| 摘要 |
A control node (70) for controlling a predetermined function in response to messages transmitted over a communications bus (50) and for responding to a second class of such messages to exercise boundary-scan logic to test the control node (70). The boundary-scan logic is implemented in accordance with ANSI/IEEE Standard 1149.1. The second class of messages include Scan Command messages which contain data for controlling the state of the Test Access Port of the boundary-scan logic, Scan Test Data messages which transmit data to be loaded into the instruction registers or the test data registers of the boundary-scan logic, and Scan Results Request messages which control the node to return the test results over the communications bus (50). <IMAGE> |
