UM1620 datasheet(25/41 Pages) STMICROELECTRONICS

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UM1620

API specification

Comments

Following table defines and describes various blkLockIndicator values.

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. The following

diagrams show the block bitmap definitions of blkLockState for shadow/Low/Mid/High

address spaces.

For low address space valid bits are from bit 0 to bit (lowBlockNum – 1). In which,

lowBlockNum is the number of low blocks returned from FlashInit();

For middle address space valid bits are from bit 0 and bit (midBlockNum – 1). In which,

midBlockNum is the number of middle blocks returned from FlashInit();

For high address space valid bits are from bit 0 to bit (highBlockNum – 1). In which,

highBlockNum is the number of high blocks returned from FlashInit();

For shadow row valid bit is bit 0;

For example, below are bit allocations for blocks in Low/Mid/High Address Space of

SPC564A70:

Table 34. blkLockIndicator definitions

Code Name

Value

Description

LOCK_SHADOW_PRIMARY

Primary block lock protection of shadow address space

LOCK_SHADOW_SECONDARY

Secondary block lock protection of shadow address

space

LOCK_LOW_PRIMARY

Primary block lock protection of low address space

LOCK_LOW_SECONDARY

Secondary block lock protection of low address space

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 35. blkLockState bit allocation for shadow address space

MSB

LSB

bit 31

…

bit 1

bit 0

reserved

…

reserved

shadow row

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