If the module you are importing has at least one combinational path (i.e.
a change on any input can effect an output port without a clock event), you must
indicate this in the configuration M-function. SysgenBlockDescriptor object provides a
tagAsCombinational method that indicates your module
has a combinational path. It should be invoked as follows in the configuration
M-function:
this_block.tagAsCombinational;