1. An integrated circuit design device that designs a three-dimensional integrated circuit with use of a standard cell library, the standard cell library being composed of a plurality of libraries that are each appropriate for a different temperature, the integrated circuit design device comprising:
a temperature calculation unit operable to calculate, based on respective heat values and structure information pieces of respective chips forming layers constituting the three-dimensional integrated circuit to be designed, an operating temperature of a chip forming each of one or more target layers targeted for logic synthesis among the layers constituting the three-dimensional integrated circuit;
a standard cell library selection unit operable to, for each of the target layers, select one library among the libraries that is appropriate for an operating temperature that is closet to and higher than the operating temperature of the chip forming the target layer calculated by the temperature calculation unit; and
a logic synthesis unit operable to perform logic synthesis on each of the target layers with use of the library selected by the selection unit.
2. The integrated circuit design device of claim 1, further comprising a heat value calculation unit operable to calculate the respective heat values of the respective chips forming the layers constituting the three-dimensional integrated circuit.
3. The integrated circuit design device of claim 2, wherein
the heat value calculation unit calculates, for each of the respective chips forming the layers constituting the three-dimensional integrated circuit, a toggle rate by analyzing the chip based on an RTL (Register Transfer Level) description of the chip and an operation vector of the chip that is an operation pattern that results in a highest power consumption, and calculates a power consumption of the chip based on the calculated toggle rate to thereby calculate the respective heat values of the respective chips forming the layers constituting the three-dimensional integrated circuit.
4. The integrated circuit design device of claim 2, wherein
the heat value calculation unit calculates, for each of the respective chips forming the layers constituting the three-dimensional integrated circuit, a toggle rate by analyzing the chip based on an RTL (Register Transfer Level) description of the chip and constraint conditions for the logic synthesis, and calculates a power consumption of the chip based on the calculated toggle rate to thereby calculate the respective heat values of the respective chips forming the layers constituting the three-dimensional integrated circuit.
5. The integrated circuit design device of claim 2, wherein
the heat value calculation unit calculates the respective heat values of the respective chips forming the layers constituting the three-dimensional integrated circuit, by, for each of the respective chips, analyzing the chip based on an RTL (Register Transfer Level) description of the chip to calculate a circuit scale of each of modules constituting the chip, and referring to a predetermined heat value table with use of the RTL description, the calculated circuit scale of the module, a circuit type of the module, and a source voltage to be supplied to the module.
6. The integrated circuit design device of claim 1, wherein
with respect to one or more layers among the layers constituting the three-dimensional integrated circuit, the temperature calculation unit acquires, from a data sheet, respective heat values of respective chips forming the one or more layers.
7. The integrated circuit design device of claim 1, wherein
the structure information pieces each indicate a thicknesses of a corresponding one of the respective chips forming the layers constituting the three-dimensional integrated circuit.
8. The integrated circuit design device of claim 1, wherein
the structure information pieces each indicate a value of thermal conductivity of a corresponding one of the respective chips forming the layers constituting the three-dimensional integrated circuit.
9. The integrated circuit design device of claim 1, wherein
with respect to each of the target layers, in the case where two or more layers including the target layer among the layers constituting the three-dimensional integrated circuit are formed by respective chips having the same circuit structure, the standard cell library selection unit makes a comparison between the two or more layers in operating temperature to select a standard library appropriate for the highest operating temperature resulting from the comparison.
10. The integrated circuit design device of claim 1, wherein
the libraries each include a plurality of standard cells that differ in response duration from each other.
11. A method of designing a three-dimensional integrated circuit with use of a standard cell library, the standard cell library being composed of a plurality of libraries that are each appropriate for a different temperature, the method comprising:
using a computer to perform the steps of:
calculating, based on respective heat values and structure information pieces of respective chips forming layers constituting a three-dimensional integrated circuit to be designed, an operating temperature of a chip forming each of one or more target layers targeted for logic synthesis among the layers constituting the three-dimensional integrated circuit;
selecting, for each of the target layers, one library among the libraries that is appropriate for an operating temperature that is closet to and higher than the operating temperature of the chip forming the target layer calculated; and
performing logic synthesis on each of the target layers with use of the library selected.
12. A non-transitory computer-readable recording medium storing a program for causing a computer to perform a process of designing a three-dimensional integrated circuit with use of a standard cell library, the standard cell library being composed of a plurality of libraries that are each appropriate for a different temperature, the process comprising:
calculating, based on respective heat values and structure information pieces of respective chips forming layers constituting a three-dimensional integrated circuit to be designed, an operating temperature of a chip forming each of one or more target layers targeted for logic synthesis among the layers constituting the three-dimensional integrated circuit;
selecting, for each of the target layers, one library among the libraries that is appropriate for an operating temperature that is closet to and higher than the operating temperature of the chip forming the target layer calculated; and
performing logic synthesis on each of the target layers with use of the library selected.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system and method for enhancing at least one of a bookmark and a set of bookmarks related to a topic, comprising:
searching text associated with at least one of a bookmark and a set of bookmarks related to a topic so as to produce a list of key words;
assigning a value to each of said words from said list of key words according to the appearance of each word so as to produce a hierarchy key word list;
removing stop words from at least one of said key word list and said hierarchy key word list;
removing common stem word endings from at least one of said key word list and said hierarchy key word list;
removing low ranking members of said hierarchy key word list to form a search word list;
adding any stems removed from any word member of said search word list during formation of said hierarchy key word list;
searching a search engine utilizing said search word list so as to produce at least one of a list of universal resource locators (URLs) and names of websites associated with documents containing said search word list words;
organizing said at least one of a list of universal resource locators (URLs) and names of websites associated with documents containing said search word list word in a search result website hierarchy related to at least partially on the frequency of words from said hierarchy key word list;
bookmarking any documents according to said search result website hierarchy; and
adding said bookmarked search result website hierarchy to said original bookmark or set of bookmarks related to a topic.