UM1634 datasheet(27/43 Pages) STMICROELECTRONICS

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UM1634

API specification

For Shadow/Low/Mid address spaces, there are two block lock levels. The secondary level

of block locking provides an alternative means to protect blocks from being modified. A

logical “OR” of the corresponding bits in the primary and secondary lock registers for a block

determines the final lock status for that block. For high address space there is only one

block lock level.

The output parameter blkLockState returns a bit-mapped value indicating the block lock

status of the specified locking level and address space. A main array block or shadow row is

locked from program/erase if its corresponding bit is set.

The indicated address space determines the valid bits of blkLockState. For either

Low/Mid/High address spaces, if blocks corresponding to valid block lock state bits are not

present (due to configuration or total memory size), values for these block lock state bits will

be always 1 because such blocks are locked by hardware on reset. These blocks cannot be

unlocked by software with 'SetLock()' function.

The following diagrams show the block bitmap definitions of blkLockState for

shadow/Low/Mid/High address spaces.

LOCK_MID_PRIMARY

Primary block lock protection of mid address space

LOCK_MID_SECONDARY

Secondary block lock protection of mid address space

LOCK_HIGH

Block lock protection of high address space

Table 31. blkLockState bit allocation for shadow address space

MSB

LSB

bit 31

…

bit 1

bit 0

reserved

…

reserved

shadow row

Table 32. blkLockState bit allocation for low address space

MSB

LSB

bit 31

…

bit 10

bit 9

bit 8

…

bit 1

bit 0

reserved

…

reserved

block 9

block 8

…

block 1

block 0

Table 33. blkLockState bit allocation for mid address space

MSB

LSB

bit 31

…

bit 4

bit 3

bit 2

bit 1

bit 0

reserved

…

reserved

block 1

block 0

Table 30. blkLockIndicator definitions (continued)

Code Name

Value

Description

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