M58LW064 datasheet(22/53 Pages) STMICROELECTRONICS

22 / 53 page

M58LW064A, M58LW064B

22/53

Block Unprotect Instruction (BU). The

Block

Unprotect Instruction BU uses a two-cycle write

sequence. All the Block Protect bits are simulta-

neously erased. The Block Protect bit register is

erased by giving the command 60h and then the

Confirm command D0h, at any address location.

The sequence is aborted if the Confirm command

is not given and the device will output the Status

Block Erase Instruction (EE). The Block Erase

Instruction EE uses a two-cycle command se-

quence. The Erase Setup command 20h is written

to any address location. Then a second write cycle

is given with the block address to be erased and

the Confirm command D0h. The sequence is

aborted if the Confirm command is not given and

the device will output the Status Register Data with

DQ4 and DQ5 set to ’1’.

During the execution of the erase cycle by the P/

E.C., the memory accepts only the Erase/Program

Suspend instructions. Read operations output the

Status Register bits. A complete state of the erase

operation is given by the Status Register bits.

Erase/Program Suspend Instruction (PES).

The Block Erase or Write to Buffer and Program

operations may be suspended by writing the com-

mand B0h at any address. The Erase/Program

Suspend Instruction interrupts the P/E.C. Erase or

Program sequence at a predetermined point in the

algorithm. After the Suspend command is written

the device outputs the Status Register data.

It is possible to read or program data in a block

other than the one in which the Erase Suspend op-

eration is effective. It is only possible to read in a

block other than the one in which a Program Sus-

pend operation is effective. The suspended Erase/

Program operation has to be resumed in order to

complete the previous erase/program sequence.

The Erase Suspend instruction is accepted only

during a Block Erase operation execution. Pro-

gram Suspend also is valid only during the Write to

Buffer and Program instruction execution. Block

Erase or Erase/Program Suspend instructions are

ignored if the memory is already in the Suspend

mode.

The Suspend Instruction may be presented at any

time during the execution of a Block Erase. For a

Write to Buffer and Program instruction the Sus-

pend Instruction is accepted only when the P/E.C.

is running.

The device outputs information about the suspend

in the Status Register information on DQ7, DQ6

and DQ2. If the operation has been completed

DQ7 = ’1’ and DQ6 = ’0’ (Erase Suspend) or

DQ2 = ’0’ (Program Suspend).

If the Suspend instruction occurred after the P/

E.C. has completed its operation (DQ7 = 1,

DQ6 = 0 and DQ2 = 0), the Status Register infor-

mation remains available by toggling Output En-

able G. No command is accepted by the device

with the exception of a Read Memory Array In-

struction FFh. After the FFh Command is issued,

the device is ready for Read Array (in the mode

defined by the last Set Configuration Register is-

sued).

When a program operation is completed inside a

Block Erase Suspend Instruction, Read Array In-

struction FFh will reset the device to Read Array.

The Erase Resume Instruction has to be issued to

complete the whole sequence.

When erase is suspended, the memory will re-

spond only to the Read Array, Read Electronic

Signature, Read Query, Read Status Register,

Clear Status Register, Erase/Program Resume

and the Write to Buffer and Program instructions.

When a Write to Buffer and Program instruction is

suspended, the memory will respond only to the

Read Array, Read Electronic Signature, Read

Query, Read Status Register, Clear Status Regis-

ter and Erase/Program Resume instructions.

Erase/Program Resume Instruction (PER). If

an Erase Suspend instruction was previously exe-

cuted, the erase operation may be resumed by

giving the command D0h, at any address. This

also serves as the Confirm command for the Write

to Buffer and Program (WPBR) Instruction which

is issued after the write buffer loading sequence is

completed, and which starts the P/E.C.

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