Method and apparatus for controlling of a memory subsystem installed with standard page mode memory and an extended data out memory

A memory controller, comprising:

• circuitry to detect a presence and type of a plurality of memory devices occupying memory banks in a computer system by performing operations including:
• writing a value to a memory location of a memory bank via a column control signal having a first timing characteristic corresponding to a first memory type;
• reading the memory location using a column control signal with a second different timing characteristic corresponding to a second memory type;
• and
• assigning a selected one of the first and second memory types to the memory bank based on a result of the reading using the column control signal with the second timing characteristic;
• and
• circuitry comprising a state machine, to generate respective control signals having different timing characteristics to access the first and second memory types.

A computer system comprising:

• a memory subsystem including a plurality of memory devices of different memory types;
• and
• a memory controller coupled to the memory subsystem including,
• circuitry to detect a presence and type of a plurality of memory devices occupying memory banks in a computer system by performing operations including:
• writing a value to a memory location of a memory bank via a column control signal having a first timing characteristic corresponding to a first memory type;
• reading the memory location using a column control signal with a second different timing characteristic corresponding to a second memory type;
• and
• assigning a selected one of the first and second memory types to the memory bank based on a result of the reading using the column control signal with the second timing characteristic;
• and
• circuitry comprising a column signal state machine to generate respective column control signals having different tinning characteristics to access the first and second memory types.