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M28W320BB

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M28W320BT, M28W320BB

SUMMARY DESCRIPTION

The M28W320B is a 32 Mbit (2 Mbit x 16) non-vol-

atile Flash memory that can be erased electrically

at the block level and programmed in-system on a

Word-by-Word basis. These operations can be

performed using a single low voltage (2.7 to 3.6V)

supply. VDDQ allows to drive the I/O pin down to

1.65V. An optional 12V VPP power supply is pro-

vided to speed up customer programming.

The device features an asymmetrical blocked ar-

chitecture. The M28W320B has an array of 71

blocks: 8 Parameter Blocks of 4 KWord and 63

Main Blocks of 32 KWord. M28W320BT has the

Parameter Blocks at the top of the memory ad-

dress space while the M28W320BB locates the

Parameter Blocks starting from the bottom. The

memory maps are shown in Figure 5, Block Ad-

dresses.

Parameter blocks 0 and 1 can be protected from

accidental programming or erasure. Each block

can be erased separately. Erase can be suspend-

ed in order to perform either read or program in

any other block and then resumed. Program can

be suspended to read data in any other block and

then resumed. Each block can be programmed

and erased over 100,000 cycles.

Program and Erase commands are written to the

Command Interface of the memory. An on-chip

Program/Erase Controller takes care of the tim-

ings necessary for program and erase operations.

The end of a program or erase operation can be

detected and any error conditions identified. The

command set required to control the memory is

consistent with JEDEC standards.

The memory is offered in TSOP48 (10 X 20mm),

and TFBGA47 (6.39 x 10.5mm, 0.75mm pitch)

packages and is supplied with all the bits erased

(set to ’1’).

Figure 2. Logic Diagram

VDD VDDQ VPP

21

A0-A20

W

E

G

RP

WP

16

DQ0-DQ15

M28W320BT

M28W320BB

VSS

AI03822

Table 1. Signal Names

A0-A20

Address Inputs

DQ0-DQ15 Data Input/Output

E

Chip Enable

G

Output Enable

W

Write Enable

RP

Reset

WP

Write Protect

VDD

Core Power Supply

VDDQ

Power Supply for

Input/Output

VPP

Optional Supply Voltage for

Fast Program & Erase

VSS

Ground

5/43

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