Dynamically configurable interface cards with variable memory si

Details Dynamically configurable interface cards with variable memory si Dynamically configurable interface cards with variable memory si

1991-02-26

1995-09-05

Elmore, Reba I.

Boots, shoes, and leggings

364246, 364971, 364DIG1, G06F 1202

Patent

active

054487102

ABSTRACT:
Circuitry facilitates configuration of a memory within an interface card. The configuration includes configuring the memory size and the memory address space. A register stores configuration information from the computer system. Control lines are connected to the register and distribute information from the register to locations on the interface card. A comparator produces an output which indicates whether an address on address lines from the computer system is addressing memory locations within the memory. The comparator does this by comparing address bits on a first set of the address lines with control bits on a first set of the control lines. Logical circuitry, connected between a subset of the first set of the address lines and the comparator, is used to mask, from the comparator, address bits on the subset of the first set of address lines. Additional logical circuitry, connected to the second set of the control lines and connected between the subset of the first set of address lines and the memory is used for masking, from the memory, the address bits on the subset of the first set of address lines. When the address bits on the subset of the first set of address lines are masked from the comparator, the address bits on the subset of the first set of address lines are not masked from the memory. When the address bits on the subset of the first set of address lines are masked from the memory, the address bits on the subset of the first set of address lines are not masked from the comparator.

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IBM Technical Disclosure Bulletin, vol. 30, No. 3, Aug. 1987, "Programmable Address Comparator", pp. 1076-1078.
IBM Technical Disclosure Bulletin, vol. 33, No. 6B, Nov. 1990, "Programmable Main-Storage Card Map", pp. 455-458.

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