topic Re: Differences between SDM and LDM in CW10.7 for target 56F8xxx in Digital Signal Controllers

Differences between SDM and LDM in CW10.7 for target 56F8xxx

guenter_loettrich — Mon, 04 Sep 2017 09:38:53 GMT

Dear all,

is there a document available which explains the differences between memory models SDM and LDM?

It's for target 56F8xxxx.

When increasing the size of code in SDM >64KB then errors show up during build time of the project. (see attachment)

Is it necessary to switch to LDM mode if code size is bigger than 64KB?

Guenter

Re: Differences between SDM and LDM in CW10.7 for target 56F8xxx

xiangjun_rong — Tue, 05 Sep 2017 06:31:24 GMT

Hi, Guenter,

I think we have not the documentation to address the LDM/SDM subject. In SDM mode, the code size is limited to 64K words, and data size is limited to 64K words, the pointer of data structure in C language is 16 bits. In LDM mode, the code size should be limited to 2**(21) or 2M words, the data size is limited to 2**(23) or 8M words.

Hope it can help you

Xiangjun Rong