Xintf bus in TMS320f2812

Anandarup Das said:

Hi,

I am working with a TMS20f2812 dsp board, which has a DAC connected to XINTF bus. I want to see some variable in the DSP code via this DAC output in an oscilloscope. How is it possible to put these signals on the XINTF bus? These are non critical signals, and used for debugging purpose. Can I use a UOUT command? What is the address of XD register for putting the signal?

Thanks for the help,

Anandarup Das

The XINTF on 281x if you take a look at the memory map in the data manual you will find sections of memory that are associated with XINTF.  Each of these is called an XINTF zone.  Any write or read to these memory locations will automatically go through the external interface.

www.ti.com/lit/SPRS174, section 3.1 Memory Map

If you perform a read to zone 0, for example - the chip select for zone 0 will go active and the respective data/address lines will as well.

Section 1 in the XINTF reference guide for 281x (www.ti.com/lit/SPRU067) goes through the signals in more detail and how to access a zone.

You may also find this wiki page helpful:

http://processors.wiki.ti.com/index.php/External_Interface_XINTF_Type_0_FAQ_for_C2000

Best Regards,

Lori