Thanks again Glenn. In Peter MacMahon's User Guide for the Parkes Radio Telescope, this reads:
Accumulation Length = 13 Spectral Dump = 30,048 spectra per second Data Rate = 471Mbits/second Accumulation Length = 2 Spectral Dump = 195.313 spectra per second Data Rate = 2.99Gbits/second Accumulation Length = 1024 Spectral Dump = 381 spectra per second Data Rate = ? Accumulation Length = 256 Spectral Dump = 1,526 spectra per second Data Rate = ? What is the equation that relates these three variables: Accumulation Length, Spectral Dump and Data Rate? Best Regards Rolando Paz 2014-08-04 9:47 GMT-06:00 G Jones <[email protected]>: > Hi Rolando, > I think that sync period seems OK. Accumulation length is set by the user > typically, but the default is probably fine. The one concern is that number > is > 2^32, so be careful that your sync period register is set up to handle > that case. The software registers are 32 bits wide, so it probably will > overflow. In which case you should reduce accumulation length to make sure > that sync period is < 2^32. When you do that, you'll also want to use the > appropriate value for the accumulation length register, wherever that is in > your design. > > Glenn > > > On Mon, Aug 4, 2014 at 11:38 AM, Rolando Paz <[email protected]> wrote: > >> Hi All >> >> The sync_period is = n * k * LCM (reorder orders) * PFB_taps * >> FFT_length / #simultaneous_inputs >> >> n=100 >> k= 1460? (copied from poco) >> LCM(2,2,2,9)=18 >> PFB_taps=4 >> FFT_length=2048 >> #simultaneous_inputs=4 >> >> sync_period= 5382144000 >> >> 1) Is this sync_period correct? >> 2) k is the Accumulation Length. How do I get this value? >> 3) Is it correct the value of LCM (reorders)? >> >> Now I understand more the design, so more questions arise :-) >> >> Best Regards >> >> Rolando Paz >> >> >
