M58LW128A datasheet(13/65 Pages) STMICROELECTRONICS

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M58LW128A, M58LW128B

is the LSB of the address bus. When WORD is

High, VIH, the Double-Word wide x32 Bus Width is

selected and the data is read and written to on

DQ0-DQ31; A2 is the LSB of the address bus and

A1 is don’t care.

Ready/Busy (RB). The Ready/Busy output, RB,

is an open-drain output that can be used to identify

if the Program/Erase Controller is currently active.

When Ready/Busy is high impedance, the memo-

ry is ready for any read, program or erase opera-

tion. Ready/Busy is Low, VOL, during program and

erase operations. When the device is busy it will

not accept any additional Program or Erase com-

mands except Program/Erase Suspend. When the

Program/Erase Controller is idle, or suspended,

Ready Busy can float High through a pull-up resis-

tor.

The use of an open-drain output allows the Ready/

Busy pins from several memories to be connected

to a single pull-up resistor. A Low will then indicate

that one, or more, of the memories is busy.

Ready/Busy is not Low during a reset unless the

reset was applied when the Program/Erase Con-

troller was active; Ready/Busy can rise before Re-

set/Power-Down rises.

Program/Erase Enable (VPP). The

Program/

Erase Enable input, VPP, is used to protect all

blocks, preventing Program and Erase operations

from affecting their data.

When Program/Erase Enable is Low, VIL, any pro-

gram or erase operation sent to the Command In-

terface will cause the VPP Status bit (bit3) in the

Status Register to be set. When Program/Erase

Enable is High, VIH, program and erase operations

can be performed on unprotected blocks. Pro-

gram/Erase Enable must be kept High during all

Program, Erase, Block Protect and Block Unpro-

tect operations, otherwise the operation is not

guaranteed to succeed and data may become cor-

rupt.

VDD Supply Voltage. The Supply Voltage, VDD,

is the core power supply. All internal circuits draw

their current from the VDD pin, including the Pro-

gram/Erase Controller.

A 0.1

µF capacitor should be connected between

the Supply Voltage, VDD, and the Ground, VSS, to

decouple the current surges from the power sup-

ply. The PCB track widths must be sufficient to

carry the currents required during all operations of

the parts, see Table 16, DC Characteristics, for

maximum current supply requirements.

Input/Output Supply Voltage (VDDQ). The

In-

put/Output Supply Voltage, VDDQ, is the input/out-

put buffer power supply. All input and output pins

and voltage references are powered and mea-

sured relative to the Input/Output Supply Voltage

pin, VDDQ.

The Input/Output Supply Voltage, VDDQ, must al-

ways be equal or less than the VDD Supply Volt-

age, including during Power-Up.

A 0.1

µF capacitor should be connected between

the Input/Output Supply Voltage, VDDQ, and the

Ground, VSSQ, to decouple the current surges

from the power supply. If VDDQ and VDD are con-

nected together then only one decoupling capaci-

tor is required.

Ground (VSS). Ground, VSS, is the reference for

all core power supply voltages.

Ground (VSSQ). Ground, VSSQ, is the reference

for input/output voltage measurements. It is es-

sential to connect VSS and VSSQ to the same

ground.

M58LW128A Datasheet(PDF) 13 Page - STMicroelectronics

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