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Input and Output Circuit Block Delay Measurements

IP.com Disclosure Number: IPCOM000047887D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Gaitanis, F: AUTHOR [+2]

Abstract

This measurement technique uses recirculating loops to measure block delays of an input or output (receiver or driver). A problem is encountered in using recirculating loops for I/O block delay measurements because a threshold delta exists between most receiver inputs and driver inputs. However, if a fast-changing voltage signal is used as an input to both receiver and driver, this delta can be made small enough to be ignored. This fast-changing signal is achieved by correctly choosing the value of R. The equations for the recirculating loop are as follows, where Ton is "turn-on delay" and Toff is "turn-off delay" of the circuit in parentheses.

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Input and Output Circuit Block Delay Measurements

This measurement technique uses recirculating loops to measure block delays of an input or output (receiver or driver). A problem is encountered in using recirculating loops for I/O block delay measurements because a threshold delta exists between most receiver inputs and driver inputs. However, if a fast-changing voltage signal is used as an input to both receiver and driver, this delta can be made small enough to be ignored. This fast-changing signal is achieved by correctly choosing the value of R. The equations for the recirculating loop are as follows, where Ton is "turn-on delay" and Toff is "turn-off delay" of the circuit in parentheses. A) Static control lines A=1 B=C=0
Ton (HPAI) + Toff (D) + Toff (R) + Ton (AI) + Toff (AI)

Ton (AI) + Toff (HPAI) + Ton (D) + Ton (R) + Toff (AI)

Ton (AI) + Toff (AI) + Ton (delay) + Toff (delay) = P1 B) Static control lines B=1 A=C=0
Ton (HPAI) - T(tD-tR)* + Toff (R) + Ton (AI) + Toff (AI)

Ton (AI) + Toff (HPAI) + T(tR-tD)* + Ton (R) + Toff (AI)

Ton (AI) + Toff (AI) + Ton (delay) + Toff (delay) = P2 C) Static control lines C=1 A=B=0
Ton (HPAI) + Toff (AI) + Ton (AI) + Toff (AI) + Ton (AI)

Toff (HPAI) + Ton (AI) + Toff (AI) + Ton (AI) + Toff (AI)

Ton (delay) + Toff (delay) = P3 D) Static control lines A=B=1 C=0 Ton (HPAI) - T(tD-tR)* + Toff (R) + Ton (AI) + Toff (AI)

Ton (AI) + Toff (HPAI) + Ton (D) + Ton (R) + Toff (AI)

Ton (AI) + Toff (AI) + Ton (delay) + Toff (delay) = P4...