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external memory for dsk

Hi,

I want to test the capability of DSP C54x to control its data bus (D0 to D15). That I can change the state of one bit (e.g. D1) without affecting the others.

 I’m using the ‘C5402 DSK, I try to write my data to external address (e.g @ 8000) and I use the GPIO to visualize the result.  However nothing happens the test passed NOK !!

May I ask if it’s possible or I need something else (for example a buffer (lach) to memorize the state of my data bus) ???