eldo_user

Eldo Control Language
Statement Overview
Variables
Several simple variable types are available. The simplest types are the number and string types,
which are used to hold a single value, either a number (always a double-precision floating-point
number) or a string. Vectors of scalar numbers and vectors of strings are also available, together
with a set of functions operating directly on vectors. The waveform type is used to represent
waveforms and communicate with Eldo. Finally, a file type is available for ASCII file
manipulations.
All variables have an identifier starting with a letter, or an “_” character, followed by a sequence
of letters, digits, “_” and/or “#”. All variables, without exception, must be given an explicit
initial value. There is no such thing as an uninitialized variable by construction.
All types of variables can be passed as arguments (either input or output) to testbenches and
tasks.
All variables are local to the task in which they are declared.
In this topic:
Variable Declaration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 821
Variable Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 822
Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 823
Complex Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 823
Strings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 824
Vectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 825
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831
Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 833
Predefined Constants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 834
Variable Declaration
Variables are defined at the beginning of a task, before any other statement. It is not permitted to
declare variables inside a for or while loop, or anywhere but at the very beginning of a task
(except if .option restrict_eldo_cl_declarations=0 is specified in the netlist).
Scalar variables containing numbers are similar to (local) .PARAM in regular simulation
syntax.
A scalar variable can hold either a numeric value, a string of characters, a vector of such
numbers or strings, or a file (logical) name. An initial value is mandatory. For example:
set a=1.3 b=2
set s="hello"
Eldo® User's Manual, 15.3 821