Hi Laura The 64 x 64b FIFO are switched in behind the 8KB FIFO, so this is actually fine.
HK On Wed, May 30, 2012 at 8:29 AM, Henno Kriel <[email protected]> wrote: > Hi Laura > > I had a look at the xco coregen file for TX Fifo when the "Enable Large Tx > Frames" option is used (8K Packets). The size of the FIFO seems to be only > 64 deep!? > > I will investigate further... > > HK > > > On Wed, May 30, 2012 at 1:45 AM, Laura Vertatschitsch > <[email protected]>wrote: > >> Hey guys, >> >> I've got several designs where I consistently clock 512 64-bit samples >> into the ten gbe0 (v2 block) at a rate of ~14MHz. The fpga clock is >> running at 200. It's my understanding that I still should have some room >> to get faster data off. I went up by a factor of 2 (the only change in my >> design) to clock the data, still only 512 samples, at a new rate of ~28MHz. >> Not a single packet is sent, and the tx_afull and tx_overrun flags are >> consistently high. I was surprised by this, as I am only creating >> 4096Bytes in the frame and I know ~8000B is the limit. I've simulated in >> Simulink to be sure that the tx_valid and eof flags are being set when I >> want. >> >> Could there be something else going on here? Could the tx_overrun flag >> also be set in the event that the buffer cannot clear out the data before >> the next data point in? >> >> --Laura Vertatschitsch >> > > > > -- > Henno Kriel > > DSP Engineer > Digital Back End > meerKAT > > SKA South Africa > Third Floor > The Park > Park Road (off Alexandra Road) > Pinelands > 7405 > Western Cape > South Africa > > Latitude: -33.94329 (South); Longitude: 18.48945 (East). > > (p) +27 (0)21 506 7300 > (p) +27 (0)21 506 7365 (direct) > (f) +27 (0)21 506 7375 > (m) +27 (0)84 504 5050 > -- Henno Kriel DSP Engineer Digital Back End meerKAT SKA South Africa Third Floor The Park Park Road (off Alexandra Road) Pinelands 7405 Western Cape South Africa Latitude: -33.94329 (South); Longitude: 18.48945 (East). (p) +27 (0)21 506 7300 (p) +27 (0)21 506 7365 (direct) (f) +27 (0)21 506 7375 (m) +27 (0)84 504 5050
