ASIC Port Mapping

6500-1#show interface capabilities module 2 

    balababababaab

  Link Debounce Time:    yes
  Ports-in-ASIC (Sub-port ASIC) : 1-24 (1-12)
  Remote switch uplink:  no

  balbababaa

4500-1#show platform mapping ports interface gigabitEthernet 3/1
Interface  Gigaport  Phyport  Aggport    PimPhyport
Gi3/1      23        185      1          0 

3120X-1#sh platform pm if-numbers

interface gid  gpn  lpn  port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Gi1/0/1   1    1    1    1/6  1    1    1    local     Yes     Yes

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_presentation09186a0080161372.pdf

http://networking.ventrefamily.com/2010/08/asic-to-port-mappings.html