Enhanced embedded logic analyzer
US6247147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1998 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Nov 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F30/331
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Embedding a logic analyzer in a programmable logic device allows signals to be captured both before and after a trigger condition (breakpoint). A logic analyzer embedded within a PLD captures and stores logic signals. It unloads these signals for viewing on a computer. Using an electronic design automation (EDA) software tool running on a computer system, an engineer specifies signals of the PLD to be monitored, a breakpoint, total number of samples to be stored, number of samples to be captured after the breakpoint occurs, and a system clock signal. The EDA tool automatically inserts the logic analyzer into the electronic design of the PLD which is compiled and downloaded to configure the PLD. Using an interface connected between the PLD and the computer, the EDA tool commands the embedded logic analyzer to run. Signals are stored continuously while running in a ring buffer RAM memory. Once the breakpoint occurs, more samples are captured if desired, in addition to those signals captured before breakpoint. The EDA tool directs the logic analyzer to unload the data from its capture buffer for display on a computer. The breakpoint and sample number can be changed without recompiling…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.