Thank you Jack, so far the method we have found to fix this issue works as long as we keep the roach up, thus the undriven-SPI do not bother us that much. I had a look at the verilog hdl, I am quite use to verilog and SPI (I did something similar for an I2C interface) but I can't say the same for OPB bus, power-pc's and so on... it will take me a while I guess. I will contact you when I will be on it.
Cheers, Paolo 2018-02-20 19:57 GMT+01:00 Jack Hickish <[email protected]>: > Hi Paolo, > > If I'm reading the code correctly -- https://github.com/casper- > astro/mlib_devel/blob/roach2/xps_library/%40xps_adc_mkid/xps_adc_mkid.m -- > I believe that none of the SPI pins are driven. I have no idea whether any > of these pins are pulled in any particular direction on the hardware since > I haven't checked the schematics. > > I don't think there is a ready-to-use PPC<->SPI block, but there should be > a variety of examples of SPI interfaces for other ADCs in the library -- > https://github.com/casper-astro/mlib_devel/blob/roach2/ > xps_base/XPS_ROACH_base/pcores/opb_adc5g_controller_ > v1_00_a/hdl/verilog/opb_adc5g_controller.v > > Integrating such an interface shouldn't be that hard, though involves > getting dirty with the toolflow. If you're sure this is your problem and > want a hand, give me a shout and I'll try and find the time to help you do > this. > > Cheers > Jack > > On Mon, 19 Feb 2018 at 09:36 Paolo Fresch <[email protected]> wrote: > >> Dear all, >> >> >> >> I am a technical research fellow at INFN sezione di Roma, I am >> experiencing strange issue using roach + *mkid DAC/ADC board* >> <https://static1.squarespace.com/static/59c075f56f4ca3a44435bdb9/t/59f4e9ae24a694055a5761ad/1509222838779/MKID_DAC_ADC_brief.pdf> >> . >> >> >> >> Basically, after a “cold” startup the DAC does not generate the correct >> sinusoid but either nothing or something senseless. I have a bit of >> hardware background especially in serial chip-to-chip buses, I think it is >> a problem due to the SPI DAC configuration bus that should be tied to >> Virtex-6. In fact, if I “touch” the SPI connector on the DAC/ADC board the >> DAC starts to output the correct signal. >> >> >> >> Since no pcore is connected to these pin (and matlab prompt a warning >> while compiling using casper_xps toolchain) I think this strange behavior >> is caused by the undriven pin (at least the spi_resetn) on Virtex side. >> >> >> >> Can you confirm that these pins are undriven in the last update of the >> yellow block present in the casper mlib_devel ? There is any block in the >> casper xps_base or xps_library I can use to interface the PPC with the SPI? >> Do I need to design this block from scratch? >> >> >> >> Can you help me on this? >> >> >> >> Thank you in advance. >> >> >> >> BR, >> >> Paolo Fresch >> >> -- >> You received this message because you are subscribed to the Google Groups >> "[email protected]" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> > -- > You received this message because you are subscribed to the Google Groups " > [email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected].
