JPS61213923A - Control system for data reception - Google Patents

Abstract

PURPOSE:To select automaticallty an oscillator for data reception in IMPL by counting pulses of a strobe pulse signal for a specific time, and selecting the specific oscillator on the basis of the counted value. CONSTITUTION:A selected disk device 2 sends out a pulse signal to the pulse signal line 21 of a bus. A control circuit 22 is signified in a controller 20 with a signal 13 indicating the start of IMPL and inputs a received pulse signal 21 to a counter 23 for a specific period, so that its pulses are counted. A control circuit 24 outputs a set and a reset signal for a flip-flop circuit 10 to signal lines 25 and 26 when the counter 23 counts up to specific values within the constant period. The output of the flip-flop circuit 10 is a selection signal for oscillators 5 and 6.

Description

[Detailed Description of the Invention] [Summary] Data reception when it is necessary to select and control an oscillator according to the data speed in a control device, etc. that controls a plurality of magnetic disk storage devices with different data transfer speeds. It is a control method. The number of pulses of the strobe pulse signal sent from the data transfer source to the control device during a certain period is counted, and a predetermined oscillator is selected based on the counted value.

[Industrial application field]

The present invention relates to a control device for a magnetic disk storage device of an information processing system, and the present invention relates to data reception in a control device when one control device controls a plurality of magnetic disk storage devices with different data transfer speeds. Regarding control method.

The data transfer speed of magnetic disk storage devices may differ depending on the model, and they are often used in a mixed manner within one system.

For this reason, a control device for a magnetic disk storage device may be configured to be able to control a plurality of storage devices with different data transfer speeds.

In such a control device, in order to synchronize the control within the control device with the data transfer rate, multiple oscillators with frequencies corresponding to the data transfer rate are prepared and a magnetic disk storage device to be controlled is selected. At this time, the oscillator is also switched, but if this switching is not performed correctly, the control device cannot correctly control the transferred data.

[Prior art and problems to be solved by the invention] FIG. 2 is a block diagram showing an example of the configuration of a magnetic disk storage system.

Magnetic disk storage devices (hereinafter referred to as disk devices) 2 and 3 are connected to the control device 1. For example, the disk device 2 has a storage capacity of 1229 KIl/S (7 kilobytes).
seconds), and the disk device 3 has a data transfer rate of 819 KB/S.

The control device 1 includes a control section 4 using a microprogram control method.
The oscillators 5 and 6 are provided in order to correspond to the two types of data transfer speeds mentioned above.

The oscillators 5 and 6 are oscillators that have oscillation frequencies corresponding to the above two types of data transfer speeds, and usually keep the oscillation frequencies within a predetermined frequency range so that they can follow fluctuations in the transfer speed within a predetermined range. It consists of a variable frequency oscillation circuit that can be controlled by.

In a normal operating state, when the controller 4 selects the disk device 2 or 3 and starts data transfer, the controller 4
The oscillator required for the selected disk device is identified by the control information held in the control memory within, and one of the oscillators 5 or 6 is activated by controlling the oscillator selection section 7. The output of the activated oscillator 5 or 6 is supplied to the required parts from the signal line 8.

For example, as shown in FIG. 3, the oscillator selection section 7 turns on/off the output signal of the flip-flop circuit 10.
The oscillator 5 or 6 is specified, and the control section 1 sets the flip-flop circuit 10 by the ON signal of the signal line 11 or 12.

However, when the control device 1 is powered on and started, the control unit 4 only holds a minimum control microprogram for so-called initial microprogram load (IMPL) in, for example, read-only memory. Most of the microprograms and control information become effective only after they are read from the disk device into the readable/writable control memory using IMPL.

Therefore, when receiving data transferred from a disk device for IMPL, since the control section 4 does not yet have control information indicating the data transfer rate of the disk device, the oscillator 5 or 6 cannot be selected.

For this purpose, during I MPL, the control unit 4 sends a signal 13 indicating IMPL to the oscillator selection unit 7, and by setting the switch 14, the signal 13 is semi-fixedly connected and a flip-flop is connected to one side. Set the circuit 10.

The switch 14 is set according to the data transfer rate of the disk device determined for IMPL when the control device 1 is installed.

According to the above-described conventional method, it is necessary to set the switch 14 of the control device when the configuration of the magnetic disk storage system 5 is determined and installed, or when the configuration is changed. Furthermore, since this setting is performed for each system, there is a problem in that there is a possibility that incorrect settings may be made for each installation.

[Means for solving problems]

FIG. 1 is a block diagram of the principle of the data reception system of the present invention.

Control part? Disk devices 2.3, which generally have different data transfer speeds, are connected to 1F20.

21 is the selected disk installation? A signal line that transmits pulse signals from &2 or 3 to the control device F20, 22 is a control circuit that supplies pulse signals to the counter 23 for a certain period of time, 2
4 is a control circuit that detects that the count value of the counter 23 has reached a predetermined value and outputs a signal, and 10 is a flip-flop circuit that outputs an oscillator selection signal.

[Effect]

For example, if the disk device 2 contains an IM such as a microprogram,
It is assumed that a disk device for storing PL information and for IMpt is connected to a fixed address, and the control device 20, for example, by a command from a higher-level processing device (not shown),
When IMPL is started, the disk device 2 is first selected using the above-mentioned predetermined address using a known method.

The selected disk device 2 is connected to the pulse signal line 21 of the bus.
Then, a pulse signal is sent out for the purpose of strobe of information transferred on other bus lines.

The pulse repetition period of this pulse signal has a constant value that varies depending on the data transfer speed of each disk device.

In the control device 20, the control circuit 22 is enabled by the signal 13 indicating the start of IMPL, and the control circuit 22 inputs the pulse signal received on the pulse signal line 21 to the counter 23 for a certain period of time, Count.

The control circuit 24 transmits the set/reset signal of the flip-flop circuit 10 to the signal lines 25 and 26 at a predetermined count value based on the output of the count value of the counter 23 during the above-mentioned period.
Output to.

The output of the flip-flop circuit 10 becomes the selection signal for the oscillator 5.6 as described above.

With the above configuration, for example, in the case of a low-speed pulse signal scheduled for the pulse signal of the pulse signal line 21, it is assumed that the count value of the counter 23 is smaller than M at the end of the above-mentioned fixed period, and in the case of a high-speed pulse signal It is assumed that M is larger than M, and that the output of the flip-flop circuit 10 needs to be turned off when a low-speed pulse signal is received, and turned on when other high-speed pulse signals are received.

In that case, by configuring the control circuit 24 to turn on the signal line 26 at the beginning (the count value is O) and turn on the signal line 25 at M, the desired oscillator can be selected. .

As described above, oscillator selection during IMPL is automatically and correctly performed without the need for manual switch settings for each system.

〔Example〕

FIG. 4 is a block diagram showing the configuration of an oscillator selection section according to an embodiment of the present invention.

For example, when the control device is powered on, the counter circuit 30
It has been reset to its initial state.

By turning on the signal line 13 indicating IMPL, the signal on the pulse signal line 21 passes through the gate and becomes the signal 1il.
A pulse signal is supplied to the counter circuit 30 while Ji31 is on.

For the signal on the signal line 31, for example, a tag gate signal sent to the bus for a period of 1.4 microseconds can be used to indicate the valid period of the address signal on the bus when selecting a disk device. can.

If the signal sent on the pulse signal line 21 is a high-speed pulse, the period is, for example, 0.1 microseconds, and a low-speed pulse is 0.8 microseconds, then the number of pulses in a period of 1.4 microseconds is: 14 and 1-2, respectively.

Therefore, the counter circuit 30 only needs to be able to count 3 or more, and when the count output is "3", the output of the gate 35 turns on the signal line 25 that sets the flip-flop circuit 10 on.

Further, the signal line 26 that resets the flip-flop circuit 10 to off is turned on by the output of the gate 36 when the count output is 0°.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the oscillator selection for data reception during IMPL is automatically performed in the control device of the magnetic disk storage device, etc., so that the magnetic disk storage system, etc. This has a significant industrial effect of improving performance and reliability.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention. FIG. 2 is a block diagram of a configuration example of a magnetic disk storage system. FIG. 3 is a block diagram of a conventional oscillator selection section. FIG. 4 is a block diagram of an oscillator selection section of the present invention. It is. In the figure, 1.20 is a control device, 2.3 is a disk storage device,
4 is a control section, 5.6 is an oscillator, 7 is an oscillator selection section, 10 is a flip-flop circuit, 11.12.13 is a signal line, 21 is a pulse signal line, 2
2. 24 is a control circuit, 23 is a counter, 30 is a counter circuit, 31 is a signal line, 35. 36 is a gate 11! ] death 2 garden

Claims (1)

[Scope of Claims] Data transmitted by a plurality of devices (2, 3) having different data transfer rates is received, and the data is transmitted by using oscillators (5, 6) with frequencies corresponding to the data transfer rates. In a control device (20) that performs control in synchronization with the transfer rate, a pulse signal (21) transferred from the above devices (2, 3)
means (22, 23) for counting the number of pulses for a predetermined period of time;
and means (24, 10) for selecting one of the oscillators based on the count value output of the counting means (23).