Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Patent
1996-09-10
1999-12-14
Sheikh, Ayaz R.
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
326 41, 326101, G06F 1300, G06F 738, H01L 2500
Patent
active
060031077
ABSTRACT:
Circuitry for providing external access to signals that are internal to an integrated circuit chip package. A plurality of N:1 multiplexers are physically distributed throughout the integrated circuit die. Each of the multiplexers has its N inputs coupled to a nearby set of N nodes within the integrated circuit, and each of the multiplexers is coupled to a source of select information operable to select one node from the set of N nodes for external access. Each of the multiplexers has its output coupled to an externally-accessible chip pad. The integrated circuit is a microprocessor, and the source of select information may include a storage element. If so, additional circuitry is provided for writing data from a register of the microprocessor to the storage element using one or more microprocessor instructions. Each multiplexer may be coupled to a different source of select information, or all multiplexers may be coupled to the same select information. Moreover, a fixed set of interconnect traces may be provided to couple a fixed set of nodes to an additional set of externally-accessible chip pads. One or more M:1 multiplexers may also be provided, having their M inputs coupled to M different outputs of the N:1 multiplexers. Each of the M:1 multiplexers may be coupled to a second source of select information. Preferably, the outputs of the M:1 multiplexers will be coupled to a circuitry for facilitating debug and performance monitoring of the integrated circuit.
REFERENCES:
patent: 3947823 (1976-03-01), Padegs et al.
patent: 4303990 (1981-12-01), Seipp
patent: 4425643 (1984-01-01), Chapman et al.
patent: 4431928 (1984-02-01), Skokan
patent: 4433413 (1984-02-01), Fasang
patent: 4446514 (1984-05-01), Brown et al.
patent: 4491907 (1985-01-01), Koeppen et al.
patent: 4500993 (1985-02-01), Jacobson
patent: 4598385 (1986-07-01), Kessels et al.
patent: 4622669 (1986-11-01), Pri-Tal
patent: 4674089 (1987-06-01), Poret et al.
patent: 4841232 (1989-06-01), Graham et al.
patent: 4868822 (1989-09-01), Scott et al.
patent: 4873666 (1989-10-01), Lefebvre et al.
patent: 4879646 (1989-11-01), Iwasaki et al.
patent: 4910417 (1990-03-01), El Gamal et al.
patent: 4912630 (1990-03-01), Cochroft, Jr.
patent: 4924468 (1990-05-01), Horak et al.
patent: 4933897 (1990-06-01), Shankar et al.
patent: 4935719 (1990-06-01), McClure
patent: 4964033 (1990-10-01), Williams
patent: 4993027 (1991-02-01), McGraw et al.
patent: 5053700 (1991-10-01), Parrish
patent: 5059942 (1991-10-01), Burrows
patent: 5136590 (1992-08-01), Polstra et al.
patent: 5157673 (1992-10-01), Feldbrugge
patent: 5157781 (1992-10-01), Hardwod et al.
patent: 5173619 (1992-12-01), Gaudenzi et al.
patent: 5202976 (1993-04-01), Hansen et al.
patent: 5206948 (1993-04-01), DeAngelis et al.
patent: 5210862 (1993-05-01), DeAngelis et al.
patent: 5226149 (1993-07-01), Yoshida et al.
patent: 5226153 (1993-07-01), DeAngelis et al.
patent: 5317711 (1994-05-01), Bourekas et al.
patent: 5327435 (1994-07-01), Warchol
patent: 5345580 (1994-09-01), Tamaru et al.
patent: 5375228 (1994-12-01), Leary et al.
patent: 5400345 (1995-03-01), Ryan, Jr.
patent: 5418452 (1995-05-01), Pyle
patent: 5425036 (1995-06-01), Liu et al.
patent: 5442641 (1995-08-01), Beranger et al.
patent: 5450349 (1995-09-01), Brown, III et al.
patent: 5452437 (1995-09-01), Richey et al.
patent: 5473754 (1995-12-01), Folwell et al.
patent: 5475815 (1995-12-01), Byers et al.
patent: 5479652 (1995-12-01), Dreyer et al.
patent: 5488688 (1996-01-01), Gonzales et al.
patent: 5504755 (1996-04-01), Nozuyama
patent: 5519715 (1996-05-01), Hao et al.
patent: 5526365 (1996-06-01), Whetsel
patent: 5528526 (1996-06-01), Klug et al.
patent: 5530804 (1996-06-01), Edinggton et al.
patent: 5532174 (1996-07-01), Corrigan
patent: 5534798 (1996-07-01), Phillips et al.
patent: 5535331 (1996-07-01), Swoboda et al.
patent: 5541935 (1996-07-01), Waterson
patent: 5548775 (1996-08-01), Hershey
patent: 5550528 (1996-08-01), Offord et al.
patent: 5555428 (1996-09-01), Radigan et al.
patent: 5557619 (1996-09-01), Rapoport
patent: 5561761 (1996-10-01), Hicok et al.
patent: 5564041 (1996-10-01), Matsui et al.
patent: 5566300 (1996-10-01), Naoe
patent: 5579251 (1996-11-01), Sato
patent: 5579492 (1996-11-01), Gay
patent: 5586288 (1996-12-01), Dahlberg
patent: 5590354 (1996-12-01), Klapproth et al.
patent: 5598421 (1997-01-01), Tran et al.
patent: 5606564 (1997-02-01), Ho et al.
patent: 5606710 (1997-02-01), Hall et al.
patent: 5613144 (1997-03-01), Hall et al.
patent: 5623500 (1997-04-01), Whetsel, Jr.
patent: 5630048 (1997-05-01), La Joie et al.
patent: 5640508 (1997-06-01), Fujiwara et al.
patent: 5640542 (1997-06-01), Whitsel et al.
patent: 5644609 (1997-07-01), Bockhaus et al.
patent: 5699516 (1997-12-01), Sapir et al.
Montessoro et al. "General and Efficient Multiple List Traversal for Concurrent Fault Simulation", 1991 IEEE, pp. 43-48.
Marchioro et al, "Simulation of a Macro-pipelined Multi-CPU Event Processor for Use in Fastbus", 1989, IEEE, pp. 1597-1601.
Bockhaus John W.
Knebel Patrick
Lesartre Gregg B.
Perez Paul L.
Ranson Gregory L.
Hart Kevin M.
Hewlett--Packard Company
Sheikh Ayaz R.
Vo Tim T.
LandOfFree
Circuitry for providing external access to signals that are inte does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuitry for providing external access to signals that are inte, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuitry for providing external access to signals that are inte will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-874217