[IBIS] EBD file syntax

 

Dear expert,

I am trying to describe the following situation in an EBD file: a signal
net that goes from a die pad to a package pin A9. Physically, this
signal net consists of two traces. Each trace is on a different layer
and they are connected together by a via which is modeled as a small
capacitor of value c3 to ground. The die

pad and the package pin are modeled by a series L and a grounded C. 

My EBD file attempt is depicted as follows

 

[Path Description] SIGNAL_NAME

Pin A9

Len = 0            L = l1 C = c1               /

Len = length2   L=l2   C = c2    R=r2     /

Len = 0                     C = c3                /         <== Allowed
? 

Len = length4  L=l4    C = c4    R=r4     /

Len = 0           L = l5  C = c5                /

Node DIE.5085      

 

I have 2 questions:

1. About the representation of the capacitance c3 in the EBD file, do I
violate any EBD file specification by doing this ?

   Assuming the specification allows it, would the capacitance c3 be
interpreted as grounded or in-series  ?  

2. If the representation of the capacitance c3 as above is not allowed,
can I take out the offending line and the rest is still permitted ?

   In other words, there are still two traces with an electrical
discontinuity connecting them as follow:

[Path Description] SIGNAL_NAME

Pin A9

Len = 0            L = l1 C = c1               /

Len = length2   L=l2   C = c2    R=r2     /

Len = length4  L=l4    C = c4    R=r4     /

Len = 0           L = l5  C = c5                /

Node DIE.5085      

 

Thank you much,

Nam 


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