A tile-map caching technique in which it is determined whether a tile object is stored in a first cache that is configured to store a plurality of tile objects associated with a map. The scan chain is transformed by the test synthesis tool of the present invention into dynamic scan chains with the addition of reconfiguration circuitry. A second circuit board having a second device side with a second portion configured to mount a second plurality of semiconductor devices is disposed in confronting parallel relationship to the first circuit board. The receivers may be direct conversion receivers that implement up-conversion of the baseband signal to reduce DC offset and 1f noise characteristic of direct conversion architectures. Accordingly, the circuit can maintain a fixed input voltage received by the fluorescent tube.