HI George: Thanks for your help.
I find ADC chip is not set into a right mode because only 2 of 4 diff pairs give me right data. So I find the 3 wire control pins are not allocated in the UCF file. I modify the UCF file according to the schematic. But I find I still could not get right data and I could not find right clock from the 3 wire control clock. What I am trying to do is to use chipscope to investigate what's the problem there. I setup the FPGA clock coming from ADC card. So I think my fabric clock should be 1/2 or 1/4 sample rate clock depending on the configuration of ADC chip. Now I provide a 400MHz sample rate clock to the ADC card. The reason I use ADC clock is I want the whole system running in completely synchronization. I have not made sense that what the counter you mentioned is? What's the function? Any idea about my problem? I think, basically, the problem is the ADC chip is not configured correctly. Thanks Wan -----Original Message----- From: David George [mailto:[email protected]] Sent: Monday, 15 June 2009 5:37 PM To: Cheng, Wan (ATNF, Marsfield) Cc: [email protected] Subject: Re: [casper] problem of ADC 1.1 card with Roach Hi Wan > > 1. I could not find the three control wires in the FPGA UCF file. You are quite correct, there was an error recently introduced into the ROACH base ucf, which should now be fixed (r1985). > 2. After I add the three control wires into UCF file, I could not see > the clock output from FPGA. I'm not sure what you mean here, please give more precise and detailed info of what you have and are doing. Do you have the ADC plugged into the ROACH with the sampling rate at four times the fabric rate? Do you have a led flasher application with an LED attached to counter? The ADC clock should always come through, provided there is a external clock plugged into the adc board, regardless of adc configuration status. If you are really stuck try modifying the EDK project to hook a counter directly onto the adc0_clk and attaching an led to the counter MSB. > > Anybody had used the ADC card with Roach? I been using the iADCs with ROACHs for about 7 months. Good luck. Cheers, David -- David George Digital Design Engineer Karoo Array Telescope Tel: +27 21 531-7282 Fax: +27 21 531-9761 Email: [email protected] Web: www.ska.ac.za
