PROCESSOR CONSTITUTED TO RECEIVE DIGITAL SIGNAL, AND METHOD OF DETERMINING QUALITY OF RECEIVED DIGITAL SIGNAL (DYNAMIC DETERMINATION OF SIGNAL QUALITY IN DIGITAL SYSTEM)

摘要

PROBLEM TO BE SOLVED: To provide a reception processor that is constituted, using a normal (operation) path and a testing path. SOLUTION: The test path is constituted in parallel to the normal path. The test path simulates the data same to that of the normal path as an input to be received, and the test path has an individual voltage reference Vref_testapplied in a test input buffer. The same data input into the normal path is also input to the test buffer. The output from the test buffer is input to a test latch. A clock signal supplied to the test latch is a variable clock signal, capable of skewing selectively the clock signal. The output from the test latch is compared with the output from a normal latch, and the difference between the two output signals defines errors in a specified voltage/clock-skew combination. COPYRIGHT: (C)2007,JPO&INPIT