EM6819 datasheet(35/154 Pages) EMMICRO

35 / 154 page

EM6819

07 /09 – rev.D

www.emmicroelectronic.com

4.4.3

ERASE

Erase is a mandatory step before write. The NVM erase state is high, write state low.

Only Row erase or sector erase are allowed, below table summaries the available API routines

sub-routines

Description

Duration

erase_sector_apl

Erase the selected sector [4:0].

Erase sector 5 is denied.

2 ms

erase_sector_slow_apl

Erase the selected sector [4:0] in slow mode.

Erase sector 5 is denied.

3 ms

erase_row_apl

Erase the selected row [63:0] in the selected

sector [5:0].

Erase row 63 & 62 in sector 5 is denied.

2 ms

erase_row_slow_apl

Erase the selected row [63:0] in the selected

sector [5:0] in slow mode.

Erase row 63 & 62 in sector 5 is denied.

3 ms

Accessing above routines will use the sector and row pointers as defined in RegCacheCfg2,1

4.4.4

WRITE

Before writing a specific row, the RAM cache needs to get the new data, the sector and row pointers need to be set

according to the desired NVM location, and once everything setup, the CPU may call one of the below listed API

subroutines to write the NVM row. Write access is row by row only.

Write_row_x API routines include also the erase row. It is therefore not necessary to erase the row before.

Write_only_x routines do not include the erase. These routines may only be used if the addressed row was erased

earlier.

sub-routines

Description

Duration

write_row_apl

Erase and write the selected row [63:0] in the

selected sector [5:0].

Access row 63 & 62 in sector 5 is denied.

3 ms

write_row_slow_apl

Erase and write the selected row [63:0] in the

selected sector [5:0] in slow mode.

Access row 63 & 62 in sector 5 is denied.

4.5 ms

write_only_apl

Only write the selected row [63:0] in the selected

sector [5:0].

Write row 63 & 62 in sector 5 is denied.

1 ms

write_only_slow_apl

Only write the selected row [63:0] in the selected

sector [5:0] in slow mode.

Write row 63 & 62 in sector 5 is denied.

1.5 ms

Note:

It is not allowed to re-write more a given row without prior erase

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