Barrel shift device

Details Barrel shift device Barrel shift device

2005-08-31

2008-12-02

Mai, Tan V (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07461108

ABSTRACT:
When a barrel shift device is divided into pipeline registers and a shift process is executed in a multistage process stage, by decoding a second control signal for controlling a shift amount of a second shift circuit50using a decoding circuit20,it is detected at what digit positions in intermediate data in an intermediate data holding circuit30data elements which are to be finally output as output data from the second shift circuit50are located. Based on a result of the detection of digit positions by the decoding circuit20,the intermediate data holding circuit30holds only data elements to be finally output, among data elements in the intermediate data, and does not hold unnecessary data elements which are not included in the output data. Therefore, by controlling a data storage operation in the intermediate data holding circuit30,an increase in power due to the pipeline structure is suppressed.

REFERENCES:
patent: 5822231 (1998-10-01), Wong et al.
patent: 5844828 (1998-12-01), Fujimura et al.
patent: 2003/0131029 (2003-07-01), Bandy
patent: 2000-293354 (2000-10-01), None
patent: 2003-337694 (2003-11-01), None

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