JPH04180251A - Integrated circuit - Google Patents

Abstract

PURPOSE:To eliminate power lines on both sides of functional blocks by carrying out power connections for functional blocks internally using lines that are not connected with logic circuits within unit cells. CONSTITUTION:Power lines 3 between rows of unit cells 1 are interconnected through power lines 3 within wiring regions 5 between rows of unit cells. Interconnection holes 7 are formed in locations where the power lines 3 in unit cells 1 cross lines 6 that are not connected with unit cells. As a result, there are more unconnected lines on both sides of functional blocks 4 than central portions. These unconnected lines are used as substitutes of power lines. Therefore, there is no need for power lines on both sides of functional blocks, resulting in higher packing density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor integrated circuit. [Prior Art] FIG. 3 is a plan view showing the layout of functional blocks and signal wiring of a conventional semiconductor integrated circuit, and FIG. 4 is a plan view showing the layout of the functional blocks and power wiring shown in FIG. Figure 5 is a schematic circuit diagram of the basic cell shown in Figure 3. In Figure 1, fl+ is the basic cell, +21 is the signal wiring, (3) is the power supply wiring, (4) is the functional block, (5) is the wiring area,
(6) is “Wiring that is not electrically connected to the inside, U>
is the wiring connection point. In Figure 3, the basic cell (+1
A basic cell string is created by combining a plurality of basic cell strings, and one functional block (4) is constructed by arranging the basic cell strings in multiple stages. A wiring area (5) is provided between the basic cell columns, and the wiring area (5)
Signal wiring (2) for connecting between the basic cells (1) is provided inside. In FIG. 4, power supply wiring (3) is provided on the side surface of the functional block (4). In Figure 1115, from the upper and lower sides of the basic cell (1), the signal wiring (2) inside the basic cell (1) and the wiring [6] that is not electrically connected to the inside are connected to the outside of the basic cell H). The power supply wiring (3) inside the basic cell (++) can be drawn out from the left and right sides of the basic cell (+1) to the outside of the basic cell (+1. Next, the operation will be explained. Basic cell +11 is laid out so that the signal of the signal wiring (2) inside the basic cell (1) can be extracted from the upper and lower sides of the basic cell (1), and
Wires that are not electrically connected to the interior of the basic cell (1) can be passed through the basic cell (1) by using the empty space inside the basic cell (1).
The signal of 6) can be extracted from the upper and lower sides. Basic cell (1
) for power supply arrangement 3) to the basic cell (
When power wiring (31) is wired horizontally to the left and right of the basic cell (1) so that power can be supplied from the right and left sides of 1), and when a basic cell row is configured by combining multiple basic cells (1), , the power supply wiring (3) can be laid out in a straight line in the horizontal direction of the basic cell (1).This allows the power supply wiring (3) to be laid out in a straight line in the horizontal direction of the basic cell (1). Basic cell + 1) It is possible to arrange the basic cell 11) in the horizontal direction without considering the connection with a leapfrog. To supply power to the functional block (4) that combines the basic cells +1), power wiring (3) is wired vertically on the left and right sides of the functional block +41, and from there power wiring (3) is routed to each basic cell column. Distribute and supply power. The signal wiring (2) in the basic cell + 1), which is laid out so that signals can be taken out from the upper and lower sides of the basic cell (1), and the wiring (6) that is not electrically connected to the inside, are between the basic cell rows. The signal wiring (2) in the wiring area (5) provided in
) to connect the wiring between the basic cells fi1. [Problem to be solved by the invention] Since the conventional functional block is configured as described above, it is possible to eliminate unused wiring among the wiring provided in the basic cell that is not electrically connected to the inside. The problem was that there were a lot of them. This invention was made to solve the above-mentioned problems, and it is possible to effectively use wiring that is not electrically connected to the inside, and it is also possible to effectively use wiring that is not electrically connected to the inside. An object of the present invention is to obtain a semiconductor integrated circuit in which the power supply wiring provided on the left and right sides of a functional block can be removed by using the wiring as a power supply wiring. [Means for Solving the Problems] A semiconductor integrated circuit according to the present invention uses unused wiring that is not electrically connected to the inside of a basic cell as a power supply wiring, and also connects the left and right of a functional block. The power supply wiring that had been routed to the side of the unit was removed. [Operation] The semiconductor integrated circuit according to the present invention uses wiring that is not electrically connected to the inside of the basic cell as the power wiring, so that the power wiring that is wired on the left and right sides of the functional block can be removed. This makes it possible to reduce the size of the entire chip. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
1 is a plan view showing the layout of one functional block and power supply wiring, and FIG. 2 is a schematic circuit diagram of the basic cell shown in FIG. 1, showing (1) to (6) in FIG. (8) is the same as that shown in the conventional example shown in Figures 3 to 5.
Since it is 4th grade, the explanation will be omitted. (7) is a wiring connection hole. In FIG. 1, the power supply wiring (3) provided in the wiring area (5) between the basic cell columns is used to connect the power supply wiring (3) of each basic cell column in which basic cells (11) are combined. A wiring connection hole (7) is provided at the intersection of the power supply wiring (3) in the cell Tll and the wiring (6) which is not electrically connected to the inside of the basic cell (1), and the wiring is connected.Second In the figure, the signal wiring (2) inside the basic cell (1) and the wiring (6) that is not electrically connected to the inside can be drawn out to the outside of the basic cell (11) from the upper and lower sides of the basic cell (11). From the left and right sides of the basic cell (1), the basic cell (+1 internal power supply wiring (3) is connected to the basic cell (1)
can be pulled out to the outside. A wiring connection hole (7) is provided at the intersection of the power supply wiring (3) inside the basic cell (+1) and the wiring (5) that is not electrically connected to the inside of the basic cell (1). Next, the operation will be explained. In the functional block (4) created by combining multiple basic cells (1), the wiring area (
In the signal wiring (2) in 5), the wiring density of the wiring area (5) is large in the center and becomes smaller as it approaches the left and right side surfaces. Furthermore, a wiring (6) that is not electrically connected to the inside of the basic cell (+1) is provided in the basic cell Ill. Therefore, the basic cell (1) near the left and right sides of the functional block (4) is connected to the center Compared to the basic cell m in the basic cell m, the proportion of wiring +61 that is not connected to the inside of the basic cell (1) is increased. Therefore, the wiring (61) that is not electrically connected to the unused inside is ) to replace the power supply wiring (3) provided on the left and right sides of the functional block (4), the power supply wiring (3) provided on the left and right sides of the functional block (4) can be removed. Since the width of the power supply wiring (3) provided on both the left and right sides of the functional block (4), which allows for By using about 10 of each,
The power supply wiring (
The 0 function block (4), which can replace 3), is composed of hundreds to thousands of basic cells + 11.
In one basic cell (1), several to ten or more wiring lines (6) that are not electrically connected to the inside are laid out. It is possible to wire the power supply using unconnected wires (6). Also. Power wiring (3) and signal wiring (2) in the basic cell ill
) The wiring (6) that is not electrically connected to the inside that is not used is laid out using wiring with a different arrangement of 1 m, so a wiring connection hole (7) is provided in the insulating layer between different wiring layers. Connect wires in different wiring layers. [Effects of the Invention] As described above, according to the present invention, the power supply wiring that was provided on the left and right sides of the functional block is now configured with signal wiring and wiring that is not electrically connected to the inside. The existing power supply wiring can be removed, and the functional blocks can be configured without changing their size. Therefore, the chip size can be reduced and high integration becomes possible.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the layout of functional blocks and power supply wiring according to an embodiment of the semiconductor integrated circuit according to the present invention, FIG. 2 is a schematic circuit diagram of the basic cell shown in FIG. 1, and FIG. FIG. 4 is a plan view showing the layout of conventional functional blocks and signal wiring; FIG. 4 is a plan view showing the layout of the Tll function block and power wiring shown in FIG. 3; FIG. 5 is a schematic circuit of the basic cell shown in FIG. 3. It is a diagram. In the figure, (11 is a basic cell, (21 is a signal wiring, (
3) is the power supply wiring, (4) is the functional block, (5) is the wiring area, (6) is the wiring that is not electrically connected to the inside,
(7) is a wiring connection hole, and (8) is a wiring connection point. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a functional block consisting of a plurality of basic cells, signal wiring, and power wiring, and configured by combining the plurality of basic cells, the power wiring of the functional block is electrically connected to the internal logic circuit within the basic cell. A semiconductor integrated circuit characterized in that wiring is performed within the functional block using no wiring.