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routing [2012/07/04 18:27] – created mcmasterrouting [2012/07/04 18:32] mcmaster
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 ====== Cell ====== ====== Cell ======
  
-Because of the way contacts and cell interconnec+Because of the way contacts and cell interconnect the spacing between them can help identify some of the metalization process.  This unfinished wafer (unknown chip) has very little spacing between cells: 
 + 
 +{{:routing:solid_cell_routing.jpg?200|}} 
 + 
 +This indicates that it is likely at least 3M as 2M chips take advantage of spacing between cells to hop wires.
  
  
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 ===== Ad-hoc rings ===== ===== Ad-hoc rings =====
  
-Two more or less parallel wires circle the chip.  Every power rail is hand routed where it needs to go and the rails are interleaved so that they don't need to cross.  Most common with 2M chips.  Example power routing on ST 24C02:+Two more or less parallel wires circle the chip.  Every power rail is hand routed where it needs to go and the rails are interleaved so that they don't need to cross.  Most common with 2M chips.  Example power routing (ST 24C02):
  
 {{:routing:st_24c02_bus.jpg?300|}} {{:routing:st_24c02_bus.jpg?300|}}
 
routing.txt · Last modified: 2013/10/20 14:59 by 127.0.0.1
 
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