I'm pretty sure they're twice as wide to keep up with the increased processing throughput possible with the bigger FPGA.
On Tue, Feb 5, 2013 at 3:10 PM, David MacMahon <dav...@astro.berkeley.edu> wrote: > When I place a QDR yellow block in a ROACH model, the "data out" port is 36 > bits wide. In a ROACH2 model, the QDR "data out" port is 72 bits wide. The > "data in" port seems to double in expected width as well on ROACH2 as > compared to ROACH. > > Why the dramatic interface change for ROACH2? Are the data ports on the > ROACH2 QDR chips really twice as wide as on the ROACH QDR chips or has the > QDR use pattern changed for ROACH2 or ??? > > Thanks, > Dave > >
