发明名称 |
Led printhead and driver chip for use therewith having boundary scan test architecture |
摘要 |
A non-impact printhead having a plurality of driver IC chips and and a plurality of recording elements such as LEDs. Each driver IC chip includes a plurality of current-carrying channels that are operative for carrying current to respective recording elements on the printhead and a control for controlling operation of the driver. The control includes a circuit that provides a test circuit interface which includes (a) a test access port for input of update command signals and clock inputs to the test circuit; (b) a test data input terminal for inputting test data and control data into the chip; (c) a plurality of registers connected to the test data input terminal with at least one of the registers storing control data for controlling operation of the driver; (d) a test data output terminal for outputting test data and control data from the chip to an adjacent chip; and (e) a selector connected to the registers and the test data output terminal for selecting test and control data for output from the test data output terminal.
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申请公布号 |
US5859657(A) |
申请公布日期 |
1999.01.12 |
申请号 |
US19950581025 |
申请日期 |
1995.12.28 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
DONAHUE, MICHAEL JOHN;FLEMING, PAUL JOHN;FOX, TRACY;KELLY, EDWARD MICHAEL;MATTERN, MICHAEL WILLIAM;PETRUZELLI, CARL MICHAEL |
分类号 |
B41J2/44;B41J2/45;B41J2/455;G01R31/28;G01R31/3185;G06F11/22;G06K15/10;G06K15/12;(IPC1-7):B41J2/47;B41J2/435 |
主分类号 |
B41J2/44 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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