Patent ID: 8463965

Claim:
An internal Display Port (iDP) interface test method comprising: transmitting test clocks to an iDP sink device; determining whether or not a link clock lock operation in the iDP sink device is successful based on a measurement result of an (Hot Plug Detect (HPD) signal output from the iDP sink device when a clock lock operation for the test clocks is performed; transmitting test data and arbitrary video data to the iDP sink device if the link clock lock operation in the iDP sink device is successful; determining whether or not a symbol lock operation in the iDP sink device is successful based on a measurement result of the HPD signal output from the iDP sink device when the symbol lock operation for the test data and the arbitrary video data is performed; and counting the trigger number of the HPD signal for a given time if the symbol lock operation is successful, comparing the count result with a predetermined reference value, and determining link stability of the iDP sink device based on the result of the comparison.