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Cryogenic 1's Counter

IP.com Disclosure Number: IPCOM000098081D
Original Publication Date: 1961-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Plonsky, AT: AUTHOR

Abstract

The counter determines the number of 1's in either a portion of an n-bit register or a complete register. The cryotron circuitry is based on logic which causes switching from an ODD to an EVEN line for each pair of 1's, 2's, etc., detected. Such pair detection is effected by a series of 1's parity gates. The inputs from the n-bit register are applied at the left. Strobe pulses are applied to the Strobe Lines at the top and the output binary count is derived at the bottom.

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Cryogenic 1's Counter

The counter determines the number of 1's in either a portion of an n-bit register or a complete register. The cryotron circuitry is based on logic which causes switching from an ODD to an EVEN line for each pair of 1's, 2's, etc., detected. Such pair detection is effected by a series of 1's parity gates. The inputs from the n-bit register are applied at the left. Strobe pulses are applied to the Strobe Lines at the top and the output binary count is derived at the bottom.

The Sense 1's Parity section determines if the number of 1's in the n-bit register is odd or even. The number of times there is switching from ODD to EVEN is indicative of the number of pairs of 1's. The Sense 2's Parity section ascertains if the number of pairs of 1's (2's) is odd or even. The number of times there is switching from ODD to EVEN is indicative of the number of pairs of 2's. The Sense 4's Parity section determines if the number of pairs of 2's (4's) is odd or even. The size of the n-bit register determines the extent of the cryotron circuitry.

Currents on either a ""1 or ""0 input line drive their associated cryotrons to their respective resistive states. With regard to the 5-bit register of bistable elements, assume all bits are each in the ""1 state. Thus cryotrons 2, 8, 10, 16, 18, 24, 26, 32 and 36 are driven resistive. Upon application of Strobe Line pulses, current appears on lines 3, 5 and 7. Current on line 3 flows through a superconductive path that...