digproddev - CS2204 DIGITAL LOGIC STATE MACHINE DESIGN FALL...

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DIGITAL PRODUCT DEVELOPMENT CS2204 DIGITAL LOGIC & STATE MACHINE DESIGN FALL 2009 Polytechnic Institute of NYU Page 1 of 6 Handout No: 11 October 13, 2009 Digital product development aims at a prototype . The prototype is eventually manufactured as a new chip or as a new printed circuit board (PCB) in mass quantities. If it is a new chip it has to be “mounted” on a new PCB. Digital product development for a new chip involves three cycles : (i) the development cycle on computers, (ii) the development cycle with FPGA chips and (iii) the development cycle on a prototype chip. Digital product develop- ment for a new PCB involves three cycles : (i) the development cycle on computers, (ii) the development cycle with off-the-shelf chips and (iii) the development cycle on a prototype PCB. Most of these cycles have three main steps : design/mount, test and modify. Often, these cycles occur as design/mount, test, modify, test, modify,..., test, modify and test. Once the product passes all three development cycles, it is ready for mass production . The chip or the PCB is manufactured in large quantities ! 1) The development cycle on computers consists of designing the product, testing and modifying it, by using a Com- puter Aided Design (CAD) software package. The product is designed, tested and modified piece-by-piece (block- by-block), following the rules mentioned in the General Design Rules handout. To test, input combinations ( test vec- tors ) are applied and outputs are observed. If a minor error is detected during the testing of a block, the block is mod- ified (a simple change). After the modification, the circuit is tested again for correctness. If major errors are encountered, the design step is revisited. In the worst case a complete redesign is performed . While testing and modifying circuits, engineers may realize that slight design changes can be employed to satisfy design goals better. For example, components in the circuit can be eliminated (the minimization), saving hardware and reducing cost. After the minimization, the circuit is tested. There is no rule that specifies exactly when the mini- mization should be performed. In general testing for correctness should precede the minimization to give the designer a chance to become familiar with the circuit. The CAD software package must be “industry-strength,” to be capable of simulating real circuits with possibly mil- lions of transistors or tens of chips, depending on whether a new chip or a new PCB is developed. The CS2204 CAD software is the Xilinx Foundation software which is industry strength. Other widely used software packages include the Cadence, Synopsis and Mentor Graphics which are used for research and education at Polytechnic University. 2) a) If the design passes the test on computers and the goal is to manufacture a new chip , the development cycle with FPGA chips starts. It consists of three steps : mount, test and modify. One or more FPGAs are mounted, tested and modified. The development cycle on computers may be revisited if problems are encountered during testing.
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