Data processing system with condition data setting function

Details Data processing system with condition data setting function Data processing system with condition data setting function

1984-01-25

1986-08-26

Thomas, James D.

Boots, shoes, and leggings

G05F 750

Patent

active

046086609

ABSTRACT:
A data processing system with a condition data setting function is provided. In the system, a microprogram memory designed stores a plurality of specific subtraction micro-instructions for obtaining condition data consisting of a combination of bits respectively representing the sign of the results of each of a plurality of substraction operations. A micro-instruction read out from said microprogram memory is loaded into a micro-instruction register. An arithmetic and logic section performs an arithmetic operation, in accordance with the specific subtraction micro-instructions loaded in said micro-instruction register, and outputs status data including a carry flag and a sign flag. A multiplexer selects the carry flag or sign flag, in accordance with the first specific bit of the specific subtraction micro-instruction loaded in said micro-instruction register. The flag thus selected is input to a serial-to-parallel shift register, as one of the bits of said condition data, under control of the second specific bit of the specific subtraction micro-instruction. The condition data is a direction discrimination code used in a Bresenham DDA and is used as an index for determining which processing operation is to be performed next.

REFERENCES:
patent: 4041461 (1977-08-01), Kratz et al.
patent: 4202035 (1980-05-01), Lane
patent: 4272808 (1981-06-01), Hartwig
patent: 4323981 (1982-04-01), Nakamura

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