JPH02306659A - Semiconductor device - Google Patents

Abstract

PURPOSE:To increase the degree of freedoms of wiring a data bus and disposing a cell and to perform an optimum layout by providing data bus input/output terminals on two opposed sides of a computer function cell and a macro functional cell. CONSTITUTION:In a standard cell type integrated circuit, input/output terminals 14-29 of data bus 10 of a computer functional cell 3 and macro functional cells 4-8, 12 are disposed at a predetermined internal from cell reference coordinates 13 on one sides of the outer peripheries of the cells and also symmetrically disposed on the opposed sides. That is, since the terminals 14-29 of the cells 3 and 4-8 are disposed on the opposed two sides, the cells 4-8 are disposed at both sides with the bus 10 as a center, and the macro functional cell having a small height is vertically connected with the data bus. Thus, it is not necessary to bend the data bus wirings complicatedly to optimally dispose and wire them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the arrangement of data bus terminals of computer function cells and macro function cells in standard cellular integrated circuits.

[Conventional technology 1] The data bus terminals of computer function cells and macro function cells of conventional standard cell type integrated circuits are located on one side of the outer periphery of the cell, or all terminals are targeted even if there are data bus terminals on the opposite side. was not placed.

[Problems to be Solved by the Invention] However, in the prior art described above, the layout efficiency of the arrangement of computer function cells and macro function cells was greatly affected by the arrangement of data buses within the integrated circuit chip.

In other words, a data bus is arranged in a straight line in the center of the integrated circuit chip, and computer function cells and macros (
Ikuno cells were placed.

For this reason, when the number of macro function cells increases, the data bus must be arranged in a U-shape, which increases the data bus wiring area within the integrated circuit chip and limits the freedom of layout. had. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a computer function cell and a macro function cell that enable efficient integrated circuit chip layout.

[Means to solve the problem]

The semiconductor device of the present invention includes: a) a standard cell type integrated circuit; b) comprising a basic gate cell, a computer function cell, and a macro function cell whose input/output signals are a computer function cell and a data bus of the computer function cell; C) The input/output terminals of the data buses of the computer function cell and the macro function cell are arranged on one side of the outer periphery of the cell at regular intervals from the cell reference coordinates, and are also arranged symmetrically on the opposite sides.

[Example] An embodiment of the present invention will be described below.

FIG. 1 is a plan view of a standard cell type integrated circuit chip. 6 l is an integrated circuit chip, 2 is a pad area, 3 is a computer function cell, 4 to 8 are □ macro function cells, 9 is a basic gate cell area, 10 .11 is a data bus. Second
The figure is an enlarged view of the macro functional cell in FIG. 1.

12 is a macro function cell, 13 is a cell reference coordinate point, 14-
29 is a data bus input/output terminal.

The data bus input/output terminals are 14, 22, 15, and 23, and similarly, the same signal terminal is used between the upper and lower sides of the macro functional cell up to 21 and 29. As shown in 4.6, a vertical data bus can be constructed using the input/output terminals on the upper and lower sides of the macro function cell. By providing the data bus input/output terminals on two opposing sides of the computer function cell and the macro function cell, the degree of freedom in the arrangement of the data bus wiring and cells increases and an optimal layout can be achieved.

[Effects of the Invention] As described above, according to the present invention, since the data bus terminals of the computer function cell and the macro function cell exist on two opposing sides, the macro function cell can be arranged on both sides with the data bus at the center. , macro function cells with small cell heights can easily connect data buses in the vertical direction, eliminating the need for complicated bending of data bus wiring (this allows for effective use of wiring area and allows for optimal placement and wiring. Become.

[Brief explanation of drawings]

FIG. 1 is a plan view of a standard cellular integrated circuit chip. FIG. 2 is an enlarged view of the macro functional cell. 1...Integrated circuit chip 2...Pad area 3...Computer function cells 4-8...Macro function cell 9...Basic gate cell area 10 .11...Data bus 12...Macro function cell 13...Cell reference coordinate points 14-29...Data bus input/output terminal 11 cells 821 quantity in advance

Claims (1)

[Scope of Claims] a) A standard cell type integrated circuit, b) The constituent cells include a basic gate cell, a computer function cell, and a macro function cell whose input/output signals are a data bus of the computer function cell. A semiconductor device characterized in that input/output terminals of data buses of a computer function cell and a macro function cell are arranged on one side of the outer periphery of the cell at regular intervals from the cell reference coordinates, and are also arranged symmetrically on opposite sides.