S75WS256NDFBAWMB datasheet(95/216 Pages) SPANSION

95 / 216 page

February 17, 2005 S75WS-N-00_A0

S75WS256Nxx Based MCPs

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Page

Group of words that may be accessed more rapidly as a group than if the words were

accessed individually.

Page Read

Asynchronous read operation of several words in which the first word of the group

takes a longer initial access time and subsequent words in the group take less page

access time to be read. Different words in the group are accessed by changing only the

least significant address lines.

Password Protection

Sector protection method which uses a programmable password, in addition to the

Persistent Protection method, for protection of sectors in the Flash memory device.

Persistent Protection

Sector protection method that uses commands and only the standard core voltage

supply to control protection of sectors in the Flash memory device. This method

replaces a prior technique of requiring a 12V supply to control the protection method.

Program

Stores data into a Flash memory by selectively clearing bits of the memory array in

order to leave a data pattern of ones and zeros.

Program Suspend/Program

Resume

Halts a programming operation to read data from any location that is not selected for

programming or erase.

Read

Host bus cycle that causes the Flash to output data onto the data bus.

Registers

Dynamic storage bits for holding device control information or tracking the status of

an operation.

Secured Silicon

Secured Silicon. An area consisting of 256 bytes in which any word may be

programmed once, and the entire area may be protected once from any future

programming. Information in this area may be programmed at the factory or by the

user. Once programmed and protected there is no way to change the secured

information. This area is often used to store a software readable identification such as

a serial number.

Sector Protection

Use of one or more control bits per sector to indicate whether each sector may be

programmed or erased. If the Protection bit for a sector is set the embedded

algorithms for program or erase ignores program or erase commands related to that

sector.

Sector

An Area of the memory array in which all bits must be erased together by an erase

operation.

Simultaneous Operation

Mode of operation in which a host system may issue a program or erase command to

one bank, that embedded algorithm operation may then proceed while the host

immediately follows the embedded algorithm command with reading from another

bank. Reading may continue concurrently in any bank other than the one executing

the embedded algorithm operation.

Synchronous Operation

Operation that progresses only when a timing signal, known as a clock, transitions

between logic levels (that is, at a clock edge).

VersatileIO™ (VIO)

Separate power supply or voltage reference signal that allows the host system to set

the voltage levels that the device generates at its data outputs and the voltages

tolerated at its data inputs.

Unlock Bypass

Mode that facilitates faster program times by reducing the number of command bus

cycles required to issue a write operation command. In this mode the initial two Unlock

write cycles, of the usual 4 cycle Program command, are not required – reducing all

Program commands to two bus cycles while in this mode.

Word

Two contiguous bytes (16 bits) located at an even byte boundary. A double word is two

contiguous words located on a two word boundary. A quad word is four contiguous

words located on a four word boundary.

Term

Definition

S75WS256NDFBAWMB Datasheet(PDF) 95 Page - SPANSION

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