Hi Yunpeng, You can try "Black Boxing" parts of your design, that you know works. There's a tutorial on the CASPER wiki here:
https://casper.berkeley.edu/wiki/Tutorial_HDL_Black_Box I hope this helps. On Sun, Jun 4, 2017 at 4:43 AM, 门云鹏 <yp...@pku.edu.cn> wrote: > Hi James, Michael, and Vereese, > > Thanks for your reply. I have read the timing report to find the failing > paths, and tried to add delay blocks or increasing adder / multiplier > latency. It works well but not always, especially for timing errors in some > yellow blocks, for instance > > I will try SmartXplorer and PlanAead, and see if they work. > > What's more, the casper_xps toolflow often takes a few hours, which makes > me crazy (>﹏<). I guess this is because timing constraints are difficult > to meet. I wonder if there is any good method to accelerate the xps > toolflow. (Map uses 2 processors, and par uses 4 processors by default. The > cpu is @2.70GHz 8M) > > Thank you all again, > > Yunpeng > > > > ------------------------------------------------------------ > ----------------------- > Yunpeng Men > PhD student > Department of Astronomy & Kavli Institute for Astronomy and > Astrophysics, Peking University > Yi He Yuan Lu 5, Hai Dian Qu, Beijing 100871, P. R. China > > -----原始邮件----- > *发件人:*"James Smith" <jsm...@ska.ac.za> > *发送时间:*2017-06-04 01:44:39 (星期日) > *收件人:* "Michael D'Cruze" <michael.dcr...@postgrad.manchester.ac.uk> > *抄送:* "门云鹏" <yp...@pku.edu.cn>, "casper@lists.berkeley.edu" < > casper@lists.berkeley.edu> > *主题:* Re: [casper] timing errors > > > Hello Yunpeng, > > Just to echo what Michael and Vereese said - those tools can help you get > a bit more insight into what's going on, and how badly your timing problem > is, but the timing report should tell you how by how much you're missing > timing (should be some nanosecond value). > > If it's just a small amount then sprinkling a few delay blocks in-between > major sections of your design, or increasing adder / multiplier latency in > your DSP blocks can usually help. > > Regards, > James > > > On Sat, Jun 3, 2017 at 6:54 PM, Michael D'Cruze <michael.dcruze@postgrad. > manchester.ac.uk> wrote: > >> Hi Yunpeng, all, >> >> >> >> I recently wrote a memo which describes how you can use Xilinx >> SmartXplorer to help with timing issues. Have a look on the casper wiki in >> the Memos section: https://casper.berkeley.edu/wi >> ki/images/f/f8/SmartXplorer_memo.pdf . It isn’t a free pass – you need >> to get fairly close using knowledge of individual hardware types on the >> FPGA, and you need to space out your design reasonably, by using pipelines. >> But it should help get over the final hurdle if you’re doing a reasonable >> job initially. >> >> >> >> Best, >> >> Michael >> >> >> >> *From:* 门云鹏 [mailto:yp...@pku.edu.cn] >> *Sent:* 03 June 2017 16:00 >> *To:* casper@lists.berkeley.edu >> *Subject:* [casper] timing errors >> >> >> >> Dear all, >> >> I am using ROACH2 to develop digital receiving backend, but I often >> encounter timing errors when I run casper_xps toolflow. I wonder if there is >> any general solution to these timing errors. >> >> Thanks a lot, >> >> Yunpeng >> >> >> >> ------------------------------------------------------------ >> ----------------------- >> >> Yunpeng Men >> >> PhD student >> >> Department of Astronomy & Kavli Institute for Astronomy and >> Astrophysics, Peking University >> >> Yi He Yuan Lu 5, Hai Dian Qu, Beijing 100871, P. R. China >> >> -- >> 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. > -- Kind Regards, Vereesé -- 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.
