What format is VCD file?
What format is VCD file?
A VCD file is a disc image of a CD or DVD and is recognized by Windows as an actual disc, even though the data is on the hard drive. VCD files allow CDs and DVDs to be used without requiring physical drives and is useful for mounting discs on network computers.
What is VCD file in VHDL?
The VCD file is an ASCII file containing header information, variable definitions, and variable value changes. The VCD files store information about value changes during simulation for nets and registers. You can export waveforms containing VHDL signals to a VCD file.
What does a VCD file contain?
The VCD file comprises a header section with date, simulator, and timescale information; a variable definition section; and a value change section, in that order. The sections are not explicitly delineated within the file, but are identified by the inclusion of keywords belonging to each respective section.
What is the format of generated VCD files?
The format of generated VCD files adheres to IEEE ® Std 1364-2001. The table describes the format. Date and time the file was generated. Version of the To VCD File block that generated the file. Timescale used during the simulation. Scope of module being dumped.
What is the integer type in VHDL?
The integer type is used to define objects whose value is always a whole number. VHDL doesn’t specify the exact number of bits for the integer type, but any VHDL implementation should support at least a 32-bit realization.
Why do we need to perform type conversions in VHDL?
As a result, it is often necessary to explicitly perform type conversions in VHDL. With a few exceptions, every signal or port in a VHDL design fundamentally consists of one or more logical bits. We use the different types in VHDL to tell our tools how this collection of bits should be interpreted.
How do you use hexadecimal notation in VHDL?
When we assign data to vector types in VHDL we use quotation marks (“) instead of apostrophes. We can also specify data using hexadecimal notation by appending an x to the start of the data. However, this only works if the number of bits in the vector is a factor of four.
