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sergey kostanbaev sergey.kostanbaev at gmail.comI also haven't had a time to look at. Hopefully I'll look at Friday. On Apr 9, 2014 10:52 PM, "Andrew Karpenkov" <plddesigner at gmail.com> wrote: > Ok. I understand. > > I suppose that before make changes in current fpga code, we should make a > decision exactly which architecture more suitable for UmTRX, N2x0 or B200? > Sergey, Josh, what do you think about this, pro and con? > > Unfortunately, I can look into B200 fpga code only at friday.. > > Regards, > Andrew Karpenkov > > > 2014-04-09 20:43 GMT+03:00 Josh Blum <josh at joshknows.com>: > >> >> >> On 04/09/2014 03:17 AM, Andrew Karpenkov wrote: >> > Josh, >> > I'm glad that I answered on most of yours questions. If you need some >> more >> > information, don't hesitate to contact with me. >> > >> > 104MHz fifo bus in -> cross clock fifo to 26 MHz -> vita tx deframer -> >> >> paced tx dsp -> out to dac >> >> in from adc -> paced rx dsp -> vita rx deframer -> cross clock fifo to >> >> 104 MHz -> 104 MHz fifo bus out >> > >> > >> > According to your idea. I think that this is fine, but are you're sure >> that >> > 26MHz is enough for DSP calculations? In N2x0 DSP clock frequency was >> twice >> > higher than CPU clock. >> > >> >> Well technically, the DSP only needs to run as fast as the ADC/DAC >> sample rate. In the current UMTRX design, the DSP calculations >> themselves are running at 13 MHz. I'm only suggesting moving the VITA >> framer/deframer into the same clock domain as the DSP units (26MHz). The >> actual buffering, packet routing, fifo muxing, that sort of stuff will >> stay in the 104MHz clock domain (it has to be faster because of >> buffering/sending ethernet packets). And the CPU/ZPU/wishbone clock is >> independent, and really only for low speed communications -- I would >> simply keep this at 52 Mhz, but in fact, its clock rate isnt really >> critical. >> >> -josh >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20140409/cf74af28/attachment.htm>