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C-element
In Logic gate, digital computing, the Muller C-element (C-gate, hysteresis flip-flop, coincident flip-flop, or two-hand safety circuit) is a small binary sequential logic, logic circuit widely used in design of asynchronous circuits and systems. It outputs 0 when all inputs are 0, it outputs 1 when all inputs are 1, and it retains its output state otherwise. It was specified formally in 1955 by David E. MullerD. E. MullerTheory of asynchronous circuits Report no. 66, Digital Computer Laboratory, University of Illinois at Urbana-Champaign, 1955. and first used in ILLIAC II computer. In terms of the theory of Lattice (order), lattices, the C-element is a semimodular distributive circuit, whose operation in time is described by a Hasse diagram.D. E. Muller and W. S. Bartky"A theory of asynchronous circuits" Int. Symposium on the Switching Theory in Harvard University, pp. 204–243, 1959. The C-element is closely related to the ''rendezvous'' and ''join'' elements, where an input is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ILLIAC II
The ILLIAC II was a revolutionary super-computer built by the University of Illinois Urbana–Champaign, University of Illinois that became operational in 1962. Description The concept, proposed in 1958, pioneered Emitter-coupled logic (ECL) circuitry, pipelining, and transistor memory with a design goal of 100x speedup compared to ILLIAC I. ILLIAC II had 8192 words of core memory, backed up by 65,536 words of storage on magnetic drums. The core memory access time was 1.8 to 2 μs. The magnetic drum access time was 8.5ms. A "fast buffer" was also provided for storage of short loops and intermediate results (similar in concept to what is now called cache (computing), cache). The "fast buffer" access time was 0.25 μs. The word size was 52 bits. Floating-point numbers used a format with seven bits of exponent (power of 4) and 45 bits of mantissa. instruction set, Instructions were either 26 bits or 13 bits long, allowing packing of up to four instructions per memory word. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
