erased (set to ’1’).

SIGNAL DESCRIPTIONS

There are two different bus interfaces available on

this part. The active interface is selected before

power-up or during Reset using the Interface Con-

figuration Pin, IC.

The signals for each interface are discussed in the

Low Pin Count (LPC) Signal Descriptions section

and the Address/Address Multiplexed (A/A Mux)

Signal Descriptions section below. The supply sig-

nals are discussed in the Supply Signal Descrip-

tions section below.

Figure 4. PLCC Connections

Table 1. Signal Names (LPC Interface) Memory

LAD0-LAD3

Input/Output Communications

LFRAME

Input Communication Frame

ID0-ID2

Identification Inputs

GPI0-GPI4

General Purpose Inputs

IC

Interface Configuration

RP

Interface Reset

INIT

CPU Reset

CLK

Clock

TBL

Top Block Lock

WP

Write Protect

RFU1

Reserved for Future Use. Leave

disconnected

VCC

Supply Voltage

VPP

Optional Supply Voltage for Fast

Erase Operations

VSS

Ground

NC

Not Connected Internally

Note: 1. Pin 9 in the PLCC32, and Pin 21 in the TSOP40, may also

be driven High or driven Low.

A/A Mux

A/A Mux

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

GPI1

GPI0

WP

TBL

RFU 9

ID2

ID1

ID0

LAD0

1 32

M50LPW040

17

IC (VIL)

NC

NC

VSS

25 VCC

INIT

LFRAME

RFU

RFU

IC (VIH)

NC

NC

VSS

VCC

G

W

RB

DQ7

A/A Mux

Note: Pins 27 and 28 are not internally connected.

A/A Mux

AI05438

3/36

Share Link: