JPH118306A - Macro cell - Google Patents

Abstract

(57) [Summary] In a conventional macro cell layout design, a ring power supply must be designed after core design is completed, and furthermore, a connection with the core must be designed. And the design period of the macro cell becomes longer. A wiring which is to be a ring power supply for a macro cell is provided in a basic cell, and the basic cell has a shape in which a ring power supply is connected after repeatedly arranging an array, and peripheral circuits and cores other than the arrayed basic cells are connected. Wiring to be a ring power supply is provided in a nacell, and after the basic cells are repeatedly arranged in an array, a peripheral circuit and a corner cell are arranged in the macro cell, and the ring power of the macro cell is connected. [Effect] Since the annular power supply of the macro cell is connected only by repeatedly arranging the basic cell, the peripheral circuit, and the corner cell, it is not necessary to design the annular power supply every time the macro cell is designed. Can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor integrated circuit device having a macro cell in one chip, and more particularly to a macro cell having a ring power supply.

[0002]

2. Description of the Related Art FIG.
Shown in Reference numeral 11 denotes a ring-shaped power supply, and a pair of a voltage power supply and a ground power supply is prepared. Reference numeral 13 denotes a macrocell core. 1
Reference numeral 2 denotes a power supply connection from the annular power supply 11 to the macrocell core 13.

The procedure for designing a macro cell will be described below. In the conventional macro cell design, first, a layout design of a part of the core 13 designed to be highly integrated using a basic cell in order to realize a function is performed for each required specification, and a core satisfying the required specification is performed. After the design is completed, a ring power supply 11 is prepared each time separately from the core while considering the layout rule so as to match the core, and finally, a power supply connection for supplying power to the core and the ring power supply without electrical contradiction. 12
Was designed each time.

[0004]

However, in the conventional macrocell described above, the layout design of the annular power supply of the macrocell is performed after the core design is completed, taking into account the layout rules of the annular power supply and the core. Furthermore, the connection between the annular power supply and the core has to be designed in consideration of electrical inconsistency.

As a result, each time a macrocell is designed, the annular power supply must be redesigned. The specifications of the macro cell using the basic cell are various and there is a drawback that the design period of the macro cell becomes long although the design must be completed in a short period.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above-mentioned problems, and in order to realize a specific function, a basic device having the same function and almost the same size is used. In a macrocell having an annular power supply in which cells are repeatedly arranged in an array and circularly connected to supply an annular power supply, a wiring to be an annular power supply for the macrocell should be provided in the basic cell to be an annular power supply. According to the number of basic cells in which the wirings are arranged in an array, the basic cells have a shape in which a circular power supply is connected after the array is repeatedly arranged, and are arranged in peripheral circuits and corners other than the arrayed basic cells. Wiring to be a ring power supply is provided in a corner cell, and after basic cells are repeatedly arranged in an array, peripheral circuits and corner cells are arranged in the macro cell to form a ring power supply for the macro cell. There has been made are wired.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a layout diagram showing an embodiment of the present invention. Reference numerals 40-1, 40-2, 40-3, and 40-4 denote basic cells for realizing the function of the repetition specification.
1, 20-2, 20-3 and 20-4 are corner cells, 5
0-1 are peripheral circuit cells. Here, a hatched portion indicates a ring-shaped power supply region, which includes a voltage power supply and a ground power supply.

The unit of each repetitive basic cell is a region surrounded by a dotted line, and a voltage power supply and a ground power supply are previously arranged in a hatched annular power supply area in the basic cell. In this case, the connection is made without inconsistency in electrical and layout rules. In the repeating cell 40-1, the peripheral circuit 50-1 is arranged and connected between the basic cell and the annular power supply region in a configuration in which the wiring area of the peripheral circuit cell 50-1 is taken into consideration.

The corner cells are connected to an annular power supply region composed of a voltage power supply and a ground power supply, an annular power supply, an internal core composed of a repetitive basic cell and a peripheral circuit cell, without any inconsistency in terms of electrical and layout rules. In this configuration, it is connected to the annular power supply arranged repeatedly in an array without any inconsistency in electrical and layout.

With the above-described cell configuration, electrical and layout rules can be obtained only by arranging basic cells repeatedly as an internal core, arranging peripheral circuit cells, and arranging corner cells at four corners. Configuration that does not contradict each other.

In this embodiment, the annular power supply region is provided only on one side, but it is of course possible to provide a ring power supply on both sides depending on the repeated basic cells.

[0012]

As described above, according to the present invention, the wiring to be the annular power supply of the macro cell is provided in the basic cell, and the number of the basic cells corresponding to the number of the basic cells in which the wiring to be the annular power supply is arranged in an array is provided. Is repeatedly connected to the ring power supply after the array arrangement, and the peripheral circuits other than the basic cells arranged in the array and the corner cells arranged in the corners are provided with wiring to be the ring power supply. After the basic cells are repeatedly arranged in the array, the peripheral circuit and the corner cells are arranged in the macro cell, and the annular power supply of the macro cell is connected. Therefore, each time the macro cell is designed, the layout design of the annular power supply is particularly required. Instead, the annular power supply is formed only by arranging the cores of the macrocells, and the layout design period can be shortened.

[Brief description of the drawings]

FIG. 1 is a layout diagram showing an embodiment of the present invention.

FIG. 2 is a layout diagram showing a conventional technique.

[Explanation of symbols]

11, 30: annular power supply area 12: annular power supply and internal core connection power supply area 13: internal core 20-1, 20-2, 20-3, 20-4 ... corner cell 40-1, 40-2, 40-3, 40-4 ... repeated basic cells 50-1 ... peripheral circuit cells

Claims (3)

[Claims] To realize a specific function, a basic cell having the same function and substantially the same size is repeatedly arranged in an array and connected in a ring to supply a ring power. In a macro cell having a power supply, wiring to be a ring power supply of the macro cell is provided in the basic cell, and the basic cells are repeatedly arranged in accordance with the number of basic cells in which the wiring to be a ring power supply is arranged in an array. Wiring to be a circular power supply is provided in peripheral circuits other than the basic cells arranged in the array and in corner cells disposed in the corners, wherein the wiring is formed by connecting a circular power supply after the array arrangement. Wherein the peripheral circuit and the corner cell are arranged in the macro cell after the array is repeatedly arranged, and a ring-shaped power supply of the macro cell is connected. 2. A macro cell, wherein the basic cells according to claim 1 have a structure arranged in an array in the row direction, and a ring power supply in the basic cell is connected in the row direction. 3. A macro cell, wherein the basic cells according to claim 1 have a structure arranged in an array in a column direction, and a ring-shaped power supply in the basic cell is connected in a column direction.