Accelerator和Interface/Controller求教！！

PCI9054AB50BI-------PCI9054, PCI Bus Master I/O  Accelerator
PCI9054-AA50BI------PCI Bus Interface/Controller
PCI9054-AA50PI------PCI Bus Interface/Controller
上面的PCI Bus Master I/O  Accelerator和PCI Bus Interface/Controller 又什么不同啊？在选择芯片的时候怎么考虑啊？大虾指点啊！！

不知道你说的什么,只知道:
field-1 field-2 - field-3 field-4 field-5 field-6
  XXX    XXXX   -    XX      XX      X       X
1\\Device Class     e.g., (PCI)9054-AB50PI
2\\Part Number      e.g.,  PCI(9054)-AB50PI
3\\Device Revision  e.g.,  PCI9054-(AB)50PI    (Base & Metal Layers)                          
4\\Maximum Operating Frequency (in MHz)   e.g., PCI9054-AB(50)PI
5\\Packaging Technology (B=BGA, P=PQFP)
6\\Operational Temperature Range (I=industrial, C=commercial)  



[编辑 -  1/3/04 by  fanchao41]

[编辑 -  1/3/04 by  fanchao41]

PCI9054AB50BI-------PCI9054, PCI Bus Master I/O Accelerator
PCI9054-AA50BI------PCI Bus Interface/Controller
我是想问：
PCI Bus Master I/O Accelerator
和PCI Bus Interface/Controller 有什么不同啊？
也即是Accelerator和Bus Interface/Controller 的不同阿，在功能上？？？？？？