Advances in Computers, Vol. 7 by Franz, Rubinoff, Morris (Editors) Alt

By Franz, Rubinoff, Morris (Editors) Alt

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Data can also go in the other direction through the L-buffer, from the network to program memory. The L-buffer gives the system excellent throughput capability since 32 simultaneous data lines can be maintained to and from the network. Data from exterior bulk storage pass directly into the program memory. 3 Parallel Network The parallel network itself is shown in Fig. 1 1 in which the concepts of Routing, the Broadcast Register, and the L-buffer are illustrated. Routing refers to the various sources of data available to the PE.

It consists of three layers of modules (each similar to Holland’s) arrayed in a rectangular network. The layers are: a program layer in which data and instruction are stored-one word per module; a control layer which decodes instructions; and a computing layer in which arithmetic, logical, and geometrical operations are performed. The layers are identical, with one word of storage in each layer. A direct communication path exists between each of the three modules in corresponding positions in the three layers as shown in Fig.

12. The L-buffer can serve as a parallel broadcast register. 4 Processing Element The processing element is the basic building block of the parallel network computer. To the user, it is a complete computer having a full repertoire of arithmetic and logical operations and its own memory. A block diagram of the PE is shown in Fig. 13. The PE consists of two 24-bit registers ( P and &), a 2-bit Mode State register (MS), a 1-bit Carry Indicator (C), a logical and arithmetic circuitry, and its core memory.

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Advances in Computers, Vol. 7 by Franz, Rubinoff, Morris (Editors) Alt
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