CN110083942B - Signal electromigration batch repairing method, system and medium based on physical information - Google Patents
Signal electromigration batch repairing method, system and medium based on physical information Download PDFInfo
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- CN110083942B CN110083942B CN201910349990.2A CN201910349990A CN110083942B CN 110083942 B CN110083942 B CN 110083942B CN 201910349990 A CN201910349990 A CN 201910349990A CN 110083942 B CN110083942 B CN 110083942B
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- G06F30/39—Circuit design at the physical level
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Abstract
The invention discloses a signal electromigration batch repair method, a system and a medium based on physical information, the implementation steps of the invention comprise: for each current signal electromigration, if a violation path is on a data path, inserting a buffer unit in the middle of the data path when the fan-out path is a single fan-out path; otherwise, when the fan-out path is a multi-fan-out path, inserting a buffer unit at the specified position of the starting point side of the data path; if the violation path is on the clock path, deleting the original violation metal layer and setting a new metal winding rule; finally, equivalence checking, rerouting and signal electromigration checking are carried out to determine whether to continue the modification or end the repair process. The invention realizes automatic analysis, automatic classification and automatic repair, saves a large amount of labor cost and time cost, and shortens the design iteration cycle.
Description
Technical Field
The invention relates to the field of physical design of a super-large-scale integrated circuit, in particular to a signal electromigration batch repairing method, a signal electromigration batch repairing system and a signal electromigration batch repairing medium based on physical information.
Background
As the feature size of integrated circuits is continuously reduced, the cross-sectional area of the metal film of the interconnection line is also smaller and smaller, the current density borne by the metal film is increased sharply, and the failure of the interconnection caused by Electromigration (EM) is increased increasingly. In the early process nodes, only Power electromigration (Power EM) is usually focused, but in the process nodes below 28nm, the width of the interconnection line is further reduced, the routing length is longer, and the Signal frequency is higher, so that the Signal electromigration (Signal EM) problem is increasingly prominent, and the Signal EM problem becomes an important problem to be solved in the integrated circuit layout and routing stage. At present, a signal electromigration repairing method mainly adopts manual strip-by-strip analysis and repairing, a batch automatic processing method is lacked, the repairing efficiency is low, multiple iterations are needed, the manpower cost and the time cost are seriously wasted, and the chip design period is influenced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the invention provides a signal electromigration batch repairing method, a system and a medium based on physical information.
In order to solve the technical problems, the invention adopts the technical scheme that:
a signal electromigration batch repairing method based on physical information comprises the following implementation steps:
1) Generating a signal electromigration violation set to be repaired aiming at an input signal electromigration report, and traversing and selecting one piece of signal electromigration violation information from the signal electromigration violation set as current signal electromigration;
2) Judging whether the violating path of the current signal electromigration is on a data path or a clock path, and jumping to execute the step 3 if the violating path is on the data path); jumping to execute step 4) if the violation path is on the clock path;
3) Judging whether the data path is a single fan-out path or not, and inserting a buffer unit in the middle of the data path if the data path is the single fan-out path; otherwise, inserting a buffer unit at the specified position of the starting point side of the data path; skipping to execute the step 5);
4) Deleting the original violating metal layer and setting a new metal winding rule; skipping to execute step 5);
5) Judging whether the signal electromigration violation set is processed, if not, traversing and selecting the next current signal electromigration from the signal electromigration violation set, and skipping to execute the step 2); otherwise, skipping to execute the step 6);
6) Carrying out equivalence checking on the repaired signal electromigration report;
7) Rewinding, carrying out signal electromigration check, adding the signal electromigration information with the signal electromigration violation into the signal electromigration violation set if the detection is not passed, traversing and selecting one signal electromigration violation information from the signal electromigration violation set as the current signal electromigration, and skipping to execute the step 2); if the detection passes, the process is ended and exits.
Preferably, the detailed step of inserting the buffer unit at the middle position of the data path in the step 3) includes: and acquiring physical attributes of the violation path-related unit and the interconnection line, wherein the physical attributes comprise a name and a position, then determining the intermediate position of the data path according to the acquired unit and line positions, and then inserting buffer units with preset size, type and number into the intermediate position of the data path.
Preferably, the detailed step of inserting the buffer unit at the designated position on the starting point side of the data path in step 3) includes:
s1) judging the fan-out number of the data path, and if the fan-out number is equal to 2, skipping to execute the step S2); otherwise, if the fan-out number is larger than 2, skipping and executing the step S3);
s2) obtaining physical attributes of the violation path related unit and the interconnection line, wherein the physical attributes comprise names and positions, then determining the position of each fan-out point of the data path according to the obtained positions of the units and the lines, and inserting buffer units with preset sizes, types and numbers in front of each fan-out point; ending;
s3) judging the distribution condition of the fan-out units of the data path, and if the fan-out units are distributed on one side of the fan-out point or more than three quarters of the fan-out units are distributed on one side of the fan-out point, skipping to execute the step S4); otherwise, skipping to execute the step S5);
s4) inserting buffer units with preset size, type and number into a common path or a driving unit of a fan-out point; finishing;
s5) grouping and inserting all fan-outs into buffer units with preset size, type and number; and (6) ending.
Preferably, the detailed steps of step S4) include: acquiring physical attributes of the violation path related unit and the interconnection line, wherein the physical attributes comprise a name, a position and a position of a common path bifurcation point, then determining a buffer unit insertion position according to the acquired position of the common path bifurcation point or the position of a starting point, and inserting buffer units with preset size, type and quantity into the buffer unit insertion position; and (6) ending.
Preferably, the detailed steps of step S5) include: acquiring physical attributes of the violation path related units and the interconnection lines, wherein the physical attributes comprise names, positions and positions of common path bifurcation points, then judging the relative positions of each fan-out point and the common path bifurcation points, grouping all the fan-out points according to the relative positions of each fan-out point and the common path bifurcation points, and the grouping principle is that the relative positions of each fan-out point and the common path bifurcation points are relatively concentrated, determining the insertion positions of buffer units in each group of the fan-out points, and inserting the buffer units with preset sizes, types and numbers in the insertion positions of the buffer units; and (6) ending.
Preferably, the detailed steps of step 4) include: firstly, obtaining the physical attributes of the line related to the violated route, wherein the physical attributes comprise a name, a position, a metal layer and a metal winding rule, deleting the metal layer which is violated only by signal electromigration, then creating a new metal winding rule according to the existing metal winding rule, setting only the line width and the space of the new metal winding rule, and changing the line width and the space of the metal layer according to the new metal winding rule by a tool in a winding way; jump execution step 5).
The invention also provides a signal electromigration batch repair system based on the physical information, which comprises a computer device, wherein the computer device is programmed to execute the steps of the signal electromigration batch repair method based on the physical information.
The invention also provides a signal electromigration batch repair system based on physical information, which comprises a computer device, wherein a storage medium of the computer device is stored with a computer program programmed to execute the signal electromigration batch repair method based on physical information.
The present invention also provides a computer readable storage medium having stored thereon a computer program programmed to execute the aforementioned physical information-based signal electromigration bulk repair method of the present invention.
Compared with the prior art, the invention has the following advantages: the signal electromigration batch automatic restoration method based on the physical information can rapidly analyze, position and summarize the signal electromigration violation condition, classify the violation path and obtain all physical information related to the violation path, thereby providing a corresponding solution, finally restoring the signal electromigration violation and ensuring the equivalence of the design before and after restoration, completely solving the manpower cost and time cost wasted in restoring the signal electromigration problem, effectively reducing the design iteration times and shortening the design iteration period.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
FIG. 2 is an example of electromigration repair of a signal for a single fan-out path in a data path according to an embodiment of the present invention.
FIG. 3 is an exemplary first signal electromigration repair equation for a multi-fan-out path in a data path according to an embodiment of the present invention.
FIG. 4 is an exemplary second signal electromigration repair equation for a multi-fan-out path in a data path according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an exemplary electromigration repair of a clock path according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the signal electromigration batch repair method based on physical information in this embodiment include:
1) Generating a Signal electromigration Violation set to be repaired aiming at an input Signal electromigration Report (Signal EM visualization Report, in the embodiment, the Signal electromigration data of the Signal electromigration Report is provided by a Red Hawk tool), and traversing and selecting one piece of Signal electromigration Violation information from the Signal electromigration Violation set as the current Signal electromigration;
2) Judging whether the violating path of the current signal electromigration is on a data path (data path) or a clock path (clock path), and jumping to execute the step 3 if the violating path is on the data path; jumping to execute step 4) if the violation path is on the clock path; the signal electromigration violation has randomness, and can occur on a data path and a clock path, but due to the particularity of the clock path, when the signal electromigration violation is repaired on the clock path, a unit can not be randomly inserted, otherwise, the great influence can be caused on the sequence, so that different repairing methods can be set when the data path and the clock path are repaired by the signal electromigration violation;
3) Judging whether the data path is a single fan-out path or not, and inserting a buffer unit (buffer) in the middle position of the data path if the data path is the single fan-out path; otherwise, inserting a buffer unit (buffer) at the specified position of the starting point side of the data path; skipping to execute the step 5);
4) Deleting the original violating metal layer and setting a new metal winding rule (NDR rule); skipping to execute the step 5);
5) Judging whether the signal electromigration violation set is processed completely, if not, traversing and selecting the next current signal electromigration from the signal electromigration violation set, and jumping to execute the step 2); otherwise, skipping to execute the step 6);
6) Carrying out equivalence check on the repaired signal electromigration report;
7) Rewinding, performing Signal electromigration check (Signal EM check), if the detection fails, adding the Signal electromigration information which is violated by the Signal electromigration into the Signal electromigration violation set, traversing and selecting one piece of Signal electromigration violation information from the Signal electromigration violation set as the current Signal electromigration, and skipping to execute the step 2); if the detection passes, the process is ended and exits.
In this embodiment, the detailed step of inserting the buffer unit in the middle position of the data path in step 3) includes: and acquiring physical attributes of the violation path-related unit and the interconnection line, wherein the physical attributes comprise a name and a position, then determining the intermediate position of the data path according to the acquired unit and line positions, and then inserting buffer units with preset size, type and number into the intermediate position of the data path. FIG. 2 illustrates the signal electromigration repair principle of a single fan-out path, wherein a circle represents a starting point (start _ point) cell, and the physical coordinates of the cell are (x 1, y 1); a fork represents an end point (end _ point) cell, the physical coordinates of which are (x 2, y 2); the connecting line between the start point unit and the end point unit represents an interconnection line (net), the triangle represents an inserted buffer unit (buffer), and the physical coordinates of the buffer unit are calculated from the physical coordinates of the start point and the end point. If the fan-out number is 1, the path is a single fan-out path, the repair method is to insert a buffer in the middle of the path, and the specific implementation method is as follows: firstly, obtaining the physical attributes of the violation path related unit and the related interconnection line, including the name and the position, and then determining the specific position of the insertion buffer unit according to the obtained unit and the interconnection line position; the size, type, and number of buffer cells inserted can be adjusted by the designer according to the design features and the existing timing conditions.
In this embodiment, the detailed step of inserting the buffer unit at the designated position on the starting point side of the data path in step 3) includes:
s1) judging the fan-out number of the data path, and if the fan-out number is equal to 2, skipping to execute the step S2); otherwise, if the fan-out number is larger than 2, skipping and executing the step S3);
s2) acquiring physical attributes of the violating path related units and the interconnection lines, wherein the physical attributes comprise names and positions, then determining the position of each fan-out point of the data path according to the acquired positions of the units and the lines, and inserting buffer units with preset sizes, types and numbers in front of each fan-out point; finishing;
s3) judging the distribution condition of the fan-out units of the data path, and if the fan-out units are distributed on one side of the fan-out point or more than three quarters of the fan-out units are distributed on one side of the fan-out point, skipping to execute the step S4); otherwise, skipping to execute the step S5);
s4) inserting buffer units with preset size, type and number into a common path or a driving unit of a fan-out point; finishing;
s5) grouping and inserting all fan-outs into buffer units with preset size, type and number; and (6) ending.
In this embodiment, the detailed step of step S4) includes: acquiring physical attributes of the violation path related unit and the interconnection line, wherein the physical attributes comprise a name, a position and a position of a common path bifurcation point, then determining a buffer unit insertion position according to the acquired position of the common path bifurcation point or the position of a starting point, and inserting buffer units with preset size, type and quantity into the buffer unit insertion position; and (6) ending. As shown in fig. 3, in the case where the fan-out units are distributed on one side of the fan-out point or more than three quarters of the fan-out units are distributed on one side of the fan-out point, the repair method is to insert a buffer unit on a common path (common path) or a drive unit (start point) of the fan-out point.
In this embodiment, the detailed step of step S5) includes: acquiring physical attributes of the violation path related units and the interconnection lines, wherein the physical attributes comprise names, positions and positions of common path bifurcation points, then judging the relative positions of each fan-out point and the common path bifurcation points, grouping all the fan-out points according to the relative positions of each fan-out point and the common path bifurcation points, and the grouping principle is that the relative positions of each fan-out point and the common path bifurcation points are relatively concentrated, determining the insertion positions of buffer units in each group of the fan-out points, and inserting the buffer units with preset sizes, types and numbers in the insertion positions of the buffer units; and (6) ending. As shown in fig. 4, for the case that the fan-out units are distributed around the fan-out point and are not uniformly distributed, the repair method is to insert all the fan-out units into the buffer units in groups.
As described above, if the fan-out is 2, this path is two fan-out paths, the repair method is to insert a buffer unit before each fan-out point, and the difference from the single fan-out path repair method is that the position of inserting the buffer unit is different and is determined by the position of the fan-out point, and is not the middle of the path, and the specific implementation method is: the physical properties, including the name and the position, of the violation path-related unit and the related interconnection line are firstly obtained, and then the specific position of each fan-out needing to be inserted into the buffer unit is determined according to the obtained unit and interconnection line positions. If the fan-out is larger than 2, the path is a multi-fan-out path, and according to the position distribution of the fan-out units, the repairing method has two types: as shown in fig. 3, for the case that the fan-out units are distributed on one side of the fan-out point or more than three quarters of the fan-out units are distributed on one side of the fan-out point, the repair method is to insert a buffer unit on the common path (common path) or the driving unit (start point) of the fan-out point; as shown in fig. 4, for the case that the fan-out units are distributed around the fan-out point and are not uniformly distributed, the repair method is to perform block insertion on all the fan-outs by using buffer units; the first repair method is specifically realized as follows: the physical properties of the violation path related unit and the related interconnection line, including the name, the position and the position of the common path bifurcation point, are firstly obtained, and then the specific position where the buffer unit needs to be inserted is determined according to the position of the common path or the starting point. The second repair method is specifically realized as follows: firstly, obtaining the physical attributes of the violating path related unit and the related interconnecting line, including the name, the position and the position of a common path bifurcation point, then judging the relative position of each fan-out point and the common path bifurcation point, grouping all the fan-out points according to the relative position, wherein the grouping principle is that the relative positions are relatively concentrated, and finally, independently inserting a buffer unit into all the groups.
In this embodiment, the detailed steps of step 4) include: firstly, obtaining the physical attributes of the line related to the violated route, wherein the physical attributes comprise a name, a position, a metal layer and a metal winding rule, deleting the metal layer which is violated only by signal electromigration, then creating a new metal winding rule according to the existing metal winding rule, setting the line width and the space of the new metal winding rule only (a designer can adjust according to the design characteristics and the existing time sequence situation), and changing the line width and the space of the metal layer according to the new metal winding rule by using a tool in a self-winding way; jump execution step 5). As shown in fig. 5, only the metal layer in which electromigration of signals violates, the width of the metal layer is d according to the conventional metal routing rule, and the width of the metal layer is changed to 2d according to the new metal routing rule.
The signal electromigration batch repairing method based on the physical information is a parameterized method, and can be used for different modules and different designs by adjusting parameters, so that the signal electromigration violation conditions can be quickly analyzed, positioned and summarized, the violation paths are classified, all physical information related to the violation paths is obtained, a corresponding solution is given, the signal electromigration violation is finally repaired, the equivalence of the design before and after the repair is ensured, the manpower cost and the time cost wasted on the signal electromigration repair problem are completely solved, the design iteration times are effectively reduced, and the design iteration period is shortened.
In addition, the present embodiment further provides a signal electromigration batch repair system based on physical information, which includes a computer device programmed to execute the steps of the signal electromigration batch repair method based on physical information according to the present embodiment. The embodiment also provides a signal electromigration batch repair system based on physical information, which comprises a computer device, wherein a storage medium of the computer device is stored with a computer program programmed to execute the signal electromigration batch repair method based on physical information. The present embodiment also provides a computer-readable storage medium, which stores thereon a computer program programmed to execute the foregoing physical information-based signal electromigration bulk repair method of the present embodiment.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A signal electromigration batch repairing method based on physical information is characterized by comprising the following implementation steps:
1) Generating a signal electromigration violation set to be repaired aiming at an input signal electromigration report, and traversing and selecting one piece of signal electromigration violation information from the signal electromigration violation set as current signal electromigration;
2) Judging whether the violating path of the current signal electromigration is on a data path or a clock path, and jumping to execute the step 3 if the violating path is on the data path); jumping to execute step 4) if the violation path is on the clock path;
3) Judging whether the data path is a single fan-out path or not, and inserting a buffer unit in the middle of the data path if the data path is the single fan-out path; otherwise, inserting a buffer unit at the specified position of the starting point side of the data path; skipping to execute the step 5);
4) Deleting the original violating metal layer and setting a new metal winding rule; skipping to execute the step 5);
5) Judging whether the signal electromigration violation set is processed, if not, traversing and selecting the next current signal electromigration from the signal electromigration violation set, and skipping to execute the step 2); otherwise, skipping to execute the step 6);
6) Carrying out equivalence checking on the repaired signal electromigration report;
7) Rewinding, carrying out signal electromigration check, adding the signal electromigration information with the signal electromigration violation into the signal electromigration violation set if the detection is not passed, traversing and selecting one signal electromigration violation information from the signal electromigration violation set as the current signal electromigration, and skipping to execute the step 2); if the detection passes, the process is ended and exits.
2. The physical information based signal electromigration bulk repair method as set forth in claim 1, wherein the step of inserting a buffer unit in the middle position of the data path in step 3) comprises: and acquiring physical attributes of the violation path-related unit and the interconnection line, wherein the physical attributes comprise a name and a position, then determining the intermediate position of the data path according to the acquired unit and line positions, and then inserting buffer units with preset size, type and number into the intermediate position of the data path.
3. The physical information-based signal electromigration bulk repair method as set forth in claim 1, wherein the step of inserting a buffer unit at a designated position on the starting point side of the data path in step 3) comprises:
s1) judging the fan-out number of the data path, and if the fan-out number is equal to 2, skipping to execute the step S2); otherwise, if the fan-out number is larger than 2, skipping and executing the step S3);
s2) obtaining physical attributes of the violation path related unit and the interconnection line, wherein the physical attributes comprise names and positions, then determining the position of each fan-out point of the data path according to the obtained positions of the units and the lines, and inserting buffer units with preset sizes, types and numbers in front of each fan-out point; finishing;
s3) judging the distribution condition of the fan-out units of the data path, and if the fan-out units are distributed at one side of a fan-out point or more than three quarters of the fan-out units are distributed at one side of the fan-out point, skipping to execute the step S4); otherwise, skipping to execute the step S5);
s4) inserting buffer units with preset size, type and number into a common path or a driving unit of a fan-out point; finishing;
s5) grouping and inserting all fan-outs into buffer units with preset size, type and number; and (6) ending.
4. The physical information-based signal electromigration batch repair method as set forth in claim 3, wherein the detailed step of the step S4) includes: acquiring physical attributes of the violation path related unit and the interconnection line, wherein the physical attributes comprise a name, a position and a position of a common path bifurcation point, then determining a buffer unit insertion position according to the acquired position of the common path bifurcation point or the position of a starting point, and inserting buffer units with preset size, type and quantity into the buffer unit insertion position; and (6) ending.
5. The physical information-based signal electromigration batch repair method as set forth in claim 3, wherein the detailed step of the step S5) comprises: acquiring physical attributes of the violation path related units and the interconnection lines, wherein the physical attributes comprise names, positions and positions of common path bifurcation points, then judging the relative positions of each fan-out point and the common path bifurcation points, grouping all the fan-out points according to the relative positions of each fan-out point and the common path bifurcation points, and the grouping principle is that the relative positions of each fan-out point and the common path bifurcation points are relatively concentrated, determining the insertion positions of buffer units in each group of the fan-out points, and inserting the buffer units with preset sizes, types and numbers in the insertion positions of the buffer units; and (6) ending.
6. The physical information-based signal electromigration bulk repair method as set forth in claim 1, wherein the detailed step of the step 4) includes: firstly, obtaining the physical attributes of the line related to the violated route, wherein the physical attributes comprise a name, a position, a metal layer and a metal winding rule, deleting the metal layer which is violated only by signal electromigration, then creating a new metal winding rule according to the existing metal winding rule, setting only the line width and the space of the new metal winding rule, and changing the line width and the space of the metal layer according to the new metal winding rule by a tool in a winding way; jump execution step 5).
7. A signal electromigration batch repair system based on physical information comprises a computer device and is characterized in that: the computer device is programmed to perform the steps of the physical information based signal electromigration batch repair method as set forth in any one of claims 1 to 6.
8. A signal electromigration batch repair system based on physical information comprises a computer device and is characterized in that: the storage medium of the computer device has stored thereon a computer program programmed to execute the physical information based signal electromigration batch repair method according to any one of claims 1 to 6.
9. A computer-readable storage medium characterized by: the computer readable storage medium has stored thereon a computer program programmed to execute the physical information based signal electromigration batch repair method according to any one of claims 1 to 6.
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