Three input arithmetic logic unit with barrel rotator and mask generator
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Nov 30, 1993
filing date -
Nov 30, 1993
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Abstract
A three input arithmetic logic unit (230) that generates a combination of the three inputs that is selected by a function signal. The second input signal comes from a controllable barrel rotator (235). The rotate amount is a default rotate amount stored in a special data register, a predetermined set of bits of data recalled from a data register or zero. A one's constant source (236) is connected to the barrel rotator (235) to supply a multibit digital signal of '1'. This permits generating a second input signal of the form 2.sup.N, with N being the rotate amount. The output of the barrel rotator (235) may be stored independently of the arithmetic logic unit (230) result. The third input signal comes from a multiplexer (233) that selects between an instruction specified immediate field, data recalled from a data register or a mask input from a mask generator (239). One preferred form of the mask has a number of right justified 1's corresponding to a mask input signal. This mask input signal may be the default barrel rotate amount or a predetermined number of the least significant bits of a third input signal as selected by a multiplexer. A second preferred form of the mask is selected one of the left most 1, the right most 1, the left most bit change or the right most bit change of a predetermined set of the least significant bits of data recalled from a data register.
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- 15 United States
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Patent Owner(s)
- TEXAS INSTRUMENTS INCORPORATED
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Balmer, Keith | Bedford, GB | 71 | 6203 |
Golston, Jeremiah E | Sugar Land, TX | 22 | 1132 |
Gove, Robert J | Plano, TX | 85 | 9787 |
Guttag, Karl M | Missouri City, TX | 138 | 7440 |
Ing-Simmons, Nicholas | Huntington, GB | 15 | 859 |
Moyse, Phillip | Bedford, GB | 5 | 315 |
Poland, Sydney W | Kary, TX | 26 | 1299 |
Read, Christopher J | Houston, TX | 46 | 2045 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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