On Thu, 25 Aug 2011, Jon Elson wrote: > Date: Thu, 25 Aug 2011 20:30:36 -0500 > From: Jon Elson <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: Re: [Emc-users] D510 EPP problem > > Peter C. Wallace wrote: >> >> We've had customers using the D510 with the 7I43 with no problems >> (other than the BIOS error in mode reporting) So I dont think its >> anything we need to do with the 7I43, its EPP timing is very >> conservative and has not been changed since the very first shipped >> devices. >> > OK, 2 of our products worked fine when tested for the first time with > the D510MO, but an old version of one product > did not communicate. The newer version of that board had a completely > revamped bus interface vhdl module, and also worked. > I did not analyze the problem in depth, but I think the problem related > to timing of the WRITE/ signal to the strobe, it may > have been going away too soon. I latched WRITE/ when recognizing the > strobe and it fixed the problem.
The 7I43 has always done this, but the symptoms (always reading 0 from EPP data address before the FPGA is even configured) point to a port address or mode problem as an EPP read from the 7I43 should read high from bits that are not connected to the CPLD (the config CPLD only drives one bit, and all the others are pulled high). The fact that there are no EPP timeouts when the 7I43 is disconnected also suggest that the port is simply not in EPP mode > > So, the D510MO has a subtle difference in timing of (I think) WRITE/ > that never showed up on other motherboards. > > It is possible that differences in cables could make it work in some > configurations and not others. > > Jon > > ------------------------------------------------------------------------------ > EMC VNX: the world's simplest storage, starting under $10K > The only unified storage solution that offers unified management > Up to 160% more powerful than alternatives and 25% more efficient. > Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
