JPH0717158Y2 - Substrate for mounting programmable IC - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a programmable IC mounting substrate that facilitates the use of a programmable IC.

[Conventional technology]

Recently, programmable logic devices that users can write to realize arbitrary logic circuits have features such as a short development period and a small development cost that does not pose a problem. It is used mainly for devices with short lifespans, and is drawing attention. Compared to a few years ago, the number of rewritable CMOS versions has increased, and the number of large-scale products that can integrate hundreds of gates or more has also increased. In addition, the development tools have become more sophisticated, and anyone can easily develop them as if they were writing a circuit diagram. However, in a mass-produced system, it is still inferior to a gate array in terms of cost and the number of gates that can be integrated. Therefore, as a programmable IC that fills this gap, Xilinx Corporation of the United States has developed a programmable IC called a logic cell array (LCA). One of the features of LCA is that it can perform in-circuit emulation. In other words, the logic circuit is programmed in the personal computer, and the data is passed through the interface to the static RA inside the LCA-IC.
Since it is stored in M, new data can be rewritten.

Also, when disconnecting the interface with the personal computer, if a ROM that stores that data is connected, the data will be automatically transferred from the ROM to the LCA-IC when the power is input, and the static RAM inside the LCA-IC will be transferred. Data is written to. Figure 8 shows an example of using the LCA-IC. 81 is ROM, 82 is L
CA-IC, 83 indicates wiring for program loading.

In addition, the standard IC of the LCA-IC has input and output pins arranged in a square shape, and the existing boards that can accommodate sockets corresponding to them have been limited. Therefore, as shown in FIG. 9, several LCA's can be mounted, and a substrate with complicated wiring has been sold. Reference numeral 91 is a ROM memory socket, 92 is an LCA-IC socket, 93 is a program load wiring, and 94 is a pin insertion hole.

[Problems to be solved by the device]

In case of using this LCA-IC in experiments in the use example of FIG. 8, it is necessary to perform wiring with the ROM and several program control lines every time, which consumes a lot of time and complicated wiring. Because of this, incorrect wiring could occur.

Further, in the example of FIG. 9, the size is large and the places where it can be mounted are limited, so that it cannot be connected to another board and used with other circuits. Further, there is a drawback that some input / output pins are pre-wired and there is no freedom of wiring.

It is an object of the present invention to provide a programmable IC mounting substrate which solves the problems that a lot of time and labor are used for wiring when mounting the programmable IC and the number of boards that can be mounted is limited.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a programmable IC socket having one programmable IC, a memory socket having a ROM, a reprogramming switch for controlling reprogramming of the programmable IC, and the programmable IC. The reset switch for controlling the reset and the select switch for controlling the ROM address are arranged on the front surface of the substrate, and on the back surface of the substrate, the substrate is connected in parallel with another board and the programmable IC It features a structure with connection terminals that correspond to the input / output terminals.

[Action]

The present invention is designed for programmable IC socket, ROM socket, reprogramming switch, resetting switch, RO
The address selection switch of M is mounted on the same board,
Since the wiring for programming is made in advance, it can be made compact and the labor and time for wiring can be reduced. In addition, since the board is provided with connection terminals that can be connected in parallel with other boards, such as pins or connectors, it can be easily mounted on other boards and is programmable.
Connection terminals provided corresponding to the input / output terminals of the IC, for example, wiring of all pins can be freely installed. Embodiments will be described below with reference to the drawings.

〔Example〕

The following embodiments will be described by taking the LCA-IC of Xilinx Corporation as an example of the programmable IC.

Embodiment 1: FIG. 1 is a view for explaining the first embodiment of the present invention, in which 1 is a socket for LCA-IC, 2 is a socket for memory, and 3 is a socket for memory.
Is a reset switch, 4 is a reprogramming switch,
Reference numeral 5 is a memory address selection switch, and 6 is an input / output connector.

LCA-IC socket 1, memory socket 2, reset switch 3, reprogramming switch 4, memory address selection switch 5 are mounted on the same board, and the above-mentioned components are mounted on the memory socket 2. ROM200 to LCA-
Wiring is done to load the program data to the LCA-IC100 mounted on the IC socket 1. In addition, on the back side of the board, an input / output connector 6 having pins corresponding to the input / output pins of the LCA-IC100 is mounted in two rows.
It is connected to socket 1 for LCA-IC.

When the substrate of the present invention is used, it is mounted on another large board 21 as shown in FIG. The substrate of the present invention is
It can be mounted on a board in which the pin insertion hole 22 is open on one side, and a board in which the pin insertion hole is opened only in the vertical or horizontal direction. Wiring after mounting requires only power supply and ground. When the LCA-IC100 and ROM200 are installed, the program data of ROM200 is
Written to LCA-IC100. Also, if some program data is stored in the ROM 200 by changing the address, if you select an arbitrary address with the memory address selection switch 5 and press the reprogramming switch 4, the LCA-IC
100 program data replaces the program data stored in the above address. Also, after writing the program data to LCA-IC100, reset switch 3
You can reset the operating state of the programmed circuit by pressing.

Embodiment 2: FIG. 3 is a view for explaining the second embodiment of the present invention.
A program method selection switch 7 and a program download connector 8 are additionally mounted on the front side of the board shown in the first embodiment.

In the board shown in the first embodiment, program data can be written from the ROM 200 mounted as shown in the first embodiment, or can be written directly from an external personal computer by using a dedicated jig (Insert Kit EMI). Urator). In this case, although the setting of the programming method that has already been wired is ignored, there are many cases in which an error actually occurs and writing cannot be performed. The programming method selection switch 7 is a switch for writing smoothly without generating an error in any writing method.

The program download connector 8 is a connector for writing the program data directly from the personal computer with a jig simpler than the above-mentioned insert emulator.

Embodiment 3: FIG. 4 is a view for explaining the third embodiment of the present invention.
Reference numeral 1 is an LCA-IC socket, 2 is a memory socket, 3 is a reset switch, 4 is a reprogram switch, 5 is a memory address selection switch, and 9 is a socket with a lapping pin. Instead of the input / output connector 6 of the substrate shown in the first embodiment, a socket 9 with a wrapping pin is provided.

Memory socket 2, reset switch 3, reprogramming switch 4, memory address selection switch 5, lapping pin socket 9 are mounted on the same substrate.
Moreover, the rapping pin of the socket 9 with the rapping pin projects to the back surface of the substrate and serves as a connector for mounting on another board. Further, the socket 1 for LCA-IC is connected to the socket 9 with the wrapping pin. Between each of the above parts, the ROM200 installed in the memory socket 2 to the LCA-IC10 installed in the LCA-IC socket 1
Wiring for loading program data to 0 is made.

When the substrate of the present invention is used, it is mounted on another large board 10 as shown in FIG. The device of the present invention can be mounted on a board in which the holes for the pins are open. Wiring after mounting requires only power supply and ground. LCA-IC100 and ROM20
When 0 is installed, the program data in the ROM 200 is written in the LCA-IC100 immediately after the power is supplied. Also, if some program data is stored in the ROM 200 by changing the address, if you select any address with the memory address selection switch 5 and press the reprogram switch 4, the program data of the LCA-IC100 will change to the above. It replaces the program data stored in the address of. Also,
If the reset switch 3 is pressed after writing the program data into the LCA-IC100, the operating state of the programmed circuit can be reset.

Also, as shown in FIG. 6, this board is composed of several other LCA-IC10s.
By connecting 0 and the clock line and data line, these LCA
-By writing the program data of the IC100 in the ROM200 on the board all at once, all the LCA-IC100 programs can be programmed after the power is turned on. Therefore, the number and layout of the LCA-IC100s to be mounted can be set more freely than the board on which several LCA-IC100s are mounted in advance. 1
Reference numeral 1 indicates wiring for program loading.

Embodiment 4: FIG. 7 is a view for explaining the fourth embodiment of the present invention.
A program method selection switch 7 and a program download connector 8 are additionally mounted on the front side of the board shown in the third embodiment. These operations are the same as those shown in the second embodiment.

[Effect of device]

As explained above, since this board is compact and can be mounted on any board, it is possible to easily use multiple programmable ICs with other circuits without creating a board on which a new programmable IC can be mounted. You can
Saves money and time.

[Brief description of drawings]

 1 is a perspective view of the first embodiment, FIG. 2 is a usage example of the first embodiment, FIG. 3 is a perspective view of the second embodiment, and FIG. 4 is a perspective view of the third embodiment. Fig. 5, Fig. 5 is a usage example of the third embodiment, Fig. 6 is another usage example of the third embodiment, Fig. 7 is a perspective view of the fourth embodiment, and Fig. 8 is a conventional LCA. -Example of use of IC, Fig. 9 is a perspective view of a conventional LCA-IC board. 1,92 ...... LCA-IC socket 2 ...... Memory socket 3 ...... Reset switch 4 ...... Reprogramming switch 5 ...... Memory address selection switch 6 ...... Input / output connector 7 ...... Program method selection switch 8 …… Program download connector 9 …… Socket with pin for lapping 10,21 …… Board 11,83,93 …… Program load wiring 22,94 …… Pin insertion hole 81,200 …… ROM 82,100 …… LCA-IC 91 ...... ROM memory socket

Claims (1)

[Scope of utility model registration request] 1. A programmable IC socket (1) having one programmable IC, a memory socket (2) having a ROM, and a reprogramming switch (4) for controlling reprogramming of the programmable IC. , A reset switch (3) for controlling the reset of the programmable IC and a selection switch (5) for controlling the ROM address are arranged on the front surface of the board, and the back surface of the board has the board on the other board. Connection terminals (6, 9) connected in parallel with the programmable IC and corresponding to the input / output terminals of the programmable IC
A programmable IC mounting board, characterized by comprising: