eldo_user

Eldo can be launched on the Spectre design by entering the following:
eldo -sp spectre_file.sp -i spice_command_file.cir
Simulator Compatibility
Spectre Compatibility Description
In the .wdb output file, the name of the plotted elements are as defined in the Spectre design. In
this example, I(ANOTHERINSTANCE.ARESBAR) is plotted.
Note
By default, every device name or node name is case-insensitive because SPICE language is
being used. Specify -case to parse the netlist in case-sensitive mode. Spectre is casesensitive
by default.
For example, if the Spectre design contains:
aRes n1 n2 resistor r=1k
ares n1 n2 resistor r=2k
Eldo (SPICE) is case-insensitive, so it considers resistor “ares” has been defined twice. Spectre
is case-sensitive so differentiates between “aRes” and “ares.” Run the Spectre to Eldo converter
with the -case argument to enable the differentiation between “aRes” and “ares.”
Spectre Default Constants and Functions
When using Eldo with the command line argument -sp, or if option
USE_SPECTRE_CONSTANT is specified in the SPICE netlist, Eldo understands a number of
Spectre default parameters, constants, and functions as follows:
• Spectre instance parameter trise is handled as an alias to dtemp for all instances.
• Spectre instance parameter perim is handled as an alias to peri for diode instances.
• Spectre default constants and functions as listed in Table 5-5 are allowed:
Table 5-5. Spectre Constants and Functions
Constant/Function Value
m_e 2.7182818284590452354
m_log2e 1.4426950408889634074
m_log10e 0.43429448190325182765
m_ln2 0.69314718055994530942
m_ln10 2.30258509299404568402
m_pi 3.14159265358979323846
m_two_pi 6.28318530717958647652
Eldo® User's Manual, 15.3 183