I like this plan. I think 4 + 4 channels will also make the front panel connector density more reasonable. What are you thinking for number of daughter cards? I suppose that more would give us more flexibility, but less would be more economical in terms of cost and layout area. Perhaps two daughter cards would be reasonable: one for all of the inputs and one for all of the outputs?
Best, Dave -----Original Message----- From: ARTIQ [mailto:artiq-boun...@lists.m-labs.hk] On Behalf Of Sébastien Bourdeauducq Sent: Wednesday, March 30, 2016 5:50 AM To: Grzegorz Kasprowicz <kaspr...@gmail.com> Cc: 'Grzegorz Kasprowicz' <gkasp...@elka.pw.edu.pl>; artiq@lists.m-labs.hk; Slichter, Daniel H. (Fed) <daniel.slich...@nist.gov> Subject: Re: [ARTIQ] FW: initial specification of the project On Tuesday, 29 March 2016 11:55:19 PM HKT Grzegorz Kasprowicz wrote: > - they can be used immediately with existing OSHW carriers like AFC/AFCK. AFCK may be overkill. We are still working on evaluating the FPGA resource requirements. > - it could be hard to fit FPGA, supply, DACs and several RF modules, > all on single dual width AMC, especially when shielding is required. > RTM relaxes these constraints > - on AMC+RTM you can place 8 ADC channels + 8 DAC channels + 8 RF > modules. In case of single AMC board it would be hard to achieve such > channels density. How about this: * we reduce the number of channels per AMC to 4 DACs + 4 ADCs * we can therefore use a smaller FPGA. Communication lanes to the master board are relatively cheap if we put them on IOSERDES. * the power density and cooling requirements are also reduced. * for the RF daughter cards, we use a custom form factor that can use at least 2/3 of the AMC front panel * connectors between the DSP card and the RF daughter card are 2mm header and 8x SMP * the rest of the AMC front panel used for (optional, runtime selectable) clock input and some TTLs. Sébastien _______________________________________________ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq _______________________________________________ ARTIQ mailing list https://ssl.serverraum.org/lists/listinfo/artiq
