-This paper describes the design and implementation of a high speed GaAs ATM Mux Demux ASIC (AMDA) which is the key element in a high speed ATM AddDrop unit. This unit is used in a new distributed ATM multiplexing-demultiplexing architecture for broadband switching systems. The Add-Drop unit providles a cell based interface between networkshystems operating ait different data rates, the high speed interface being 2.5 Gb/s and the low speed interface being 155/622Mb/s. Self timed FIFOs are used for handling the speed gaps between domains operating at different clock rates, and a Self Timed At Receiver's Input (STARI) interface is used at all high speed chip-to-chip links to eliminate timing skews. The AMDA demonstrated operation above 4 Gb/s (500 MHz clock frequency) witlh an associated power dissipation of 5 W.
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