High-performance asynchronous intra-chip communication link based on a multiple-valued current-mode single-track scheme

Abstract

Figure 1. Channel model in the proposed asynchronous data transfer. Transmitter Receiver Output Input Data Output Input X TM RM (a) Spacer Output Input Output Input X Transmitter Receiver RM TM (b) TM : Transmit Mode , RM : Receive Mode Figure 2. Operation modes: (a)a request mode and (b) an acknowledge mode.Abstract-This paper presents a high-performance asynchronous data-transfer circuit based on a multiple-valued current-mode single-track scheme for on-chip communication.Since one-bit data and control information are represented by using a multi-level signal in the proposed single-track scheme, one-bit data can be transmitted asynchronously using a single wire between modules. The use of current-mode signaling makes the voltage swing on wires reduced, which achieves high-speed data transfer. Moreover, as the number of current sources is reduced by the reduction of wires, it is possible to achieve low power dissipation. Using the proposed circuit, we achieve a throughput of 0.65 Gbps/wires with power consumption of 0.29 mW at 5mm wire length. This presents a 400% increase in throughput, a 57% decrease in power consumption with respect to a conventional asynchronous circuit, using a 90nm CMOS process.

Giga bit per second Differential Scheme for High Speed Interconnect

“…Current mode signaling [6] has been used in this work. As compared to voltage mode signaling, it offers many advantages like small propagation delay, signal integrity, low switching noise, and ability to operate effectively in presence of low supply voltage.…”

“…Depending on the four combinations of serial Data 1 & different currents [6] [7] will flow in transmission line corresponding to each combination. It is shown in Table 1.…”

“…Thus we have a file which gives information about the s-parameters of the 4 talk, signal loss due to skin effect and other high frequency effects are So the polarity of current will be negative as the current levels and will convert current into four different voltage level. The maximum voltage level will be produced by 00 combination and s on the transmission line [6] [7] are as shown below in the figure 16. There are 4 different current levels.…”

Highly Reliable Multiple-Valued One-Phase Signalling for an Asynchronous On-Chip Communication Link

“…Although the asynchronous communication links have been proposed [4]- [8], a large number of wires and communication steps are required for an asynchronous handshake operation, where data is locally synchronized by using a request and an acknowledge signals. To reduce the overhead of the asynchronous operation, high-speed and wireefficient asynchronous communication links based on onephase signalling have been reported [9], [10].…”