Associative Processor I/O Design and Specification.
Final technical rept. 9 Apr-9 Aug 76,
GOODYEAR AEROSPACE CORP AKRON OHIO
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Detailed inputoutput IO specifications were compiled for the three interface channels that currently exist in the STARAN associative processing computer at RADC 1 buffered IO BIO, 2 direct memory access DMA, and 3 external function EXF. The availability and location of port connections for these channels are included within the IO specifications. A comprehensive philosophy was developed that provides an interface between various external devices and the parallel inputoutput PIO unit. The recommended PIO expansion method uses a daisy-chain approach, where each external device is constrained to repeat all the signal of the PIO channel. The expansion method contains a control channel and four 256-bit-wide data ports. These data ports connect external devices to the PIO unit. The associative arrays also connect to the PIO unit through four existing ports. Since the associative array ports contain intermediate buffer registers, the recommended expansion data ports are not buffered. To minimize the number of cable wires and signal repeaters, the PIO expansion approach uses bi-directional lines and time-multiplexed data transmission. In this way, 32 lines are used to transmit a 256-bit-data word in either direction. A detailed logic design of the recommended PIO expansion philosophy was completed three new PC boards were designed as part of this effort. Author
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