JPH032977A - Logic synthesizing device - Google Patents

Abstract

PURPOSE:To change an application rule file and to prepare a command file in accordance with the purpose of a designer by showing a list of rules that can be applied for each step and enabling the designer to add or delete the application rules for each step. CONSTITUTION:A synthesis flow chart is displayed via a flow chart display means 2, and a designer designates a step having the procedure to be changed via an input means 8. An application rule file changing means 4 displays the contents of an application rule file corresponding to the designated step and changes the rule file. When the changing operation is through, a command file production means 5 gathers the application rule files set at each step of a synthesis flow chart for preparation of a command file. Then a synthesis executing means 7 synthesizes a logical level description from a function level description based on the synthesis rule stored in a rule base 1. As a result, the logical level description can be automatically synthesized from the function level description in a procedure in accordance with the designing style of the designer.

Description

DETAILED DESCRIPTION OF THE INVENTION (Objective of the Invention) (Industrial Application Field) The present invention relates to a logic synthesis device that automatically synthesizes a logical level description from a functional level description using rules.

(Prior Art) In recent years, logic synthesis devices have been developed to support automatic membrane B1 of logic LSIs. What is this logic synthesizer?
Logic LSI RTL (register transfer level)
This is a system that automatically synthesizes logical level descriptions from functional level descriptions such as descriptions.

There are known logic synthesis devices that perform algorithmic synthesis and rules-based synthesis. When using the algorithm reduction method, the synthesis procedure is fixed to one, and there is no degree of freedom in the design ε1.
In rule-based illegality, it is possible to change the synthesis procedure by changing the rules.

However, it is generally said that the size of a logic LSI automatically synthesized by a logic synthesis device is larger than that of one synthesized by human means. Theoretically, it is possible to synthesize a logic LSI with the same layer weight by converting the layer weight method used by the designer into rules and incorporating it into a synthesis device, but in reality, the rules are This is because the application order is predetermined, making it difficult for designers to freely change the rules and adapt the synthesis procedure to suit their own design π1 style.

(Problems to be Solved by the Invention) As described above, in the conventional logic synthesis device, when synthesizing logic level descriptions based on rules, the order of application of rules is determined in advance, so the number of stages of the designer is The problem was that it was difficult to change it to suit the style.

This invention has been made in view of the problems of the prior art, and aims to provide a logic synthesis device that can automatically synthesize logic level descriptions according to the design style of the designer.
target

[Structure of the Invention] (Means for Solving the Problems) A logic synthesis device of the present invention includes a rule base that stores rules for synthesizing a logical level description from a functional level description, and a flow diagram that displays a synthesis flow diagram. a display means; an application rule file changing means for changing an application rule file that describes the order of rules to be applied in each step of the composite flow diagram displayed by the flow diagram display means; and each step of the composite flow diagram. The lower part of the command file generation section creates a command file that executes synthesis by putting together the applied Lulu files, and based on the command file created by the command file generation means, logic is generated from the functional level description according to the rules stored in the rule base. and a synthesis execution means for synthesizing level descriptions.

(Operation) In the logic synthesis apparatus of the present invention, first, a synthesis flow diagram is displayed by the flow diagram display means. Therefore, the installer 51 specifies the step for which the procedure is to be changed using a pointing device such as a mouse or manual means such as a keyboard.

The application rule file changing means displays the contents of the application rule file corresponding to the specified step, and deletes rules in a predetermined order by the entry horn means, or changes the application rule file by adding new rules. change.

When the modification operation of the applied rule files in all the steps to be changed is completed, the command file generation means collects the applied rule files in each step of the synthesis flow diagram and creates a command file.

Then, the synthesis execution means executes synthesis of the logical level description from the functional level description in accordance with the order specified by the command file based on the synthesis rules stored in the rule base.

In this way, a logical level description can be automatically synthesized from a functional level description using a procedure according to the designer's design style.

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

FIG. 1 shows an embodiment of the present invention, and the logic synthesis device of this embodiment displays a rule base 1 that stores synthesis rules from a functional level description to a logical level description, and a synthesis processing flow. an applied rule file 3 that describes the order of rules to be applied in each step of the synthesis flow, and an applied rule file change unit 4 for changing the contents of the applied rule file 3. There is.

In addition, a command file generation unit 5 that creates a command file for executing synthesis by collecting application rule files, a command file 6 generated by this command file generation unit 5, and following the instructions of this command file 6,
and a synthesis engine 7 that synthesizes functional level description input into logical level description based on the rules of the rule base.

Further, an input device 8 for inputting an application rule change procedure to the application rule file change section 4, a display device 9 for displaying flow diagram information from the flow diagram display section 2, and a function for the synthesis engine 7 are provided. A functional level description manual unit 10 for inputting level descriptions and a logical level description output unit 11 for outputting logical level descriptions synthesized by the synthesis engine 7 are provided as input/output means.

As shown in FIG. 2, the rule base 1 includes a rule file 12 that stores the main body of rules, a rule explanatory text file 13 that stores rule explanatory text that explains the function of each rule, and rules that can be used in each step. The application rule list file 14 stores a list of applicable rules.

Next, the operation of the logic synthesis device having the above configuration will be explained.

First, the flow display section 2 displays a composite flow diagram as shown in FIG. 3 on the display device 9, and at the same time displays an explanation of the processing functions at each step.

Here, when the designator uses the manual device 8 to specify the step 11' for which he/she wishes to change the procedure, the application rule file changing unit 4 creates the application rule corresponding to the specified step, as shown in FIG. The contents of the file 3 are displayed on the display device 9, and at the same time all the rules that can be used in that step are selected from the applied rule list file 14 and the rule list is displayed.

In the display state of FIG. 4, if you want to delete a certain rule using the manual device 8, specify the rule name,
Manually issue deletion commands. If you want to add a rule, specify the name of the rule you want to add from the list of applicable rules and manually issue an addition command.

The applicable rule file changing unit 4 further uses the manual device 8 to issue an instruction to display an explanatory text for a rule to be used or to be deleted from the list of applicable rules in the display shown in FIG. 4, and the display shown in FIG. Regarding the specified rule, rule E in this embodiment, an explanatory text explaining what kind of processing operation is to be executed under the rule is displayed on the display device 9.

Therefore, the designer can change the applicable rules while checking the function of each rule.

When the application rule file modification operation for all steps to be modified is completed in this way, the command file generation unit 5 creates a command file 6 for execution of synthesis.

The synthesis engine 7 reads the command file 6, calls the rules specified by the command file 6 from the rule file 12 stored in the rule base 1, and synthesizes the function level description given by the functional level description human resource section 10. The processing is executed, the processing for each step of the application rule file is executed sequentially, and the logical level description is output from the output unit 11.

The processing functions of each step of this logic synthesis process will be explained in more detail using an example in FIG. Based on this, circuits of abstract components such as selectors, ADDERs, and ALUs are generated.

Subsequently, in step S3, an actual logic gate circuit is generated from the abstract component circuit based on the rules of rule base 1.

Next, in step S4, if the logic gate circuit generated in step s3 based on the rules of rule base 1 has any redundant parts that can be simplified, simplification processing is performed thereon.

In the next step S5, cells registered in the library are assigned to the obtained logic gate circuit based on the rules, and the automatic membrane 51 of the logic LSI is completed with the output of the logic level description in step s6.

Note that the present invention is not limited to the above-described embodiments, and it is also possible to synthesize logic level descriptions in even smaller steps.

[Effects of the Invention] As described above, according to the present invention, in order to synthesize a logical level description from a functional level description, the synthesis execution stage is divided into several steps and rules can be applied to each step. A list is shown and the designer can modify the application rule file by adding or deleting application rules for each step, making it possible to create command files that match the designer's intentions. , it is possible to synthesize logical level descriptions that match the designer's style.

[Brief explanation of the drawing]

Fig. 1 is a circuit block diagram of an embodiment of the present invention, Fig. 2 is a structural diagram showing the rule base configuration of the above embodiment, and Fig. 3 is an explanation showing an example of a synthesis flow diagram in the above embodiment. 4 is an explanatory diagram showing a display example of the application rule file of -step in the above embodiment, FIG.
The figure is a flowchart I explaining the procedure for synthesizing logical level descriptions. 1... Rule base 2... Flow diagram display section 3
...Applicable rule file 4...Applicable rule file changing section 5...Command file generating section 6...Command file 7...Composition engine 8.
...Human power device 9...Display device 10...Functional level description Human power section 11...Logic level description output section C (embedded J: 'J':! l Hidekazu Miyoshi

Claims (1)

[Scope of Claims] A rule base storing rules for synthesizing a logical level description from a functional level description, a flow diagram display means for displaying a synthesis flow diagram, and a synthesis flow diagram displayed by the flow diagram display means. An application rule file changing means for changing an application rule file that describes the order of rules to be applied at each step, and a command file for executing synthesis by putting together the application rule files at each step of the synthesis flow diagram. and a synthesis execution means for synthesizing a logical level description from a functional level description according to the rules stored in the rule base based on the command file created by the command file generating means. Device.