Apparatus and method for performing a multi-value polling operation in a JTAG data stream
US7467343B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2004 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Aug 9, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2242
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a test and debug environment using a JTAG protocol to test a target processing unit, apparatus for multi-value polling permits a poll unit, associated with the scan controller, to determine whether one of several possible signal groups is present in the received data stream. The test and debug unit generates a series of numbers, each number corresponding to a preselected signal groups. The corresponding field in the received data stream is decoded to provide a series of output signals, each output signal corresponding to one group. The output signals of the decoder are compared to corresponding numbers of the expected value. When a signal from the decoder unit is found to correspond to one of the selected data number, the poll operation is a success.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.