JPS61127227A - Logical module - Google Patents

Abstract

PURPOSE:To eliminate the need for a prototype package at the LSI circuit design by setting separately the logical function depending on the connection description and the operation description. CONSTITUTION:A control circuit 106 extracts an input state value and a pointer to an operation description memory 105 from a connection description memory 104. An operation circuit 107 reads the operation description of the pointer of the operation description memory 105, applies operation based on the operation description to the said input state value from the control circuit 106, and the control circuit 106 transmits the output state value to the connection description memory 104 or an external terminal 101 and then one operation is finished. The control circuit 106 delivers the state value according to the pointer to the next connection description. Similarly, the logical function is operated based on the connection description memory 104 and the operation description memory 105 sequentially so as to operate the circuit as the designed logical circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the design and prototyping of LSIs used in information processing devices and the like, and particularly to a prototyping logic module for logic checking.

Conventional technology Conventionally, LSI logic circuits used in information processing equipment, etc.
When using this device for verification, debugging, etc. before the design is completed, this 18I logic circuit is created in a pseudo manner on a package using existing 88I and other electronic components. was.

Therefore, there is a drawback that parts and man-hours are required to create a prototype package every time a design is made.

Problems to be Solved by the Invention An object of the present invention is to provide a logic module that solves the above-mentioned drawback, that is, the need to create a prototype package when designing an LSI circuit.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an external terminal and
A connection description memory that loads a connection description of a logic circuit, a behavioral description memory that also loads a behavioral description of a logic circuit, a control circuit connected to the connection description memory, and a control circuit connected to the control circuit and the behavioral description memory. The present invention employs a configuration consisting of an arithmetic circuit that determines the direction of signal transmission between the control circuit and the external terminal, and an input/output switching circuit that determines the direction of signal transmission between the control circuit and the external terminal.

Operation Since the present invention is configured as described above, the control circuit takes out the input state value and the pointer to the behavioral description memory from the connection description memory, and the arithmetic circuit reads the behavioral description of the pointer in the behavioral description memory.

Next, an arithmetic operation based on the behavioral description is performed on the above-mentioned input state value from the control circuit, and the control circuit transmits this output state value to the connection description memory or external terminal to complete one operation. The control circuit propagates the state value according to the pointer to the next connection description. Thereafter, in the same manner, the logic functions are sequentially operated based on the connection description memory and the behavior description memory, so that it can operate as a designed logic circuit.

Example Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, which shows a block diagram of an embodiment of the present invention, the logic module of the present invention includes an external terminal 101, an input/output switching circuit 103, a connection description memory 104, and an operation description memo! 7105, control circuit 106, and arithmetic circuit 1
07.

The input/output switching circuit 103 connects the external terminal 101 and the control circuit 10
This circuit determines the direction of signal transmission between the external terminals 101 and 6, and thereby determines whether each of the plurality of external terminals 101 is used for input or output.

The connection description memory 104 is loaded with a connection description consisting of the connection structure and state values of the target model, a pointer to the behavior description memo IJ 105, and the like. An example of the description for one game in the connection description memory 104 is shown in characters in Table 1.

The behavioral description memory 105 is loaded with a behavioral description expressing in intermediate language format the arithmetic operation when determining the output state value from the input state value of each gate. An example of the description for one game in the behavioral description memory 105 is shown in characters in Table 2.

The contents of each item in Table 1 are entered in the bina v @ o #, @ 1”.

Table 2 The actual content is encoded.

Next, the operation of the logic module will be described with reference to FIG. 1, Table 1, and Table 2.

First, the connections and operations for each gate of the target designed logic circuit are stored one word at a time at each address as shown in Tables 1 and 2. This loading method is the same as normal loading into memory, and is omitted in this embodiment.

Next, after setting the connection from the external terminal 101 using the input/output switching circuit 103 to match the designed logic circuit,
The control circuit 106 is controlled by the input signal from the external terminal 101.
controls the operation of each function. Referring to Table 1, the control circuit 106 reads from the connection description memory 104 the input side of Table 1.

The second input state value and the pointer to the mouth behavior description are extracted and sent to the arithmetic circuit 107. The arithmetic circuit 107 accesses the behavioral description memory 105 based on the pointer to the behavioral description, reads out the behavioral description, and then performs the operations shown in Table 2 for the input state values 2 and 3 passed from the control circuit 106. Based on the behavioral description, the operations E and then perform the arithmetic operation G, and the resulting output state value Q is passed to the control circuit 106. The control circuit 106 connects the output state value Q to the connection description memory 10.
At the same time, the pointer to the next connection description of output side A is taken out and the output state value is propagated.

Thereafter, calculation operations are performed one after another in the same manner. When the external terminal 101 is specified for the propagation light of the output state value by the pin number of the output side A, the state value is output from the external terminal 101 via the input/output switching circuit 103.

Further, a detailed explanation will be given with reference to FIG. 2 showing a part of one example of a specific circuit. In FIG. 2, the logic circuit includes AND gates, NAND gates, O-gates, etc.

Focusing on AND gate 1 in the connection description memory, the input state values X(5) and Y(6) connected to this input are:
It is calculated by AND7 in the behavioral description memory, and its output state value is propagated to the output side 8. This output state value is then propagated to the input 23 of the NAND gate 2;
A NAND operation is performed between the input state values of and 24 and is propagated to the output of the NAND gate 2 in the connection description memory. Also, the output state value 8 is the input side 31 of the Of'L gate 3.
It is also propagated to In this way, all operations of the logic circuit are performed by the description of the logic module. In addition, in FIG. 2, the description for one game in Table 2 shown above is shown in one line.

Therefore, when this logic module is viewed from the external terminal 101, the logic function of this logic module is determined by the settings of the input/output switching circuit 103 and the storage contents of the connection description memory 104 and the behavior description memory 105.

That is, the connection description memory 104 and the behavior description memory 10
Since an arbitrary circuit configuration can be obtained by setting 5, there is an advantage that various logical functions can be realized.

Effects of the Invention As explained above, according to the present invention, by allowing logical functions to be set separately using connection descriptions and behavioral descriptions, it is possible to realize a logic module capable of performing various operations. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a specific example showing the relationship between an example of a part of a logic circuit, a connection description memory, and a behavior description memory. 101... External terminal, 103... Input/output switching circuit, 104°°°゛°・Connection description memo'J, 1
05... Behavior description memory, 106...
Control circuit, 107... Arithmetic circuit. Figure 7

Claims (1)

[Claims] an external terminal, a connection description memory, a behavior description memory, a control circuit connected to the connection description memory and determining an operation order based on information in the connection description memory, and a control circuit connected to the control circuit and the behavior description memory, the an arithmetic circuit that executes an operational state based on information in a behavioral description memory;
A logic module comprising an input/output switching circuit that determines the direction of signal transmission between the control circuit and the external terminal, and performing logical operations according to the connection description memory and the behavior description memory.