The HSP45116-DB is a daughter board designed to mate with the HSP-EVAL for rapid evaluation and prototyping of the HSP45116 Numerically Controlled Oscillator Modulator. Together, the board set provides a mechanism to evaluate HSP45116 operation using IBM PCTM based I/O and control. As shown in Figure 1, the HSP45116-DB maps the input, output, and control signals of the HSP45116 to three 50 pin headers. These headers mate with connectors on board the HSP-EVAL to interface the HSP45116's various I/O and control signals with the HSP-EVAL's data busses. This interface establishes a path for PCTM based I/O and control of the HSP45116-DB via the HSP-EVAL. An IBM PCTM based software package is supplied which controls operation to the HSP45116-DB/HSP-EVAL board set. The software package provides the user with a DOS command line interface and graphical user interface for daughter board I/O and control. Since the software supports data acquisition from the HSP45116, software based signal analysis may be used to quantify part performance. The degree of control exerted by the software varies depending upon the clock supplied to the HSP45116-DB. If a high speed clock is supplied via the HSP-EVAL's on board oscillator or external clock pin, the software can be used to