eldo_user

IBIS Models Support in Eldo
IBIS Buffers
2), is picked up from the IBIS file. The MS_In model has a model selector statement in the IBIS
file. The netlist selects the Input_50 model for MS_In.
The package keyword takes the default of 2 because the buffer is instantiated by pin name.
Therefore Eldo will add the package parasitics associated with pin 2 under the [Pin] keyword,
R=0.018 L=0.881n C=0.121p, to the buffer analog input pin. The corner is not specified,
therefore the typical data will be used for this buffer by default. The power keyword is not
specified, therefore Eldo connects the reference voltage sources to the buffer reference ports. In
this case the nodes PC and GC only have the role of enabling you to plot/print the voltage
reference values.
Netlist 3
* make pseudo-differential buffer for pin 3 and pin 4
_IO_out_diff OUTp OUTn d_CTRL
+ file="dummy.ibs" component="Test_Component"
+ pin="3" inv_pin="4"
The above netlist instantiates the pseudo-differential buffer associated with pins 3 and 4. The
non-inverting pin of the buffer is connected to node OUTp, inverting pin to node OUTn, and the
digital input to node d_CTRL. The buffer description is in the IBIS file dummy.ibs located in the
same directory as the netlist. It belongs to the component Test_Component.
The package keyword takes the default of 2 because the buffer is instantiated by pin name.
Therefore Eldo will add the package parasitics associated with pin 3 and 4 under the [Pin]
keyword, R=0.017 L=1.031n C=0.205p, to the buffer analog input pins. The corner is not
specified, therefore the typical data will be used for this buffer by default. The power keyword
is not specified, therefore Eldo connects the reference voltage sources to the buffer reference
ports.
Netlist 4
*connect series buffer between 3 and 4
_IO_ser OUTp OUTn
+ file="dummy.ibs" model="Series1"
The above netlist instantiates the series buffer associated with pins 3 and 4. It is connected to
nodes OUTp and OUTn. The buffer description is in the IBIS file dummy.ibs located in the
same directory of the netlist. The buffer model is Series1. The corner is not specified, therefore
the typical data will be used for this buffer by default.
Note that any series buffer has no package associated with it.
Related Topics
Buffers
Supported Keywords and Sub-Parameters
764
Eldo® User's Manual, 15.3