Electrical computers and digital processing systems: memory – Addressing combined with specific memory configuration or... – Addressing extended or expanded memory
Patent
1996-07-26
1998-11-03
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Addressing combined with specific memory configuration or...
Addressing extended or expanded memory
711 1, 711 2, 711202, 711203, 711154, 711270, G06F 1202, G06F 1206
Patent
active
058325336
ABSTRACT:
In a data processing unit having a plurality of general purpose registers, an instruction is loaded. Such an instruction includes an operation, and at least one operand field, where the operand field specifies one of a plurality of base registers and a displacement value. To calculate a general purpose register address specified by such an operand field, the displacement value is added to a base value stored in a base register that is specified by a portion of the operand field. Finally, the data processing unit addresses a selected one of the general purpose registers, utilizing the calculated general purpose register address, for execution of the specified operation. Thus, the data processing unit is capable of addressing a larger number of general purpose registers than may be directly addressed utilizing a value represented by a limited number of bits within the operand field.
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Agarwal Ramesh Chandra
Gustavson Fred G.
Johnson Mark A.
Olsson Brett
Chan Eddie P.
Dillon Andrew J.
England Anthony V. S.
International Business Machines - Corporation
Nguyen Than V.
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