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Memory controller and method for generating commands to a memory

  • US 6,226,724 B1
  • Filed: 09/03/1997
  • Issued: 05/01/2001
  • Est. Priority Date: 09/03/1997
  • Status: Expired due to Term
First Claim
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1. A memory controller for generating commands to a memory which uses encoded command signals not associated with conventional memory accesses, the memory controller comprising:

  • a control portion for controlling operation of the memory controller, the control portion providing only memory control signals normally associated with the conventional memory accesses, the encoded command signals being encoded by encoding combinations of the memory control signals normally associated with the conventional memory accesses to form the encoded command signals;

    an address comparator for receiving an address and for determining whether the address is assigned to the memory, the address comparator providing an output signal which both indicates a match between the address and one of a plurality of predetermined assigned addresses for the memory and which is also used as a first control signal for generation of one of the encoded command signals;

    a control register for storing and providing memory configuration information for the memory controller, the control register also storing a command bit which is used as a second control signal for generation of the one of the encoded command signals; and

    logic circuitry coupled to the control register, to the address comparator and to the control portion, the logic circuitry using the first and second control signals to provide a request signal to the control portion, the control portion providing one of the encoded command signals in response thereto.

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