JPS6419430A - Priority encoder - Google Patents

Priority encoder

Info

Publication number
JPS6419430A
JPS6419430A JP62174873A JP17487387A JPS6419430A JP S6419430 A JPS6419430 A JP S6419430A JP 62174873 A JP62174873 A JP 62174873A JP 17487387 A JP17487387 A JP 17487387A JP S6419430 A JPS6419430 A JP S6419430A
Authority
JP
Japan
Prior art keywords
ffo
instruction
ffz
circuit scale
find
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62174873A
Other languages
Japanese (ja)
Inventor
Shinichi Utsunomiya
Atsushi Sakurai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62174873A priority Critical patent/JPS6419430A/en
Publication of JPS6419430A publication Critical patent/JPS6419430A/en
Pending legal-status Critical Current

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  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE:To minimize a circuit scale and to quickly execute both of a FFO (find first one) instruction and a FFZ (first find zero) instruction by inputting bus data to a bit position detecting part after logical inversion and only providing a FFO part to selectively execute the FFO instruction and the FFZ instruction. CONSTITUTION:At the time of executing the FFZ instruction, inputted data bits have the logic inverted from that for execution of the FFO instruction to perform the FFO operation, and the FFO part is only provided to selectively execute functions of both of FFO and FFZ instructions in this manner. In the FFO part, all data bits are divided to, for example, four blocks by eight bits. Thus, the circuit scale is minimized and both of the FFO instruction and the FFZ instruction are quickly executed.
JP62174873A 1987-07-15 1987-07-15 Priority encoder Pending JPS6419430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62174873A JPS6419430A (en) 1987-07-15 1987-07-15 Priority encoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62174873A JPS6419430A (en) 1987-07-15 1987-07-15 Priority encoder

Publications (1)

Publication Number Publication Date
JPS6419430A true JPS6419430A (en) 1989-01-23

Family

ID=15986152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62174873A Pending JPS6419430A (en) 1987-07-15 1987-07-15 Priority encoder

Country Status (1)

Country Link
JP (1) JPS6419430A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05174582A (en) * 1991-09-02 1993-07-13 Mitsubishi Electric Corp Preference decision circuit for associated memory
US5736786A (en) * 1996-04-01 1998-04-07 Ford Global Technologies, Inc. Power module with silicon dice oriented for improved reliability
US8909905B2 (en) 2006-08-18 2014-12-09 Freescale Semiconductor, Inc. Method for performing plurality of bit operations and a device having plurality of bit operations capabilities

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59206942A (en) * 1983-05-11 1984-11-22 Nec Corp Leading "1" detecting circuit
JPS61267823A (en) * 1985-03-18 1986-11-27 テキサス　インスツルメンツ　インコ−ポレイテツド Detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59206942A (en) * 1983-05-11 1984-11-22 Nec Corp Leading "1" detecting circuit
JPS61267823A (en) * 1985-03-18 1986-11-27 テキサス　インスツルメンツ　インコ−ポレイテツド Detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05174582A (en) * 1991-09-02 1993-07-13 Mitsubishi Electric Corp Preference decision circuit for associated memory
US5736786A (en) * 1996-04-01 1998-04-07 Ford Global Technologies, Inc. Power module with silicon dice oriented for improved reliability
US8909905B2 (en) 2006-08-18 2014-12-09 Freescale Semiconductor, Inc. Method for performing plurality of bit operations and a device having plurality of bit operations capabilities

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