UM1634 datasheet(35/43 Pages) STMICROELECTRONICS

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UM1634

API specification

Return values

Comments

The API supports single bit correction and double bit error detection in 72-bit codeword

including 8 ECC bits. Depending on the errBits and errECCBits values, a single or double bit

faults is simulated. When a Flash read is done, if the simulated error has not occurred, then

the API returns the error code C90FL_ERROR_ECC_LOGIC. For more than two bit faults

detection, the behavior

is indeterministic. Thus, this API will not check for this case and shall return error code

C90FL_ERROR_ECC_NOTCHECK.

The read buffer in flash platform controller must be disabled before simulating for single bit

correction and double bit detection. For double bit detection, the ECC error exception

handler needs to be set up properly as well.

Assumptions

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

3.7.3

FactoryMarginReadCheck()

Description

This function checks the Factory Margin reads of the Flash. The user specified margin level

is used for reads and the operation is done on the specified blocks. The MISR values

calculated by the hardware is compared to the values passed by the user, if they are not the

same, then an error code is returned.

Prototype

UINT32 FactoryMarginReadCheck (PSSD_CONFIG pSSDConfig,

UINT32 lowEnabledBlocks,

UINT32 midEnabledBlocks,

UINT32 highEnabledBlocks,

UINT8 marginLevel,

MISR misrValue_Bk0,

MISR misrValue_Bk1,

void (*CallBack)(void));

Table 45. Return values for FlashECCLogicCheck()

Return Values

Possible Causes

Solution

C90FL_ERROR_ECC_LOGIC

The ECC value calculated

by the user is incorrect.

Re-calculate the ECC values

using the correct Data.

Hardware is failure

Hardware Error.

C90FL_ERROR_ECC_NOTCHECK

There are more than two bit

faults simulated.

This API supports to check

single bit fault correction or

double bit fault detection only.

C90FL_OK

Successful completion

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