Hi, Richard, On Nov 7, 2014, at 9:03 AM, Richard Black wrote:
> Haven't heard anything for a while, so I thought I would add some more detail > about our system setup to see if it might shed some light on the problem: > > 1 PPS Signal > ----------------------------------------- > Square pulse > Frequency: 1 Hz > Amplitude: 3 Vpp > Offset: 0 V > Width: 10 ms > Edge Time: 5 ns That should be fine assuming the 3 Vpp is measured with the 50 ohm termination in place. If you want to try a software sync, you can pass "-S" (UPPERcase!) to the latest paper_feng_init.rb script. Check the output of "paper_feng_init.rb --help" to see whether your version supports that option. > ADC Clock > ----------------------------------------- > CW Tone > Frequency: 200 MHz > Power: -9 dBm It would be a good idea to increase the power level to +6 dBm as described on this wiki page: https://casper.berkeley.edu/wiki/ADC16x250-8_coax_rev_2#ADC16x250-8_coax_rev_2_Inputs But if the paper_feng_init.rb script reports that the ADC clocks are locked and they measure approximately 200 MHz, then I think this is unlikely to be the cause of the 10 GbE overflow problems (though it would be great if the fix were this simple!). > For David, are there any red flags with our UBoot version or ROACH CPLD? Here > they are again for reference: > > From serial interface after ROACH reboot > ================== > U-Boot 2011.06-rc2-00000-g2694c9d-dirty (Dec 04 2013 - 20:58:06) > ... > CPLD: 2.1 > ================== This matches one of our ROACH2s that is running and sending 10 GbE packets in our lab: U-Boot 2011.06-rc2-00000-g2694c9d-dirty (Dec 04 2013 - 20:58:06) CPU: AMCC PowerPC 440EPx Rev. A at 533.333 MHz (PLB=133 OPB=66 EBC=66) No Security/Kasumi support Bootstrap Option C - Boot ROM Location EBC (16 bits) 32 kB I-Cache 32 kB D-Cache Board: ROACH2 I2C: ready DRAM: 512 MiB Flash: 128 MiB In: serial Out: serial Err: serial CPLD: 2.1 USB: Host(int phy) SN: ROACH2.2 batch=D#6#69 software fixups match MAC: 02:44:01:02:06:45 DTT: 1 is 23 C DTT: 2 is 26 C Net: ppc_4xx_eth0 Hope this helps, Dave
