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US4872128A
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High speed data processing unit using a shift operation
Assignee: Mitsubishi Electric Corp
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Filing: 1988-02-17
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Granted: 1989-10-03
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Expires: 2008-02-17
Abstract
Abstract A data processing unit includes a data register, a shift width register, an absolute value generator, a shift direction control circuit, and a shifter. The shifter is responsive to an absolute value of shift width data in the shift width register and a sign of the shift width data to decide the number of shift positions and the shift direction of data in the data register for performing a shift operation.
Inventors
- 👤 Toru Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:35
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/57; G06F5/00; G06F5/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A data processing unit comprising: a data register for storing data to be shifted; a shift width register for storing shift width data for specifying that said data to be shifted be moved by a predetermined shift width; an absolute value generator responsive to a sign of said shift width data to compute and store an absolute value of said shift width data; a shift direction control circuit responsive to said sign of said shift width data to control a shift direction; and a shifter for moving said data to be shifted by a shift width specified by the absolute value of said shift width data to a direction determined by said shift direction control circuit.
Claim 2
Dependent Claim
116 words
A data processing unit comprising: a data register for storing data to be shifted; a shift width register for storing shift width data for specifying that said data to be shifted be moved by a predetermined shift width; an absolute value generator responsive to a sign of said shift width data to compute and store an absolute value of said shift width data; a shift direction control circuit responsive to said sign of said shift width data to control a shift direction; and a shifter for moving said data to be shifted by a shift width specified by the absolute value of said shift width data to a direction determined by said shift direction control circuit.
Claim 3
Dependent Claim
26 words
The data processing unit of claim 1, wherein said shift width register is provided with a location for storing said sign of said shift width data.
Claim 4
Dependent Claim
53 words
The data processing unit of claim 1, wherein said absolute value generator comprises: a sign inverter for storing said shift width data; and a sign inverter control circuit responsive to said sign of said shift width data to invert said shift width data for generating an absolute value of said shift width data.
Claim 5
Dependent Claim
25 words
The data processing unit of claim 3, wherein said shift width register is provided with location for storing said sign of said shift width data.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |