Papers by Mohammad Rahimian
A high-throughput, metastability-free GALS channel based on pausible clock method
2nd Asia Symposium on Quality Electronic Design (ASQED), 2010
2nd Asia Symposium on Quality Electronic Design (ASQED), 2010
Synchronization issues such as metastability in multi-clock domain systems have become a big prob... more Synchronization issues such as metastability in multi-clock domain systems have become a big problem, reducing data transmission throughput between domains. In this paper, a high-throughput, metastability-free data transmission channel based on pausible clock method in Globally-Asynchronous Locally-Synchronous (GALS) systems is proposed. This channel can be used as the interconnection of mixed-clock synchronous IP cores without having concerns about their synchronization. We show that the probability of metastability in our design is practically zero; and this without loss of throughput and latency, allowing the transmitter and receiver to operate with their own maximum clock frequency. The proposed channel is simulated in 90nm CMOS process using Predictive Technology Model (PTM) library. Gate delays and power parameters are extracted from Spice simulations and are back annotated into our channel HDL code. The throughput, latency and power are analyzed and compared with existing designs.
Modelling and Simulation in Materials Science and Engineering, 2008
In this paper, the main characteristics of Frank-Read (F-R) sources used in a mechanism-based dis... more In this paper, the main characteristics of Frank-Read (F-R) sources used in a mechanism-based discrete dislocation plasticity (M-DDP) analysis are estimated by employing a recently developed non-singular continuum elastic theory of dislocations. The critical nucleation stress, τ nuc , is determined more accurately because the dislocation core effects are considered precisely by atomistically-informing the dislocation dynamics simulations. The nucleation time is calculated and compared with the previous predictions. The dependence of the drag coefficient of dislocations on dislocation line orientation, which affects the nucleation time and also the shape of the emitted dislocation loop, is considered. In M-DDP simulations, τ nuc used for sources is calculated based on the assumption of an infinite domain. In reality, however, the critical nucleation stress is affected by other F-R sources. It is proposed in this paper that the critical nucleation stress should be modified by considering the effects of other dislocation sources. To this end, τ nuc should be determined for an F-R source in a finite cell with periodic boundary conditions. of the core region, indirectly accounting for the effects of the dislocation core, must be added. Useful discussions about the core cut-off parameters can be found in and .
Universal on-chip communication channel
2010 15th CSI International Symposium on Computer Architecture and Digital Systems, 2010
On-chip communication in mixed-clock systems has become a major issue; especially when asynchrono... more On-chip communication in mixed-clock systems has become a major issue; especially when asynchronous as well as multiple-clock-domain cores are used in a single chip. This paper proposes a new on-chip communication channel which can be used as asynchronous ⇒ synchronous, synchronous ⇒ asynchronous or synchronous ⇒ synchronous (mixed-clock) communication channel, all with the same design. The synchronization issue, i.e. the
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Papers by Mohammad Rahimian