High Performance Advanced P-OCI Crossbar with PaCC Codec

Abstract

On-chip communications profoundly impact the overall area, performance and power consumption of modern System on Chips. Developing an efficient high performance on chip interconnects has been of paramount importance for the parallel and high performance computing technologies. Network on Chips are the most scalable interconnection paradigm that is capable of addressing various application needs and meet different performance requirements. Overloaded CDMA is a well known medium access technique deployed in wireless communication to increase the interconnect capacity. The Walsh spreading codes enables adding more number of non orthogonal spreading codes to increase the interconnect capacity. In this paper, a hybrid encoder used in the crossbar can develop both the orthogonal and nonorthogonal spreading. I. INTRODUCTIONSystem on Chip integrates several intellectual property (IP) blocks into a single chip. All of these IPs need to communicate in the Gbps range. So the on-chip communication requirements for these systems are very demanding. The IP blocks must comprise an interconnection architecture and several interfaces to connect the peripheral devices. The interconnection architecture includes many physical interfaces and communication mechanisms. On-chip data transfer affects the area, performance and the power utilization of the System on Chips. Developing an suitable high performance on-chip interconnect architecture has been of supreme significance while considering the high speed computing technologies. Network on Chips provide a way to prevail over the restrictions inherent in regular bus based interconnection schemes and offers several benefits like high throughput, lower energy dissipation, flexible scalability and design reusability. In the case of Network on Chips , data from the routers are considered as several packets and on -chip processing elements are examined as network nodes which are interconnected via routers and switches. A crossbar is one of the most important component of the NoC physical layer. It is a shared communication medium which helps in the exchange of packets. Time Division Multiple Access (TDMA), Space Division Multiple Access (SDMA) and Code Division Multiple Access (CDMA) are the foremost resource allocating techniques utilized by the existing network on-chip crossbars. In the case of CDMA communication each transmitreceive pairs is assigned a distinctive bipolar spreading code. In the communication channel all the data from the transmitters are added. The ordinary CDMA systems use Walsh -Hadamard codes to facilitate the sharing of medium [9]. The spreading codes that used in normal CDMA communication systems are mostly orthogonal and it allows the CDMA receiver to accurately decode the sum from the channel. Multiple Access Interference (MAI) may occur if any additional codes were added. The supreme number of users in the CDMA based communication system may limited because of the Multiple Access Interference problem. Overloaded CDMA can be used to intensify the numbe...