Hi Jason, Apologies for confusion, I'm using the scheme as you described: a counter lsb driving the IBOB SMA. This 1/2 speed output clock is level-converted and runs to the BEE2 user clock SMA input. BEE2 designs run off usr_clk2x. I don't know of any way to connect the ibob clock signal directly.
Thanks again, and I look forward to your reply. I'm doing some more testing this afternoon and will see if I can get Billy's scheme up and running. Peace, ~R 2009/8/28 Jason Ray <j...@nrao.edu> > On Fri, 28 Aug 2009, Richard Armstrong wrote: > > This week I've been trying to clock the BEE2 off an IBOB-generated clock >> with an LVTTL-to-LVPECL clock driver. I changed the BEE2 design and >> changed >> a jumper to select user-clock on the BEE2 board. Unfortunately, this >> doesn't >> seem to help much (although, I could be doing it wrong) and I'm finding >> with >> this scheme that the BEE2 has the tendancy to kill the running process >> after >> a few seconds to minutes. >> >> > Admittedly, I have not fully read though all of the replies on this thread > yet, so this might have already been covered.... > > But, if you want the BEE2 running at the same clock rate as your iBOB's, I > think you'll need to select usr_clk2x on the BEE2 and in the BEE2 model > file. Unless there's some other way that Randy & I couldn't find, the best > you can do is connect the LSB of a counter to the iBOB SMA output. This > gives you 1/2 the clk rate of the iBOB. So, you'd be driving the BEE2 at > 1/2 the rate, unless you use usr_clk2x which multiplies the incoming clock > by two to get you back to the same rate. > > Is there some way to connect the actual iBOB clock signal to the SMA GPIO > in the model file? > > Jason > -- Richard Armstrong ʞn˙ɔɐ˙xo˙oɹʇ...@ƃuoɹʇsɯɹɐ˙pɹɐɥɔıɹ +44 (0) 79 0682 9979 (UK mobile) +44 (0) 1865 273597 (Office)
