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 matters to you, I highly recommend you leverage the ECC bits... Jason Manley CBF Manager SKA-SA Cell: +27 82 662 7726 Work: +27 21 506 7300 On 05 Jul 2017, at 16:49, Jack Hickish <jackhick...@gmail.com> wrote: > > > 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 section” says that one type of command cannot be issued > in two consecutive cycles. > > The “bursting” section says that data for both read and write is presented > for two cycles, and that data_in and be must be set for both of those cycles. > > > > Does this mean that a “write event” lasts for two clock cycles? > > If so, can data_in change from the first clock cycle to the second, storing a > total of 144 bits over two cycles? > > > Correct. I believe there is a qdr transpose block in the library which may be > a useful reference design. > > Cheers > Jack > > > > Thanks, > > --Adam > > > > ---------------------------------------------------- > > Adam Schoenwald - Electrical Engineer > > ---------------------------------------------------- > > > > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
