Title:
BARREL SHIFTER
Document Type and Number:
WIPO Patent Application WO/1993/014456
Kind Code:
A1
Abstract:
A barrel shifter capable of shifting input data in both directions, left and right, without increasing its circuit scale. In a barrel shifter unit circuit of a plural-stage barrel shifter, provided are a tristate buffer (11X) for left-shifting and a tristate buffer (12X) for right-shifting. Either the tristate buffer (11X) or the tristate buffer (12X) is forced into operation by a left and right shifting signal (DS) applied to the input terminals for the left and right shifting signal. Therefore, by the left and right shifting signal (DS), a data transferring path is changed from an input terminal (IX) to an input/output line (10X) or (13X), and the setting of the left or the right shifting is possible. Also, when by address signals given to address terminals A0-A3, a shifting quantity is set, the input data can be shifted by the set shifting quantity and outputted.
Inventors:
NISHIMURA EIICHI (JP)
Application Number:
PCT/JP1993/000025
Publication Date:
July 22, 1993
Filing Date:
January 11, 1993
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD (JP)
International Classes:
G06F5/01; (IPC1-7): G06F7/00
Foreign References:
| JPS6132139A | 1986-02-14 | |||
| JPS60153543A | 1985-08-13 | |||
| JPH02130831A | 1990-05-18 |
Other References:
See also references of EP 0621533A4
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