M58BW16F datasheet(37/81 Pages) STMICROELECTRONICS

37 / 81 page

M58BW16F, M58BW32F

Command interface

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4.12

Set Burst Configuration Register command

The Set Burst Configuration Register command is used to write a new value to the Burst

Configuration Register which defines the burst length, type, X and Y latencies,

Synchronous/Asynchronous Read mode.

Two Bus Write cycles are required to issue the Set Burst Configuration Register command.

The first cycle writes the setup command. The second cycle writes the address where the

new Burst Configuration Register content is to be written, and confirms the command. If the

command is not confirmed, the sequence is aborted and the device outputs the Status

Read mode as if a Read Memory Array command had been issued.

The value for the Burst Configuration Register is always presented on A0-A15. M0 is on A0,

M1 on A1, etc.; the other address bits are ignored.

4.13

Set Block Protection Configuration Register command

The Set Block Protection Configuration Register command is used to configure the Block

Protection Configuration Register to ‘Protected’, for a specific block. Protected blocks are

fully protected from program or erase when WP pin is Low, VIL. The status of a protected

block can be changed to ‘Unprotected’ by using the Clear Block Protection Configuration

Two bus operations are required to issue a Set Block Protection Configuration Register

command:

●

The first cycle writes the setup command

●

The second write cycle specifies the address of the block to protect and confirms the

command. If the command is not confirmed, the sequence is aborted and the device

outputs the Status Register with bits 4 and 5 set to ‘1’.

To protect multiple blocks, the Set Block Protection Configuration Register command must

be repeated for each block.

Any attempt to re-protect a block already protected does not change its status.

4.14

Clear Block Protection Configuration Register command

The Clear Block Protection Configuration Register command is used to configure the Block

Protection Configuration Register to ‘Unprotected’, for a specific block thus allowing

program/erase operations to this block, regardless of the WP pin status.

Two bus operations are required to issue a Clear Block Protection Configuration Register

command:

●

The first cycle writes the setup command

●

The second write cycle specifies the address of the block to unprotect and confirms the

command. If the command is not confirmed, the sequence is aborted and the device

outputs the Status Register with bits 4 and 5 set to ‘1’.

To unprotect multiple blocks, the Clear Block Protection Configuration Register command

must be repeated for each block.

Any attempt to unprotect a block already unprotected does not affect its status.

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