19-10-2010, 06:01 PM
Applying CDMA Technique to Network-on-Chip
The details of applying a code-division multiple access (CDMA) technique to an on-chip packet switched communication network is described in this article. Here, VHDL is used to implement a packet switched network-on-chip (NoC) that applies the CDMA technique at the RTL level. The globally-asynchronous locally-synchronous (GALS) communication scheme is supported by the chip so developed. a point-to-point connection schemes data transfer latency is reduced by this NoC by sharing the data communication media among multiple users concurrently.
INTRODUCTION
By separating the problem of communicaton from computation, Network-on-chip (NoC) is proposed to solve the on-chip communication problem. To construct an on-chip communication network to perform data transfers among a large number of system components is the major aim of the NoC.
APPLYING CDMA TECHNIQUE TO NOC
In the CDMA technique the data from different senders are encoded
using a set of orthogonal spreading codes At the sending end. different senders encoded signals are added together to transmit htrough a channel, without interfering with each other. normalized autocorrelation value and the cross-correlation value of spreading codes are 1 and 0. This is called the orthogonal property of the spreading code.
At the recieving end, by simply multiplying the received signals with the spreading code used for encoding, the data can be recovered.
CDMA NOC STRUCTURE
The proposed CDMA NoC consists of “Network Node,” “CDMA Transmitter,” and “Network Arbiter". The Network Node connects the functional
IP blocks.
Get the report here:
http://citeseerx.ist.psu.edu/viewdoc/dow...1&type=pdf
