Hi,

This is definitely asymmetric. No adjacent pairs (except 3 and 4) have equal
cu thickness so you are probably looking at a complete build-up for
fabrication. I agree with Charles, consult your board manufacturer and get
their recommendations.

Best regards,
 
Mario Irigoyen


-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of ert
ert
Sent: Tuesday, August 29, 2006 10:02 AM
To: [log in to unmask]
Subject: [DC] symmentric and asymmentric layer stack up

Hi All,

I got a 10layer stackup as below,

Top  (1/2 oz+1/2 oz)
Inner1--gnd (1 oz)
inner2--signal 1 (1/2 oz)
inner3- pwr (1 oz)
inner4- gnd (1 oz)
inner5- signal 2 (1/2 oz)
inner6- pwr (1 oz)
inner7- signal 3 (1/2 oz)
inner8- gnd (1 oz)
Bottom (1/2 oz+1/2 oz)

if I divide this into two halves and see the prepreg tickness, core
thickness both are equal. But if I look at the copper thickness the
thickness is not balanced on either halves (4.5 oz on upper half and 4
oz on lower half). what issues this could cause in FAB and Assembly?

Can I mark this stackup as asymmentric?

Looking for your suggestions.

Thanks,
Nagaraj.






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