JPH0528091A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To accurately transmit data in a short time. CONSTITUTION:A storage means 65 where data transmitted from a transmission side control part 38 is temporarily stored, a confirming means 66 which confirms coincidence/disaccord between data received by a reception side control part 47 and data stored in the storage means 65, a setting means 67 which sets the time for confirmation processing of coincidence/ disaccord, and an interrupt signal transmitting means 68 which transmits an interrupt signal to the transmission side control part 38 to transmit the same data from this part 38 at the time of not confirming the coincidence between both data within this set time are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission device for transmitting and receiving control commands and the like between a plurality of control units.

[0002]

2. Description of the Related Art Data processed by a computer is recorded on an auxiliary recording medium such as a magnetic disk. However, there is a limit to increase the recording capacity of this magnetic disk. Magnetic tape players are starting to be used as backup data.

FIG. 4 is a block diagram showing a schematic electrical configuration of a conventional magnetic tape player. A magnetic tape player 1 shown in FIG. 1 includes a control unit 2 mainly composed of a CPU (Central Processing Unit) which functions as a control center of the entire apparatus, and a signal processing circuit which processes a signal transmitted from the outside. A system controller unit 4 having a group 3, a control unit 5 having the same configuration as the control unit 2, and a mechanical driver group for sending a drive signal to each drive unit of the magnetic recording / reproducing unit connected to the output side. 6. A recording controller section 8 having an amplifier group 7 for amplifying PCM signals output from the signal processing circuit group 3 of the system controller section 4, a rotary drum 10 for writing data to the magnetic tape 9, and the like. It is composed of three parts of the magnetic recording / reproducing section 11 including a drive mechanism section group.

In the magnetic tape player 1 having such a configuration, the control unit 2 of the system controller unit 4 outputs a control command to the control unit 5 of the recording controller unit 8 to cause each unit of the magnetic recording / reproducing unit 11 to operate. It is designed to control the movement.

As a method of transmitting and receiving this control command,
There are two things. (1) A method in which the control unit 2 on the transmission side only sends a control command and the control unit 5 on the reception side does not confirm the received control command. This is called a free running control procedure. (2) First, the control unit 2 on the transmission side sends a request command to the control unit 5 on the reception side. The control unit 5 that has received this request command transmits an acknowledge command to the control unit 2 on the transmission side. The control unit 2 receiving this acknowledge command sends a specific control command to the control unit 5. This method is called a basic data transmission control procedure.

[0006]

However, in the above method (1), whether the control command received by the control unit 5 on the receiving side is the same as the control command sent from the control unit 2 on the transmitting side. I can not confirm. Therefore, there is a case where the transmitted control command and the received control command do not match due to noise mixed in during transmission, and in this case, a malfunction occurs.

On the other hand, according to the method (2) (basic data transmission control procedure), the control command can be surely transmitted, but the transmission control code (the request command etc.) for that purpose is transmitted to the control section 2. It takes a long time to transmit and receive between 5 units. In this case, if the processing speed of the control unit 5 on the receiving side is lower than the processing speed of the control unit 2 on the transmitting side, the control unit 2 on the transmitting side outputs the signal until the acknowledge command is received. Since the system waits until it is received, the disadvantage that other processing is interrupted and the processing is delayed remains unsolved.

[0008] Therefore, an object of the present invention is to provide a data transmission device capable of accurately transmitting data in a short time.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention is for temporarily transmitting data transmitted from a transmission side control unit in a data transmission apparatus for transmitting and receiving data between a plurality of control units. Storage means for storing in, a confirmation means for confirming a match / mismatch between the data received by the receiving side control unit and the data stored in the storage means, and a setting means for setting a time for performing this match / mismatch confirmation processing, If no match between both data is confirmed within this set time,
An interrupt signal sending means is provided for sending an interrupt signal to the transmission side control unit and retransmitting the same data as the above from the transmission side control unit.

[0010]

According to the operation of the present invention having the above-mentioned structure, the data transmitted from the transmission side control unit is stored in the storage means and received by the reception side control unit. The data stored in this storage means and the data stored in the receiving side control unit are
The confirmation means confirms the match / mismatch. When this confirmation is not made within the time set by the setting means, the interrupt signal sending means sends an interrupt signal to the transmitting side control section. By this transmission, the transmission side control unit once suspends the program that was being executed until it receives the interrupt signal, and transmits the same data as above to the reception side control unit again. In this way, for a short time,
In addition, it is designed to enable accurate data transmission.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 2 is a block diagram showing an electrical configuration of a rotary drum type magnetic tape player as one embodiment, FIG. 1 is a block diagram showing a detailed configuration of the data transmission device shown in FIG. 2, and FIG.
FIG. 3 is a schematic top view showing the mechanical configuration of the magnetic tape player shown in FIG. 2. A rotary drum type magnetic tape player 20 shown in FIG. 3 is loaded with a tape cassette 22 in which a magnetic tape 21 is wound and housed, and a reel stand provided for rotation of a reel in the loaded tape cassette 22. A cassette loading section 25 provided with 23 and 24, loading bases 28 and 29 for pulling out the magnetic tape 21 accommodated in the tape cassette 22 along the guide grooves 26 and 27, respectively, and the loading base 2
The magnetic tape 21 drawn out by 8, 29 is wound and the rotary drum 3 for writing and reading information
0, and a pinch roller 31 and a capstan 32 for feeding and driving the pulled-out magnetic tape 21 at a constant speed. In addition, four magnetic heads Ha to H are provided on the contact surface of the rotary drum 30 with the magnetic tape 21.
d are attached at 90 ° intervals.

Next, the electric system will be described with reference to FIG. The rotary drum type magnetic tape player 20 according to the present embodiment is roughly composed of a system controller section 35, a recording controller section 36, and a magnetic recording / reproducing section 37. The system controller unit 35 is a CPU (Centra) that functions as a control center of the entire apparatus.
l Processing Unit) 38 and a memory (RAM (Random Access) for temporarily storing data transferred from the outside.
Memory)) 39 and a SCSI controller 41 for controlling PCM data sent from a host computer (not shown) to the memory 39 via a SCSI bus 40. Reference numeral 42 is an interface for sending a control signal to the recording controller unit 36, and 43 is a PCM interface for sending the PCM data stored in the memory 39 to the recording controller unit 36 as continuous serial data for each frame. ..

The magnetic recording / reproducing section 37 includes a loading motor M for driving the loading bases 28 and 29.
d, a reel motor Mc that selectively drives the reel bases 23 and 24 to rotate, a capstan motor Mb that drives the capstan 32 to rotate, a drum motor Ma that drives the rotary drum 30 to rotate, and attach to the rotary drum 30. The magnetic heads Ha to Hd described above, the write amplifier 44 and the read amplifier 45 to which the pair of magnetic heads Ha and Hb are connected, and the magnetic recording / reproducing unit 3
And a group of detectors 46 for detecting various states in 7.

The recording controller section 36 has a CPU 47 for separately controlling each circuit in the recording controller section 36 based on a control signal sent from the system controller section 35, and the system controller section. Formatting the PCM data sent from the memory 39 in the 35 into data including ATF data, etc.
A CM recording unit 48, an RF amplifier 49 that amplifies the formatted data, an error correction circuit that corrects a write error of the data read via the magnetic heads Hc and Hd, the reading amplifier 45, and the RF amplifier 49. 50, a drum motor control circuit unit 51 for controlling the drum motor Ma, a motor control circuit unit 52 for controlling the loading motor Md, the reel motor Mc and the capstan motor Mb, and a detector group 46 in the recording / reproducing unit 37. And a sensor interface 53 for sending a signal from the CPU 47 to the CPU 47.

The drum motor control circuit section 51 includes an amplifier 5 for amplifying detection signals from the frequency detector (FG) and the phase detector (PG) provided in the drum motor Ma.
4, a drum servo circuit 55 that receives the detection signal amplified by the amplifier 54 and controls speed servo and phase servo of the drum motor Ma, and a drum control amplifier 56 that amplifies the drum servo signal.
A drum motor driver 57 that rotationally drives the drum motor Ma according to the amplified control signal is provided.

The motor control circuit section 52 includes a capstan servo circuit 58 and the capstan servo circuit 58.
Capstan control amplifier 59 for amplifying the control signal from the
A capstan motor driver 60 for controlling the capstan motor Mb by the amplified control signal; and a frequency detector (F
G) 61 for amplifying the detection signal from (not shown),
A reel drive motor Mc and a motor drive circuit 62 for driving the loading motor Md are provided. 63
Is an interface interposed between the CPU 38 and the CPU 47.

A data transmission device 64, the details of which will be described later, is installed between the interface 42 of the system controller section 35 and the interface 63. The configuration of the data transmission device 64 will be described with reference to FIG. The illustrated data transmission device 64 is an RA that temporarily stores the data transmitted from the transmission side control unit 38.
Storage means 65 comprising M (Random Access Memory),
Confirmation unit 66 for confirming whether or not the data received by the reception side control unit 47 matches the data stored in the storage unit 65.
And a timer setting means 67 for setting a time for performing this matching / non-matching confirmation processing, and when the matching of both data is not confirmed within the set time, the transmission side control section 38.
An interrupt signal to the sending side control unit 3
8 is provided with an interrupt signal transmitting means 68 for retransmitting the same data as above.

The operation of the rotary drum type magnetic recording tape player having the above construction will be described mainly by focusing on the data flow in the data transmission apparatus shown in FIG. If, for example, a control command to rotate the reel motor Mc is transmitted from the control unit 38 on the transmission side, the control command is received by the control unit 47 on the reception side and simultaneously transferred to the storage unit 65. Also, the setting means 67 is set by the transmission of this control command. The transmission side control unit 38 that has transmitted this control command
Executes another preset processing routine program.

On the other hand, the receiving side control section 47 transfers the received control command to the confirmation means 66. Further, a control command is transferred from the memory 65 to this confirmation means,
Here, it is confirmed that the two control commands do not match. If it is confirmed that the two control commands match each other within the time set by the setting means 67, the operation corresponding to the control command is executed. If they do not match, an interrupt signal is sent from the interrupt signal sending means 68 so as to send the same control command again to the transmission side control unit 38.

Upon receiving the interrupt signal, the transmitting side control unit 38 temporarily stops the routine program that was being executed until the interrupt signal is received and saves it in the memory, and the interrupt routine program specified by the reception of the interrupt signal. To execute. By executing this interrupt routine program, the same control command as above is sent again.

By the way, when the confirmation processing by the confirmation means 66 is not executed within the processing time set by the setting means 67, an interrupt signal is transmitted from the interrupt signal transmission means 68. Upon receiving this interrupt signal, the transmission side control unit 38 temporarily stops the routine program that was being executed until it received this interrupt signal, saves it in memory, and executes the interrupt routine program specified by the reception of the interrupt signal. ..

As described above, in this embodiment, since the data transmission device 64 having the above-described configuration is provided between the transmission side control unit 38 and the reception side control unit 47, the confirmation of the control command, etc. Since it is executed by the transmission device itself, the transmission side control unit 38 can execute another routine program after sending the control command.

Further, when confirmation cannot be performed within the time set by the setting means 67, an interrupt signal is sent again to the transmission side control unit 38 at the time when the set time expires. It is possible to prevent the processing time from being delayed. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist thereof. In the above-described embodiment, the control command is described as an example of data, but the same applies to text data and other binary data.

[0024]

According to the present invention described in detail above, the storage means for temporarily storing the data transmitted from the transmission side control section, the data received by the reception side control section and the data stored in the storage section. Confirmation means for confirming coincidence and non-coincidence with each other, setting means for setting a time for performing the coincidence / non-coincidence confirmation processing, and when no coincidence of both data is confirmed within the set time, the transmission side control section is notified. By providing the interrupt signal transmitting means for transmitting the interrupt signal and retransmitting the same data as the above from the transmitting side control unit, it is possible to provide a data transmission device capable of accurately transmitting data in a short time. ..

[Brief description of drawings]

FIG. 1 is a block diagram showing a detailed configuration of a data transmission device shown in FIG.

FIG. 2 is a block diagram showing an electrical configuration of a rotary drum type magnetic tape player as one embodiment.

FIG. 3 is a schematic top view showing a mechanical configuration of the magnetic tape player shown in FIG.

FIG. 4 is a block diagram showing a schematic electrical configuration of a conventional magnetic tape player.

[Explanation of symbols]

 38 transmission side control unit 47 reception side control unit 65 storage means 66 confirmation means 67 setting means 68 interrupt signal transmission means

Claims (1)

Claim: What is claimed is: 1. In a data transmission device for transmitting and receiving data between a plurality of control units, a storage unit for temporarily storing the data transmitted from the transmission side control unit, and a reception side control unit. Confirmation means for confirming a match / mismatch between the data received in step S1 and the data stored in the storage means, a setting means for setting a time for performing this match / mismatch confirmation processing, and a match between both data within the set time. When the above is not confirmed, an interrupt signal sending means for sending an interrupt signal to the transmission side control unit and retransmitting the same data as the above from the transmission side control unit is provided.