参数资料
型号: PM73488-PI
厂商: PMC-SIERRA INC
元件分类: 数字传输电路
英文描述: 5 Gbit/s ATM Switch Fabric Element
中文描述: ATM SWITCHING CIRCUIT, PBGA596
封装: EPBGA-596
文件页数: 30/135页
文件大小: 1735K
代理商: PM73488-PI
PMC-Sierra, Inc.
PM73488 QSE
L
PMC-980616
Issue 3
5 Gbit/s ATMSwitch Fabric Element
Released
Datasheet
32
2.8.1
Network Philosophy
Given current technology, to scale through 160 Gbps, a network must be distributed and use buffers at the network
inputs and outputs. In an ideal world, crossbars of any arbitrary size could be built to provide connectivity for the net-
work inputs and outputs. Additionally, there would be a central “brain”, or global arbiter, to control the input buffers
and schedule cells optimally for routing in the network, as shown in Figure 16.
Unfortunately, given real constraints, it is not possible to have a global arbiter wired to each input that has knowledge
of all cells in the system, and can quickly make optimal decisions about routing. Thus, each input must make deci-
sions using knowledge local to its buffers. This results in the possibility of collisions at the network outputs, even
though it is a “perfect” crossbar, as shown in Figure 17.
Figure 16. Ideal Distributed Network
Figure 17. More Realistic Distributed Network
“Perfect
Crossbar”
Input
Buffers
Output
Buffers
Global
Arbiter
“Perfect
Crossbar”
Input
Buffers
Output
Buffers
Local
Arbiters
Output
Collision
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