The MC145220EVK makes it easy to exercise features of the MC145220 and build PLLs which meet individual performance requirements. The EVK is controlled through menu driven software operating on an IBM PC or compatible. Other Motorola PLL EVKs (MC145190, MC145191, MC145192, MC145200, MC145201, MC145202) in up to threeboard cascades can use the same program. Frequency defaults that apply to each are automatically selected. All board functions are controlled through the printer port of an IBM PC. Up to three different EVKs may be controlled at the same time from one printer port. The functional block diagram is given in Figure 1. This manual is divided into three sections. Section 1 describes the hardware, Section 2 describes the software, and Section 3 is the command summary.