Users should inherit the vprgen.{dict, abstract}based.ArchitectureDelegate
class and implement required methods/properties. The class provides
gen_arch_xml and gen_rrg_xml which generates the architecture description
XML and routing resource graph XML, respectively.
VPRGEN always produces valid XML file, but does not guarantee valid VPR inputs. VPRGEN performs limited validation by using JSON schema.
VPRGEN only supports fixed layout, i.e. the block physically placed at each tile in the grid is known for sure. This is reasonable for real physical devices.
VPRGEN only supports uni-directional segments.
VPRGEN produces a fake <device> tag in the generated architecture
description XML, because the information defined under the tag is either not
useful for physical devices or overwritten by the routing resource graph XML.
<switchblocklist> tag is not supported for the same reason. All
switchblock patterns will be implemented as edges in the routing resource
graph XML.