Browse Prior Art Database

High Order Zero Suppression

IP.com Disclosure Number: IPCOM000092437D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Deskevich, S: AUTHOR [+3]

Abstract

High-order zeros, generated by a subtract operation and stored in a serial-by-bit-by-digit delay line, are suppressed. A sequential latch configuration is used to detect a zero, tag the zero in the delay line with a marker bit, and determine if a significant digit exists in a higher order digit position than the tagged zero.

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High Order Zero Suppression

High-order zeros, generated by a subtract operation and stored in a serial- by-bit-by-digit delay line, are suppressed. A sequential latch configuration is used to detect a zero, tag the zero in the delay line with a marker bit, and determine if a significant digit exists in a higher order digit position than the tagged zero.

If no significant digit is found above the tagged zero, on the next revolution of the delay line all digits starting with the tagged zero are removed by inhibiting regeneration. If a significant digit is found, the tag is removed from the tagged zero on the next revolution. A zero search is started from that point in the field. This process is repeated until either a high-order zero is found or a significant digit is detected in the high-order digit position.

Zero search latch 10 is set at D5 time during a subtract operation by And 12 through Or 14. Coincidence of zero search latch 10 and the detection of a zero without tag set zero detect latch 16. A zero tag is set in the delay line field by And 20 in response to latch 10 on and zero detect latch 16 on.

If a significant digit is detected And 22 resets latch 10. This means all zeros previously tagged are not high-order zeros. Another revolution is required to remove the tags from these zeros. This is done by detecting the tagged zero which sets latch 10 and through And 24 removes the zero tags.

The first zero above the detected significant digit sets latch 16 aga...