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: 31/135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
33
Replacing the idealized crossbar with a buildable, traditional Banyan network increases the possibility of internal net-
work collisions, as shown in Figure 18. Given a particular Banyan network, one can always find a large class of traf-
fic patterns that will cause many internal collisions. For large Banyan networks, the collision problem is greatly
increased.
To reduce internal collisions in the traffic-dependent Banyan networks, the QRT/QSE network adds a distribution/
randomizing network (shown in Figure 19) that uses a patented intelligent configuration algorithm, known as Evil
Twin Switching. The algorithm (described in
section 2.8.3 “Speedup Factor (SF)” on page 36
) allows lower-bound-
ing the network performance, independent of traffic patterns.
Figure 18. “Large” Distributed Network (Will not Work Well with Banyan Alone)
Figure 19. High-Level QRT/QSE System
Banyan
Input
Buffers
Output
Buffers
Output
Collision
Internal
Collisions
Local
Arbiters
Banyan
Input
Buffers
Output
Buffers
Internal
Collisions
Intelligent
Configuration
Algorithm
and
Randomizer
Local
Arbiters
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