XC2000 datasheet(89/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-27

V1.0, 2007-06

MemoryX2K, V1.1

The argument “MR” defines the read margin:

•00H: normal read margin.

•01H: hard read 0 margin.

•02H: alternate hard read 0 margin.

•05H: hard read 1 margin.

•06H: alternate hard read 1 margin.

•

Other values: reserved.

For understanding the read margins please refer to “Read Margins” on Page 3-35.

This command must not be issued when the flash memory is in page mode. In this case

it is ignored and a sequence error is reported.

Note: As noted in “Margin Control” on Page 3-60 the command sequences “Program

Page”, “Erase Sector”, “Erase Page” and “Erase Security Page” reset the read

margin back to 00H, i.e. to the normal read margin. The same happens in case of

a flash wake-up.

Enter Page Mode

Arguments: PA

Definition:

MOV XXAAH, XX50H

MOV PA, XXAAH

Timing: 2-cycle command that sets “BUSY” for around 100 clock cycles.

Description: The page mode is entered to prepare a page programming operation on

page address PA. (Write data are accepted only with the “Load Page Word” command.)

With this command, the IMB Core initializes the write pointer of its block assembly

and the read mode are allowed in parallel at the same time and in the same flash module

so the flash module stays readable. When the addressed page PA is read the content of

the flash memory is delivered. The page mode can be aborted and the related PAGE bit

in IMB_FSR be cleared with the “Reset to Read” command. A new “Enter Page Mode”

command during page mode aborts the actual page mode, which is indicated with the

error flag SQER, and restarts a new page operation. So as mentioned above only one

of the flash modules can be in page mode at a time. If one of the erase commands or the

“Change Read Margin” command are received while in page mode it is ignored and a

sequence error is reported.

If write protection is installed for the sector to be programmed, the “Enter Page Mode”

command is only accepted when write protection has before been disabled using the

unlock command sequence “Disable Write Protection” with four passwords. If global

write protection is installed with read protection, also the command “Disable Read

Protection” can be used if no sector specific protection is installed. If write protection is

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