eldo_user

IBIS Models Support in Eldo
IBIS Examples
IBIS Examples
A number of example files are provided to illustrate using IBIS in Eldo. The example files are
available in your installed directory: $MGC_AMS_HOME/examples/ibis/
Example 1—Single-Ended Tx-Rx System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 790
Example 2—Pseudo-Differential Tx-Rx System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 792
Example 3—Package Parasitics Cross Talk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 794
Example 4—Simultaneous Switching Output Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 796
Example 1—Single-Ended Tx-Rx System
Netlist file: single_tx_rx.cir
IBIS file: tx_rx.ibs
This example deals with a simple arrangement of a single-ended output buffer (Tx),
transmission line, and a single-ended input buffer (Rx). This arrangement can be used for
transmission line analysis mismatch as well as to assure that the Rx correctly recognizes the
logic associated with the received signal levels.
Figure 17-18. Single-Ended Tx-Rx System
The transmission line has characteristics: impedance Z0=50Ω and signal delay TD=0.2ns.
Netlist Explanation
_IO_Tx out d_drive
+ file="tx_rx.ibs"
+ component="transceiver"
+ model="OUT"
The above lines instantiate an IBIS output buffer Tx with output connected to out and digital
input connected to d_drive. The output buffer is located in the tx_rx.ibs IBIS file within the
transceiver component.
TL out 0 in 0 Z0=50 TD=0.3ns
Instantiates an ideal transmission line connected between the nodes out and in with ground
reference. The transmission line has 50 Ω characteristics impedance and 0.3ns time delay.
790
Eldo® User's Manual, 15.3