This paper describes a set of 0.8μm CMOS VLSIs developed for shared buffer switches in ATM switching systems.A unit switch,of which the size is 32×32,consists of 8 buffer memory LSIs (BFM-LSIs),2 memory control LSIs (CTRL-LSIs) and 2 commercially available FIFO memory LSIs.Using these VLSIs,the 32×32 switch can be mounted on a printed board.This switch is a shared buffer switch.It achieves buffer memory utilization improvement through the use of buffer sharing among all output ports of the switch and has a large 2 Mbit shared buffer which can save 4,096 cells.As a result,this switch can satisfy the cell loss rate requirements,not only under random traffic conditions but also under burst traffic conditions.The switch has a priority control function to meet the requirements for various media.This switch is useful for multimedia ATM networks.
展开▼
