Control of tristate buses during scan test
View Patent ↗A system, method, and apparatus for controlling tri-state drivers are presented herein. During scan testing, a decoder controls the tri-state drivers and prevents more than one tri-state driver from driving a shared resource, regardless of the test patterns shifted into the scan chain. During functional mode, the tri-state drivers are driven by functional enables.
1. A method for testing a circuit, said method comprising:
inputting a test pattern into the circuit;
disabling all but one of a plurality of clients accessing a shared resource, while inputting the test pattern; and
capturing a response.
2. The method of claim 1 , further comprising:
disabling all but another one of the plurality of clients accessing the shared resource, while capturing the response.
3. The method of claim 1 , wherein the plurality of clients comprises a plurality of drivers.
4. A circuit for performing a function, said circuit comprising:
a shared resource;
a plurality of clients connected to the shared resource; and
a testing circuit operably configured to disable all but one of the clients while inputting a test pattern into the circuit.
5. The circuit of claim 4 , wherein the testing circuit is further configured to disable all but another one of the plurality of clients accessing the shared resource, while a response is captured.
6. The circuit of claim 5 , wherein the plurality of clients comprises a plurality of drivers.