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Aboutu PSD3354 SRAM and Second Flashrom map address overlap

zues
Associate II
Posted on October 31, 2005 at 05:29

Aboutu PSD3354 SRAM and Second Flashrom map address overlap

2 REPLIES 2
zues
Associate II
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
Associate II
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.