MX25L6445E datasheet(33/72 Pages) MCNIX

33 / 72 page

MX25L6445E

P/N: PM1736

REV. 1.8, DEC. 26, 2011

Block Lock Flow

RDSCUR(2Bh) command

Start

WREN command

SBLK command

( 36h + 24bit address )

RDSR command

RDBLOCK command

( 3Ch + 24bit address )

Block lock successfully

Yes

Block lock fail

Data = FFh ?

WIP=0?

Lock another block?

Block lock completed

Yes

WPSEL=1?

WPSEL command

(28) Single Block Lock/Unlock Protection (SBLK/SBULK)

These instructions are only effective after WPSEL was executed. The SBLK instruction is for write protection a spec-

ified block(or sector) of memory, using A23-A16 or (A23-A12) address bits to assign a 64Kbyte block (or 4K bytes

sector) to be protected as read only. The SBULK instruction will cancel the block (or sector) write protection state.

This feature allows user to stop protecting the entire block (or sector) through the chip unprotect command (GBULK).

The WREN (Write Enable) instruction is required before issuing SBLK/SBULK instruction.

The sequence of issuing SBLK/SBULK instruction is: CS# goes low → send SBLK/SBULK (36h/39h) instruction →

send 3 address bytes assign one block (or sector) to be protected on SI pin → CS# goes high. (Please refer to Fig-

ure 36)

The CS# must go high exactly at the byte boundary, otherwise the instruction will be rejected and not be executed.

SBLK/SBULK instruction function flow is as follows:

MX25L6445E Scheda tecnica(PDF) 33 Page - Macronix International