Abstract: A functional testing system for programmable logic devices. Test vectors are generated by a shift register and applied to the contact pins of the logic device through isolation elements so that all pins may be treated alike regardless of whether they are inputs or outputs. The logic level on pins that are outputs are controlled by the logic device, while logic levels on pins that are inputs are controlled by the shift register. The response of the logic device to the test vector is recorded in an output shift register and the response is then shifted out of the shift register to one input of an exclusive OR gate that also receives outputs from predetermined stages of the test vector shift register to create a pseudo-random function. The output of the exclusive OR gate is shifted into the test vector shift register as each bit of the logic device's response is applied to the exclusive OR gate thereby creating a new test vector.

Abstract: A new and distinct variety of northern pecan tree (i.e., Carya illinoensis) is provided which can be distinguished from previously known pecan varieties by the extremely early maturity date of its pecan harvest. This permits the successful growing of a pecan crop at more northerly locations than has heretofore been possible, and facilities an earlier pecan harvest at existing pecan production regions of the north. The new variety forms on a regular basis quality kernels which release well from the shells. The tree exhibits a sturdy upright and spreading growth habit as well as excellent hardiness.