KR20030072871A - Method for automatically creating user-defined cell file - Google Patents

Abstract

PURPOSE: A method for automatically generating a UDC(User-Defined Cell) file is provided to shorten time for generating the UDC file, and to enhance the user convenience as compared with the method for generating the UDC file from a synopsis report file. CONSTITUTION: A synopsis(100) is generated from a post verilog netlist(100) completing a layout, an SDF(Standard Directory Format) file and a DC file(101) made from a cubic with an SPF file, and a Cshell script(102) as an input/output condition for expressing a characteristic. A data processing program(120) using the Cshell and the Awk automatically describes the timing data for an UDC field from the synopsis. Thus, the UDC file(130) is automatically generated.

Description

How to automatically create custom cell files {METHOD FOR AUTOMATICALLY CREATING USER-DEFINED CELL FILE}

The present invention relates to a method for generating a user-defined cell (hereinafter referred to as UDC) file.

1 is a diagram sequentially illustrating a general method of generating a UDC file.

Referring to FIG. 1, a post verilog netlist file (ie, a file with extension v) 10 having completed layout, an SDF file made in cubic with an SPF file, and a DC A synopsys 40 is generated from the file 20 and a Cshell script 30 that is an input / output condition for displaying the characteristics.

Here, verilog is a hardware description language (HDL) used to design electronic systems at component, board, and system level. Developed by Phil Morby, it was initially developed as a simulation language for use in describing stimuli. By the end of the 1980s, Barilolog was proprietary to HDL, but later became an IEEE standard.

The user calculates timing values to be manually written to the UDC file from the timing information described in the synopsis 40 (50). The UDC file 60 is generated by writing the calculated timing values in the UDC file.

However, in the related art, there is inconvenience in that a user directly calculates timing values to be recorded in the UDC file 60.

Accordingly, an object of the present invention is to solve the above object, and to provide a method for automatically generating a UDC file.

1 is a view sequentially showing a general method of generating a UDC file;

2 is a diagram showing a UDC file generation procedure according to a preferred embodiment of the present invention;

3 is a diagram illustrating a process of describing timing data in a UDC field in the data processing program shown in FIG. 2;

4 illustrates a process of describing a timing value in a UDC field;

5 shows an example of a synopsis report file;

6 shows an example of a setup program for describing a timing value in a UDC field;

FIG. 7 is a flowchart showing the setup program shown in FIG. 6; FIG.

8 illustrates an example of a UDC file format;

9 shows another example of a synopsis report file;

10 shows an example of an output delay time calculation program for describing a timing value in a UDC field;

11 is a flowchart showing the program shown in FIG. 6;

12 is a hidden file generated while executing the program shown in FIG. 10; And

13 is a diagram illustrating another example of a UDC file format.

(Configuration)

According to an aspect of the present invention for achieving the above object, a method for generating a user-defined cell file comprises: from a layout of a post-barrel log netlist file, a standard directory format file, and a Cshell script Generating a synopsis, generating a STA report file from the synopsis, calculating a derating value and describing a timing value in a user defined cell file.

In a preferred embodiment, the calculating of the derating value may include reading out optimal voltages, worst voltages and representative voltages at each of the plurality of temperatures from the STA report file, Dividing each of the read voltages by a predetermined value and obtaining the largest value of the worst condition and the smallest value of the optimal condition from each of the results of the division.

In a preferred embodiment, the step of describing a timing value in the user-defined cell file may include referencing a pin name in the user-defined cell format, and setting the timing value in the best and worst report file of the referenced pin name. Dividing by a derating value and describing the divided value in a timing table of a UDC file format.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 to 13.

2 is a diagram illustrating a UDC file generation procedure according to a preferred embodiment of the present invention. Referring to FIG. 2, a post verilog netlist file (ie, a file with an extension v) 100 having completed layout, an SDF file made in cubic with an SPF file, and a DC Synopsys 110 is generated from file 101 and Cshell script 102 which is an input / output condition for displaying properties. The data processing program 120 using Cshell and Awk automatically describes timing data in the UDC field from the synopsis. Accordingly, UCD file 130 is automatically generated.

FIG. 3 is a diagram illustrating a process of describing timing data in a UDC field in the data processing program 120 shown in FIG. 2. Referring to FIG. 3, the data processing program 120 first generates a static timing anaylisis (STA) report file 121 and calculates a derating value (122). The specific process of calculating the derating value is as follows. First, a representative value is extracted from the report file 121. Then, seven voltages necessary for calculating the derating value are read out from the report file 121. The seven voltages needed to calculate the derating values are:

1. Worst voltage at 25 ℃

2. 25 ℃ best voltage

3. -40 ℃ typical voltage

4. 0 ℃ representative voltage

5. 70 ℃ representative voltage

6. 85 ℃ representative voltage

7. 125 ℃ representative voltage

Each of these voltages is divided by a representative value. In the divided value, the largest value of the worst condition and the smallest value of the optimal condition of each pin is used as the derating value.

The obtained timing values and the timing values from the UDC file format 123 are described in the UDC field (124). The process of describing the timing value in the UDC field is shown in detail in FIG.

Referring to FIG. 4, first, a pin name is referenced in the UDC file format 123 (124a). The timing value is divided by the best / worst derating value in the best / worst report file of the referenced pin name (124b). The divided values are described in a timing table of the UDC file format.

5 to 8 are diagrams exemplarily illustrating a process of calculating a setup time and recording a UDC file. 5 illustrates an example of the synopsis report file 121, and FIG. 6 is a diagram illustrating an example of a setup program for describing timing values in a UDC field, and FIG. 7 is a diagram of the setup program illustrated in FIG. 8 is a flowchart illustrating an example of the UDC file format 123.

Data arriaval time 1.07500, clock network delay 0.12709 and library setup time -0.11755 described in the synopsis report file shown in FIG. 5 are respectively shown in step 206 shown in FIG. Are inputted as 'tdly', 'skew' in step 209 and 'lib_setup' in step 212, respectively. The calculation result 'tSU.1' of step 213 which is the last step of the flowchart shown in FIG.

By the method described above, the UDC file 125 is automatically generated without user's work.

9 to 13 are views illustrating a process of calculating an output delay time and writing the same to a UDC file. FIG. 9 illustrates another example of the synopsis report file 121. FIG. 10 is a diagram illustrating an example of an output delay time calculation program for describing a timing value in a UDC field, and FIG. 11 is illustrated in FIG. 6. A program is shown in a flowchart. FIG. 12 is a hidden file created while executing the program shown in FIG. 10 and FIG. 13 is a diagram showing another example of the UDC file format 123.

The values OXOUTP [2], out and r described in the synopsis report file shown in FIG. 9 are input as pin, out and r values of the flowchart shown in FIG. The calculation result of the flowchart shown in FIG. 11 is input to 'template_teaklite.tR' of the hidden file shown in FIG. The result of the following equation shown in FIG. 12 is input as value ('tR.X.1') shown in FIG.

nawk 'BEGIN {s = ""}; {s = sprintf ("% s,% .5f", s, $);

END {sub ("^,", "", s); print s} '

While the invention has been described using exemplary preferred embodiments, it will be understood that the scope of the invention is not limited to the disclosed embodiments. Accordingly, the claims should be construed as broadly as possible to cover all such modifications and similar constructions.

According to the present invention as described above, the UDC file is automatically generated by the program. Therefore, compared with the conventional user generating the UDC file from the synopsis report file, the UDC file generation time is shortened and the user's convenience is increased.

Claims (3)

Here's how to create a user-defined cell file: Generating synopsis from the layout-completed post barrel log list file, standard directory format file, and Cshell script; Generating a STA report file from the synopsis; Calculating a derating value; And A method for generating a user-defined cell file comprising the step of describing a timing value in a user-defined cell file. The method of claim 1, Calculating the derating value, Reading an optimal voltage, a worst voltage and representative voltages at each of the plurality of temperatures from the STA report file; Dividing each of the read voltages by a predetermined value; And And obtaining the largest value of the worst condition and the smallest value of the optimal condition of each pin from the results of the division. The method of claim 1, Describing a timing value in the user defined cell file, Referencing a pin name in the user defined cell format; Dividing the timing value by the best and worst drating values in the best and worst report files of the referenced pin names; And And describing the divided value in a timing table of a UDC file format.