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US 4,301,514 AGranted
Data processor for processing at one time data including X bytes and Y bits
AssigneeHitachi, Ltd.
InventorsYoshiaki Eifuku, Kazunobu Mimura, Yasuyuki Okada
Life of this patent
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Abstract
A high performance data processor being able to perform an address arithmetic at a high speed without enlarging the scale of the data processor for the increased number of bits of address data is disclosed.
Claims6
A data processor comprising:
- a memory unit in which each word has the number of bits including X bytes+Y bits, and two words form one register;
- means for loading data to be loaded into the lower Y bits in the upper word also into the upper Y bits in the lower word when the result of the operand arithmetic is loaded into said register;
- an arithmetic unit capable of processing data in numbers of bits including X bytes+Y bits at a time;
- and
- means for reading out X bytes in the upper and lower words of said register separately when the data in said register is inputted into said arithmetic unit for executing the operand arithmetic.
2 more elements
A data processor comprising:
- a memory unit in which each word has the number of bits including X bytes+Y bits and two words form one register;
- means for loading data to be loaded into the lower Y bits in the upper word also into the upper Y bits in the lower word when the result of the operand arithmetic is loaded into a register and for loading the result of the address arithmetic into the entire lower word of a register;
- an arithmetic unit capable of processing data the number of bits including X bytes+Y bits at a time;
- and
- means for reading out X bytes in the upper and lower words of the register separately when the data in the register is inputted into said arithmetic unit for executing the operand arithmetic, and for reading out the entire lower word of said register at a time when the data in said register is inputted into said arithmetic unit for executing the address arithmetic.
2 more elements
Dependencies are inferred from the claim text.