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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

How to set clock crossings correctly

I was wondering the best way to do these clock crossings. I have a map_cdc module that is used for clock crossing, and is instantiated in multiple places for different clock domain crossings. I has a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

What about something like this to get the hierarchy?: 


set inst 
# set inst_list 
set inst_list {}
foreach_in_collection c $inst {
	lappend inst_list 
}
set hierarchy_list {}
#  find all hierarchies
foreach each_inst $inst_list {
#  extract the hierarchy
	regexp {^(.*)\|*$} $each_inst matched hier_path 
	if {$hier_path ni $hierarchy_list} {
		lappend hierarchy_list $hier_path
	}
}
foreach each_inst $hierarchy_list {
	set_max_skew  ...
	set_min_delay ...
	set_max_delay ...
	set_net_delay ...
}