Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1996-12-19
1999-10-26
Cabeca, John W.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711170, G06F 1200
Patent
active
059745010
ABSTRACT:
A memory controller and method of operation for detecting different type of dynamic random access memory (DRAM) devices in a computer system. The memory controller has capabilities for improved page hits which cause the row address strobe signals to remain asserted following certain cycles. A mechanism in the memory controller selectably disables column address strobing. Different DRAM types are distinguishable by reading back data previously written to a memory location. Data is written to memory with a cycle causing the memory controller to keep the row address strobes asserted. Column address strobing is disabled. A read back cycle is performed without column address strobing. If data is present, the DRAM is an extended data output (EDO) DRAM. If data is not present, the DRAM is a fast page mode DRAM.
REFERENCES:
patent: 5630163 (1997-05-01), Fung et al.
patent: 5701438 (1997-12-01), Bains
patent: 5706407 (1998-01-01), Nakamura et al.
patent: 5708791 (1998-01-01), Davis
Micron's Technical Note: EDO Compatibility with FPM DRAMs (TN-04-40) May 1996.
Guntram Blohm, RAM quality tier--Is EDO RAM worth it?, www.dejanews.com Nov. 1995.
Dave Tatosian, Detecting EDO RAM with Triton Motherboards, www.dejanews.com Jul. 1995.
Intel 82430FX PCIset Datasheet 82437FX System Controller (TSC) and 82438FX Data Path Unit (TPD), p. 45 Dec. 1996.
Micron, New EDO DRAM, MT4C4007J(S), 1 Meg .times. 4 DRAM, 5V, EDO Page Mode, Optional Self Refresh, pp. 1-1 through 1-14 (1995).
Micron, FPM DRAM, MT4C1004J(S), 4 Meg .times. 1 DRAM, 5V, Standard or Self Refresh, pp. 2-1 through 2-14 (1995).
Micron, Technical Note, TN-04-21, Extended Data-Out, pp. 7-36 through 7-64 (1995).
Micron, New Technical Note, TN-04-29, Maximizing EDO Advantages, pp. 7-53 through 7-64 (1995).
Broyles Paul J.
Larson John E.
Shaver Charles N.
Zinsky Timothy R.
Cabeca John W.
Chow Christopher S.
Compaq Computer Corporation
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