Re: [casper] fitting large numbers into the 10 Gbe
Thanks Mark, The packetizer does look like it is what I need. Is there any documentation on it? I couldn't find any and all I get out of the packetizer is a high overflow for the duration of what is supposed to be the data out period. Or maybe I am not getting all my data in properly? Since I have a 1024 point FFT, each vector is 512 (even, odd). Then the result of all the cross-correlations, power, and power^2 calculations is a 768 bit by 512 channel data set that I want to fit into the 10 Gbe 64 bits at a time. A scope shows that I get nothing coming out of the packetizer's data port, and only a high overflow signal after every data input. thanks, Sam On Thu, Aug 4, 2011 at 6:40 PM, Mark Wagner mwag...@ssl.berkeley.edu wrote: Hi Sam, The packetizer block in the CASPER library buffers up data from a vector accumulator and can send it out in bursts to the 10GbE block with the appropriate data valid. It sounds like this may be what you need. Mark On Thu, Aug 4, 2011 at 2:55 PM, Samuel Tun samuel@gmail.com wrote: Hello, I'm wondering if anyone has any examples or suggestions on how to get large numbers coming out of vector accumulators into the 10 Gbe block. This block takes 64 bits at a time, so I've tried to slice up whatever comes out fo the vacc into 64 bit slices, delaying subsequent ones so that mux selections lets me capture an entire spectral channel as it comes out of vacc. However, cycling through the mux means I miss all the channels in between count starts. Regardless, I may be going about it the wrong way, so any examples would be greatly appreciated. The ones I've seen concatenate up to 64 bits, so do not have this problem. If anyone wants to take a look, this is intended for getting out the data of a 3 antenna 500 MHz bandwidth correlator for the FASR Subsytem Testbed, FST. http://dl.dropbox.com/u/3531421/test1ghz10Gbe.mdl Thanks, Sam Tun
[casper] fitting large numbers into the 10 Gbe
Hello, I'm wondering if anyone has any examples or suggestions on how to get large numbers coming out of vector accumulators into the 10 Gbe block. This block takes 64 bits at a time, so I've tried to slice up whatever comes out fo the vacc into 64 bit slices, delaying subsequent ones so that mux selections lets me capture an entire spectral channel as it comes out of vacc. However, cycling through the mux means I miss all the channels in between count starts. Regardless, I may be going about it the wrong way, so any examples would be greatly appreciated. The ones I've seen concatenate up to 64 bits, so do not have this problem. If anyone wants to take a look, this is intended for getting out the data of a 3 antenna 500 MHz bandwidth correlator for the FASR Subsytem Testbed, FST. http://dl.dropbox.com/u/3531421/test1ghz10Gbe.mdl Thanks, Sam Tun
Re: [casper] fitting large numbers into the 10 Gbe
Hi Sam, The packetizer block in the CASPER library buffers up data from a vector accumulator and can send it out in bursts to the 10GbE block with the appropriate data valid. It sounds like this may be what you need. Mark On Thu, Aug 4, 2011 at 2:55 PM, Samuel Tun samuel@gmail.com wrote: Hello, I'm wondering if anyone has any examples or suggestions on how to get large numbers coming out of vector accumulators into the 10 Gbe block. This block takes 64 bits at a time, so I've tried to slice up whatever comes out fo the vacc into 64 bit slices, delaying subsequent ones so that mux selections lets me capture an entire spectral channel as it comes out of vacc. However, cycling through the mux means I miss all the channels in between count starts. Regardless, I may be going about it the wrong way, so any examples would be greatly appreciated. The ones I've seen concatenate up to 64 bits, so do not have this problem. If anyone wants to take a look, this is intended for getting out the data of a 3 antenna 500 MHz bandwidth correlator for the FASR Subsytem Testbed, FST. http://dl.dropbox.com/u/3531421/test1ghz10Gbe.mdl Thanks, Sam Tun
