JPH0421024A - Automatic initializing circuit for video interface - Google Patents

Abstract

PURPOSE:To attain the automatic initialization of a video interface by reading in an ID code incorporated in an interface cable through an I/O port, reading out the corresponding parameter from a memory, and setting it to each function block. CONSTITUTION:A host interface cable constituted of a connector 1 and a signal line (a) inputs a video signal inputted from the signal line (a) to an image input circuit 7 through a signal line (h). An ID code incorporated in the connector 1 is inputted to an I/O port 4 through a signal line (b), and inputted to a CPU 5 through a signal line (d), a CPU bus (c), and a signal line (e). The CPU 5 reads out a parameter having the same ID code as the inputted ID code from a memory 6, and inputs and sets it to the image input circuit 7 through a signal line (g). In such a manner, the automatic initialization of a video interface can be attained.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a video interface circuit for a hard copy device that automatically sets parameters according to the host computer of each company to be connected. Concerning automatic initialization circuits.

[Summary of the Invention] The present invention reads an ID code built into an interface cable through an interface cable when a hard copy device is powered on or reset, and each host computer to be connected corresponding to the ID code is read. The video interface is automatically initialized by reading the corresponding parameters from memory and setting them in each functional block.

[Prior Art 1] Conventionally, in the video interface circuit of a hard copy device, parameters corresponding to each host computer to be connected are inputted by operating a key switch after power is turned on or after the device is reset. Furthermore, by storing these parameters in memory, when using the same host for the second time or later, the parameters in the memory are loaded and started up without having to input parameters.

[Problem to be solved by the invention]

With conventional technology, there are a large number of parameters to be set, so the settings must be set and checked many times.
It was taking time.

Also, the method of starting up by loading parameters stored in memory is fine when used with the same host computer, but if the host computer to be connected changes, the previous parameters must be changed. , the drawback was that parameter input and settings had to be restarted from the beginning.

[Means to solve the problem]

In order to solve the conventional problems, the present invention comprises a host interface cable with a built-in ID code, an input port for reading the ID code, and a memory containing parameters corresponding to each host computer to be connected. And so.

[Operation] The ID code built into the host interface cable is read by the IO port and sent to the CPU configured according to the prior art.

The CPU reads a parameter group corresponding to the input ID code from the memory and sets it to each functional block.

F Example] An embodiment of the present invention will be described below based on the drawings.

In FIG. 1, a host interface cable consisting of a connector 1 and a signal line a inputs a video signal inputted from a signal line a to an image capture circuit 7 constituted by a conventional technique via a signal line. do. The ID code built into the connector 1 is input to the IO port 4 via a signal line. I input to IO port
The D code is input to the CPU 5 configured according to the prior art via the signal line d and the CPU bus C1 signal line e. The CPU 5 transfers the parameter having the same ID code as the input ID code from the memory 6 to the signal line f and CP.
It is read out via the U bus C, and input and set to the image capture circuit 7 via the signal line g. After the settings are completed, the image capture circuit 7 captures video data according to the set parameters.

Figure 2 shows details of the ID code built-in part in Figure 1.The example shown in this figure shows the case where ID code = 1101 is generated.Pull-up resistor 3 generates code l. The GND connection line 2 is for generating code O.

In the example shown in FIG. 2, in the connection process within connector 1, P3
and P5 are connected, and only bit 2 is 0 and the other bits are 1. Therefore, the parameter set No. 3 shown in the following table is to be loaded, and by setting this parameter set in the image capture circuit, it becomes possible to capture video data from the corresponding host computer.

In this embodiment, as shown in the table, connection of 16 types of host computers is supported, but it goes without saying that expansion is possible by increasing the number of bits of the ID code. Also, the contents of the tree table are in memory 6.
It is stored in .

By executing the series of operations described above when the hard copy device is powered on or reset, the video interface can be automatically initialized.

[Effects of the Invention] As described above, the present invention has the advantage that it is not necessary to input parameters when the power is turned on or after resetting the hard copy device, and further, it is not necessary to re-enter parameters or initialize when changing the host computer. has.

It also has the effect of preventing time loss during initialization due to input errors.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing details of an ID code generating section in the embodiment of the present invention. Connector GND connection line pull-up resistor I10 port PU Memory image capture circuit or higher

Claims (1)

[Claims] A host interface cable with a built-in ID code, an input port for reading the ID code, a built-in memory that associates parameters corresponding to each host computer to be connected with the ID code, and a connection according to the ID code. It consists of a means for reading parameters corresponding to the host computer to be used from memory, and a means for setting the read parameters to the video interface of the hard copy device, making it possible to automatically set parameters according to each host computer when the power is turned on. An automatic initialization circuit for a video interface, characterized in that: