Electronic digital logic circuitry – Multifunctional or programmable – Having details of setting or programming of interconnections...
Patent
1995-08-18
1997-07-08
Hudspeth, David R.
Electronic digital logic circuitry
Multifunctional or programmable
Having details of setting or programming of interconnections...
326 40, H03K 19173
Patent
active
056465459
ABSTRACT:
A programmable logic device (PLD) comprises a plurality of configurable logic blocks (CLBs), an interconnect structure for interconnecting the CLBs, and a plurality of programmable logic elements for configuring the CLBs and the interconnect structure. Each CLB includes a combinational element and a sequential logic element, wherein at least one programmable logic element includes a plurality of memory cells for configuring the combinational element and at least one programmable logic element includes a plurality of memory cells for configuring the sequential logic element. A micro register, which stores a plurality of intermediate states of one CLB or interconnect structure, is located at the output of a CLB, the input of a CLB, or elsewhere in the interconnect structure. The PLD includes means for disabling access to at least one of said plurality of memory elements. In one embodiment, the memory cells are RAM cells, whereas in other embodiments the memory cells are ROM cells, or a combination thereof. The PLD switches between configurations sequentially, by random access, or on command from an external or internal signal. This reconfiguration allows the PLD to function in one of N configurations, wherein N is equal to the maximum number of memory cells assigned to each programmable point. In this manner, a PLD with a number M of actual CLBs functions as if it includes M times N effective CLBs.
REFERENCES:
patent: 4750155 (1988-06-01), Hsieh
patent: 4821233 (1989-04-01), Hsieh
patent: 5426378 (1995-06-01), Ong
patent: 5426738 (1995-06-01), Hsieh et al.
patent: 5469368 (1995-11-01), Agrawal et al.
"The Programmable Logic Data Book" copyright 1994, Xilinx, Inc., 2100 Logic Drive, San Jose, CA 95124.
"Principles of CMOS VLSI Design, A Systems Perspective", N. Weste & K. Eshraghian, Addison-Wesley Publishing Company, 1988, pp. 160-164.
Paper presented at IEEE Workshop on FPGA's for Custom Computing Machines, FCCM '93, Apr. 1993 entitled "Virtual Wires: Overcoming Pin Limitations in FPGA-based Logic Emulators", Jonathan Babb, et al. Jan. 26, 1993, pp. 1-15.
Narasimha B. Bhat, Kamal Chaudhary, and Ernest S. Kuh, "Performance-Oriented Fully Routable Dynamic Architecture for a Field Programmable Logic Device", Electronic Research Laboratory, College of Engineering, University of California, Berkeley, 1 Jun. 1993.
Andre DeHon, "DPGA-Coupled Microprocessors: Commodity ICs for the Early 21st Century", NE43-791, 545 Technology Square, Cambridge, MA 02139, 10 pages, Jan. 6, 1994.
Chi-Yuan Chin, et al., "A Dynamically Reconfigurable Interconnection Chip" Session XX: Special Purpose Accelerators; IEEE International Solid State Circuits Conference, pp. 276-277, 425, FEb. 27, 1987.
Laung-Terng Wang, et al. "SSIM: A Software Levelized Compiled-Code Simulator", 24th ACM/IEEE Design Automation Conference, 1987, Paper 2.1, pp. 2-8.
Randal E. Bryant, et al. "COSMOS: A Compiled Simulator for MOS Circuits", 24th ACM/IEEE Design Automation Conference, 1987,Paper 2.2, p. 9-16.
Peter M. Maurer, "Scheduling Blocks of Hierarchical Compiled Simulation of Combinational Circuits", IEEE Transactions on Computer-Aided Design, vol. 10, No. 2, Feb. 1991, pp. 184-192.
David M. Lewis, "Hierarchical Compiled Event-Driven Logic Simulation", Department of Electrical Engineering, University of Toronto, IEEE, 1989, pp. 498-501.
Carberry Richard A.
Johnson Robert Anders
Trimberger Stephen M.
Wong Jennifer
Harms Jeanette S.
Hudspeth David R.
Klivans Norman R.
Roseen Richard
Xilinx , Inc.
LandOfFree
Time multiplexed programmable logic device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Time multiplexed programmable logic device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time multiplexed programmable logic device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2410722