Aboutu PSD3354 SRAM and Second Flashrom map address overlap

[zues]

Posted on October 31, 2005 at 05:29

Aboutu PSD3354 SRAM and Second Flashrom map address overlap

[zues]

Posted on May 17, 2011 at 12:08

Dear All:

memory map :

0000--7FFF ----->RAM and csiop

0000--7FFF ----->second flashrom csboot0~3

if following this code(in the main flasherom) --->

''*((volatile unsigned char xdata *)(0x6000))=0x34''

it access SRAM or Second flahrom?

if this code access SRAM,how can access second flashrom(if use VM and VM value set what)?

Best Regard!

Zues

[sunsy]

Posted on May 17, 2011 at 12:08

Before firstly, you must make sure wether the SRAM/CSIOP and CSBOOT is in data space or not?

the sentence you write was access the XDATA in the data space.

if your SRAM/CSIOP and CSBOOT are both in data space, then their address is overlapped. you can only access the SRAM/CSIOP instaed the CSBOOT, in other words, the CSBOOT is transparent, never be accessed.