Stratix II ES180 board, help me with DAC output

Dear Daixiwen

I found the problems...I dont know... the problem is...no problem. I did

simple code... just output 14bit of 0 and 14bit of 1 following the frequency of input clock. the signal output

in the stratix II board is changed with the frequency of input sequence.

However, in the Stratix I (I test the code in two kinds of Stratix

board), I can easily observe the output signal on oscilloscope in the

same condition. But in the Stratix II board, I cant see any signal like

in the stratix I board...

Anyway, I knew what I am wrong. I learned a lot from forum and from you.

thank you a gain