Patent ID: 8054354

Claim:
A data transfer circuit comprising: at least one data transfer line that transfers digital data; at least one data detecting circuit connected to the at least one data transfer line; a plurality of holding circuits that hold digital values corresponding to input levels and that transfer the digital values to the at least one data transfer line; a scanning circuit that selects a holding circuit from among the plurality of holding circuits; at least one test-pattern generating circuit that generates a predetermined digital value, the at least one test-pattern generating circuit being connected to the at least one data transfer line; at least one test-column scanning circuit that selects the at least one test-pattern generating circuit; and a start-pulse selecting circuit that controls starting of the scanning circuit and starting of the at least one test-column scanning circuit, wherein the start-pulse selecting circuit has a function of transferring the predetermined digital value to the at least one data transfer line by activating the at least one test-pattern generating circuit, and wherein the predetermined digital value is transferred across portions of the data transfer line that are adjacent the plurality of holding circuits.