Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1993-08-13
1995-05-02
Hudspeth, David R.
Electronic digital logic circuitry
Multifunctional or programmable
Array
371 223, 326 21, H03K 19003
Patent
active
054122600
ABSTRACT:
A structure and a method to implement in-system programming (ISP) and boundary-scan testing in an integrated circuit using the same pins to control both functions. The SDI, SCLK, MODE and SDO connections required for in-system programming and the TDI, TCK, TMS and TDO connections required for boundary-scan testing are multiplexed such that they are provided from the same four pins. An in-system programming enable pin is used to control the multiplexing of these pins. In an alternative embodiment, both in-system programming and boundary-scan testing are performed using the same pins and the same state machine. The test logic architecture specified in IEEE Standard 1149.1-1990 is utilized. To implement the in-system programming instructions, the instruction register of Std. 1149.1-1990 is modified to include private instructions which perform the desired programming functions.
REFERENCES:
patent: 4761768 (1988-08-01), Turner et al.
patent: 4766569 (1988-08-01), Turner et al.
patent: 4833646 (1989-05-01), Turner et al.
patent: 4852044 (1989-07-01), Turner et al.
patent: 4855954 (1989-08-01), Turner et al.
patent: 4857774 (1989-08-01), El-Ayat et al.
patent: 4870302 (1989-09-01), Freeman
patent: 4876466 (1989-10-01), Kondou et al.
patent: 4879688 (1989-11-01), Turner et al.
patent: 4887239 (1989-12-01), Turner
patent: 4896296 (1990-01-01), Turner et al.
patent: 4918641 (1990-04-01), Jigour et al.
patent: 5015886 (1991-05-01), Choi et al.
patent: 5023484 (1991-06-01), Pathak et al.
patent: 5023606 (1991-06-01), Kaplinsky
patent: 5027011 (1991-06-01), Steele
patent: 5072138 (1991-12-01), Slemmer et al.
patent: 5084635 (1992-01-01), Toda et al.
patent: 5105388 (1992-04-01), Itano et al.
patent: 5113093 (1992-05-01), Tashiro et al.
patent: 5225724 (1993-07-01), Scarra et al.
Chan Albert L.
Shankar Kapil
Shen Ju
Tsui Cyrus Y.
Hoffman E. Eric
Hudspeth David R.
Kwok Edward C.
Lattice Semiconductor Corporation
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