| Summary: | 碩士 === 國立交通大學 === 電子研究所 === 84 === B-ISDN is expected to provide versatile communication service
based on ATMtechnology. The capability of multicast is important
to support many servicessuch as VOD (video-on-demand), video
conference, LAN emulation, etc. In thisthesis, we present a new
architecture to support multicast virtual connectionin an ATM
switch. This architecture is designed to achieve high
throughput,efficiency and flexibility. By queuing input
multicast cells in multicastqueues, each multicast cell occupies
only one-cell buffer space, this archi-tecture can achieve very
low cell loss probability. These multicast queues also share the
same buffer memory with all other unicast queues, the utili-
zation of buffer memory is very efficient. And the structure of
buffer memory is the same with that for unicast, no special
design is needed. The multicast table is also shared by all
ports to improve table utilization. Modular designenables the
flexibility of table size, multiple table chipscan be cascaded
to construct a larger multicast table to meet system
requirement. Because the multicast table is shared by all ports,
short translation delay is critical inthe improvement of
throughput. We also present a PLL clock generator with on-chip
RC filter, which can generate an internal clock of quad
frequency, that will be integrated to raise the processing
speed.
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