M58BW032BT datasheet(23/60 Pages) STMICROELECTRONICS

23 / 60 page

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M58BW032BT, M58BW032BB, M58BW032DT, M58BW032DB

Typical Erase times are given in Table 10.

See Appendix A, Figure 22., Block Erase Flow-

chart and Pseudo Code, for a suggested flowchart

on using the Block Erase command.

Erase All Main Blocks Command

The Erase All Main Blocks command is used to

erase all 63 Main Blocks, without affecting the Pa-

rameter Blocks.

Issuing the Erase All Main Blocks command sets

every bit in each Main Block to '1'. All data previ-

ously stored in the Main Blocks are lost.

Two Bus Write cycles are required to issue the

Erase All Main Blocks command. The first cycle

sets up the command, the second cycle confirms

the command and starts the Program/Erase Con-

troller. If the Confirm Command is not given the

sequence is aborted, and Status Register bits 4

and 5 are set to '1'.

If the address given in the second cycle is located

in a protected block, the Erase All Main Blocks op-

eration aborts. The data remains unchanged in all

blocks and the Status Register outputs the error.

Once the Erase All Main Blocks command has

been issued, subsequent Bus Read operations

output the Status Register. See the STATUS

During an Erase All Main Blocks operation, only

the Read Status Register command is accepted

by the memory; any other command are ignored.

Erase All Main Blocks, once started, cannot be

suspended.

The Erase All Main Blocks command can be exe-

cuted using VDD. If VPEN is at VIH, the operation

will be performed. If VPEN is lower than VIH the op-

eration aborts and the Status Register VPEN bit (bit

3) is set to '1'.

Program Command

The Program command is used to program the

memory array. Two Bus Write operations are re-

quired to issue the command; the first write cycle

sets up the Program command, the second write

cycle latches the address and data to be pro-

grammed and starts the Program/Erase Control-

ler. A program operation can be aborted by writing

FFFFFFFFh to any address after the program set-

up command has been given.

The Program command is also used to program

the OTP block. Refer to Table 8., Commands, for

details of the address.

Once the command is issued subsequent Bus

Read operations read the Status Register. See the

section on the Status Register for details on the

definitions of the Status Register bits. During the

Program operation the memory will only accept

the Read Status Register command and the Pro-

gram/Erase Suspend command. All other com-

mands will be ignored.

If Reset/Power-down, RP, falls to VIL during pro-

gramming the operation will be aborted.

The command can be executed using VDD. If VPEN

is at VIH, the operation can be performed. If VPEN

goes below VIH, the operation aborts, the VPEN

Status bit in the Status Register is set to ‘1’ and the

command must be re-issued.

See Appendix A, Figure 20., Program Flowchart

and Pseudo Code, for a suggested flowchart on

using the Program command.

Write to Buffer and Program Command

The Write to Buffer and Program Command

makes use of the device’s double Word (32 bit)

Write Buffer to speed up programming.

Up to eight Double Words can be loaded into the

Write Buffer and programmed into the memory.

Four successive steps are required to issue the-

command.

One Bus Write operation is required to set up

the Write to Buffer and Program Command.

Any Bus Read operations will start to output

the Status Register after the 1st cycle.

Use one Bus Write operation to write the

selected memory Block Address (any address

in the block where the values will be

programmed can be used) along with the

value N on the Data Inputs/Outputs, where

N+1 is the number of Words to be

programmed. The maximum value of N+1 is 8

Words.

Use N+1 Bus Write operations to load the

address and data for each Word into the Write

Buffer. The address must be between Start

Address and Start Address plus N, where

Start Address is the first word address.

Finally, use one Bus Write operation to issue

the final cycle to confirm the command and

start the Program operation.

If any address is outside the block boundaries or if

the correct sequence is not followed, Status Reg-

ister bits 4 and 5 are set to ‘1’ and the operation will

abort without affecting the data in the memory ar-

ray. A protected block must be unprotected using

the Blocks Unprotect command.

During a Write to Buffer and Program operation

the memory will only accept the Read Status Reg-

ister and the Program/Erase Suspend commands.

All other commands are ignored. The Write to

Buffer and Program command can be executed

using VDD. If VPEN is at VIH, the operation will be

performed. If VPEN is lower than VIH the operation

aborts and the Status Register VPEN bit (bit 3) is

set to '1'.

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