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Electronic system with circuitry for selectively enabling access to configuration registers used by a memory controller

  • US 5,737,765 A
  • Filed: 06/07/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Term
First Claim
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1. An electronic system comprising:

  • a memory; and

    a microprocessor unit coupled to the memory and to a system bus, the microprocessor unit comprising;

    a memory controller circuit coupled to said memoryconfiguration registers for storing configuration information for use by said memory controller circuit in performing accesses to the memory; and

    a bus bridge circuit coupled to said system bus for transferring addresses and data, and comprising;

    a request logic circuit for generating, responsive to at least one of the addresses, a write request signal to said memory controller circuit signaling an impending write access to at least one of said configuration registers; and

    an enable circuit for enabling a write access to at least one of said configuration registers responsive to receiving a reply signal;

    wherein said memory controller circuit includes a reply logic circuit for generating the reply signal responsive to the combination of the write request signal from said request logic circuit and a signal in the memory controller indicating the absence of a pending memory operation utilizing current information in at least one of said configuration registers.

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