Re: [myhdl-list] Bus Transaction Models and Testbenches
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Re: [myhdl-list] Bus Transaction Models and Testbenches
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From: Felton C. <chr...@gm...> - 2009-09-01 12:49:42
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On Sep 1, 2009, at 5:13 AM, Jan Decaluwe wrote: > Felton Christopher wrote: >> >> I have created a simple bus model to interface to my design. I >> have a >> generator that will pull data from a FIFO (python list). And a >> bunch of >> functions that write and read to the FIFO. > > If I understand it well, your problem is the use of "sub" generators > within other generators. This is actually an ongoing topic of > developments and approaches in the Python world. But in MyHDL, this > issue was recognized early on and solved by permitting a generator > to yield another generator, with the same "waiting" semantics as > for the other cases. > > It's probably not yet used very often, but isn't this > what you are looking for? > > http://www.myhdl.org/doc/0.6/manual/modeling.html#modeling-with-bus-functional-procedures > That its, exactly what I was trying achieve. Have not try it yet but will shortly. Thanks! Chris > Jan > >> >> My testbench uses the functions (and generators) to interface to the >> DUT. The following is an example: >> >> ----------- >> gen = fx2Model.WriteAddress(0x0103, 0xAA) >> yld = gen.next() >> while yld is not None: >> yield yld >> yld = gen.next() >> ... >> TracePrint('Wait for data in read fifo') >> while not fx2Model.IsData(fx2Model.EP8, 5): >> yield delay(2*fx2Model.IFCLK_TICK) >> >> for dat in test_data1: >> rdata = fx2Model.Read(fx2Model.EP8) >> assert rdata == dat, \ >> "Testbench FAILED return data %x expected %x" % (rdata, dat) >> >> ---------- >> >> My questions (issue) is that the transactors have many steps (do >> multiple "things") and need to "yield". A yield, relinquish to the >> simulation engine, can only be issued at the top testbench generator. >> The functions (generators) that encapsulate the bus transactions only >> return what to "wait for". But I would like my testbenches to be >> read as: >> >> ---------- >> fx2Model.WriteAddress(0x0103, 0xAA) >> fx2Model.Read(fx2Model.EP8, rdata) >> ---------- >> >> I don't know how to achieve the desired second example because the >> model >> functions (generators) would need to yield. If the yields are in the >> model it will only yield to the top testbench function >> (generator). Any >> suggestions or ideas welcome. >> >> I have posted the project on the MyHDL website, more information is >> available here, http://www.myhdl.org/doku.php/users:cfelton:projects:usbp >> >> Thanks >> Chris >> >> >> ------------------------------------------------------------------------ >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports >> 2008 30-Day >> trial. Simplify your report design, integration and deployment - >> and focus on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> myhdl-list mailing list >> myh...@li... >> https://lists.sourceforge.net/lists/listinfo/myhdl-list > > > -- > Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com > Python as a HDL: http://www.myhdl.org > VHDL development, the modern way: http://www.sigasi.com > Analog design automation: http://www.mephisto-da.com > World-class digital design: http://www.easics.com > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 > 30-Day > trial. Simplify your report design, integration and deployment - and > focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > myhdl-list mailing list > myh...@li... > https://lists.sourceforge.net/lists/listinfo/myhdl-list |
