As a check, you can find the sync pulse period in simulation by putting a single pulse into the sync input at the start of your design and seeing many cycles until the sync pulse shows up at the output of your design. There is also no harm in multiplying by several factors of 2 just to be on the safe side. Glenn
On Wed, Jun 17, 2009 at 11:08 PM, <[email protected]> wrote: > Hi: > > After reading the memo of sync pulse, I still feel a little bit confused. > > I use a PFB in my design. So I guess I have to include the order of PFB > into the calculation. > > The order of PFB is 2. But there are two stage in the PFB. There are 2 taps > in the second stage as well. So I set the reorder to 2 or 4? > > For the FFT, there are 2 order-2 reorder block in the bi_real_unscr_4x, so > I recorder order should be 4. > Its FFT unscrambler use an 8 order block. So its order is 8. > > So the sync period of FFT is 4*8*512/4 = 4096. Is this right? > > What I could not understand is the PFB. I use 2 order or 4? > > Thanks > > Wan >
