eldo_user

Eldo Netlist Setup
Merging Instances in Parallel
• -queue in the Eldo Reference Manual
Merging Instances in Parallel
By default, Eldo merges instances connected in parallel into a single instance. The parallel
instances must have the same set of parameters, and follow each other consecutively.
The multiple instances are reduced into a single instance by Eldo with the M parameter, for
example:
X1 1 2 FOO A=1 B=1
X2 1 2 FOO A=1 B=1
X3 1 2 FOO A=1.0 B=1
X4 1 2 FOO A=1 B=1
Here, X3 remains as it is because the character string for A does not match, X4 remains as it is
because it does not follow the other instances to be merged (X3 has broken the merge
sequence). Merging is done for X instances X1 and X2; they will be replaced by:
X1 1 2 FOO A=1 B=1 M=2
An example showing the merging of parallel instances with different instances between:
X1 A B INV1 W=0.8U L=0.35U
xr1 B 0 RES
X2 A B INV1 W=0.8U L=0.35U
xr2 B 0 RES
Merging is done for X instances X1 and X2, and also X instances xr1 and xr2. They will be
replaced by:
X1 A B INV1 W=0.8U L=0.35U M=2
xr1 B 0 RES M=2
This behavior applies to:
• Resistors
• Diodes
• BJTs
• MOSFETs
158
Eldo® User's Manual, 15.3