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 glenn.calt...@gmail.com:
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 flx...@gmail.com 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
