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White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

White Electronic Designs

W764M32V-XSBX

March 2006

Rev. 2

ADVANCED*

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

GENERAL DESCRIPTION

The W764MB2V-XSBX device is a 3.0V single power

flash memory. The device utilizes four organized as

33,554,432 words or 67, 108,864 bytes. The device has

64 -bit wide data bus that can also function as an 32-bit

wide data bus by using the BYTE# input. The device can

be programmed either in the host system or in standard

EPROM programmers.

Each device requires a single 3.0 volt power supply for

high-voltage accelerated program (WP / ACC) input provides

shorter programming times through increased current. This

feature is intended to facilitate factory throughput during

system production, but may also be used in the field if

desired.

The devices are entirely command set compatible with the

JEDEC single power-supply Flash standard. Commands

are written to the device using standard microprocessor write

timing. Write cycles also internally latch addresses and data

needed for the programming and erase operations.

The sector erase architecture allows memory sectors to

be erased and reprogrammed without affecting the data

contents of other sectors. The device is fully erased when

shipped from the factory.

Device programming and erasure are initiated through

command sequences. Once a program or erase operation

has begun, the host system need only poll the DQ7 (Data#

Polling) or DQ6 (toggle) status bits or monitor the Ready /

Busy# (RY / BY#) output to determine whether the operation

is complete. To facilitate programming, an Unlock Bypass

mode reduces command sequence over head by requiring

only two write cycles to program data instead of four.

voltage levels that the device generates and tolerates on

all input levels (address, chip control, and DQ input levels)

This allows the device to operate in a 1.8 V or 3 V system

environment as required.

detector that automatically inhibits write operations during

power transitions. Persistent Sector Protection provides

in-system, comand-enabled protection of any combination

Sector Protection prevents unauthorized write and erase

operations in any combination of sectors through a user-

defined 64-bit password.

The erase Suspend / Erase Resume feature allows the host

system to pause and erase operation in a given sector to

read or program any other sector and then complete the

erase operation. The Program Suspend / Program Resume

feature enables the host system to pause the program

operation in a given sector to read any other sector and

then complete the program operation.

The hardware RESET# pin terminates any operation in

progress and resets the device, after which it is then ready

for a new operation. The RESET# pin may be tied to the

system reset circuitry. A system reset would thus also

reset the device, enabling the host system to read boot-up

firmware from the Flash memory device.

The device reduces power consumption in the standby

mode when it detects specific voltage levels on CS# and

RESET#, or when addresses have been stable for a

specified period of time.

The Secured Silicon Sector provides a 128-work/256-byte

area for code or data that can be permanently protected.

Once this sector is protected, no further changes within the

sector can occur.

The Write Protect (WP# / ACC) feature protects the first or

last sector by asserting a logic low on the WP# pin.