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UM1618

API specification

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Following table defines and describes various blkLockIndicator values.

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

status of the specified address space. A main array block 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/Large 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 are always 1 because such blocks are locked by hardware on reset. These blocks

cannot be unlocked by software with ‘SetLock’ function.

If user uses the alternate interface to get the lock protection for the Large address space,

the error code C55_ERROR_ALTERNATE is returned to indicate that the interface does not

support this operation.

The bit allocations for blocks in one address space are: the least significant bit is

corresponding to 16K block region and start with block 0 (if available), then 32K block region

(if available) then lastly 64K block region (if available) and lastly 8K block region (if

available).

The Large block space is divided into two separate sections corresponding two different

block lock indicators. The C55_BLOCK_LARGE_FIRST lock indicator represents the first

32 blocks (from bit 0 to bit 31) of Large block space (128K/256K) and the C55_BLOCK_

LARGE_SECOND lock indicator represents the second 32 blocks (from bit 32 to upper bits)

of Large block space (128K/256K).

Below is example for the formats of blkLockState in the C55 Flash module according to

specific address space. In particular, this is an example with two blocks for each block size

in low, middle or high address space and 48 blocks for Large block (128K/256K) address

space. The invalid blocks are marked as reserved. And the number of valid bits may be

various according to specific Flash module.

Table 46. Lock indicator definitions

Code Name

Value

Description

C55_BLOCK_LOW

Block lock protection of low address space.

C55_BLOCK_MID

Block lock protection of mid address space.

C55_BLOCK_HIGH

Block lock protection of high address space.

C55_BLOCK_LARGE_FIRST

Block lock protection of the first Large address

space (from block 0 to block 31).

C55_BLOCK_LARGE_SECOND

Block lock protection of the second Large address

space (from block 32 to upper block numbering).

C55_BLOCK_UTEST

Block lock protection of the UTest block.

Table 47. blkLockState in low address space

MSB

LSB

bit 31

…

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

reserved

…

64K block 1 64K block 0 32K block 1 32K block 0 16K block 1 16K block 0

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