UM1635 datasheet(12/42 Pages) STMICROELECTRONICS

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API specification

UM1635

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DocID024604 Rev 2

Troubleshooting

Comments

When shadowFlag is set to FALSE, 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 TRUE, this function erases the shadow row.

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 C90FL2 module.

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

SPC56ELx:

Bit Allocation for Blocks in Low Address Space:

Table 8. Troubleshooting for FlashErase()

Error Codes

Possible Causes

Solution

C90FL_ERROR_BUSY

New erase operation cannot be

performed because there is

program/erase sequence in

progress on the Flash module.

Wait until all previous program/erase operations on

the Flash module finish.

Possible cases that erase cannot start are:

– erase in progress (FLASH_MCR-ERS is high);

– program in progress (FLASH_MCR-PGM is

high);

C90FL_ERROR_ EGOOD

Erase operation failed.

Check if the C90FL2 is available and high voltage is

applied to C90FL2. Then try to do the erase

operation again.

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

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