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A method of predicting the wireability of a printed circuit card, or board, containing a mix of several component types, is accomplished with an algorithm which is described in the following.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
69% of the total text.
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Wireability Prediction Algorithm
A method of predicting the wireability of a printed circuit card, or board,
containing a mix of several component types, is accomplished with an algorithm
which is described in the following.
The basis for the algorithm is an estimation method based on a formula for
calculating average wiring length of connections of circuits. For a set of identical
components on a card, the following analysis has been applied in the past.
Given: W = Card width in inches L = Card length in inches Px = Module pitch in
the x-direction Py = Module pitch in the y-direction LPI = Lines per inch S =
Number of card signal layers PPN = Pins per net PPM = Pins per module 1.
Compute number of modules NMOD = INTEGER [ W x L / (Px x Py) ] 2.
Compute average connection length AVCONLEN = 0.375 x (1+0.1 x In NMOD)
(NMOD*1/6) (PX+PY) 3. Compute card wiring capacity CAP = W x L x LPI x S 4.
Compute connections per pin CPP = (PPN - 1)/PPN 5. Compute wiring demand
DEM = PPM x CPP x NMOD x AVCONLEN 6. Compute utilization UTL = 100 x
DEM / CAP
The technique described above is extended to the heterogeneous case by
assuming that the results for each of the modules are linearly independent and
therefore can be superimposed. Given: W = card width in inches L = card length
in inches LPI = lines per inch S = number of card signal layers Px[i] = module
pitch in the x-direction Py[i] = module pitch in the y-direction PPN[i] = pins per net
for type i modules NTYPES = number of...