JPS60105252A - Function selective integrated circuit - Google Patents

Abstract

PURPOSE:To enable to select any desired function block by controlling the external connection terminal portion of a plurality of function blocks through the switch portion formed on the one and same integrated circuit chip. CONSTITUTION:When ''1'' is added to a control terminal 1 and ''0'' to the other control terminals, ''1'' is added to each of the input-side terminals of AND gate circuit 22, 25, 28, 32, 35 and 38. If ''1'' is inputted through the terminals 11, 13 and 15, ''1'' is inputted to all of the other input-side terminals of the AND gate circuits 30-38, while only the AND gate circuits 32, 35 and 38 become ''ON'' and ''1'' added to the terminal 11, 13 and 15 is inputted to a function block 6. Meanwhile, an output signal from the function block 6 is applied from terminals 61-63 to the input-side terminals of the AND gate circuits 22, 25 and 28. Since ''1'' has been added to the other input-side terminals from the control terminal 1, only the output signals of the terminals 61-63 are outputted from the terminal 14, so that this large scale integrated circuit 7 operates as the function block 6.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a function selection type integrated circuit, and more particularly to a function selection type integrated circuit used in a gate array type integrated circuit.

(b) Prior art and problems At present, semi-custom gate array integrated circuits are progressing in the direction of larger scale, so many electronic devices,
Most or most of the main parts of communication equipment are now composed of one or two large-scale integrated circuits.

However, many of the peripheral parts of the above-mentioned main parts are small-scale, multi-product, and cannot be mass-produced; in other words, they are difficult to fabricate into large-scale integrated circuits.

As a result, it is difficult to downsize the device, and the number of manufacturing steps increases.
There were problems such as high prices.

(C) Purpose of the Invention The present invention has been made to solve the problems of the prior art described above, and provides a function selection type integrated circuit for promoting the large-scale integration of circuits that are difficult to integrate into large-scale circuits. is intended to provide.

(d) Structure of the Invention The object of the above invention is to connect the external connection terminal portions of a plurality of functional blocks formed on one integrated circuit chip to the integrated circuit via a switch portion formed on the same integrated circuit chip. A function selection type characterized in that an arbitrary functional block among the plurality of functional blocks can be selected by connecting to an external connection terminal section of a package containing a chip and controlling the switch section from the outside. This is accomplished by providing an integrated circuit.

(el　Embodiments of the invention FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, 1 to 3 are control terminals, 4 to 6 are machine blocks, 7 is a large scale integrated circuit, 10 to 15 are terminals of the large scale integrated circuit 7, 20 to 28 and 30 to 38 41 to 48.5], -58 and 61 to 68 indicate terminals of the functional blocks, respectively.

Each of these elements is connected as follows.

That is, the control terminal 1 is connected to the AND gate circuits 22, 25, 28
and 32.35.38, control terminal 2 is AND gate circuit 21.24.27 and 3L34.37, and control terminal 3
are AND gate circuits 20, 23, 26 and 30, 33 .
36, respectively.

Also, the terminals 4L42 and 43 are connected to the Antogame 1-circuits 20 and 2.
3.26 to the terminal 10, the terminals 51, 52.53 to the AND gate circuit 21, 24.27 to the terminal 12, and the terminal 6L62.63 to the AND circuit 22, 25, 213.
Terminal 14 through and terminal 45° 46.47 connects to terminal LL 13.1 through AND gate circuit 30, 33.36.
5, and terminals 55, 56, 57 . BAND gate circuit 31
．． 34.37 to terminal LL13.15 and terminal 65
, 66.67 are connected to terminals 11, 13, and 15 via AND circuits 32, 35, and 38, respectively.

The function selection type large-scale integrated circuit connected in this manner operates as follows.

That is, for example, "1" is set at control terminal 1, and "1" is set at other control terminals.
o ” is added, 7nd game 1 - circuit 22.25
．． 2B, and & on each input side of 32, 35.38
:: 1″ is added to 1 child.

Therefore, if "1" is input from terminals 11, 13 and 15, 1" is input to all other terminals on the input side of AND gate circuits 30 to 38, but 1" is input from control terminal 1. Only the AND gate circuits 32+35 and 38 are turned on, and the 1 applied to terminals 11, 13 and 15
” is input to function block 6.

On the other hand, the output signal from the functional block 6 is output from terminals 61 to 63.
and is applied to the input side terminals of AND gate circuits 22, 25 and 28. As mentioned above, '1' from control terminal 1 is added to another terminal on the input side of this AND gate circuit, so only the output signals from terminals 61 to 63 are sent to terminal 1.
4, this large-scale integrated circuit 7 is outputted from the functional block 6.
operates as

Similarly, when "1" is input to the control terminal 2, the function block 5 is set, and when "1" is input to the control terminal 3, the large-scale integrated circuit 7 is set as the function block 4, but this is limited to three. Needless to say, it is not a thing.

Also, I used an AND gate circuit as a switch circuit, but
This is also not limited to an AND gate circuit, and in principle any switch circuit may be used.

Furthermore, although functional blocks 4, 5, and 6 are mutually independent blocks in FIG. 1, they do not necessarily have to be independent; some functions may be exchanged between some or all blocks. It goes without saying that things can be made common.

(fl As described in detail, according to the present invention, a plurality of functional blocks are formed on one integrated circuit chip, and between the external connection terminal of each functional block and the external connection terminal of the integrated circuit package. is connected via a switch circuit that can be turned on or off under external control.

So, after this integrated circuit was completed, we controlled this switch circuit so that only one of the multiple functional blocks could be connected to the external connection terminal of the integrated circuit package. Although it is designed and molded as a single integrated circuit using an integrated circuit chip, when it is used, it becomes equivalent to multiple types of integrated circuits.

Therefore, even if a large number of relatively small-scale circuits are mounted on a relatively large-scale semi-custom game array integrated circuit chip, it can be done with a relatively small and inexpensive package.

In addition, since the functions are expanded, the applications are also widened, ■The demand per unit is expanded, and the mass production effect is useful for lowering costs.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the invention. In the figure, 1 to 3 are control terminals, 4 to 6 are functional blocks,
7 is a large-scale integrated circuit, 10~15.41~48°51
~58.61~68 are terminals, 20~28 and 30~3
8 each indicate an anchor circuit.

Claims (1)

[Claims] The external connection terminal portions of a plurality of functional blocks formed on one integrated circuit chip are connected to the external connection terminal portion of a package housing the integrated circuit chip via a switch portion formed on the same integrated circuit chip. 1. A function selection type integrated circuit, wherein any one of the plurality of functional blocks can be selected by connecting the plurality of functional blocks and controlling the switch section from the outside.