UM1618 datasheet(24/51 Pages) STMICROELECTRONICS

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API specification

UM1618

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DocID024371 Rev 3

Troubleshooting

Comments

The contents pointed by pFailedAddress, pFailedData and pFailedSource are updated only

when there is a mismatch between the source and destination regions.

If user wants to do program verify for large size, this Flash size is divided into many small

portions defined by NUM_WORDS_PROGRAM_VERIFY_CYCLE such that verification for

one small portion can be finished within expected time interval. In this case, ‘ProgramVerify’

function plays a role to kick-off this verification operation by finishing verification for the first

portion after back-up all necessary information to pCtxData variable. And verification from

the second portion is done within ‘FlashCheckStatus’ function. Thus, user must call

‘FlashCheckStatus’ to finish all his expected operations defined by size argument.

Assumptions

It assumes that the Flash block is initialized using a ‘FlashInit’ API.

2.7.7

CheckSum

Description

This function performs a 32-bit sum over the specified Flash memory range without carry,

which provides a rapid method for data integrity checking.

This function only does Flash check sum for given number of bytes which can terminate this

function within expected time interval. Thus, if user wants to do check sum for large size, the

rest of information need to be checked sum is stored in “pCtxData” variable and

‘FlashCheckStatus’ must be called periodically to do the next check sum for next destination

based on all data provided in “pCtxData”.

Prototype

UINT32 CheckSum (PSSD_CONFIG pSSDConfig,

UINT32 dest,

UINT32 size,

UINT32 *pSum,

PCONTEXT_DATA pCtxData);

Table 29. Troubleshooting for ProgramVerify

Returned Error Bits

Description

Solution

C55_ERROR_ALIGNMENT

This error indicates that

dest/size/source isn’t

properly aligned.

Check if dest , size and source are

aligned on word (32-bit) boundary.

C55_ERROR_VERIFY

There is a mismatch

between destination and

source data.

Check if the data in source is correct. If

yes, the previous program operation is

failed. User should re-erase that Flash

location and do program again.

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