Built-in scan chains in the VLSI are utilized for experimental tests and proven to be very useful for SET evaluation. The specially designed test chip is developed and tested to find the relation between errors' distribution and clock tree structures. Error count per event (EPE) is proposed ...
Leakage sources and possible solutions in nanometer CMOS technologies IEEE Circuits and Systems Magazine (2005) V. Adler et al. Repeater insertion to reduce delay and power in RC tree structures IEEE Asilomar Conference on Signals Systems and Computers (1997) J. Cong et al. Simultaneous buffer an...
A symmetric structure such as an H-tree is often utilized in global clock networks [319], as shown in Figure 10-15. The most attractive characteristic of symmetric structures is that the clock signal ideally arrives simultaneously at each leaf of the clock tree. Due to several reasons, howeve...
In prior art the most significant bit and some subset of the input register bit outputs are fed back to bit zero (the least significant or first bit) through an XOR (exclusive OR gate) tree. The larger the number of such feedbacks, the more gate delay time it takes to push them throug...
tree capacitance, we multiply an empirical constantk(e.g., 1.75 for H-tree); the wirelength of premesh tree is almost proportional to the size of mesh grid, as shown in Fig.12. Functional simulation at earlier design stage provides the gating probability. If\(\alpha _{i}\)s are ...
A test chip prototype is designed and fabricated in 65 nm CMOS process (the chip die photo shown in Fig. 1b). The test chip includes three driver- less clock distribution structures as a form of metal mesh, clamper circuits for protection, D-flipflop-based active loads, an H-tree-based...
al, "A CMOS 500 Mbps/pin synchronous point to point link interface", IEEE, 1994 Symposium on VLSI Circuits Digest of Technical Papers, pp. 43-44, June, 1994. FIGS. 4 and 5 show examples of structures of the PDVC and the VCD (that have no relation with the Reference 2), ...
theprocessvariationbecomesanimportantfactorinthedesignofclockdistributionnetworksindeepsub-microntechnology,theportionoftheclockskewintroducedbytheprocessvariationsonthewirewidthandtheclockbuffersizecannolongerbeignored.Hybridstructures,whichconsistsofbothtreeandmeshstructures,aremoretolerantManuscriptreceivedOctober26,...
considerable load to the clock driver. Clock tree structures can be implemented on-chip to minimize clock skew among registers. However, the base trunk clock driver must be capable of driving this clock tree structure and, as a result, a buffer delay of several nanoseconds is typically incurred...
2.2. Clock Tree Topology Many guidelines and algorithms have been introduced for designing balanced power efficient clock distribution trees in synchronous integrated circuits [2–6]. Many different clock tree topologies are used, ranging from asymmetric structures to symmetric trees, such as H-trees ...