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GTKWave save file generator.
This module provides tools for generating GTKWave save files.
GTKWave is an application for viewing VCD data. When opening a VCD file withGTKWave, by default, no VCD variables (signals) are displayed. It is thus useful to havean accompanying “save” file which configures various aspects of how GTKWave shows theVCD data, including which variables are displayed, variable aliases, color information,and more.
vcd.gtkw.
GTKWSave
(savefile: IO[str])[source]¶Write GTKWave save files.
This class provides methods for writing the various pieces of a GTKWave save file. AGTKWave save file compliments a VCD dump file with dump file specific configurationGTKWave uses to display the dump file.
A GTKWave save file is line-oriented ASCII text. Each line consists of a singleconfiguration directive. All directives are optional.
Some directives, such as
dumpfile()
, are for general GTKWave configuration.These general directives may be added anywhere in the save file and in any orderrelative to other directives. Directives may also be duplicated–the last one addedwill be used by GTKWave.The
trace()
, trace_bits()
, group()
, and blank()
directives add signals to the “Signals” list which are traced in the “Waves” frame.The order in which these signal traces are added determines the order in GTKWave.comment
(*comments) → None[source]¶Add comment line(s) to save file.
dumpfile
(dump_path: str, abspath: bool = True) → None[source]¶Add VCD dump file path to save file.
The [dumpfile] must be in the save file in order to only have to specify thesave file on the gtkwave command line. I.e.:
If the [dumpfile] is not present in the save file, both the dump and savefiles must be specified to gtkwave:
$ gtkwave my.vcd my.gtkw
Parameters: |
|
---|
dumpfile_mtime
(mtime: Union[float, time.struct_time, datetime.datetime, None] = None, dump_path: Optional[str] = None) → None[source]¶Add dump file modification time to save file.
Configuring the dump file’s modification time is optional.
dumpfile_size
(size: Optional[int] = None, dump_path: Optional[str] = None) → None[source]¶Ghar ka chirag serial dd national in hindi. Add dump file size annotation to save file.
Configuring the dump file’s size is optional.
savefile
(save_path: Optional[str] = None, abspath: bool = True) → None[source]¶Add the path of the save file to the save file.
With no parameters, the output file’s name will be used.
Configuring the [savefile] is optional.
Parameters: |
|
---|
timestart
(timestamp: int = 0) → None[source]¶Add simulation start time to the save file.
zoom_markers
(zoom: float = 0.0, marker: int = -1, **kwargs) → None[source]¶Set zoom, primary marker, and markers ‘a’ - ‘z’.
size
(width: int, height: int) → None[source]¶Set GTKWave window size.
pos
(x: int = -1, y: int = -1) → None[source]¶Set GTKWave window position.
treeopen
(tree: str) → None[source]¶Start with tree open in Signal Search Tree (SST).
GTKWave specifies tree paths with a trailing ‘.’. The trailing ‘.’ willautomatically be added if it is omitted in the tree parameter.
Parameters: | tree (str) – scope/path/tree to be opened in GTKWave’s SST frame. |
---|
signals_width
(width: int) → None[source]¶Set width of Signals frame.
sst_expanded
(is_expanded: bool) → None[source]¶Set whether Signal Search Tree (SST) frame is expanded.
pattern_trace
(is_enabled: bool) → None[source]¶Enable/disable pattern trace.
group
(name: str, closed: bool = False, highlight: bool = False) → Generator[None, None, None][source]¶Contextmanager helper for
begin_group()
and end_group()
.This context manager starts a new group of signal traces and ends the group whenleaving the with block. E.g.:
Parameters: |
|
---|
begin_group
(name: str, closed: bool = False, highlight: bool = False) → None[source]¶Begin a new signal trace group.
Consider using
group()
instead of begin_group()
andend_group()
.Parameters: |
|
---|
end_group
(name: str, closed: bool = False, highlight: bool = False) → None[source]¶End a signal trace group.
This call must match with a prior call to
begin_group().Considerusing:meth:`group()
instead of begin_group()
and end_group()
.Parameters: |
|
---|
blank
(label: str = ', analog_extend: bool = False, highlight: bool = False) → None[source]¶Add blank or label to trace signals list.
Parameters: |
|
---|
trace
(name: str, alias: Optional[str] = None, color: Union[vcd.gtkw.GTKWColor, str, int, None] = None, datafmt: str = 'hex', highlight: bool = False, rjustify: bool = True, extraflags: Union[vcd.gtkw.GTKWFlag, Sequence[str], None] = <GTKWFlag.0: 0>, translate_filter_file: Optional[str] = None, translate_filter_proc: Optional[str] = None) → None[source]¶Add signal trace to save file.
Parameters: |
|
---|
Note
GTKWave versions <= 3.3.64 require vector signal names to have a bit rangesuffix. For example, an 8-bit vector variable “module.myint” would be knownby GTKWave as “module.myint[7:0]”.
GTKWave versions after 3.3.64 do not use bit-range suffixes.
trace_bits
(name: str, alias: Optional[str] = None, color: Union[str, int, None] = None, datafmt: str = 'hex', highlight: bool = False, rjustify: bool = True, extraflags: Union[vcd.gtkw.GTKWFlag, Sequence[str], None] = <GTKWFlag.0: 0>, translate_filter_file: Optional[str] = None, translate_filter_proc: Optional[str] = None) → Generator[None, None, None][source]¶Contextmanager for tracing bits of a vector signal.
This allows each individual bit of a vector signal to have its own trace (andtrace configuration).
Parameters: |
|
---|
trace_bit
(index: int, name: str, alias: Optional[str] = None, color: Union[vcd.gtkw.GTKWColor, str, int, None] = None) → None[source]¶Trace individual bit of vector signal.
This is meant for use in conjunction with
trace_bits()
.Parameters: |
|
---|
vcd.gtkw.
make_translation_filter
(translations: Sequence[Tuple[Any, ..]], datafmt: str = 'hex', size: Optional[int] = None) → str[source]¶Create translation filter.
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The returned translation filter string that can be written to a translation filterfile usable by GTKWave.
Parameters: |
|
---|---|
Returns: | Translation filter string suitable for writing to a translation filterfile. |
vcd.gtkw.
decode_flags
(flags: Union[str, int]) → List[str][source]¶Decode hexadecimal flags from GTKWave save file into flag names.
This is useful for understanding what, for example “@802022” means when inspecting aGTKWave save file.
Parameters: | flags – Hexadecimal flags from GTKWave save file; either as an integer orstring with hexadecimal characters. |
---|---|
Returns: | List of flag names |
vcd.gtkw.
spawn_gtkwave_interactive
(dump_path: str, save_path: str, quiet: bool = False) → None[source]¶Spawn gtkwave process in interactive mode.
A process pipeline is constructed such that the contents of the VCD dump file atdump_path are displayed interactively as the dump file is being written (i.e. with
VCDWriter
.The process pipeline built is approximately equivalent to:
The
tail
, shmidcat
, and gtkwave
executables must be found in $PATH
.Warning
This function does not work on Windows.
Note
A child python process of the caller will remain running until the GTKWavewindow is closed. This process ensures that the various other child processesare properly reaped.
Parameters: |
|
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(Redirected from Value Change Dump)
Value Change Dump (VCD) (also known less commonly as 'Variable Change Dump') is an ASCII-based format for dumpfiles generated by EDAlogic simulation tools. The standard, four-value VCD format was defined along with the Veriloghardware description language by the IEEE Standard 1364-1995 in 1996. An Extended VCD format defined six years later in the IEEE Standard 1364-2001 supports the logging of signal strength and directionality. The simple and yet compact structure of the VCD format has allowed its use to become ubiquitous and to spread into non-Verilog tools such as the VHDL simulator GHDL and various kernel tracers. A limitation of the format is that it is unable to record the values in memories.
Structure/syntax[edit]
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.
VCD keywords are marked by a leading $ (but variable identifiers can also start with a $). In general every keyword starts a section which is terminated by an $end keyword.
All VCD tokens are delineated by whitespace. Data in the VCD file is case sensitive.
Header section[edit]
The header section of the VCD file includes a timestamp, a simulator version number, and a timescale, which maps the time increments listed in the value change section to simulation time units.
Variable definition section[edit]
The variable definition section of the VCD file contains scope information as well as lists of signals instantiated in a given scope.
Each variable is assigned an arbitrary, compact ASCII identifier for use in the value change section. The identifier is composed of printable ASCII characters from ! to ~ (decimal 33 to 126). Several variables can share an identifier if the simulator determines that they will always have the same value.
The scope type definitions closely follow Verilog concepts, and include the types module, task, function, and fork.
$dumpvars section[edit]
The section beginning with $dumpvars keyword contains initial values of all variables dumped.
Value change section[edit]
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The value change section contains a series of time-ordered value changes for the signals in a given simulation model. The current time is indicated by '#' followed by the timestamp. For scalar (single bit) signal the format is signal value denoted by 0 or 1 followed immediately by the signal identifier with no space between the value and the signal identifier. For vector (multi-bit) signals the format is signal value denoted by letter 'b' or 'B' followed by the value in binary format followed by space and then the signal identifier. Value for real variables is denoted by letter 'r' or 'R' followed by the data using %.16g printf() format followed by space and then the variable identifier.
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Example VCD file[edit]
The code above defines 7 signals by using $var:
The id is used later on the value change dump. The value change dump starts after $enddefinitions $end and is based on timestamps. Timestamp is denoted as '#' followed by number. On each timestamp the list of signals that change their value is listed. This is done by the value/id pair:
This example will be displayed as
Program To Edit Vcf Files
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See also[edit]
External links[edit]
- IEEE Std 1364-2001 – The official standard for Verilog 2001 (not free).
- Compare VCD – A command-line tool to compare VCD files (licensed under the GPL).
- Verilog::VCD – Perl CPAN software for parsing Verilog VCD files (licensed under the GPL).
- ProcessVCD – Java package for parsing VCD files (licensed under the MIT License).
- PyVCD – Python package that writes Value Change Dump (VCD) files as specified in IEEE 1364-2005 (MIT License).
- Value Change Dump – Explanation of VCD format, with example.
- vcdMaker – Tool (Linux, Windows) for translating text log files into VCD files (MIT License).
- yne/vcd – (Linux, Mac, Windows) CLI to Display VCD files on the terminal (MIT License).
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