JPH052455A - Optical reproducing device - Google Patents

Abstract

PURPOSE:To perform the data communication with a reproducing device even when an exclusive-use I/F board does not exist by selecting a communicating circuit of either of the parallel communication or the serial communication and performing the data communication between the reproducing device and an external control means. CONSTITUTION:A P/S communication selecting circuit 8 detects the operation condition of a switch 10 and inputs the output data from a CD-ROM decoding circuit and a host I/F circuit 5 to a parallel communicating circuit 6 or a serial communicating circuit 7. When a program for parallel communication is incorporated in a host computer 12, the switch 10 is switched to a parallel communicating side. The P/S communication selecting circuit 8 inputs the data to the parallel communicating circuit 16, and the communication is performed by the control of the program for the parallel communication of the host computer 12. Even when the program for serial communication is incorporated in the host computer, the serial communication is also performed. Thus, even without the exclusive-use I/F board, the data communication is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical reproducing device for optically reading and reproducing information (hereinafter referred to as a reproducing device), and particularly to connection with an external control device (host computer) for controlling the device. It is a thing.

[0002]

2. Description of the Related Art To reproduce information recorded on a CD-ROM (read-only memory using a compact disk) disk (hereinafter referred to as a disk), a reproducing device equipped with a pickup for optically reading the information, A host computer for controlling the reproducing apparatus, a CRT display device (hereinafter referred to as CRT) for displaying information read from a disc, and a keyboard device for inputting data and commands to the host computer are required, and these are predetermined. Be connected in the way.

In the case of connecting a playback device and a host computer, conventionally, a dedicated I / F (interface) board is attached to an expansion slot of the host computer, and the playback device and the host are connected only by so-called parallel communication using the dedicated I / F board. I was doing data communication with a computer.

[0004]

However, a computer without an expansion slot (for example, a laptop personal computer, a notebook personal computer, etc.) cannot be equipped with a dedicated I / F board, and therefore this type of computer and a playback device cannot be used. It has a problem that it cannot be directly connected to the device.

The present invention has been made in view of the above problems of the prior art, and makes it possible to connect a reproducing apparatus to any computer regardless of the type of the computer, and to connect the reproducing apparatus. Another object of the present invention is to provide an optical reproducing device capable of data communication with the reproducing device without the dedicated I / F board required for the host computer.

[0006]

SUMMARY OF THE INVENTION The present invention is an optical reproducing apparatus to which an external control means for controlling an optical reproducing apparatus for optically reading and reproducing information is connected. Any one of first and second communication means for performing data communication with the control means, input / output processing means for temporarily storing and inputting / outputting input / output data, and one of the first and second communication means It is characterized by comprising a selective connection means for selectively connecting one and a switching means for switching to either one of the first and second communication means.

Further, the first communication means is a connection circuit to the dedicated I / F board of the external control means.

Further, the second communication means is a connection circuit with a printer port provided in the external control means.

The second communication means includes a latch means for latching 1-byte data, and a selecting means for selecting the data latched by the latch means every 2 bits.
The present invention is characterized by comprising counting means for counting the pulses of the read signal output from the external control means, and reset means for resetting the counting means when the counting means makes a predetermined count.

[0010]

According to the present invention, in the reproducing apparatus, a connection circuit (parallel communication circuit) for connecting the dedicated I / F board of the external control means and a connection circuit (serial communication circuit) for the printer port provided in the external control means. Is provided in advance, and either the parallel communication or the serial communication is set in advance by the switching means, the setting state is detected by the selection connecting means, and the communication circuit which is set is selected, and the reproducing device and the external control means are set. Data communication with.

[0011]

1 to 4 show an embodiment of the present invention. FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 shows a serial communication circuit of the present invention. FIG. 3 is a configuration diagram, FIG. 3 is a timing diagram when 1-byte data is divided into four and output, and FIG. 4 is a block diagram showing a second embodiment of the present invention.

In FIG. 1, (1) is a reproducing apparatus main body,
(2) is a CPU (central processing unit) which controls the overall control of the entire apparatus, and (3) is a disk which is rotationally driven by a drive motor (not shown). (4) is a CD-DA decoding circuit for decoding a data string read from the disk (3) by a pickup (not shown) into CD-DA (Digital Audito) format serial data, and (5) is C
The signal output from the D-DA decoding circuit (4) is sent to the CD-R.
CD-ROM decoding circuit and host I / F circuit for decoding OM data signal, (6) parallel communication circuit, (7)
Is a serial communication circuit, and (8) is a P / S (parallel / serial) communication selection circuit, and either the parallel communication circuit (6) or the serial communication circuit (7) is selected depending on the operating state of the switch (10) described later. select. (9) is an I / O (input / output) buffer circuit for temporarily storing and inputting / outputting input / output data, (10) is a switch for switching to a desired communication circuit of parallel communication or serial communication,
(11) is a servo and drive circuit and is a disk (3)
The servo system for focus adjustment and track following of the pickup for reading the above information and the drive system for reciprocating the pickup in the radial direction of the disk (3) are controlled.
Reference numeral (12) is a host computer having a printer port (13) for controlling the reproducing apparatus (1), which is connected to the reproducing apparatus (1) by an I / F cable (14).
Reference numeral (15) is a CRT, which performs display according to execution of processing under the control of the host computer (12). Reference numeral (16) is a keyboard device for inputting data and commands to the host computer (12).

When reproducing information on the disc (3) in the optical reproducing apparatus having the above-mentioned structure, the host computer (12) stores data and commands necessary for reproducing the information by the keyboard device (16). )
To the playback device (1) and host computer (1
It is executed by a desired communication method (parallel communication or serial communication) with 2). The data string read by the pickup from the disc (3) is input to the CD-DA decoding circuit (4) and decoded into serial data in a predetermined CD-DA format. The decrypted data is a CD
-It is input to the ROM decoding circuit and the host I / F circuit (5) and is decoded as a CD-ROM data signal. Then, the P / S communication selection circuit (8) detects the operation state of the switch (10) and outputs the output data from the CD-ROM decoding circuit and the host I / F circuit (5) to the parallel communication circuit (6) or Input to the serial communication circuit (7). When the parallel communication program is installed in the host computer (12), the switch (10) is switched to the parallel communication side. The P / S communication selection circuit (8) inputs data to the parallel communication circuit (6), and communication is performed under the control of the parallel communication program of the host computer (12). When the serial communication program is installed in the host computer (12), the switch (1
0) is switched to the serial communication side. The P / S communication selection circuit (8) inputs data to the serial communication circuit (7),
Communication is performed by the serial communication program of the host computer (12).

Thus, the data output from the CD-ROM decoding circuit and the host I / F circuit (5) passes through the I / O buffer circuit (9) and the I / F cable (14) in the designated communication circuit. Then, the desired information is sent to the host computer (12) and the desired information is displayed on the CRT (15).

Now, the serial communication circuit (7) used in the reproducing apparatus (1) of the present invention will be described. FIG. 2 is a block diagram of the serial communication circuit (7).

In FIG. 2, WR (Wright) and DAT
A, STEN (Status Enable), DTEN (Data
Enable), C / D (Commmand / Data), RD
(Read), DH (Data High) and DL (Data
Lower) is a signal line, and is effective in the arrow direction. The WR signal causes the command from the host computer (12) to be stored in the memory of the CD-ROM decoding circuit and the host I / F circuit (5). DATA is a data bus dedicated to commands. The STEN signal and the DTEN signal are signals indicating that the reproducing apparatus (1) can output status or data to the host computer (12), respectively. In other words, when it enters the standby state for sending the status to the host computer (12), STEN
The signal becomes low level, and the DTEN signal becomes low level in a standby state for sending data. DH will be described later 8
The upper bit data of the data latched by the bit latch circuit (17) is output, and DL is the lower bit data output of the data latched by the 8-bit latch circuit (17). (17) is a transparent-type 8-bit latch circuit that latches the data output from the CD-ROM decoding circuit and the host I / F circuit (5) to 8 bits, (18) is channel 1 (18a), channel Two
(18b) and a channel control section (18c) are used to select the data latched in the 8-bit latch circuit (17) for 4 bits in the channel 1 (18a).
Channel 4 (18b) selects 4-bit data. (19) is a read pulse counter that counts the pulses of the RD signal output from the host computer (12), and is composed of a 2-bit binary counter.
(20) is a clear signal generating circuit which detects the rising or rising edge of the C / D switching signal and resets the read pulse counter (19).

Now, serial communication by the serial communication circuit (7) configured as described above will be described with reference to FIG.

First, the clear signal generating circuit (20) detects the rising or falling edge of the C / D switching signal and resets the read pulse counter (19) to "0". When the read pulse counter (19) is in the reset state, the RD signal is input from the host computer (12) to the read pulse counter (19), and the CD-ROM decoding circuit and the host I / F are synchronized with the pulse of this signal.
At the same time that 1 byte of data is latched from the circuit (5) to the 8-bit register circuit (17), the channel 1
(18a) and channel 2 (18b) are controlled by the channel controller (18c), and BIT7 and BIT6 are selected from the latched data and output to DH and DL, respectively. At this time, the read pulse counter (1
9) counts "1". Host computer (1
The next RD signal from 2) is the read pulse counter (19).
Channel 1 (18a) and channel 2 (18b) are controlled by the channel controller (8c), and BIT5 and BI among the latched data
T4 is selected and output to DH and DL respectively. Then, the read pulse counter (19) detects the falling edge of the pulse of the RD signal and counts as "2".
In this way, each time the RD signal is input to the read pulse counter (19), the read pulse counter (19) detects the falling edge of the pulse and counts by "1", and the selector (18) operates as an 8-bit latch. Circuit (17)
As shown in Table 1, the data latched at 1 is divided into 4 by 2 bits and output to DH and DL respectively, and 1-byte 8-bit data is processed. The read pulse counter (19) is reset to "0" by the input of the fourth RD signal.

[0019]

[Table 1]

By the way, the operator decides whether to execute the parallel communication or the serial communication based on the presence / absence of the I / F board of the host computer (11) or the input / output mode of the data bus of the printer port (11). The changeover switch (10) is operated in advance.

For example, when the host computer (12) has no expansion slot and the I / F board is not attached to the host computer (12), the I / F cable (14) is connected to the printer port (13) of the host computer (12). , Serial communication or parallel communication is set by the changeover switch (10) under the following conditions.

Serial communication when the data bus of the printer port (13) of the host computer (11) is dedicated to output.

Even if the data port of the printer port (13) of the host computer (11) can output bidirectionally and the output direction can be controlled by the control program, the control program can operate the printer port (12) bit by bit. When this happens, serial communication is used.

Parallel communication when the data bus of the printer port (12) of the host computer (11) can output bidirectionally and the output direction can be controlled by a control program.

On the other hand, the host computer (11) has an I / O
When the F board is attached, parallel communication is executed with the reproducing device (1) as in the conventional case.

FIG. 4 shows a second embodiment of the present invention. In the second embodiment, a P / S switching detection circuit (21) is provided as shown in the figure, and a host computer (12) is provided.
Parallel communication or serial communication may be automatically selected by detecting the mode identification signal output from.

[0027]

As described above, according to the present invention, a computer which cannot be mounted with a dedicated I / F board having no expansion slot can be connected to the reproducing apparatus, and the dedicated I / F can be connected. Data communication with the playback device can be performed without the board, and the dedicated I / F board can be omitted, which is effective for cost reduction.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a serial communication circuit.

FIG. 3 is a timing diagram when 1-byte data is divided into four and output.

FIG. 4 is a block diagram of a second embodiment of the present invention.

[Explanation of symbols]

1 Playback device body 2 CPU 3 CD-ROM disc 4 CD-DA decoding circuit 5 CD-ROM decoding circuit and host I / F circuit 6 Parallel communication circuit 7 Serial communication circuit 8 P / S communication selection circuit 9 I / O buffer circuit 10 switches 11 Servo and drive circuits 12 Host computer 13 Printer port 14 I / F cable 15 CRT 16 keyboard device 17 8-bit latch circuit 18 selector 18a channel 1 18b channel 2 18c channel controller 19 Read pulse counter 20 Clear signal generation circuit 21 P / S switching detection circuit

Claims (4)

[Claims] 1. An optical reproducing apparatus connected to an external control means for controlling an optical reproducing apparatus for optically reading and reproducing information, wherein data communication is performed between the optical reproducing apparatus and the external control means. And the second communication means for performing the above, the input / output processing means for temporarily storing and inputting / outputting the input / output data, and the selective connection means for selectively connecting either one of the first and second communication means. And an switching means for switching to either one of the first and second communication means. 2. The optical reproducing apparatus according to claim 1, wherein the first communication unit is a connection circuit with a dedicated interface board of the external control unit. 3. The optical reproducing apparatus according to claim 1, wherein the second communication unit is a connection circuit with a printer port provided in the external control unit. 4. The second communication means outputs from the external control means, a latch means for latching 1-byte data, a selection means for selecting the data latched by the latch means every 2 bits. 4. The optical reproducing apparatus according to claim 3, further comprising: counting means for counting the pulses of the read signal; and resetting means for resetting the counting means when the counting means performs a predetermined count.