UM1620 datasheet(13/41 Pages) STMICROELECTRONICS

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UM1620

API specification

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

SPC564A70:

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

the shadow row are not erased, but ‘FlashErase()’ still returns C90FL_OK. User needs to

check the erasing result with the ‘BlankCheck()’ function.

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

is already in progress on C90FL module. ‘FlashErase()’ returns C90FL_ERROR_BUSY

when trying to do so. Similarly, once an erasing operation has started on C90FL module, it is

impossible to run another program or erase operation.

In addition, when ‘FlashErase()’ is running, it is unsafe to read the data from the Flash

module having one or more blocks being erased. Otherwise, it causes a Read-While-Write

error.

Assumptions

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

correct ssdconfig parameters to FlashErase() as returned by FlashInit().

2.6.3

BlankCheck()

Description

This function checks on the specified Flash range in the main array or shadow row for blank

state. If the blank checking fails, the first failing address and the failing data in Flash block

are saved.

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

Table 11. Bit allocation for blocks in high address space

MSB

LSB

bit 31

…

bit 6

bit 5

bit 4

…

bit 1

bit 0

reserved

…

reserved

block 5

block 4

…

Block 1

Block 0

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