FSDB stands for “Fast Signal Data Base”. This file format was developed by NOVAS to replace VCD (value change dump) files. After a number of acquisitions Synopsys Inc owns FSDB.
FSDB files are binary and they make use of data compression. As a consequence they are a lot smaller that VCD files and reading them is a lot faster. Many tools can read and write files in FSDB format.
Like the VCD format, FSDB files are perfect for digital waveforms and a bit less appropriate for analog data. However, as they are so compact, many analog simulators have the option to write waveforms to FSDB files.
Theoretically the x-axis data can hold real values. However in practice the x-axis values are positive integers. As a consequence the x-axis values are discrete. Very small time steps of analog simulators might not always be represented correctly.
All variables are compressed into a single data block. Each block of compressed data represents a time interval. Therefore the whole file must be decompressed for accessing a single curve. Other compression schemes might be a lot faster …
The integer x-axis values must be positive and complex values aren’t supported at all. Therefore analog simulators mostly use the FSDB file format for transient data.
To compile this plug-in you need the following from Synopsys software distribution:
- the license to use the following.
- the header files ffrAPI.h, ffrKit.h and fsdbShr.h.
- the header file ffwAPI.h if the write functionality is required.
- the shared libraries libnffr.so and libnsys.so on Linux.
- the shared library libnffw.so if the write functionality is required on Linux.
- the shared library nffr.dll on Windows.
- the shared library nffw.dll if the write functionality is required on Windows.
Please contact our support for more information.