Clock Dependent CAM Parameters

Some CAM parameters are functions of both the circuit configuration and the CAM clock. The corner frequency of a Bilinear Filter is an example of a clock dependent CAM parameter. The "Design Equations" within the documentation for the Bilinear Filter details this relationship by showing that the corner frequency, f0, is a function of two capacitor values and the clock frequency, fc.

The circuit configuration is calculated in the "Set CAM Parameters" dialog box based on the clock that is selected at that time. If this clock’s frequency is then changed in the "Chip Settings" dialog box, the realized CAM parameter values may be affected because the circuit configuration will not change outside of the "Set CAM Parameters" dialog box. For example, if the corner frequency of a Bilinear Filter is set and then the clock frequency is doubled, the corner frequency of the filter will also have doubled despite the fact that the CAM was not explicitly edited. In order to avoid this potential problem, the CAMs can be reconfigured after the clock settings are selected. When the "Set CAM Parameters" dialog box is opened, the circuit configuration is calculated again, based on the clock that is selected at that time. Then any changes can be made and the current configuration should be selected with the "OK" button. If the CAM clocks are changed after the CAMs are configured, AnadigmDesigner®2 may issue a warning when a circuit is saved, simulated or used to create a configuration bit stream.