How to set differential CK when using EBD model.

Discussion created by xuezhuan.gu on Aug 25, 2011
Latest reply on Aug 25, 2011 by xuezhuan.gu

I'm using EBD model to simulate RDIMM, but I have a trouble how to set the termination of the differential CK0/CK0# in Hyperlynx 8.1.

In EBD model, there is description about the resistor:


| Since ebd standards do not incorporate correct modeling of differential

| traces CK0/CK0# the differential resistors (R19) are

| assigned as an external component for reference designator. The

| components for the differential resistors are defined in series

| resistor ibis model r_120.ibs. If your simulation tool does not support

| series resistor models please add the differential resistor in the

| simulation setup file in order to get correct results.


| This File uses u68a.ibs file released

| Rev 2.2: 05/24/2010

| This file incorporates package parasitics from the u68aX8_2cob.ebd, released Rev 2.1: 02/26/2010.


| Please select the appropriate speed grade models through [Model Selector]

| for 800Mbps choose *_800 models.


| This EBD represents the typical board with a nominal impedance of 60ohms

| and a dielectric constant of 4.2



How can I do in Hyperlynx 8.1, thanks.