System and method for performing predictable signature analysis

A graphics system comprising:

• a first component configured to output data, wherein the data includes requested data and unrequested data;
• a second component configured to request data from the first component, wherein the second component includes a signature analysis register configured to capture data;
• a bus coupling the first component and the second component and configured to transmit data between the first component and the second component;
• and
• a controller coupled to receive the requested data and the unrequested data output by the first component, wherein the controller configured to receive the data output by the first component in response to the second component's request, wherein the controller is configured to replace the unrequested data with predictable data and to output the predictable data and the requested data, wherein the signature analysis register is configured to capture the predictable data and the requested data.

A method of performing signature analysis, the method comprising:

• a requesting device requesting data;
• a providing device providing data in response to said requesting, wherein the data comprises requested data and unrequested data;
• replacing the unrequested data with predictable data, wherein the predictable data has a predictable value;
• and
• a signature analysis register in the requesting device capturing the predictable data and the requested data.