[casper] QDR Help / Timing Diagram

Hi All, I've abandoned my attempt to use the DRAM for now and moved on to QDR. I'm somewhat confused by the wiki at https://casper.berkeley.edu/wiki/Qdr . The "issuing commands section" says that one type of command cannot be issued in two consecutive cycles. The "bursting" section says that

Re: [casper] QDR Help / Timing Diagram

On Wed, Jul 5, 2017, 6:56 AM Schoenwald, Adam J. (GSFC-5640) < adam.schoenw...@nasa.gov> wrote: > Hi All, > > I’ve abandoned my attempt to use the DRAM for now and moved on to QDR. > > I’m somewhat confused by the wiki at https://casper.berkeley.edu/wiki/Qdr > . > > > > The “issuing commands

RE: [casper] QDR Help / Timing Diagram

Thanks Jack, Jason, I think I have the QDR Timing down now, at least in simulation. Do I need to do anything special to use the ECC bits? If I want to calibrate QDR, does that mean I must include the CPU interface? Is this related to how I set the be flag ? Thanks, --Adam

Re: [casper] QDR Help / Timing Diagram

On Wed, 5 Jul 2017 at 11:01 Schoenwald, Adam J. (GSFC-5640) < adam.schoenw...@nasa.gov> wrote: > Thanks Jack, Jason, > I think I have the QDR Timing down now, at least in simulation. > > Do I need to do anything special to use the ECC bits? If I want to > calibrate QDR, does that mean I must

Re: [casper] QDR Help / Timing Diagram

There's also a testbench for our ROACH2 VACC that's currently in service on MeerKAT, which may help you: https://github.com/ska-sa/cbf_fpga_testbenches/blob/master/test_qdr_vacc5.slx Note that there are calibration problems with QDR on ROACH2, so you'll likely encounter bit errors. If this

Re: [casper] Configuring 40GbE Yellow Block in JASPER

Hello, I have solved my issue of not being able to receive data. Instead of directly connecting the SKARABs, I routed them through a 40 GbE switch where the DHCP server can assign both of the SKARABs an IP address. I am still not sure why directly connecting them does not work, however that

Re: [casper] Configuring 40GbE Yellow Block in JASPER

Hello, I am still having issues receiving data over 40 GbE. I currently have a direct connection between the transmitting and receiving SKARABs, both on the leftmost 40 GbE port of Mezzanine slot 3 . Using tcpdump on a server with a 40GbE interface, I was able to confirm that the SKARAB which