* Update xdc to use diff_term true instead of diff_term 1
* Generated xdc using adi_fmc_constr_generator.tcl
* Make CSN to be inactive
* Cosmetic changes also
Signed-off-by: Iulia Moldovan <iulia.moldovan@analog.com>
Created a virtual clock to constrain cnv_en.
Given that the cnv_en should be asserted only once per 8 clock
cycles and only the rise edge is of interest, we can constrain
the path as multicycle path.