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Thu Aug 16 22:42:04 EDT 2018

How expensive is the stack?

3 x 8

After packing:
IOs          15 / 206
GBs          0 / 8
  GB_IOs     0 / 8
LCs          302 / 7680
  DFF        120
  CARRY      37
  CARRY, DFF 5
  DFF PASS   52
  CARRY PASS 14
BRAMs        1 / 32
WARMBOOTs    0 / 1
PLLs         0 / 2


4 x 8

After packing:
IOs          15 / 206
GBs          0 / 8
  GB_IOs     0 / 8
LCs          310 / 7680
  DFF        128
  CARRY      37
  CARRY, DFF 5
  DFF PASS   52
  CARRY PASS 14
BRAMs        1 / 32
WARMBOOTs    0 / 1
PLLs         0 / 2



So it's just the FFs

Basically, stack depth is cheap.  What about width?  Going from 4x8 -> 4x12

That makes a bigger difference.  But it also adds logic for the
memories.


After packing:
IOs          15 / 206
GBs          0 / 8
  GB_IOs     0 / 8
LCs          391 / 7680
  DFF        158
  CARRY      49
  CARRY, DFF 5
  DFF PASS   58
  CARRY PASS 14
BRAMs        16 / 32
WARMBOOTs    0 / 1
PLLs         0 / 2




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