I've just started looking at the abovementioned core and its associated testbench. Out-of-the-box it fails fairly early on in the piece... I've managed to find that problem... The main test look was calling wb_wr4 with a delay value of 0 for the 1st iteration of the test. In this case stb is being de-asserted and reasserted immediately and the cycle never completes. I simply changed the starting value of the loop to '1' but I'm wondering why it failed in the first place? iotest1 now completes with 0 errors. iotest2 fails immediately but I'm yet to look into it. Regards, -- Mark McDougall, Software Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266

Mark McDougall wrote:

OK, so it would seem that the testbench is for OCIDEC1 only, given the return code on the STAT register. However, since they're supposedly backwards-compatible, I've changed the expected test result and will forge ahead!?! Now I get setup violations... # *** MODE SELECT: PIO mode: 0 iordy enable: 0 # ** Error: P:/MK7/fw/ide/ide at a/bench/ata_device.v(227): $setup( ata_cs0:455 ns, posedge ata_dior &&& ata_rst_m0:515 ns, 70 ns ); # Time: 515 ns Iteration: 4 Instance: /test/a0 # *** MODE SELECT: PIO mode: 0 iordy enable: 1 # ** Error: P:/MK7/fw/ide/ide at a/bench/ata_device.v(227): $setup( ata_cs0:86915 ns, posedge ata_dior &&& ata_rst_m0:86975 ns, 70 ns ); # Time: 86975 ns Iteration: 4 Instance: /test/a0 Investigations continue... -- Mark McDougall, Software Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266

Mark McDougall wrote:

Interesting that the io_test2 task writes new timings to PCTR which violate these specs immediately before running the tests... is this *supposed* to happen??? Is this testbench meant to run without errors out-of-the-box, or am I doing something stupid? I can't seem to find any doco on the bench itself... Regards, -- Mark McDougall, Software Engineer Virtual Logic Pty Ltd, http://www.vl.com.au> 21-25 King St, Rockdale, 2216 Ph: +612-9599-3255 Fax: +612-9599-3266