WO2022113282A1 - 半導体集積回路装置の設計方法、半導体集積回路装置及びプログラム - Google Patents
半導体集積回路装置の設計方法、半導体集積回路装置及びプログラム Download PDFInfo
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- WO2022113282A1 WO2022113282A1 PCT/JP2020/044262 JP2020044262W WO2022113282A1 WO 2022113282 A1 WO2022113282 A1 WO 2022113282A1 JP 2020044262 W JP2020044262 W JP 2020044262W WO 2022113282 A1 WO2022113282 A1 WO 2022113282A1
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- power switch
- switch circuit
- narrow
- arrangement pattern
- arrangement
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- 238000000034 method Methods 0.000 title claims abstract description 99
- 239000004065 semiconductor Substances 0.000 title claims abstract description 66
- 238000001514 detection method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 238000012804 iterative process Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 4
- 238000012938 design process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/392—Floor-planning or layout, e.g. partitioning or placement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/118—Masterslice integrated circuits
- H01L27/11803—Masterslice integrated circuits using field effect technology
- H01L27/11807—CMOS gate arrays
- H01L2027/11868—Macro-architecture
- H01L2027/11874—Layout specification, i.e. inner core region
- H01L2027/11881—Power supply lines
Definitions
- the present invention relates to a method for designing a semiconductor integrated circuit device, a semiconductor integrated circuit device, and a program.
- Power cutoff technology is one of the technologies for realizing low power consumption of semiconductor integrated circuit devices.
- Power cutoff technology is a technology that suppresses leakage current that causes power consumption by dividing the inside of a semiconductor integrated circuit device into multiple power supply domains (circuit blocks) and cutting off the power supply of the power supply domain that is not operating. Is.
- a power switch circuit for switching and controlling connection / disconnection between the global power supply wiring provided for the entire circuit arranged on the chip and the local power supply wiring provided for the circuit of the power supply domain is used.
- Patent Document 1 discloses a configuration in which a plurality of power switch circuits (PSWs) 902 are arranged in a stepped manner with respect to a power supply domain for power supply control in a semiconductor integrated circuit device 901.
- a plurality of power switch circuits 902 are arranged so as to be spaced from the row of adjacent power switch circuits 902 in the vertical direction at regular intervals in the horizontal direction.
- the power switch circuit 902 When a plurality of power switch circuits 902 are arranged in a regular arrangement pattern as shown in FIG. 9A, there are the following problems.
- the power switch circuit When a macro (functional circuit) that realizes a predetermined function is arranged in a semiconductor integrated circuit device, the power switch circuit may not be arranged in the same arrangement pattern depending on the arrangement of the macro.
- the power switch circuit 902A whose arrangement position does not overlap with the macro 903 can be arranged according to a predetermined arrangement pattern, but the arrangement position with the macro 903.
- the power switch circuit 902B that overlaps with each other cannot be arranged.
- the power switch circuit 902B If the power switch circuit 902B is not arranged, the power supply voltage fluctuation (IR-Drop) during operation in the circuit area becomes large and the constraint (criteria) cannot be satisfied, or the power supply to the circuit area cannot be performed. Sometimes. The occurrence of such a constraint violation (criteria violation) of the power supply voltage fluctuation (IR-Drop) causes a return work in the design process of the semiconductor integrated circuit device.
- FIG. 9B a method of arranging the power switch circuit 902 by shifting the arrangement position of the power switch circuit 902 that is not arranged when a predetermined arrangement pattern is followed.
- the power switch circuit 902 is arranged by sliding it so that the macro 903 and the arrangement position do not overlap with each other in the portion surrounded by the broken line.
- IR-Drop power supply voltage fluctuation
- the power supply switch circuit 902 and the power switch circuit 902 correspond to the narrow area between the macros 903.
- Global power supply wiring 911 and local power supply wiring 912 will be provided.
- the usable standard cell area is reduced, and the wiring resources that can be used for the signal wiring input / output to / from the standard cell and the macro, the signal wiring passing through, and the like are also reduced. Decreased available standard cell areas and wiring resources increase the likelihood of going back and forth in the design process of semiconductor integrated circuit equipment.
- An object of the present invention is to provide a method for designing a semiconductor integrated circuit device capable of appropriately arranging a power switch circuit.
- One aspect of the method for designing a semiconductor integrated circuit device is to arrange a plurality of macros in the circuit arrangement area of the semiconductor integrated circuit device in which a plurality of power switch circuits are arranged according to the first rule, and to arrange the macros in the circuit arrangement area.
- a narrow region having a width less than the first value is detected from the first region where is not arranged, and a power switch circuit is arranged in the detected narrow region according to a second rule different from the first rule. Then, the power switch circuit is arranged in the first region other than the narrow region according to the first rule.
- the disclosed semiconductor integrated circuit device design method allows the power switch circuit to be appropriately arranged.
- FIG. 1 is a diagram illustrating an outline of a method for designing a semiconductor integrated circuit device according to the present embodiment.
- FIG. 2 is a flowchart showing an example of a narrow region detection process in the present embodiment.
- FIG. 3A is a diagram illustrating division of the circuit arrangement area.
- FIG. 3B is a diagram illustrating an example of a determination criterion for a narrow region.
- FIG. 4A is a flowchart showing an example of the arrangement process of the power switch circuit in the first embodiment.
- FIG. 4B is a flowchart showing an example of the arrangement process of the power switch circuit in the first embodiment.
- FIG. 5A is a flowchart showing an example of the arrangement process of the power switch circuit in the second embodiment.
- FIG. 5B is a flowchart showing an example of the arrangement process of the power switch circuit in the second embodiment.
- FIG. 6A is a diagram showing an example of an arrangement pattern in the present embodiment.
- FIG. 6B is a diagram showing an example of an arrangement pattern in the present embodiment.
- FIG. 6C is a diagram showing an example of an arrangement pattern in this embodiment.
- FIG. 7 is a diagram illustrating an example of a semiconductor integrated circuit device according to the present embodiment.
- FIG. 8 is a diagram showing a configuration example of a computer that can realize the design method of the semiconductor integrated circuit device in the present embodiment.
- FIG. 9A is a diagram illustrating an arrangement example of a power switch circuit in a semiconductor integrated circuit device.
- FIG. 9B is a diagram illustrating another arrangement example of the power switch circuit in the semiconductor integrated circuit device.
- the semiconductor integrated circuit device to be designed in the embodiment described below is a semiconductor integrated circuit device having a power supply domain in which control related to power supply is performed.
- a power switch circuit for controlling the connection state between the global power supply wiring provided for the entire circuit arranged on the chip and the local power supply wiring provided for the circuit of the power supply domain is provided to provide a global power supply. Whether or not the wiring and the local power supply wiring are electrically connected can be switched by a control signal.
- the power supplied by the global power supply wiring is supplied to the circuit of the power supply domain via the local power supply wiring connected by the power switch circuit.
- the global power supply wiring, local power supply wiring, and power supply switch circuit may be provided on the power supply potential side or the ground potential side.
- a global power supply wiring that supplies the power supply potential and a local power supply wiring that supplies the power supply potential are provided, and a power supply switch circuit is provided between the global power supply wiring that supplies the power supply potential and the local power supply wiring that supplies the power supply potential. The case will be described as an example.
- FIG. 1 is a diagram illustrating an outline of a method for designing a semiconductor integrated circuit device according to the present embodiment.
- the method for designing a semiconductor integrated circuit device in the present embodiment can be realized by, for example, a computer (design device), and each process of the method for designing the semiconductor integrated circuit device in the present embodiment is executed by the processor (CPU or the like).
- step S101 the processor arranges a macro (functional circuit) in the circuit arrangement area of the semiconductor integrated circuit device based on the logic circuit information read from the external storage device or the like and the design data including the netlist.
- the macro is a designed circuit block that realizes a predetermined function, and is, for example, a memory macro or the like.
- the processor detects a narrow area (Narrow Area) in the circuit arrangement area after the macro is arranged.
- the narrow area (Narrow Area) is, for example, the distance between macros or the macro and circuit arrangement in the area (standard cell arrangement area) in which macros are not arranged in the circuit arrangement area.
- the area where the distance from the outer edge of the area is smaller than a predetermined value.
- step S103 and step S104 the processor arranges the power switch circuit (PSW) in the area (standard cell arrangement area) in which the macro is not arranged in the circuit arrangement area, and wirings related to the power supply. Perform (power supply wiring).
- step S103 the processor arranges the power switch circuit in accordance with the first rule for the area other than the narrow area detected in step S102, and performs power supply wiring.
- the arrangement pattern according to the first rule is, for example, an arrangement pattern for arranging in a staircase pattern as shown in FIG. 9A.
- step S104 the processor arranges the power switch circuit in accordance with the second rule different from the first rule for the narrow area detected in step S102, and performs power supply wiring.
- steps S103 and S104 are in no particular order, and after the power switch circuit is arranged and the power supply wiring is performed in the narrow area, the power switch circuit is arranged and the power supply wiring is performed in the area other than the narrow area. May be good.
- step S105 the processor arranges a circuit cell (standard cell or the like) in the standard cell arrangement area in the circuit arrangement area based on the design data, and performs wiring such as signal wiring.
- a circuit cell standard cell or the like
- step S106 the processor arranges macros and circuit cells in the circuit arrangement area based on the design data, and performs power supply wiring and signal wiring. Drop) is analyzed.
- the analysis process of the power supply voltage fluctuation (IR-Drop) during operation in the semiconductor integrated circuit device may be performed by using a well-known technique.
- step S107 the processor arranges the power switch circuit, corrects the power supply wiring, and the like according to the analysis result of the power supply voltage fluctuation (IR-Drop) performed in step S106. For example, when a constraint violation (criteria violation) occurs in the analysis of the power supply voltage fluctuation (IR-Drop) in step S106, the processor arranges the power switch circuit and power supply wiring so as to eliminate the constraint violation (criteria violation). Make corrections.
- IR-Drop analysis result of the power supply voltage fluctuation
- FIG. 2 is a flowchart showing an example of the detection process of the narrow area (Narrow Area) in step S102 shown in FIG.
- step S201 the processor horizontally divides the area (standard cell arrangement area) in which the macro is not arranged in the circuit arrangement area.
- the lateral direction is assumed to indicate a direction perpendicular to the direction in which the power supply wiring extends.
- the processor sets the standard cell arrangement area in the circuit arrangement area 301 as the right side or the left side of the macro 302, or the right side or the left side of the outer edge portion of the circuit arrangement area 301 as the opposite side of the rectangle. Divide into division areas. In the example shown in FIG. 3A, the processor is divided into eight division areas Z1 to Z8.
- step S202 the processor determines whether or not there is a user-instructed value specified in advance by the user as a threshold value used for detecting a narrow area. If the processor determines that there is a user-instructed value (NO in step S202), the processor proceeds to step S203, and if it determines that there is no user-instructed value (YES in step S202), the processor proceeds to step S204.
- step S203 the processor sets the width x of the narrow area determination standard used for determining whether or not the area is a narrow area to a user-instructed value specified in advance by the user, and proceeds to step S205.
- step S204 the processor sets the width x of the determination criterion in the narrow area to a specified value, and proceeds to step S205.
- This specified value is a value specified in consideration of the pitch (arrangement interval) of the power switch circuit when arranging the power switch circuit according to the first rule.
- the specified value is a width 313 which is the sum of the width of one power switch circuit 312 and the length twice the pitch of the power switch circuit 312, as shown in FIG. 3B as an example.
- the pitch is the distance between the corresponding parts of the adjacent power switch circuits, for example, the lateral distance between the left sides of the adjacent power switch circuits.
- 311 is a macro (functional circuit).
- step S205 the processor selects one unprocessed divided area from the divided areas divided in step S201.
- step S206 the processor determines whether or not the width of the target divided area is less than the width x of the determination criterion of the narrow area. If the processor determines that the width of the target divided area is less than the width x of the criterion (YES in step S206), the processor proceeds to step S207, and the width of the target divided area is not less than the width x of the criterion. If it is determined (NO in step S206), the process proceeds to step S208.
- step S207 the processor adds the target divided area to the narrow area by registering the target divided area in the narrow area list, and proceeds to step S208.
- step S208 the processor returns to step S205 if there is an unprocessed divided area in the divided area divided in step S201, and there is no unprocessed divided area, that is, processing is completed for all the divided areas. If so, the detection process for the narrow area is terminated.
- the standard cell arrangement area in the circuit arrangement area is divided in the horizontal direction, but it may be divided in the vertical direction (the same direction as the direction in which the power supply wiring extends). ..
- the processor divides the standard cell arrangement area in the circuit arrangement area 301 into a division area in which the upper side or the lower side of the macro 302 or the upper side or the lower side of the outer edge portion of the circuit arrangement area 301 is the opposite side of the rectangle. Then, the same processing as the above-mentioned processing is performed.
- FIGS. 4A and 4B are flowcharts showing an example of the arrangement process of the power switch circuit in the first embodiment.
- step S401 the processor detects a narrow area (Narrow Area) in the circuit arrangement area of the semiconductor integrated circuit device in which the macro (functional circuit) is arranged, for example, as shown in FIG.
- step S402 the processor refers to the narrow area list, and supplies power to the area other than the narrow area in the area where the macro is not arranged (standard cell arrangement area) in the circuit arrangement area according to the first rule. Place the switch circuit.
- the arrangement pattern of the power switch circuit according to the first rule is, for example, an arrangement pattern in which the power switch circuit is arranged in a staircase pattern as shown in FIG. 9A.
- the processor arranges the power switch circuit for each of the narrow areas in the area where the macro is not arranged (standard cell arrangement area) in the circuit arrangement area.
- the processor refers to the narrow area list and selects one of the narrow areas in which the power switch circuit is not arranged.
- step S404 the processor arranges the power switch circuit in the initial arrangement pattern for the target narrow area.
- the initial arrangement pattern of the power switch circuit is an arrangement pattern according to a rule different from the arrangement pattern of the power switch circuit according to the first rule.
- step S405 the processor returns to step S403 if there is a narrow area in the narrow area list in which the power switch circuit is not arranged.
- the processor proceeds to step S406 when there is no narrow area in which the power switch circuit is not arranged, that is, when the power switch circuit is arranged in the initial arrangement pattern in all the narrow areas of the narrow area list.
- the order in which the power switch circuit is arranged in the area other than the narrow area and the power switch circuit is arranged in the narrow area in steps S402 to S405 is arbitrary, and the power switch circuit is arranged in the narrow area. Later, the power switch circuit may be arranged in an area other than the narrow area.
- step S406 the processor performs power supply wiring related to the power supply switch circuit and the like arranged as described above.
- the processor connects to a power switch circuit to perform wiring such as global power supply wiring and local power supply wiring for supplying power supply potential, and power supply wiring for supplying ground potential.
- step S407 the processor roughly arranges and wirings circuit cells (standard cells and the like), signal wiring, and the like with respect to the standard cell arrangement area in the circuit arrangement area.
- step S408 the processor performs wiring congestion detection processing for evaluating the wiring margin in the standard cell arrangement area in the circuit arrangement area where the arrangement and wiring are performed as described above.
- the wiring congestion detection process it is assumed that the wiring is congested when there is more wiring than the amount corresponding to the size of the area in the area to be detected.
- the amount of wiring according to the size of the area shall be predetermined.
- the wiring congestion detection process may be performed using a well-known technique. After performing the wiring congestion detection process, the processor proceeds to step S409 shown in FIG. 4B.
- step S409 the processor determines whether or not there is wiring congestion in the narrow area in the circuit arrangement area.
- the processor determines that there is no wiring congestion in all the narrow areas in the circuit arrangement area (NO in step S409), the processor proceeds to step S411, and if there is wiring congestion in at least one narrow area in the circuit arrangement area. If it is determined (YES in step S409), the process proceeds to step S431.
- the processor repeats steps S411 to S414 to make the arrangement pattern more resistant to IR-Drop (power supply voltage fluctuation) than the current arrangement pattern for each of the narrow areas. Change to and place the power switch circuit. That is, the processor determines whether or not there is an arrangement pattern that is stronger in IR-Drop than the current arrangement pattern (S412). When the processor determines that there is a stronger arrangement pattern in IR-Drop (YES in step S412), the arrangement pattern is stronger in IR-Drop (more suppresses and reduces the fluctuation of the power supply voltage) and is narrow.
- a power switch circuit is arranged in the area (S413).
- an arrangement pattern that is more resistant to IR-Drop is, for example, an arrangement pattern in which the number of power switch circuits arranged in the region is increased.
- FIG. 6A shows the original arrangement pattern
- FIG. 6B shows an example of an arrangement pattern that is more resistant to IR-Drop than FIG. 6A.
- 611 and 621 are power switch circuits
- 612 and 622 are local power supply wirings
- 613 and 623 are global power supply wirings.
- 631 and 632 are macros (for example, memory macros).
- the power switch circuit 611 is arranged stepwise according to the first rule in the area 601 which is not a narrow area. Further, in the narrow region 602, the power switch circuits 621 are arranged in a row (624A) along one of the macros 631 according to a rule different from the first rule.
- the local power supply wiring 612 and the global power supply wiring 613 are connected to the power switch circuit 611, and the local power supply wiring 622 and the global power supply wiring 623 are connected to the power supply switch circuit 621.
- the local power supply wiring 612 connected to the power supply switch circuit 611 arranged in the region 601 is wired as long as it can be wired, and the global power supply wiring 613 connected to the power supply switch circuit 611 is wired only in the region 601. Will be done. Therefore, in the arrangement pattern shown in FIG. 6A, the local power supply wiring 612A connected to the power supply switch circuit 611 is wired not only in the area 601 but also in the narrow area 602.
- the global power supply wiring 613A connected to the power supply switch circuit 611 can be wired even in the narrow region 602, but is wired only in the region 601. In this way, wiring resources are secured by not wiring the global power supply wiring 613 connected to the power supply switch circuit 611 to the narrow area 602.
- the power switch circuit 611 in the area 601 that is not a narrow area, is arranged in a staircase pattern according to the first rule, similarly to the arrangement pattern shown in FIG. 6A. Further, in the narrow region 602, the power switch circuits 621 are arranged in two rows (624A, 624B) along the macros 631 and 632, respectively, according to a rule different from the first rule. Similar to the arrangement pattern shown in FIG. 6A, the power switch circuit 611 is connected to the local power supply wiring 612 and the global power supply wiring 613, and the power supply switch circuit 621 is connected to the local power supply wiring 622 and the global power supply wiring 623. ing.
- the local power supply wiring 612 connected to the power supply switch circuit 611 arranged in the area 601 is wired as long as it can be wired, and the power supply switch circuit 611 is used.
- the global power supply wiring 613 connected to is wired only in the area 601. Therefore, in the arrangement pattern shown in FIG. 6B, the local power supply wiring 612A connected to the power supply switch circuit 611 is wired not only in the area 601 but also in the narrow area 602.
- the global power supply wiring 613A connected to the power supply switch circuit 611 can be wired even in the narrow region 602, but is wired only in the region 601.
- IR-Drop power supply voltage fluctuation
- the processor After returning to the process shown in FIG. 4B and changing the arrangement pattern in the narrow region by the iterative process of steps S411 to S414, the processor performs power supply wiring (S415) in the same manner as in steps S406 to S408 described above, and the circuit cell. (Standard cell, etc.), signal wiring, etc. are roughly arranged and wired (S416), and wiring congestion detection processing is performed (S417).
- step S4108 the processor determines whether or not there is wiring congestion in the narrow area.
- the processor determines that there is no wiring congestion in all the narrow areas (NO in step S418)
- the processor returns to step S411 and performs a process of changing the arrangement pattern in the narrow area to an arrangement pattern that is more resistant to IR-Drop. ..
- step S418 When it is determined in step S418 that there is wiring congestion in at least one narrow area (YES), the processor proceeds to step S419, and the arrangement pattern in the narrow area is determined and fixed by the iterative processing of steps S419 to S422.
- the processor changes the wiring pattern to an arrangement pattern immediately before the arrangement pattern in which wiring congestion occurred in step S418, that is, an arrangement pattern in which wiring resources are larger than the arrangement pattern in which wiring congestion occurs (S420).
- the arrangement pattern of the target narrow area is fixed (S421). Then, the arrangement process of the power switch circuit is completed.
- the processor changes the arrangement pattern in which the wiring resource is larger than the current arrangement pattern for each of the narrow areas by the iterative process of steps S431 to S434. And arrange the power switch circuit. That is, the processor determines whether or not there is an arrangement pattern in which the wiring resource is larger than the current arrangement pattern (S432). When the processor determines that there is an arrangement pattern with a larger wiring resource (YES in step S432), the processor arranges the power switch circuit in a narrow area in the arrangement pattern with a larger wiring resource (S433). On the other hand, when the processor determines that there is no arrangement pattern having a larger wiring resource (NO in step S432), the processor ends the iterative process of steps S431 to S434.
- FIG. 6A shows the original arrangement pattern
- FIG. 6C shows an example of the arrangement pattern in which the wiring resource is larger than that of FIG. 6A. Since FIG. 6A has already been described, the description thereof will be omitted here.
- 611 and 621 are power switch circuits
- 612 and 622 are local power supply wirings
- 613 and 623 are global power supply wirings.
- 631 and 632 are macros (for example, memory macros).
- the power switch circuit 611 is arranged in a staircase pattern according to the first rule, similarly to the arrangement pattern shown in FIG. 6A. Further, in the narrow region 602, the power switch circuits 621 are arranged in a row (624A) along one macro 631 according to a rule different from the first rule, similar to the arrangement pattern shown in FIG. 6A. There is.
- the local power supply wiring 612 and the global power supply wiring 613 are connected to the power switch circuit 611, and the local power supply wiring 622 and the global power supply wiring 623 are connected to the power supply switch circuit 621.
- the local power supply wiring 612 and the global power supply wiring 613 connected to the power supply switch circuit 611 arranged in the area 601 are wired only in the area 601. Therefore, in the arrangement pattern shown in FIG. 6C, the local power supply wiring 612B and the global power supply wiring 613A connected to the power supply switch circuit 611 can be wired even in the narrow region 602, but only the region 601 is wired. In this way, by not wiring the local power supply wiring 612 and the global power supply wiring 613 connected to the power supply switch circuit 611 in the narrow area 602, a wiring resource larger than the arrangement pattern shown in FIG. 6A is secured.
- the processor After returning to the process shown in FIG. 4B and changing the arrangement pattern in the narrow region by the iterative process of steps S431 to S434, the processor performs power supply wiring (S435) in the same manner as in steps S406 to S408 described above, and the circuit cell. (Standard cell, etc.), signal wiring, etc. are roughly arranged and wired (S436), and wiring congestion detection processing is performed (S437).
- step S438 the processor determines whether or not there is wiring congestion in the narrow area.
- the processor determines that there is wiring congestion in at least one narrow area (YES in step S438)
- the processor returns to step S431 and performs a process of changing the arrangement pattern in the narrow area to an arrangement pattern having a larger wiring resource. ..
- step S438 When it is determined in step S438 that there is no wiring congestion in all the narrow areas (NO), the processor proceeds to step S439, and the arrangement pattern in the narrow areas is determined and fixed by the iterative processing of steps S439 to S441.
- the processor fixes the arrangement pattern when it is determined that there is no wiring congestion in all the narrow areas as the arrangement pattern of the target narrow area (S440). Then, the arrangement process of the power switch circuit is completed.
- a narrow area list is created by the narrow area detection process, all the narrow areas are listed, and then the initial arrangement of the power switch circuit and the process of changing the arrangement pattern are executed.
- the process of arranging the power switch circuit and changing the pattern may be sequentially executed at the stage where each narrow area is detected without listing the narrow areas.
- the processor when there is no wiring congestion in the initial arrangement pattern for a narrow area, the processor is more resistant to IR-Drop (more power supply voltage fluctuation) within a range where wiring congestion does not occur.
- the processor updates to an arrangement pattern that is more resistant to IR-Drop until wiring congestion occurs in a narrow area, and when wiring congestion occurs, the processor changes to an arrangement pattern with a large wiring resource before that and changes to a narrow area. Fix the placement pattern of. If there is no candidate placement pattern to be updated, fix it with the current placement pattern.
- the processor searches for an arrangement pattern with larger wiring resources.
- the processor updates to an arrangement pattern in which wiring resources are larger in a narrow area, and fixes an arrangement pattern in which the degree of wiring congestion is reduced as an arrangement pattern in a narrow area. If there is no candidate placement pattern to be updated, fix it with the current placement pattern.
- the power switch circuit in consideration of the restrictions (criteria) of the power supply voltage fluctuation (IR-Drop) and the wiring resources.
- IR-Drop the power supply voltage fluctuation
- the wiring resource By arranging in consideration of the constraint (criteria) of the power supply voltage fluctuation (IR-Drop) and the wiring resource, it is possible to suppress the occurrence of the return work in the design process of the semiconductor integrated circuit device.
- the power switch circuit is arranged in the same arrangement pattern for all the narrow areas in the circuit arrangement area of the semiconductor integrated circuit apparatus.
- the arrangement pattern of the power switch circuit is individually determined for each narrow area, and the power switch circuit is arranged for each narrow area with an arrangement pattern that does not depend on other narrow areas.
- the power switch circuit can be arranged in an appropriate arrangement pattern for each narrow area in the circuit arrangement area.
- 5A and 5B are flowcharts showing an example of the arrangement process of the power switch circuit in the second embodiment.
- step S501 the processor detects a narrow area (Narrow Area) in the circuit arrangement area of the semiconductor integrated circuit device in which the macro (functional circuit) is arranged, for example, as shown in FIG.
- step S502 the processor refers to the narrow area list and supplies power to the area other than the narrow area in the area where the macro is not arranged (standard cell arrangement area) in the circuit arrangement area according to the first rule. Place the switch circuit.
- the arrangement pattern of the power switch circuit according to the first rule is, for example, an arrangement pattern in which the power switch circuit is arranged in a staircase pattern as shown in FIG. 9A.
- the processor arranges the power switch circuit in the initial arrangement pattern for each of the narrow areas in the area where the macro is not arranged (standard cell arrangement area) in the circuit arrangement area.
- the initial arrangement pattern is an arrangement pattern according to a rule different from the arrangement pattern of the power switch circuit in the first rule.
- the processor After arranging the power switch circuit for the area other than the narrow area and the narrow area, the processor performs the power wiring related to the power switch circuit and the like (S506), and the circuit cell is relative to the standard cell arrangement area in the circuit arrangement area. (Standard cell, etc.), signal wiring, etc. are roughly arranged and wired (S507), wiring congestion is detected, and IR-Drop (power supply voltage fluctuation) is estimated (S508).
- the wiring congestion detection process and the power supply voltage fluctuation (IR-Drop) estimation process may be performed using well-known techniques.
- the processor executes the processes of steps S509 to S519 for each narrow area in which the arrangement pattern is not fixed.
- step S509 the processor selects one narrow area to be processed from the narrow areas whose arrangement pattern is not fixed.
- step S510 the processor is in a state where there is wiring congestion in the narrow area to be processed and there is IR-Drop (power supply voltage fluctuation) which is a constraint violation (criteria violation) in the narrow area and surrounding macros. It is determined whether or not it is. If the processor determines that there is wiring congestion in the narrow area to be processed and there is an IR-Drop that violates the constraint in the narrow area or the surrounding macro (YES in step S510), the processor proceeds to step S511. If not (NO in step S510), the process proceeds to step S512.
- IR-Drop power supply voltage fluctuation
- step S511 since the processor has wiring congestion and IR-Drop that violates the constraint, it is insufficient to deal with the change in the arrangement pattern related to the power switch circuit. Therefore, the macro for the narrow area to be processed. Give instructions to correct the placement. After that, the processor proceeds to step S519.
- step S512 the processor determines whether or not there is wiring congestion in the narrow area to be processed.
- the processor determines that there is wiring congestion in the narrow area to be processed (YES in step S512)
- the processor proceeds to step S513, and when it determines that there is no wiring congestion in the narrow area to be processed (NO in step S512).
- step S513 the processor determines whether or not there is an arrangement pattern in which the wiring resource is larger than the current arrangement pattern. That is, the processor determines whether or not there is an arrangement pattern with larger wiring resources.
- the processor determines that there is an arrangement pattern having a larger wiring resource (YES in step S513)
- the processor proceeds to step S514.
- the processor determines that there is no arrangement pattern having a larger wiring resource (NO in step S513)
- the processor proceeds to step S518 because there is no arrangement pattern as a change candidate.
- step S514 the processor changes the arrangement pattern in the narrow area to be processed to the arrangement pattern with a large wiring resource, and proceeds to step S519.
- An example of the process of changing the arrangement pattern to the arrangement pattern having a large wiring resource is as described with reference to FIGS. 6A and 6C in the first embodiment.
- step S515 the processor determines whether or not there is an IR-Drop that violates the constraint in the narrow area to be processed or the macro around it. If the processor determines that there is an IR-Drop that violates the constraint (YES in step S515), the processor proceeds to step S516, and if it determines that there is no IR-Drop that violates the constraint (NO in step S515), the processor proceeds to step S516. The process proceeds to step S518.
- step S516 the processor determines whether or not there is an arrangement pattern that is stronger in IR-Drop than the current arrangement pattern. That is, the processor determines whether or not there is a stronger arrangement pattern in IR-Drop. If the processor determines that the IR-Drop has a stronger arrangement pattern (YES in step S516), the processor proceeds to step S517. On the other hand, when the processor determines that the IR-Drop does not have a stronger arrangement pattern (NO in step S516), the processor proceeds to step S518 because there is no arrangement pattern as a change candidate.
- step S517 the processor changes the arrangement pattern in the narrow area to be processed to an arrangement pattern that is strong against IR-Drop, and proceeds to step S519.
- An example of the process of changing the arrangement pattern to the arrangement pattern strong against IR-Drop is as described with reference to FIGS. 6A and 6B in the first embodiment.
- step S5128 since the processor does not have an arrangement pattern that is a candidate for change for the narrow area of the processing target, the arrangement pattern of the narrow area of the processing target is fixed to the current arrangement pattern. After that, the processor proceeds to step S519.
- step S519 the processor returns to step S509 if there is an unprocessed narrow area in the narrow area where the arrangement pattern is unfixed, and proceeds to step S520 if there is no unprocessed narrow area.
- step S520 the processor determines whether or not there is a correction instruction for macro arrangement.
- the processor determines that there is a macro placement correction instruction (YES in step S520)
- the processor ends the process and returns to the macro placement process, and when it determines that there is no macro placement correction instruction (NO in step S520). ) To step S521.
- step S521 the processor determines whether or not the arrangement pattern has been changed in any of the narrow areas.
- the processor determines that the arrangement pattern has been changed in any of the narrow areas (YES in step S521)
- the processor returns to step S506 and re-executes the processes after step S506.
- the processor determines that the arrangement pattern has not been changed in any of the narrow areas (NO in step S521)
- the processor determines that the arrangement pattern has been fixed in all the narrow areas and ends the process. ..
- the processor when any one of IR-Drop (power supply voltage fluctuation) that causes wiring congestion or constraint violation (criteria violation) is confirmed in a narrow area, the processor adopts an arrangement pattern to improve it. Make changes. If wiring congestion occurs in a narrow area, change to an arrangement pattern with a large wiring resource, and if there is an IR-Drop that violates the constraint, change to an arrangement pattern that is strong against IR-Drop. If there is no change candidate placement pattern, the current placement pattern is used. Further, when both wiring congestion and IR-Drop that violates the constraint are confirmed in a narrow area, the processor issues an instruction to correct the macro arrangement because it is not enough to change the arrangement pattern. The processor performs this processing for each narrow area in the circuit arrangement area.
- IR-Drop power supply voltage fluctuation
- FIG. 7 is a diagram illustrating an example of a semiconductor integrated circuit device having a layout corresponding to the above-mentioned design method of the semiconductor integrated circuit device.
- the macro 702 is arranged in the circuit arrangement area 701 of the semiconductor integrated circuit device, and the power switch circuit (PSW) 703 is arranged in the area (standard cell arrangement area) in which the macro 702 is not arranged in the circuit arrangement area 701. ..
- the power switch circuit 703 follows the first rule (as an example, a stepped region). It is arranged (in the arrangement pattern).
- the power switch circuit 703 follows a rule different from the first rule (as an example, in a row). It is arranged (in the arrangement pattern of).
- the arrangement pattern shown in FIG. 6A is taken as an example of the original arrangement pattern, and according to FIGS. 6B and 6C, an example of an arrangement pattern that is more resistant to IR-Drop and an example of an arrangement pattern that has a larger wiring resource. Are shown one by one, but the present invention is not limited to these. If more multiple arrangement patterns with different strengths and wiring resource amounts for IR-Drop are prepared, and the arrangement patterns are ordered and applied in consideration of IR-Drop and wiring properties. good.
- a program product in which each process of the above-mentioned design method of the semiconductor integrated circuit device is realized by the computer executing the program and performing the process is included in the embodiment of the present invention.
- the program product there is a computer in which the program itself for realizing the processing of the design method of the semiconductor integrated circuit device described above is read.
- the program product there are a transmission device capable of providing the program to a computer communicably connected via a network, a network system including the transmission device, and the like.
- the program when the supplied program cooperates with the OS (operating system) running in the computer or other application software to realize the processing of the above-mentioned design method of the semiconductor integrated circuit device, the program is also used. It is included in the embodiment of the present invention. Further, even when all or part of the processing of the supplied program is performed by the function expansion board or the function expansion unit of the computer to realize the processing of the design method of the semiconductor integrated circuit device described above, such a program is the present invention. Is included in the embodiment of. Further, in order to use the present invention in a network environment, all or a part of the programs may be executed on another computer.
- FIG. 8 is a diagram showing a configuration example of a computer that can realize the design method of the semiconductor integrated circuit device in the present embodiment.
- a CPU 802, a ROM 803, a RAM 804, a network interface 805, an input device 806, an output device 807, and an external storage device 808 are connected to the bus 801.
- the CPU 802 processes and calculates data, and controls each component connected via the bus 801.
- a boot program is stored in the ROM 803 in advance, and the computer is started by executing the boot program by the CPU 802.
- a computer program is stored in the external storage device 808, and the computer program is copied to the RAM 804 and executed by the CPU 802 to perform, for example, each process of the above-mentioned semiconductor integrated circuit device design method.
- the RAM 804 is used as a work memory for input / output of data, transmission / reception, and temporary storage for controlling each component.
- the external storage device 808 is, for example, a hard disk drive (HDD), a solid state drive (SSD), a CD-ROM, or the like, and the stored contents are not erased even when the power is turned off.
- the network interface 805 is an interface for connecting to a network.
- the input device 806 is, for example, a keyboard, a pointing device (mouse), or the like, and can perform various designations, inputs, and the like.
- the output device 807 is a display, a printer, or the like, and can perform display, printing, and the like.
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Abstract
Description
以下に説明する実施形態において設計対象となる半導体集積回路装置は、電源供給に係る制御が行われる電源ドメインを有する半導体集積回路装置である。電源ドメインでは、チップに配置される回路全体に対して設けられるグローバル電源配線と電源ドメインの回路に対して設けられるローカル電源配線との接続状態を制御する電源スイッチ回路(PSW)を設け、グローバル電源配線とローカル電源配線とを電気的に接続するか否かが制御信号により切り替え可能に構成されている。グローバル電源配線によって供給される電源は、電源スイッチ回路により接続されるローカル電源配線を介して電源ドメインの回路に供給される。
本発明の第1の実施形態について説明する。
図1は、本実施形態における半導体集積回路装置の設計方法の概要を説明する図である。本実施形態における半導体集積回路装置の設計方法は、例えばコンピュータ(設計装置)により実現でき、そのプロセッサ(CPU等)により本実施形態における半導体集積回路装置の設計方法の各処理が実行される。
次に、本発明の第2の実施形態について説明する。
前述した第1の実施形態では、半導体集積回路装置の回路配置領域内のすべての狭小領域に対して、同じ配置パターンで電源スイッチ回路を配置する。以下に説明する第2の実施形態では、狭小領域毎に電源スイッチ回路の配置パターンを個別に決定し、狭小領域毎に他の狭小領域に依存しない配置パターンで電源スイッチ回路を配置する。第2の実施形態では、回路配置領域内の狭小領域毎に、適切な配置パターンで電源スイッチ回路を配置することが可能となる。
図7は、前述した半導体集積回路装置の設計方法に対応するレイアウトを有する半導体集積回路装置の例を説明する図である。半導体集積回路装置の回路配置領域701内にマクロ702が配置され、回路配置領域701内においてマクロ702が配置されていない領域(スタンダードセル配置領域)に電源スイッチ回路(PSW)703が配置されている。分割した領域の幅が狭小領域の判定基準の幅以上である領域(狭小領域以外の領域)Z1、Z2、Z3、Z5では、電源スイッチ回路703は、第1の規則に従って(一例として階段状の配置パターンで)配置される。分割した領域の幅が狭小領域の判定基準の幅未満である領域(狭小領域)Z4、Z6、Z7、Z8では、電源スイッチ回路703は、第1の規則とは異なる規則に従って(一例として列状の配置パターンで)配置される。
Claims (20)
- 複数の電源スイッチ回路が第1の規則に従って配置される半導体集積回路装置の回路配置領域内に、複数のマクロを配置し、
前記回路配置領域内の前記マクロが配置されていない第1の領域から、幅が第1の値未満である狭小領域を検出し、
検出された前記狭小領域に、前記第1の規則とは異なる第2の規則に従って前記電源スイッチ回路を配置し、
前記狭小領域以外の前記第1の領域に、前記第1の規則に従って前記電源スイッチ回路を配置する
ことを特徴とする半導体集積回路装置の設計方法。 - 前記第1の値は、前記電源スイッチ回路の幅、及び前記第1の規則に従って前記電源スイッチ回路が配置される場合の配置間隔の少なくとも一方に基づいて規定された値であることを特徴とする請求項1に記載の半導体集積回路装置の設計方法。
- 前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して配線混雑が発生する場合、前記第1の配置パターンよりも配線リソースが大きい第2の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項1又は2に記載の半導体集積回路装置の設計方法。
- 前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して制約違反となる電源電圧変動が発生する場合、前記第1の配置パターンよりも電源電圧変動が抑制される第3の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項1~3の何れか1項に記載の半導体集積回路装置の設計方法。
- 配置された前記マクロに基づいて前記第1の領域を複数の矩形領域に分割し前記狭小領域の検出を行うことを特徴とする請求項1~4の何れか1項に記載の半導体集積回路装置の設計方法。
- 検出されたすべての前記狭小領域に、同じ配置パターンで前記電源スイッチ回路を配置することを特徴とする請求項1~5の何れか1項に記載の半導体集積回路装置の設計方法。
- 前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して配線混雑が発生しない場合、前記第1の配置パターンよりも電源電圧変動が抑制される第4の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項1、2、5及び6の何れか1項に記載の半導体集積回路装置の設計方法。
- 検出された前記狭小領域毎に、他の前記狭小領域に依存しない配置パターンで前記電源スイッチ回路を配置することを特徴とする請求項1~5の何れか1項に記載の半導体集積回路装置の設計方法。
- 回路配置領域を有する半導体集積回路装置であって、
前記回路配置領域に配置された複数のマクロと、
前記回路配置領域内の前記マクロが配置されていない第1の領域のうち、幅が第1の値未満である狭小領域以外の前記第1の領域に、第1の規則に従って配置された複数の第1の電源スイッチ回路と、
前記第1の領域のうちの前記狭小領域に、前記第1の規則とは異なる第2の規則に従って配置された複数の第2の電源スイッチ回路と
を有することを特徴とする半導体集積回路装置。 - 前記第1の値は、前記第1の電源スイッチ回路の幅、及び前記第1の規則に従って前記第1の電源スイッチ回路が配置される場合の配置間隔の少なくとも一方に基づいて規定された値であることを特徴とする請求項9に記載の半導体集積回路装置。
- すべての前記狭小領域に、同じ配置パターンで前記第2の電源スイッチ回路が配置されていることを特徴とする請求項9又は10に記載の半導体集積回路装置。
- 前記狭小領域毎に、他の前記狭小領域に依存しない配置パターンで前記第2の電源スイッチ回路が配置されていることを特徴とする請求項9又は10に記載の半導体集積回路装置。
- 複数の電源スイッチ回路が第1の規則に従って配置される半導体集積回路装置の回路配置領域内に、複数のマクロを配置する処理と、
前記回路配置領域内の前記マクロが配置されていない第1の領域から、幅が第1の値未満である狭小領域を検出する処理と、
検出された前記狭小領域に、前記第1の規則とは異なる第2の規則に従って前記電源スイッチ回路を配置する処理と、
前記狭小領域以外の前記第1の領域に、前記第1の規則に従って前記電源スイッチ回路を配置する処理と
をコンピュータに実行させるためのプログラム。 - 前記第1の値は、前記電源スイッチ回路の幅、及び前記第1の規則に従って前記電源スイッチ回路が配置される場合の配置間隔の少なくとも一方に基づいて規定された値であることを特徴とする請求項13に記載のプログラム。
- 前記狭小領域に前記電源スイッチ回路を配置する処理では、前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して配線混雑が発生する場合、前記第1の配置パターンよりも配線リソースが大きい第2の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項13又は14に記載のプログラム。
- 前記狭小領域に前記電源スイッチ回路を配置する処理では、前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して制約違反となる電源電圧変動が発生する場合、前記第1の配置パターンよりも電源電圧変動が抑制される第3の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項13~15の何れか1項に記載のプログラム。
- 前記狭小領域を検出する処理では、配置された前記マクロに基づいて前記第1の領域を複数の矩形領域に分割し前記狭小領域の検出を行うことを特徴とする請求項13~16の何れか1項に記載のプログラム。
- 前記狭小領域に前記電源スイッチ回路を配置する処理では、検出されたすべての前記狭小領域に、同じ配置パターンで前記電源スイッチ回路を配置することを特徴とする請求項13~17の何れか1項に記載のプログラム。
- 前記狭小領域に前記電源スイッチ回路を配置する処理では、前記狭小領域に、第1の配置パターンで前記電源スイッチ回路を配置して配線混雑が発生しない場合、前記第1の配置パターンよりも電源電圧変動が抑制される第4の配置パターンに変更し前記電源スイッチ回路を配置することを特徴とする請求項13、14、17及び18の何れか1項に記載のプログラム。
- 前記狭小領域に前記電源スイッチ回路を配置する処理では、検出された前記狭小領域毎に、他の前記狭小領域に依存しない配置パターンで前記電源スイッチ回路を配置することを特徴とする請求項13~17の何れか1項に記載のプログラム。
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JPH0645440A (ja) * | 1992-07-24 | 1994-02-18 | Fujitsu Ltd | 半導体集積回路のレイアウト方法 |
JP2005259879A (ja) * | 2004-03-10 | 2005-09-22 | Sony Corp | 半導体集積回路 |
JP2007258226A (ja) * | 2006-03-20 | 2007-10-04 | Seiko Epson Corp | 半導体集積回路 |
JP2008277788A (ja) * | 2007-04-05 | 2008-11-13 | Nec Electronics Corp | 半導体装置 |
JP2009076501A (ja) * | 2007-09-18 | 2009-04-09 | Sony Corp | 半導体集積回路 |
JP2011222895A (ja) * | 2010-04-14 | 2011-11-04 | Renesas Electronics Corp | 半導体集積回路の設計方法 |
WO2017208888A1 (ja) * | 2016-06-01 | 2017-12-07 | 株式会社ソシオネクスト | 半導体集積回路装置 |
WO2017208887A1 (ja) * | 2016-06-01 | 2017-12-07 | 株式会社ソシオネクスト | 半導体集積回路装置 |
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