UM1634 datasheet(14/43 Pages) STMICROELECTRONICS

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API specification

UM1634

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DocID024601 Rev 3

Return values

Comments

When shadowFlag is set to 0x00, the ‘FlashErase()’ function erases the blocks in the main

array. It is capable of erasing any combination of blocks in the low, mid and high address

spaces in one operation. If shadowFlag is 0x01, 0x02 or 0x03, this function erases the

shadow row of Bank0, Bank1 and Bank0 and Bank1 together respectively. User has to

make sure that security word is programmed back after erasing the shadow rows to protect

the part from getting censored.

The inputs lowEnabledBlocks, midEnabledBlocks and highEnabledBlocks are bit-mapped

arguments that are used to select the blocks to be erased in the Low/Mid/High address

spaces of main array. The selection of the blocks of the main array is determined by

setting/clearing the corresponding bit in lowEnabledBlocks, midEnabledBlocks or

highEnabledBlocks.

The bit allocations for blocks in one address space are: bit 0 is assigned to block 0, bit 1 to

block 1, etc. The following diagrams show the formats of lowEnabledBlocks,

midEnabledBlocks and highEnabledBlocks for the C90FL module.

For low address space valid bits are from bit 0 to bit 9; For middle address space valid bits

are bit 0 and bit 1; For high address space valid bits are from bit 0 to bit 5.

Table 8. Return values for FlashErase()

Return Values

Possible Causes

Solution

C90FL_ERROR_B

USY

New erase operation cannot be

performed because there is

program/erase sequence in

progress on the same flash module.

Wait until all previous program/erase

operations on this flash module to finish.

Possible cases that erase cannot start

are:

1. erase in progress (MCR-ERS is high);

2. program in progress (MCR-PGM is

high);

C90FL_ERROR_

EGOOD

Erase operation failed

Check if the voltage supplied is sufficient.

Then try to do the erase operation again

C90FL_OK

Successful completion

Table 9. Bit allocation for blocks in 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 10. Bit allocation for blocks in middle address space

MSB

LSB

bit 31

…

bit 4

bit 3

bit 2

bit 1

bit 0

reserved

…

reserved

block 1

block 0

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