Hi David, That was exactly the information i was looking for -- thanks!
Jack On 1 March 2013 18:23, David MacMahon <dav...@astro.berkeley.edu> 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 > >
