1. A method to generate a design for timing circuitry that provides a traveling-wave type timing signal waveform along a path of transmission line nature, comprising:
determining a plurality of regions of the timing circuitry, each region being sized such that a signal delay, along the path, between adjoining ones of such regions is below a particular fraction of a target operating frequency;
generating a design for each of the determined regions of the timing circuitry such that, for each region individually, that region nominally has particular desired characteristics, the designs for the determined regions constituting an entire design;
simulating operation of the entire design;
selectively adjusting the design for at least some of the regions based on a result of the simulating step; and
repeating the steps of simulating and selectively adjusting as appropriate until the result of the simulating step is a desired result.
2. The method of claim 1, wherein the step of determining a plurality of regions includes:
for each region,
dividing perimeters of each region into a number of segments;
approximating lumped transmission line LCR for at least some of the segments; and
determining relevant parameters such that time delays over each segment have a particular relationship to a function of the target frequency and the number of segments for the perimeter of that region.
3. The method of claim 2, wherein the function of the target frequency and the number of segments for the perimeter of that region is the target frequency divided by twice the number of segments.
4. The method of claim 3, wherein the particular relationship is substantial equality.
5. The method of claim 1,
wherein the timing circuitry includes regenerative means distributed along the path to control voltage transitions in the timing signal waveform; and
wherein step the step of determining a plurality of regions includes, for each region,
dividing perimeters of each region into segments; and
determining a lumped capacitance of each segment to be substantially equal to a worst case load capacitance plus loop-to-loop interconnect capacitance plus active delay capacitance of the regenerative means.
6. The method of claim 2, wherein the step of determining a plurality of regions further includes, for unloaded segments, determining a padding capacitance to substantially match the capacitance of the lumped line capacitance.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of evaluating trust of a target web document present in a web environment which comprises a plurality of web documents, the method comprising:
defining a plurality of trust attributes for the target web document, the plurality of trust attributes being categorized in a first category which relates to contents of the web document, a second category which relates to owner of the web document, and a third category which relates to relationships of the web document and certificate authorities;
obtaining trust attribute values of at least some of the trust attributes;
calculating a P value representing a standalone page trust assessment of the target web document based on trust attribute values in the first category;
calculating a Q value representing a standalone page trust assessment of the target web document based on trust attribute values in the second and third categories;
calculating an S value representing a subordinate node assessment, based on a total trust value and a relevance value R of each of a plurality of other web documents linked to the target web document;
calculating a total trust value of the target web document based on the P, Q and S values; and
displaying the calculated total trust value of the target web document to a web user or storing the calculated total trust value of the target web document in a database.
2. The method of claim 1, wherein the trust attribute values for the target web document are provided as metadata.
3. The method of claim 1, wherein the P value is calculated as the ratio of the number of trust attributes in the first category present in the target web document to the total number of trust attributes defined in the first category.
4. The method of claim 1, wherein the step of calculating the Q value includes verifying each trust attribute in the second and third category present in the target web document.
5. The method of claim 1, wherein the relevance value R is calculated based on trust attribute values of the target web document and other web documents linked to the target web document.
6. The method of claim 1, wherein the other web documents are referenced by the target web document, and wherein the S value is calculated by averaging the total trust value of all of the other web documents weighted by the associated relevance values.
7. The method of claim 1, further comprising:
transferring all or some of trust attributes and their values of the target web document to a second target web document.