UM1635 datasheet(16/42 Pages) STMICROELECTRONICS

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API specification

UM1635

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Return values

Troubleshooting

Comments

If the selected main array blocks or the shadow row is locked for programming, those blocks

or the shadow row are not programmed and ‘FlashProgram()’ still returns C90FL_OK. User

needs to verify the programmed data with ‘ProgramVerify()’ function.

It is impossible to program any Flash block or shadow row when a program or erase

operation is already in progress on C90FL2 module. ‘FlashProgram()’ returns

C90FL_ERROR_BUSY when doing so. However, user can use the ‘FlashSuspend()’

function to suspend an on-going erase operation on one block to perform a program

operation on another block. The user has begun an erase operation on the main array or

shadow row, it may be suspended to program on both main array and shadow row.

It is unsafe to read the data from the Flash partitions having one or more blocks being

programmed when ‘FlashProgram()’ is running. Otherwise, it causes a Read-While-Write

error.

Table 16. Return values for FlashProgram()

Type

Description

Possible values

UINT32

Successful completion or error value.

C90FL_OK

C90FL_ERROR_BUSY

C90FL_ERROR_ALIGNMENT

C90FL_ERROR_RANGE

C90FL_ERROR_PGOOD

Table 17. Troubleshooting for FlashProgram()

Returned error bits

Description

Solution

C90FL_ERROR_BUSY

New program operation cannot

be performed because the

Flash module is busy with

some operation and cannot

meet the condition for starting a

program operation.

Wait until the current operations finish.

Conditions that program cannot start are:

1. program in progress (MCR-PGM high);

2. program not in progress (MCR-PGM low), but:

– erase on main array in progress but not

suspended;

– erase on shadow row is in progress but not

suspended;

C90FL_ERROR_ALIGNMENT

This error indicates that

dest/size/source isn’t properly

aligned

Check if dest and size are aligned on double

word (64-bit) boundary. Check if source is aligned

on word boundary.

C90FL_ERROR_RANGE

The area specified by dest and

size is out of the valid C90FL2

address range.

Check dest and dest+size. Both should fall in the

same C90FL2 address ranges, i.e. both in main

array or both in shadow row

C90FL_ERROR_PGOOD

Program operation failed

because this operation cannot

pass PEG check.

Repeat the program operation. Check if the

C90FL2 is invalid or high voltage applied to

C90FL2 is unsuitable.

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