Boots – shoes – and leggings
Patent
1982-01-07
1984-07-31
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 1300
Patent
active
044634455
ABSTRACT:
Circuitry is disclosed for allocating requests for demand-shared bus access among a plurality of service requesting ports. During bus contention time, each requesting port synchronously and sequentially applies the digits of its assigned unique priority code to the bus beginning with the most significant digit. After the application of all digits, only the requesting port having the highest code remains in contention and it seizes the bus. A plurality of status flip-flops is provided in each port for generating port parameter bits. The generated parameter bits are applied to the bus as the most significant bits of a dynamic port priority code during contention time. However, the selective application of a mask signal to a mask conductor during contention time causes each requesting port to ignore any parameter bits on the bus as long as the mask signal remains. This returns control of the port preference to any unmasked parameter bits and to the assigned port priority codes.
REFERENCES:
patent: 3796992 (1974-03-01), Nakumura
patent: 3818447 (1974-06-01), Craft
patent: 3983540 (1976-09-01), Keller
patent: 4096571 (1978-06-01), Vandermey
patent: 4209840 (1980-06-01), Berardi
patent: 4281380 (1981-07-01), DeMesa
patent: 4281381 (1981-07-01), Ahuja
patent: 4320452 (1982-03-01), Kempf
Bell Telephone Laboratories Incorporated
Duft Donald M.
Eng David Y.
Springborn Harvey E.
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