Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Off-Chip Driver Delay Measurement Using Recirculating Loops

IP.com Disclosure Number: IPCOM000047886D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Gaitanis, F: AUTHOR [+2]

Abstract

Using recirculating loops, determination of off-chip driver delays can be accomplished by measuring the period of signals in the loops. As illustrated in the figure, we want to determine the off-chip driver delay at both delay points DELAY1 and DELAY2. This is done by measuring the period of signals in different paths of the circuit. By selecting different paths, using the static control lines A, B and C, we obtain period measurements.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 2

Off-Chip Driver Delay Measurement Using Recirculating Loops

Using recirculating loops, determination of off-chip driver delays can be accomplished by measuring the period of signals in the loops. As illustrated in the figure, we want to determine the off-chip driver delay at both delay points DELAY1 and DELAY2. This is done by measuring the period of signals in different paths of the circuit. By selecting different paths, using the static control lines A, B and C, we obtain period measurements. The measurement equations are as follows (where Ton is "turn-on delay" and Toff is "turn-off delay" of the indicated circuit): Path 1: A=1; B, C=0 Ton (&I1) + Toff (D1) + Toff (T+R1) + Ton (&I2) + Toff

&I3) + Ton (&I4) + Toff (&I1) + Ton (D1) + Ton (T+R1) +

Toff (&I2) + Ton (&I3) Toff (&I4) = P1 Path 2: A, C=0; B=1

Ton (&I1) + Toff (D1) + Toff (R2) + Ton (&I5) + Toff

&I3) + Ton (&I4) + Toff (&I1) + Ton (D1) + Ton (R2) + Toff

(&I5) + Ton (&I3) + Toff (&I4) = P2 Path 3: A, B=0; C=1

Ton (&I7) + Toff (D*) + Toff (R3) + Ton (&I6) + Toff

(&I3) + Ton (&I4) + Toff (&I7) + Ton (D*) + Ton (R3) + Toff

(&I6) + Ton (&I3) + Toff (&I4) = P3 Now activate both paths 1 and 3: Path 4: A, C=1; B=0 Ton (&I7) + Toff (D*) + Toff (R3) + Ton (&I6) + Toff

(&I3) + Ton (&I4) + Toff (&I1) + Ton (D1) + Ton (T+R1) +

Toff (&I2) + Ton (&I3) + Toff (&I4) = P4 Now activate both paths 2 and 3: Path 5: A=0; B, C=1 Ton (&I7) + Toff (D*) + Toff (R3) + Ton (&I6) + Toff

(&I3) + Ton (&I4) + Toff (&I1) + Ton (D1) +...