1800 - Diamond / Spreadsheet View: How does the user determine Simultaneous Switching Noise (SSN) from within Lattice Diamond tools?
An estimate of SSN can be determined by running the Simultaneous Switching Output (SSO) Analysis tool in the Lattice Diamond Spreadsheet View. Information about SSO Analysis can be found in the Lattice Diamond online help by searching for SSO Analysis. To run SSO analysis:
- Invoke Spreadsheet View for the design and select the Port Assignments tab.
- Assign pin or bank locations to the output or bidirectional signals user wish to analyze.
- Select from the following attributes for each signal to be analyzed:
- an appropriate I/O buffer from the IO_TYPE column
- a drive strength for the output buffers from the DRIVE column
- a slew rate from the SLEWRATE column
- Type a capacitive output load (pF) value in the Outload (pF) Column
- Specify settings in the SSO columns for each signal to be analyzed (SwitchingID, Ground plane PCB noise, Power plane PCB noice, SSO Allowance)
- Select Design->Preference SSO Analysis
- The results are displayed in the Package View. The full SSO Analysis report can be accessed from the Reports tab in the main Lattice Diamond window.