hi ryan, can you check this into one of the GIT repositories?
thanks, dan On Fri, Mar 1, 2013 at 10:37 AM, Ryan Monroe <[email protected]>wrote: > Hey David, > > I know it's probably too late, but I figured out how to do a QDR-corner > turn without ping-ponging (thus, doubling the effective size of the QDR). > Give me a shout if you need this in the future! > > On 03/01/2013 10:23 AM, David MacMahon wrote: > >> Hi, Jack, >> >> We noticed that one of our designs gave bogus results when run on a ROACH >> 1 board with a serial number in the range 02XXXX, but valid results when >> run on a ROACH 1 board with a serial number in the ranges 03XXXX or 04XXXX. >> >> After much head scratching, we opened up one 02xxxx, one 03xxxx, and one >> 04xxxx roach. The 02xxxx roach (020247) had Cypress CY7C1263V18 QDR chips, >> which are 2Mx18 bits. The 03xxxx roach (030144) had Cypress CY7C15632KV18 >> chips, which are 4Mx18. The 04xxxx roach (040122) had NEC D44647186AF5-E25 >> QDR chips, which are also 4Mx18. >> >> The 2Mx18 bit QDR chips of the 02xxxx roaches can only store 1M >> (1,048,576) 32-bit words which was too small for our design. >> >> Hope this helps, >> Dave >> >> On Mar 1, 2013, at 12:27 AM, Jack Hickish wrote: >> >> Hi All, >>> >>> Is someone able to confirm that the size of the QDR chips on ROACH 1 >>> boards depends solely on the board version? If this is indeed the case, >>> does anyone know the QDR specs for the different board iterations? >>> >>> >>> Cheers, >>> Jack >>> >> >> > >
