Electrical computers and digital processing systems: memory – Storage accessing and control – Memory configuring
Patent
1995-06-07
1998-04-07
Gossage, Glenn
Electrical computers and digital processing systems: memory
Storage accessing and control
Memory configuring
711163, 395651, 395653, 395830, 395833, 395310, G06F 1300
Patent
active
057377650
ABSTRACT:
An electronic system, such as a computer system, in which access to configuration registers used by a memory controller, is selectively enabled. The disclosed system includes a single integrated circuit microprocessor unit that includes a microprocessor core, a memory controller circuit, a bus bridge circuit, and configuration registers. The microprocessor unit is connected to external dynamic random access memory (DRAM). The memory controller circuit is operable to perform an operation utilizing current information in one or more of the configuration registers. The bus bridge circuit includes a request logic circuit for supplying a request output signaling an impending access to one or more of the configuration registers. The memory controller circuit includes a reply logic circuit for supplying a reply output back to the request logic circuit after the operation utilizing current configuration register information is completed. The request logic includes an enable circuit responsive to the reply output to then enable the impending access to the configuration registers. The electronic system may also include one or more additional integrated circuit devices, such as may include a direct memory access (DMA) circuit and a bus bridge interface circuit for bidirectional communication with the microprocessor unit. The microprocessor unit may also include a first level write-through cache in combination with a significantly smaller second level write-back cache. The disclosed microprocessor unit also includes circuitry for determining memory bank size and memory address type.
REFERENCES:
patent: 4739473 (1988-04-01), Ng et al.
patent: 5040153 (1991-08-01), Fung et al.
patent: 5274768 (1993-12-01), Traw et al.
patent: 5287531 (1994-02-01), Rogers, Jr. et al.
patent: 5301292 (1994-04-01), Hilton et al.
patent: 5307320 (1994-04-01), Farrer et al.
patent: 5317709 (1994-05-01), Sugimoto
patent: 5379384 (1995-01-01), Solomon
patent: 5386567 (1995-01-01), Lien et al.
patent: 5408129 (1995-04-01), Farmwald et al.
patent: 5446869 (1995-08-01), Padgett et al.
patent: 5513331 (1996-04-01), Pawlowski et al.
patent: 5548730 (1996-08-01), Young et al.
patent: 5574869 (1996-11-01), Young et al.
Linley Gwennap, Microprocessor Report, "TI Shows Integrated X86 CPU for Notebooks", vol. 8, No.2, Feb. 14, 1994, pp. 5-7.
ACC Micro, ACC 2056 3.3V Pentium Single Chip Solution for Notebook Applications, Rev. 1.1, pp. 1-1-1-10.
ACC Micro, ACC 2066 486/386DX Notebook Enhanced-SL Single Chip AT, Rev. 1.2, Oct. 11, 1993 pp. 1-1-1-10.
PicoPower, Redwood Technical Reference Manual, Databook 3.0P, Jul. 8, 1994, pp. i-iv, 18,19, 87-89.
ACC Micro, ACC Microelectronics Product Guide.
VIA Technologies, Inc., Energy Star-Compliant System Logic Solutions, Brochure.
OPTi, 82C895 Single Chip True Green PC Chipset.
OPTi, Blackhawk 486 Desktop Chipset.
EFAR, EC802G One Chip32 Bits PC/AT Core Logic, Technical Reference Manual, 1994, 11-14, 25,29.
ETEQ Micro, Buffalo ET 9000, 486 Write Back Cache "AT" Single Chip, Rev 03, May 1994, pp. 1-8.
ETEQ Micro, Panda 82C390SX, Single Chip 386 SX Direct Mapped Cache solution, Rev 0.1, Oct. 1991, pp. 1-4, Rev.02, Apr. 1992, pp. 5-10.
EFAR, SWIFT-IDE, 386 Chip UP grade 486, POWERset Pentium PCI/ISA Chip Set, 1994.
OPTi Python Chipset for Pentium Processors, 82C546 & 82C547 Data Book, Version 1.0, May 1994, pp. 1-3, 37,38,41,43,45-52,65,66,69,70,72.
Symphony Laboratories, Wagner 486 PC/AT Chip Set, Rev A.2,Features, Block Diagram, pp. 1-1-1-8.
UMC Super Energy Star Green File, Version 4.0, Preliminary UM8881F/8886F, Apr. 15, 1994, pp. 1, 7-18.
UMC Super Energy Star Green File, Version 4.0, Preliminary UM8498F/8496F/82C495F, Apr. 15, 1994, pp. 1-3, 17-19.
UMC Super Energy Star Green File, Version 4.0, Preliminary UM8486F, Apr. 15, 1994, pp. 6-8, 17-19.
OPTi, Viper Notebook Chipset, Preliminary Data Book, Ver.02, 82C556/82C557/82C558N, Jun. 1994, pp. 1-5, 46-67.
Texas Instruments, TACT84500 EISA Chip Set, Designer's Handbook, 1991, pp. 3-1-3-4, 3-42-3-44.
OPTi 82C802G, System/Power Management Controller, Mar. 1994, pp. 1-14, 19-22, 37.
OPTi 82C596/82C597, Cobra Chip for Pentium Processors Data Book, Rev. 1.0, Oct. 1994, pp. 1-3, 35-51.
Texas Instruments, TACT84411 Single-Chip 80486 Systems Logic, 1993, pp. 1-1-1-5, 2-1, 2-2, 4-1-4-15, 5-28.
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