Patent ID: 6616256
Filing Date: 2003-09-09
Classification: B41J,G01R

Abstract:
An ink jet print head integrated circuit for receiving print data related to an image to be printed, and for receiving test point data for testing internal logic nodes of the circuit, the circuit comprising:x number of switching devices, each having: a serial input, a test point input, and a switch output coupled to the serial input when in a first state, and coupled to the test point input when in a second state; n number of bit registers, each having a data input and a data output, the data input of x number of the bit registers coupled to the switch output of a corresponding one of the x number of switching devices; a serial print data input for receiving a serial string of bits of the print data; x number of test points coupled to the test point inputs of the x number of switching devices, the x number of test points for receiving x number of parallel bits of the test point data; and a test data output coupled to the data output of an nth of the n number of bit registers, the test data output for outputting a serial string of the x number of bits of the test point data, where x is less than or equal to n.