eldo_user

IBIS Models Support in Eldo
Example 1—Single-Ended Tx-Rx System
_IO_Rx in d_receive
+ file="tx_rx.ibs"
+ component="transceiver"
+ model="IN"
Instantiates an IBIS input buffer Rx with input connected to in and its digital output connected
to d_receive. The input buffer is located in the tx_rx.ibs IBIS file within the transceiver
component.
Rterm d_receive 0 1e6
Connects a 1MΩ resistor between the digital output d_receive of the input buffer and ground.
This has no impact on the results but avoids having a node with less than two connections.
.param VHI=1.0
.param VLO =0.0
.param TDELAY=0
.param TRISE=10p
.param TFALL=Trise
.param TSAMPLE=5n
vstim d_drive 0 pattern 1 0 0 10p 10p 5n 0 1 R
Instantiates the stimulus vstim for the system. The source is connected between the nodes
d_drive and ground. It is defined using the pattern function with high voltage level of 1V, low
voltage level of 0V, 0 starting delay time, 10ps rise and fall times, 5ns sample time, and finally
it periodically alternates between 0 and 1.
The next part of the netlist specifies the simulation control directives indicating what type of
simulation Eldo should perform on the circuit.
.tran 10p 20n
Specifies a transient analysis be performed lasting 20ns with a plotting increment of 10ps.
.option step=10p
Imposes a time step of 10ps.
.plot tran v(d_drive) v(out) v(in) v(d_receive)
Specifies voltage/time plots of the voltages at nodes out, d_drive, in and d_receive.
Eldo® User's Manual, 15.3 791