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 "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
