M58BW16F datasheet(13/81 Pages) STMICROELECTRONICS

13 / 81 page

M58BW16F, M58BW32F

Description

13/81

1.1

Block Protection

The M58BWxxF features four different levels of block protection.

●

Write Protect Pin, WP, - When WP is Low, VIL, the protection status that has been

configured in the Block Protection Configuration Register is activated. The Block

Protection Configuration Register is volatile. Any combination of blocks is possible. Any

attempt to program or erase a protected block will return an error in the Status Register

(see Table 13: Status Register Bits).

●

Reset/Power-Down Pin, RP, - If the device is held in reset mode (RP at VIL), no

program or erase operation can be performed on any block.

●

Program/Erase Enable, PEN, - The Program/Erase Enable input, PEN, protects all

blocks by preventing Program and Erase operations from modifying the data.

Prior to issuing a Program or Erase command, the Program/Erase Enable must be set

to High (VIH). If it is Low (VIL), the Program or Erase operation is not accepted and an

error is generated in the Status Register.

●

Permanent protection against Modify operations - specific OTP-like blocks can be

permanently protected against Modify operations (program/ erase):

–

in the M58BW32F, a unique 128-Kbit parameter block – Block 1 (01000h-01FFFh)

for bottom devices or Block 72 (FE000h-FEFFFh) for Top devices

–

in the M58BW16F, two 64-Kbit parameter blocks – Blocks 2 & 3 (01000h-01FFFh)

for bottom devices or Blocks 36 & 35 (7E000h-7EFFFh) for top devices

This protection is user-enabled. Details of how this protection is activated are provided

in a dedicated application note.

After a device reset the first two kinds of block protection (WP, RP) can be combined to give

a flexible block protection. All blocks are protected at power-up.

M58BW16F Datasheet(PDF) 13 Page - STMicroelectronics