Data processing unit of a microprogram control system for variab

Details Data processing unit of a microprogram control system for variab Data processing unit of a microprogram control system for variab

1982-09-22

1985-02-26

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 922

Patent

active

045021155

ABSTRACT:
The invention provides a data processing unit of a microprogram control system which transfers variable length data from one memory area to another memory area of a main memory. The data processing unit has a data length storage register for storing the length of the variable length data, an address boundary data register for storing address boundary data of a write address of the main memory for storing the variable length data, a ROM for reading out data indicating the type of memory write operation on the basis of the data length and address boundary data, another ROM for reading out data for calculating the next memory address in accordance with the type of memory write operation (full-word, half-word, and byte word), a register control section for outputting the variable length data during a write operation in accordance with the type of memory write operation in a predetermined byte position or positions, an operation control section for calculating a memory address for the next memory access on the basis of the previous memory access and storing the memory address to the memory address register, data buses for storing write data output at the predetermined byte position or positions in the memory data register, and a memory control section for writing data of the specified data length into the main memory.

REFERENCES:
patent: 3720920 (1973-03-01), Watson et al.

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