JP4190251B2 - Power supply network analysis method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply network analysis in a circuit device, and more particularly to a power supply network analysis in consideration of a power supply network in a circuit block arranged in the circuit device.
[0002]
[Prior art]
In a circuit device typified by a semiconductor integrated circuit device, a plurality of circuit blocks are arranged, and power supply wirings are connected to each other to constitute an entire circuit. Power supply network analysis is performed for the purpose of verifying whether the power supply wiring supplies necessary and sufficient power to each circuit block and can ensure normal operation as a whole.
[0003]
In the power network analysis, ideally, it is necessary to extract a resistance network net list using the resistances on the wiring as resistance elements for all the power wirings wired in the circuit device. Analysis results can be obtained. However, as the circuit scale increases, the processing method of the power supply wiring network in the circuit block has become a problem, and the analysis time and analysis accuracy differ depending on the processing method.
[0004]
The first processing method conventionally performed is a method of extracting a resistance network for power supply wiring in a circuit block as well as power supply wiring between circuit blocks. All power supply wirings can be faithfully modeled into a resistance network netlist, and a highly accurate power supply network analysis is possible.
[0005]
A second processing method that has been conventionally performed is the method disclosed in Patent Document 1. In the method of Patent Document 1, the power supply wiring network is configured by a current source having an equivalent resistance of a power supply wiring for supplying a power supply voltage VDD to each circuit block and a current consumption amount at a power supply terminal of each circuit block.
[0006]
[Patent Document 1]
JP 2000-57186 A (paragraph 0074, FIG. 11)
[0007]
[Problems to be solved by the invention]
However, in the first processing method, since the resistance network is extracted from all the power supply wiring network patterns, a lot of extraction processing time is required, and depending on the circuit scale, an enormous resistance network netlist is formed. The network analysis itself also takes a great deal of processing time. It takes a lot of analysis time and is a problem. Furthermore, there is a limit to the resistance network net list that can perform power supply network analysis in a realistic time, which may limit the circuit scale that can be analyzed.
[0008]
Further, in the second processing method disclosed in Patent Document 1, the current consumption consumed in the circuit block arranged in the circuit device is allocated to each power supply terminal as a current source, and the current consumption in the circuit block is determined. Although the amount is modeled, the power supply wiring in the circuit block is not modeled as a resistance network, so that the power supply current passing through the circuit block is not reflected in the power supply network analysis, which may cause a problem in analysis accuracy.
[0009]
The present invention has been made to solve at least one of the problems of the prior art, and a power supply network having improved analysis accuracy by modeling power supply wiring in a circuit block as a simplified resistance network. It is an object of the present invention to provide a power supply network analysis method capable of performing analysis in a short time.
[0010]
[Means for Solving the Problems]
In order to achieve the object, the power network analysis method according to claim 1 includes at least one circuit block having two or more power terminals including information on a connection position with a power wiring and a connection wiring type. Power supply network analysis by dividing the power supply wiring into resistive elements As an information processing system for computers, an analysis system built using computers In the circuit block, the virtual wiring generation step for generating the virtual power wiring by connecting the power terminals to each other based on the connection wiring type information, and the power wiring and the virtual power wiring are divided into resistance elements in the circuit block. And a resistance net extracting step for extracting a resistance net list.
[0011]
In the power network analysis method according to the first aspect, the virtual power line generation step generates the virtual power line by connecting the power terminals to each other in the circuit block based on the connection wiring type information of the power terminal. The generated virtual power supply wiring is added as a power supply wiring, and the resistance net extraction step divides the power supply wiring and the virtual power supply wiring into resistance elements to extract a resistance net list.
[0012]
Here, when two power supply terminals are opposed to each other on the opposing boundary side of the circuit block, the virtual power supply wiring is generated by connecting the power supply terminals by a straight line portion facing the opposing boundary side. When the two power supply terminals exist in a non-opposing manner, it is preferable that the virtual power supply wiring is generated by connecting the power supply terminals by connecting the straight portions toward the opposing boundary with one or two bent portions. In this case, the bent portion is preferably bent at an angle of 90 ° or 45 °.
[0013]
As a result, the power supply wiring in the circuit block can be extracted as a resistance net list by simplifying the virtual power supply wiring, which is more realistic than when all power supply wirings are extracted as a resistance net list. It is possible to perform power supply network analysis having the required accuracy in analysis time.
[0014]
In addition, since the power supply wiring that passes through the circuit block is modeled as virtual power supply wiring, the power supply current that passes through the circuit block can also be analyzed, compared with the case where the power supply wiring in the circuit block is not considered. Thus, the analysis accuracy can be improved.
[0015]
According to a fourth aspect of the present invention, there is provided a power supply network analyzing method according to the first aspect of the present invention, further comprising a virtual route defining step for defining a virtual route of the virtual power supply wiring. A virtual power supply wiring is generated based on the virtual path.
[0016]
In the power supply network analysis method according to the fourth aspect, the virtual power supply wiring is generated by the virtual wiring generation step after the virtual power supply wiring path is defined as the virtual wiring by the virtual path definition step.
[0017]
As a result, the circuit path of the virtual power supply wiring in the circuit block can be defined in advance as a predetermined path, so that the virtual power supply wiring can be set according to the attribute relating to the power supply wiring in the circuit block, It can contribute to improvement of analysis accuracy.
[0018]
Furthermore, when the straight line portion that extends from the power supply terminal to the opposite boundary side of the circuit block intersects the already wired virtual power supply wiring, the straight line portion that connects the power supply terminal and the virtual power supply wiring is replaced with a new virtual power supply wiring. It is preferable that Thereby, even when there is no connection destination power supply terminal, the virtual power supply wiring for the power supply terminal can be set. Further, even when there is a power supply terminal as a connection destination, a new virtual power supply wiring can be formed with a virtual power supply wiring existing in the vicinity without connecting both power supply terminals.
[0019]
A power supply network analysis method according to claim 5 is the power supply network analysis method according to claim 1, wherein mutual connection wiring types are used between the power supply terminals, between the virtual power supply wirings, or between the power supply terminals and the virtual power supply wiring. Are different from each other, it is characterized in that a connection portion for connecting between connection wiring types is generated in the wiring path. Thereby, wiring paths of different connection wiring types can be handled as one virtual power supply wiring.
[0020]
Here, when the power supply terminals are connected or between the power supply terminals and the virtual power supply wiring, it is only necessary to generate a connection portion in the wiring path of the generated virtual power supply wiring, and the virtual power supply wiring intersects. In such a case, a connection part may be generated in the intersection region of the virtual power supply wiring.
[0021]
Here, as an example of the type of connection wiring, a metal wiring layer used for power supply wiring can be considered. The connection part at this time can be configured to have a contact layer for connecting both connection wiring types. Furthermore, when the contact layer is a via contact layer for connecting different metal wiring layers or different metal wiring layers in which both connection wiring types are separated in multiple layers, stacked via contacts that connect each other through an intermediate layer. Layers are considered.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the power supply network analysis method of the present invention will be described in detail below with reference to FIGS. 1 to 10 and with reference to the drawings.
[0023]
FIG. 1 is a schematic diagram of an arrangement layout showing an example of connection of power supply wirings PL1 to PL7 to circuit blocks A to E (1 to 5). It is a layout schematic diagram represented by the layout of the power supply wiring pattern in a semiconductor integrated circuit. In each of the circuit blocks 1 to 5, power supply terminals TA1 to TE4 are set as connection positions of power supply wirings connected from the outside of the circuit block. In the power supply terminals TA1 to TE4, the wiring type to be connected is specified together with the connection position with the power supply wiring. Here, the wiring type is a type that designates a wiring material such as a metal layer on which a power supply wiring is formed, taking the layout of the semiconductor integrated circuit as an example. Hereinafter, the wiring type is referred to as a wiring layer.
[0024]
Here, the power supply lines PL1 to PL7 are lines for the same power supply, and correspond to, for example, the power supply voltage VCC, the ground voltage GND, and the like. These power supply wirings are connected to the same power supply in the entire circuit device, and are also configured as the same wiring in the circuit blocks 1 to 5 (not shown). Therefore, although the wiring situation in the circuit block is not shown, the power supply terminals in each of the circuit blocks 1 to 5 are generally connected internally. In the present embodiment, the power supply wiring existing in these circuit blocks is virtually generated, and the power supply terminals are connected by the virtual power supply wiring. Hereinafter, the virtual power supply wiring is modeled for each circuit block.
[0025]
FIG. 2 shows the modeling of virtual power supply wiring for the circuit block 1. The circuit block 1 is a case where the two power supply terminals TA1 and TA2 are arranged to face the opposing border sides of the circuit block 1. A straight line directly connecting both power supply terminals TA1 and TA2 is arranged in a direction perpendicular to the boundary side having each power supply terminal.
[0026]
The virtual power supply wiring IL1 generated in this case is a wiring that directly connects the opposing power supply terminals TA1 and TA2. The wiring layer constituting the virtual power supply wiring IL1 is a connection wiring layer with the power supply wirings PL1 and PL2 that the power supply terminals TA1 and TA2 have as terminal attributes. Here, the power supply terminals TA1 and TA2 have the same wiring layer as connection attributes. The power supply terminals TA1 and TA2 of the circuit block 1 are connected by the virtual power supply wiring IL1, and the power supply wiring passing through the circuit block 1 can be modeled.
[0027]
The virtual power supply line IL1 is connected to the power supply terminals TA1 and TA2 having only a straight line portion. Therefore, if the straight line portion is extracted as a resistance element by a known resistance extraction method, the virtual power supply line IL1 can be extracted as one resistance element that connects the power supply terminals TA1 and TA2.
[0028]
When the wiring layers are different as connection attributes between the power supply terminals TA1 and TA2, both wiring layers are connected through the contact layer as described later (FIG. 7).
[0029]
FIG. 3 shows modeling of virtual power supply wiring for the circuit block 2. The circuit block 2 is a case where the two power supply terminals TB1 and TB2 are arranged on the opposing boundary sides of the circuit block 2 so as to be shifted from the opposing positions.
[0030]
The virtual power supply wiring IL2 generated in this case is a wiring that connects the straight portions extending from the opposing power supply terminals TB1 and TB2 toward the opposing boundary via two cranks each bent at 90 °. It becomes. The wiring layer at this time is a connection wiring layer to the power supply wirings PL2 and PL3 that the power supply terminals TB1 and TB2 have as terminal attributes, similarly to the case of the virtual power supply wiring IL1. Here, the case where the power supply terminals TB1 and TB2 have the same wiring layer as a connection attribute is shown. The virtual power supply wiring IL2 connects the power supply terminals TB1 and TB2 of the circuit block 2, and the power supply wiring passing through the circuit block 2 can be modeled.
[0031]
The virtual power line IL2 is connected to the power terminals TB1 and TB2 via two cranks. Therefore, according to a method of extracting one resistance element for the straight line portion by a known resistance extraction method, the virtual power supply line IL2 can be extracted as three resistance elements connecting the power supply terminals TB1 and TB2.
[0032]
In the example of FIG. 3, the crank is bent at 90 °. However, the bending angle of the crank is not limited to 90 °, and it is needless to say that the crank can be configured at an angle of 45 ° or the like. . Further, in the example of FIG. 3, the case where two cranks are provided has been described. However, a configuration having a 90 ° crank at the boundary side where the power supply terminal exists or a configuration having a 45 ° crank in front of the boundary side may be used. For example, the virtual power supply wiring IL2 can be configured by one crank.
[0033]
Similarly to the virtual power supply wiring IL1, when the wiring layers are different as connection attributes between the power supply terminals TB1 and TB2, both wiring layers are connected via the contact layer as described later (FIG. 7). .
[0034]
FIG. 4 shows the modeling of virtual power supply wiring for the circuit block 3. The circuit block 3 is a case where the two power supply terminals TC1 and TC2 are arranged on the opposing boundary sides of the circuit block 3. In this case, the arrangement relationship between the two power supply terminals TC1 and TC2 can be applied in the same manner in either case of facing or non-facing. Further, the present invention can be similarly applied even when the power supply terminal is not on the opposing boundary side. The circuit block 3 includes a circuit region X that performs a critical operation with respect to fluctuations in the power supply voltage supplied by the power supply wiring. For such a circuit region X, it is necessary to supply a power supply voltage whose voltage fluctuation is limited, and it is necessary to accurately verify whether or not the power fluctuation is within the specification range through power network analysis. It becomes. It is necessary to accurately extract the power supply wiring to the circuit region X.
[0035]
In such a case, it is convenient if a predetermined power supply wiring can be defined in advance as a virtual path before generating the virtual power supply wiring. The virtual path IR is a virtual path defined in advance by a designer or the like before generation of virtual power supply wiring. The power supply wiring to the circuit area X is defined in detail. In the generation stage of the virtual power supply wiring, the virtual route IR is generated as it is as the virtual power supply wiring IL3. The power supply terminals TC1 and TC2 are connected, and the power supply wiring path to the circuit region X is traced in detail. At this time, the wiring layers constituting the virtual power supply wiring IL3 are connected to the power supply wirings PL3 and PL4 that the power supply terminals TC1 and TC2 have as terminal attributes, as in the case of the virtual power supply wirings IL1 and IL2. Become. The virtual power supply wiring IL3 connects the power supply terminals TC1 and TC2 of the circuit block 3, and the power supply wiring passing through the circuit block 3 with an accurate power supply wiring to the circuit region X can be modeled.
[0036]
The virtual power supply wiring IL3 is connected to the power supply terminals TC1 and TC2 via four cranks. Therefore, according to a method of extracting one resistance element for the straight line portion by a known resistance extraction method, the virtual power supply wiring IL3 can be extracted as four resistance elements connecting the power supply terminals TC1 and TC2.
[0037]
Further, in the example of FIG. 4, as the reason for predefining the virtual wiring IR, the case where the circuit region X that performs critical circuit operation with respect to fluctuations in the power supply voltage exists in the circuit block 3 is described as an example. Needless to say, the virtual wiring defined before generating the virtual power supply wiring can be applied to cases where it is necessary to previously specify the wiring path of the power supply wiring in the circuit block.
[0038]
Similarly to the virtual power supply wirings IL1 and IL2, when the wiring layers are different as connection attributes between the power supply terminals TC1 and TC2, both wiring layers are connected via the contact layer as described later (FIG. 7). It becomes.
[0039]
FIG. 5 shows modeling of virtual power supply wiring for the circuit block 4. Among the three power supply terminals TD1, TD2, and TD3, the circuit block 4 is arranged on the boundary side where the power supply terminals TD1 and TD2 are opposed to each other and the power supply terminal TD3 is connected to the boundary side that is opposed to each other. It is a case. Although FIG. 5 shows a case where the arrangement relationship between the two power supply terminals TD1 and TD2 is opposed to each other, it goes without saying that the present invention can be similarly applied to a case where they are not opposed to each other.
[0040]
In this case, first, a virtual power supply wiring IL4A that connects the power supply terminals TD1 and TD2 on the opposing boundary is generated. The wiring layer at this time is a connection wiring layer to the power supply wirings PL1 and PL5 that the power supply terminals TD1 and TD2 have as terminal attributes, as in the case of the virtual power supply wirings IL1 to IL3. Here, the case where the power supply terminals TD1 and TD2 have the same wiring layer as connection attributes is shown.
[0041]
As for the power supply terminal TD3, there is no other power supply terminal to be connected. In this case, the wiring path is linearly extended from the power supply terminal TD3 toward the opposing boundary side until it is connected to the virtual power supply wiring IL4A. This wiring path is the virtual power supply wiring IL4B. The power supply terminals TD1 to TD3 of the circuit block 4 are connected by the virtual power supply wiring IL4 generated in a convex shape by connecting the virtual power supply lines IL4A and IL4B, and the power supply wiring passing through the circuit block 4 can be modeled. .
[0042]
The virtual power supply wiring IL4 is configured such that the virtual power supply wiring IL4B is connected at an intermediate point of the virtual power supply wiring IL4A. Therefore, according to a method of extracting up to the connection portion as one resistance element by a known resistance extraction method, the virtual power supply wiring IL4 is extracted as three resistance elements that connect the connection point and each of the power supply terminals TD1 to TD3. can do.
[0043]
Similarly to the virtual power lines IL1 to IL3, when the wiring layers are different as connection attributes between the power terminals TD1 to TD3, both wiring layers are connected via the contact layer as described later (FIG. 7). It becomes.
[0044]
FIG. 6 shows the modeling of virtual power supply wiring for the circuit block 5. The circuit block 5 is a case where among the four power supply terminals TE1 to TE4, the power supply terminals TE1 and TE2 and the power supply terminals TE3 and TE4 are arranged on the boundary sides facing each other. In FIG. 6, the arrangement relationship between the power supply terminals TE1 and TE2 and the power supply terminals TE3 and TE4 shows a case where the power supply terminals TE3 and TE4 are opposed to each other.
[0045]
The power supply terminals TE1 and TE2 and the power supply terminals TE3 and TE4 on the boundary sides facing each other are connected to generate virtual power supply lines IL5A and IL5B. The wiring layers at this time are the same as those of the virtual power supply wirings IL1 to IL4B, with the power supply terminals PL1 and TE7 and the power supply wirings PL5 and PL7 and the power supply wirings PL3 and PL6 that the power supply terminals TE3 and TE4 have as terminal attributes. It becomes a connection wiring layer. Here, the case where each power supply terminal TE1 to TE4 has the same wiring layer as a connection attribute is shown.
[0046]
Virtual power supply lines IL5A and IL5B generated by connecting two sets of power supply terminals intersect at an intermediate point. Since both the virtual power supply lines IL5A and IL5B are configured by the same wiring layer, the virtual power supply lines IL5A and IL5B are connected in the intersection region, and the virtual power supply line IL5 is generated. The power supply terminals TE1 to TE4 of the circuit block 5 are connected, and the power supply wiring passing through the circuit block 5 can be modeled.
[0047]
The virtual power supply wiring IL5 is configured to be connected at the intersection region between the two. Therefore, according to a method of extracting up to the intersection region as a single resistance element by a known resistance extraction method, the virtual power wiring IL5 is extracted as four resistance elements connecting the intersection region and the power supply terminals TE1 to TE4. can do.
[0048]
Similarly to the virtual power supply wirings IL1 to IL4B, when the wiring layers are different as connection attributes between the power supply terminals TE1 to TE4, both wiring layers are connected via the contact layer as described later (FIG. 7). It becomes.
[0049]
Next, generation of virtual power supply lines when the power supply terminals to be connected to each other, between virtual power supply lines, or between the power supply terminals and the virtual power supply terminals are configured with different wiring layers will be described. If the wiring layers are different from each other, they cannot be connected as they are. Therefore, it is convenient to connect both wiring layers by arranging a contact layer connecting the wiring layers on the wiring system path.
[0050]
FIG. 7A shows a case where the power supply terminals are connected. When the terminal attributes of each power supply terminal are composed of different wiring layers M1 and M2, it is possible to generate a contact layer C1 on a virtual power supply wiring that connects both power supply terminals and connect the two wiring layers.
[0051]
FIG. 7B shows a case where a virtual power supply line is newly connected from a power supply terminal to a virtual power supply line that has already been generated. When the wiring layer M2 that the power supply terminal has as a terminal attribute is different from the wiring layer M1 of the virtual power supply wiring that has already been generated, the contact layer C1 is generated on the connection point of both virtual power supply wirings or on the new virtual power supply wiring Thus, both wiring layers can be connected.
[0052]
FIG. 7C shows a case where virtual power supply wirings are connected. When each virtual power supply wiring has different wiring layers M1 and M2, a contact layer C1 can be generated in the intersecting region of both virtual power supply wirings to connect the two wiring layers.
[0053]
Here, the contact layer C1 has a structure in which the wiring layer M1 and the wiring layer M2 are physically connected, and a via contact layer or a stacked via contact layer is formed by a combination of the wiring layers M1 and M2. Can be applied. Here, the stacked via contact layer refers to both via one or more wiring layers arranged in the middle of the wiring layers to be connected among the via contact layers for connecting the wiring layers separated from each other by two or more layers. A contact layer configured to connect wiring layers.
[0054]
FIG. 8 shows a result of modeling the power supply wiring in the circuit blocks 1 to 5 in the circuit device shown in FIG. 1 by the virtual power supply wiring generation method individually described in FIG. 2 to FIG. The power supply lines PL1 to PL7 connected to the power supply terminals of each block are connected to each other across the circuit block by virtual power supply lines IL1 to IL5 in the circuit block. Thereby, the path of the power supply current flowing through the circuit block is modeled, and the power supply network analysis can be performed with high accuracy.
[0055]
Although not shown, the power supply wiring network including the virtual power supply wiring shown in FIG. 8 is modeled into a resistance network netlist by an existing resistance network extraction method. Further, according to the existing current source setting method described in Patent Document 1 and the like, a current source corresponding to the power supply current consumed by the circuit block or the like is connected to each node of the modeled resistance net list. The
[0056]
FIG. 9 shows a power supply network analysis apparatus 10 that embodies the power supply network analysis method described above. In the power supply network analyzing apparatus 10 of FIG. 9, a memory 30, a magnetic disk device 40, and a display device (hereinafter abbreviated as CRT) are provided via a bus 80 with a central processing unit (hereinafter abbreviated as CPU) 20 as a center. 50), a keyboard 60, and an external storage medium driving device 70 are connected to each other, and an external storage medium 90 such as a CDROM or a magnetic medium is detachably installed in the external storage medium driving device 70.
[0057]
A computer program for executing a power supply network analysis flow shown in FIG. 10 to be described later is recorded in the memory 30 and the magnetic disk device 40 in the power supply network analysis device 10 and also in an external storage medium 90 such as a CDROM or a magnetic medium. If recorded, it is recorded in the memory 30 and the magnetic disk device 40 via the external storage medium driving device 70 or directly transferred to the CPU 20. It can also be transmitted via a communication line (not shown) such as the Internet.
[0058]
Also, a storage unit D1 storing chip layout data such as power supply wiring arrangement information and a storage unit storing a resistance net list extracted from the power supply wiring network on the chip, as shown in the analysis flow of FIG. D2, a storage unit D3 for storing data such as power supply terminal information for the circuit block arranged on the chip, and a resistance network for the virtual power supply wiring network virtually generated based on the power supply terminal information in the circuit block The storage unit D4 in which the netlist is stored is recorded in the magnetic disk device 40, an external storage medium 90 such as a CDROM or a magnetic medium, and is referred to as needed by a command from the CPU 20 according to the processing of the computer program. The Then, the analysis result of the power supply network analysis according to the program for executing the power supply network analysis flow shown in FIG. 10 is confirmed by confirmation means such as the CRT 50. In addition to the input of the analysis procedure, correction of the wiring width and the routing route of the power supply wiring with respect to the analysis result is performed according to an input instruction from the keyboard 60 or the like. The analysis result is recorded in the external storage medium 90 such as a CDROM or a magnetic medium via the magnetic disk device 40 or the external storage medium driving device 70 as the storage unit D5.
[0059]
FIG. 10 is a power supply network analysis flow in which the power supply network analysis is performed on the layout data of the semiconductor integrated circuit. The power supply network extracted from the chip layout data stored in the storage unit D1 is divided into resistance elements by an existing method, and a resistance network netlist is extracted (S1). The extracted resistance net list is stored in the storage unit D2. In addition, as disclosed in Patent Document 1 or the like as necessary, a power source current consumed outside the circuit block is used as a current source for each power source wiring divided by a bent portion, an intersection region, or a contact layer. You may make it model and connect.
[0060]
On the other hand, a virtual power supply wiring generation process is performed on the power supply terminal information extracted from the circuit block data stored in the storage unit D3 (S2) (S3). Here, the individual generation processing shown in FIGS. 2 to 7 is performed based on the power supply terminal information. For example, the virtual power supply wiring for connecting the power supply terminals is generated based on the modeling of the virtual power supply wiring shown in FIGS. 2 to 4 as a basic process, and the processes of FIGS. 5 to 7 are performed as necessary. As a result, virtual power supply wiring that is efficiently connected in the circuit block is generated. Eventually, virtual power supply lines connected to each other as one power supply node through the bent portion, the intersecting region, or the contact layer are generated.
[0061]
The generated virtual power wiring network is divided into resistance elements by an existing method, and a resistance net list is extracted (S4). At this time, as disclosed in Patent Document 1 and the like, the power source current consumed in the circuit block is used as the current source for each virtual power source wiring divided by the bent portion, the intersecting region, or the contact layer. You may make it model and connect. The extracted resistance net list is stored in the storage unit D4.
[0062]
The resistance network net list for the power supply wiring network outside the circuit block stored in the storage unit D2 and the resistance network net list for the virtual power supply wiring network in the circuit block stored in the storage unit D4 Power supply network analysis is performed (S6). The analyzed result is stored in the storage unit D5.
[0063]
As described above in detail, in the power supply network analysis method according to the present embodiment, the power supply wiring in the circuit blocks 1 to 5 can be simplified and extracted as the resistance network netlist by the virtual power supply wirings IL1 to IL5. Compared with the case where all the power supply wirings are extracted as a resistance network netlist, it is possible to perform a power supply network analysis having a necessary accuracy in a realistic analysis time. Even if the circuit scale of the circuit blocks 1 to 5 provided in the circuit device or the increase in the number of circuit blocks is not limited, the analysis time is not limited, and effective power supply network analysis is performed even for a large-scale circuit. Can do.
[0064]
Further, since the power supply wiring passing through the circuit blocks 1 to 5 is modeled as virtual power supply wirings IL1 to IL5, the power supply current passing through the circuit blocks 1 to 5 can be analyzed, and the circuit block 1 The analysis accuracy can be improved as compared with the case where the power source wirings in 5 to 5 are not considered.
[0065]
In addition, since the circuit path of the virtual power supply wiring IL3 in the circuit block 3 can be defined in advance as a virtual wiring IR as a predetermined wiring path, the virtual power supply wiring in accordance with the attribute relating to the power supply wiring in the circuit block 3 IL3 can be set, which can contribute to improvement of analysis accuracy.
[0066]
Further, when the straight line portion from the power supply terminal TD3 toward the opposing boundary of the circuit block 4 intersects the already wired virtual power supply wiring IL4A, the straight line portion connecting the power supply terminal TD3 and the virtual power supply wiring IL4A is set. A new virtual power supply wiring IL4B can be obtained. Thereby, even when there is no power supply terminal to be connected, the virtual power supply wiring IL4B for the power supply terminal TD3 can be set. Further, even when there is a power supply terminal to be connected, it is possible to configure a virtual power supply wiring with a virtual power supply wiring existing in the vicinity without connecting both power supply terminals.
[0067]
Also, different wiring layers can be handled as one virtual power supply wiring if they are connected by a connecting portion such as a contact layer. The power supply wiring in the circuit block can be modeled as a virtual power supply wiring having a simplified configuration.
[0068]
The present invention is not limited to the above-described embodiment, and it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention.
For example, in this embodiment, a semiconductor integrated circuit is described as a representative example of the circuit device. However, the present invention is not limited to this, and other circuit devices such as a circuit device configured on a circuit board are used. The same applies to the case.
In addition, although the present embodiment has been illustrated for one type of power supply wiring, it goes without saying that the power supply wiring can be sequentially applied to each power supply wiring even when a plurality of power supply wirings exist.
Furthermore, although there is no particular mention about the wiring width of the virtual power supply wiring that connects between the power supply terminals, etc., if the wiring width of the power supply terminals connected to each other is the same as the terminal attribute, the connection is made with the power supply width. That's fine. Further, when connecting power supply terminals having different wiring widths, it is possible to connect with any narrow wiring width, or to change the wiring width in the middle of the virtual power supply wiring. In the latter case, it is preferable to extract the resistance element with the line width switching point as a boundary. This is because the sheet resistance of the virtual power supply wiring is different before and after that.
[0069]
Here, means for solving the problems in the prior art based on the technical idea of the present invention are listed below.
(Supplementary note 1) For a circuit device in which at least one circuit block having two or more power supply terminals including information on the connection position with the power supply wiring and the type of connection wiring is arranged, the power supply wiring is divided into resistance elements. Power network analysis method for performing power network analysis
In the circuit block, a virtual wiring generation step of generating a virtual power wiring by mutually connecting the power terminals based on the information of the connection wiring type,
A power network analysis method, comprising: a resistance network extraction step of extracting a resistance network net list by dividing the power supply wiring and the virtual power supply wiring into resistance elements.
(Supplementary Note 2) When the two power supply terminals are opposed to each other on the opposing boundary sides of the circuit block, the virtual wiring generation step connects the power supply terminals with a straight line portion that faces the opposing boundary sides. The power supply network analysis method according to appendix 1, wherein the virtual power supply wiring is generated by doing so.
(Supplementary Note 3) When the two power supply terminals exist in a non-opposing manner on the opposing boundary sides of the circuit block, the virtual wiring generation step may be configured by bending one or two straight portions toward the opposing boundary sides. The power supply network analysis method according to appendix 1, wherein the virtual power supply wiring is generated by connecting the power supply terminals by connecting each other.
(Supplementary note 4) The power network analysis method according to supplementary note 3, wherein the bent portion is bent at an angle of 90 ° or 45 °.
(Additional remark 5) It has a virtual path | route definition step which defines the virtual path | route of the said virtual power supply wiring, In the said virtual wiring generation step, the said virtual power supply wiring is produced | generated based on the defined said virtual path | route. The power supply network analysis method according to 1.
(Supplementary Note 6) When a straight line portion extending from the power supply terminal to the opposing boundary of the circuit block intersects the already wired virtual power supply line, the straight line portion connecting the power supply terminal and the virtual power supply line is The power network analysis method according to appendix 1, wherein the power network analysis method generates a new virtual power wiring.
(Appendix 7) When the connection wiring types are different in connection between the power supply terminals, between the virtual power supply wirings, or between the power supply terminals and the virtual power supply wirings, the connection wiring types are connected in a wiring path. The power network analysis method according to appendix 1, wherein a connection part is generated.
(Supplementary Note 8) When the connection wiring types are different from each other, between the power supply terminals, or when the power supply terminal and the virtual power supply wiring are connected, the connection portion is generated in the wiring path of the generated virtual power supply wiring The power supply network analysis method according to appendix 7, wherein:
(Supplementary note 9) The power supply network analysis method according to supplementary note 7, wherein, when the virtual power supply lines generated by the different connection wiring types intersect, the connection part is generated in a crossing region of the virtual power supply lines. .
(Supplementary Note 10) With respect to a circuit device in which at least one circuit block having two or more power supply terminals including information on a connection position with power supply wiring and connection wiring type is arranged, the power supply wiring is divided into resistance elements. A computer program for performing power supply network analysis,
In the circuit block, a virtual wiring generation step of generating a virtual power wiring by mutually connecting the power terminals based on the information of the connection wiring type,
A computer program for executing a power supply network analysis including a resistance network extraction step of extracting a resistance network netlist by dividing the power supply wiring and the virtual power supply wiring into resistance elements.
(Supplementary Note 11) With respect to a circuit device in which at least one circuit block having two or more power supply terminals including information on the connection position with the power supply wiring and the type of connection wiring is arranged, the power supply wiring is divided into resistance elements. A power supply network analysis device for performing power supply network analysis,
In the circuit block, a virtual wiring generation step of generating a virtual power wiring by mutually connecting the power terminals based on the information of the connection wiring type,
A power supply network analysis apparatus comprising: a resistance network extraction step of extracting a resistance network netlist by dividing the power supply wiring and the virtual power supply wiring into resistance elements.
[0070]
【The invention's effect】
According to the present invention, the power supply wiring in the circuit block is modeled by the simplified virtual power supply wiring, and the resistance network is extracted from the virtual power supply wiring, so that the power supply network analysis with improved analysis accuracy can be performed in a short time. It is possible to provide a power supply network analysis method that can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic layout diagram showing connections between power supply wirings and circuit blocks.
FIG. 2 is a diagram showing modeling (1) of virtual power supply wiring.
FIG. 3 is a diagram showing modeling (2) of virtual power supply wiring.
FIG. 4 is a diagram showing modeling (3) of virtual power supply wiring.
FIG. 5 is a diagram showing modeling (4) of virtual power supply wiring.
FIG. 6 is a diagram showing modeling (5) of virtual power supply wiring.
FIG. 7 is a diagram showing a case where a contact layer is provided.
FIG. 8 is a schematic layout diagram showing the power supply wiring network according to the present embodiment.
FIG. 9 is a configuration diagram of a power network analyzer according to the present embodiment.
FIG. 10 is a flowchart of this embodiment.
[Explanation of symbols]
1 to 5 circuit blocks A to E
10 Power supply network analyzer
C1 contact layer
IL1 to IL5, IL4A, IL4B, IL5A, IL5B
Virtual power supply wiring
IR virtual route
M1, M2 wiring layer
PL1 to PL7 power supply wiring
TA1 to TE4 power supply terminals
X circuit area

Claims (6)

For a circuit device in which at least one circuit block having two or more power supply terminals including information on a connection position with a power supply wiring and connection wiring type is arranged, the power supply wiring is divided into resistance elements and a power supply network A power supply network analysis method for performing analysis as information processing of the computer in an analysis system constructed using a computer ,
In the circuit block, a virtual wiring generation step of generating a virtual power wiring by mutually connecting the power terminals based on the information of the connection wiring type,
A power network analysis method, comprising: a resistance network extraction step of extracting a resistance network net list by dividing the power supply wiring and the virtual power supply wiring into resistance elements.   When the two power supply terminals are opposed to each other on the opposing boundary sides of the circuit block, the virtual wiring generation step is performed by connecting the power supply terminals by connecting the power supply terminals at a straight line portion that faces the opposing boundary sides. 2. The power network analysis method according to claim 1, wherein virtual power wiring is generated.   When the two power supply terminals are not opposed to each other on the opposing boundary sides of the circuit block, the virtual wiring generation step connects the straight line portions facing the opposing boundary sides with one or two bent portions. The power supply network analysis method according to claim 1, wherein the virtual power supply wiring is generated by connecting the power supply terminals.   2. The virtual path defining step for defining a virtual path of the virtual power supply wiring, wherein the virtual power supply wiring is generated based on the defined virtual path in the virtual wiring generation step. Power network analysis method.   When the connection wiring types are different in connection between the power supply terminals, between the virtual power supply wirings, or between the power supply terminals and the virtual power supply wirings, a connection part that connects the connection wiring types in the wiring path is generated. The power network analysis method according to claim 1, wherein: The wiring type of the virtual power supply wiring is the same wiring type as the power supply wiring selected based on the information of the connection wiring type, and the virtual power supply wiring is connected to the power supply wiring via the power supply terminal. The power supply network analysis method according to claim 1, wherein

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