Data format converting apparatus for use in a digital data proce

Details Data format converting apparatus for use in a digital data proce Data format converting apparatus for use in a digital data proce

1976-11-11

1979-02-20

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

364200, G06F 300

Patent

active

041410050

ABSTRACT:
Data format converting apparatus is described for simultaneously converting multiple bytes of zoned decimal data to packed decimal data or vice versa. In the preferred embodiment, this format converting apparatus is obtained by adding a minimum amount of additional circuitry to a multibyte flow-through type data shifter used for providing the normal data shifting operations in a digital data processor. In particular, a zoned-decimal-to-packed-decimal conversion capability is provided by combining additional switching logic with the normal shifter switching logic for enabling the conductors for nonadjacent data fields on the shifter input data bus to be coupled to the conductors for adjacent data fields on the shifter output data bus. A packed-decimal-to-zoned-decimal conversion capability is provided by adding further switching logic for enabling the conductors for adjacent data fields on the shifter input data bus to be coupled to the conductors for nonadjacent data fields on the shifter output data bus. Control circuitry is provided for selectively enabling either normal data shifting operations or zoned-to-packed format conversion operations or packed-to-zoned format conversion operations. The shifting and format converting hardware is organized so that implementation in the form of large-scale integration circuitry can be accomplished with a minimum number of integrated circuit chips and a minimum number of chip input/output connections per chip.

REFERENCES:
patent: 3292158 (1966-12-01), Schneberger
patent: 3387280 (1968-06-01), Bina
patent: 3493936 (1970-02-01), Gunderson
patent: 3599186 (1971-08-01), May
patent: 3772654 (1973-11-01), Evans

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