I am a technical research fellow at INFN sezione di Roma, I am experiencing
strange issue using roach + *mkid DAC/ADC board*
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.
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