[SI-LIST] Lossy Line Simulation DDR Signals and HSPICE netlist generation
- From: "Venkat" <venkat@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 25 Sep 2006 16:09:28 +0530
Hi all,
I am doing lossy line simulation using IBIS models in Hyperlynx
(Signal integrity tool from mentor graphics). When I generate the HSPICE
compatible netlist for the same net using two different drivers i.e.
PC256DDR.ibs and the other one is 512MDDR.ibs(Device is NT5DS32M16BT).In
both the cases the transmission line parameters are same( Same trace
parameters).But when I observe the Spice file I am getting different ?W?
parameters and different inductance values. The following are the two lists
of parameters what I am getting.
For 512 MB DDR
W001 N=1 100 0 101 0 RLGCmodel=Model_W001 L=0.0141955
MULTIDEBYE=1
T002 100 0 103 0 Z0=4.956034e+001 TD=2.334574e-011
CV001 100 0 2.489e-014
W003 N=1 104 0 103 0 RLGCmodel=Model_W003 L=0.0395297
MULTIDEBYE=1
W004 N=1 105 0 106 0 RLGCmodel=Model_W004 L=0.0019117
MULTIDEBYE=1
RN1317_3 104 105 33
W005 N=1 102 0 107 0 RLGCmodel=Model_W005 L=0.00305359
MULTIDEBYE=1
RN1305_1 101 102 33
TP001 108 0 109 0 Z0=6.666317e+001 TD=1.588583e-010
T006 108 0 106 0 Z0=4.956034e+001 TD=2.334574e-011
CV002 108 0 2.489e-014
TP002 107 0 111 0 Z0=6.969321e+001 TD=4.878524e-011
CV003 103 0 2.489e-014
CV004 106 0 2.489e-014
For 256 MB DDR
W001 N=1 100 0 101 0 RLGCmodel=Model_W001 L=0.0162919
MULTIDEBYE=1
W002 N=1 100 0 103 0 RLGCmodel=Model_W002 L=0.0413441
MULTIDEBYE=1
CV001 100 0 4.979e-014
W003 N=1 104 0 105 0 RLGCmodel=Model_W003 L=0.0055405
MULTIDEBYE=1
RN1317_3 103 104 33
W004 N=1 102 0 106 0 RLGCmodel=Model_W004 L=0.0119705
MULTIDEBYE=1
RN1305_1 101 102 33
TP001 105 0 108 0 Z0=6.666317e+001 TD=1.588583e-010
CV002 105 0 4.979e-014
Pls let me know why there is a difference in the parameters list even though
the transmission line characteristics are same.
Venkat V.S.Babu.K
Cg-Coreel Programmables Pvt Ltd
Bangalore
India
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