Patent
1995-06-07
1998-01-27
Gossage, Glenn
395490, 395653, 395828, G06F 1214, G06F 1200
Patent
active
057130060
ABSTRACT:
An electronic device and a method of operating the same to control access to configuration registers used by a memory controller, are disclosed. The disclosed device 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 device is also disclosed as in a computer system that further includes integrated circuit devices, such as a direct memory access (DMA) circuit. 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, as stored in the configuration registers.
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Burton Dana L.
Donaldson Richard L.
Gossage Glenn
Kesterson James C.
Texas Instruments Incorporated
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