To Whom It May Concern,

I would like to highly recommend Greg Lenihan for attending your Ph.D. program. I have known Greg since 1998 through a joint project between Boeing and Goodrich. The project goal was to develop a RISC microprocessor with instruction set compatible to the most popular ARM microprocessor with cache, IEEE floating point, memory management unit, peripheral, DMA, fault tolerant feature, and write buffer in a single chip.

Greg was instrumental in designing the test board and a memory controller in a FPGA. The test board was so significant for verification that we can run the complete test suites in hardware. Otherwise, we would never complete the test with software simulator.

Greg was a fast learner. As an author of two VHDL texts and teaching VHDL to many, I was amazed how fast he could pick up VHDL and designed the complex memory controller with VHDL simulator, FPGA synthesis tool, and loaded the FPGA code on the board. He also contributed many innovative ideas such as fault tolerant features and test methodologies. His persistence helped to find many design problems that were deep and complicated.

With his much background in actual design experiences in various areas, fast learning capability, innovation, and persistence in completing the work, I believe he can do well in his graduate research and study. Your favorable consideration is appreciated.

Sincerely,

Dr. K. C. Chang

Technical Fellow

Boeing Space and Communications

P. O. Box 3777, MC 8Y-39

Seattle, WA 98124

(253) 773-9282

kou-chuan.chang@boeing.com