Jack's fix for sync period constant value.
Merge branch 'master' of https://github.com/casper-astro/mlib_devel
Changing the default clock on R1 to sys_clk

The default clock used to be dac1_clk for some stange reason.
It is now set to sys_clk.
Merge branch 'master' of https://github.com/casper-astro/mlib_devel