JPH10124444A - Automatic master and slave setting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set every master and slave by means of the software of a computer after it's built in without operating the switches of every storage and to improve the changing flexibility and easiness of both master and slave while maintaining the compatibility of an IDE interface. SOLUTION: This system consists of a storage 5, a storage 6, a CPU 13, a bus 19 serving as an IDE interface, an automatic master/slave setting circuit 16 which sets the masters and slaves of both storages 5 and 6, and a backup memory 17 which stores the information to be sent to the circuit 16. In such a constitution, the master/slave information stored in the memory 17 is rewritten by software and the circuit 16 produces a master/slave switch signal based on the rewritten master/slave information. Then the storages 5 and 6 operate by the master/slave switch signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an automatic master / slave setting system for a storage device of a computer, and more particularly, to an automatic master / slave setting system for a storage device connected by an IDE interface.

[0002]

2. Description of the Related Art IDE and EIDE in the prior art
In an interface storage device (hereinafter, IDE is also included in IDE), two master and slave devices can be connected to one address, and two addresses of primary and secondary are connected. Since one address can be used, a total of four storage devices can be connected. Two storage devices connected to one address are used one as a master and the other as a slave, and the master and slave of the storage device are jumper switches on the storage device, which are used in advance before installation. , Set as a master or a slave, and built into the computer.

Alternatively, by setting a jumper switch on a master / slave setting cable and using a dedicated cable and connecting the cable to a master connector or a slave connector of the cable, the master or slave is mechanically connected. Is set.

[0004] In these devices, the master and slave cannot be changed after being incorporated. For one address, two storage devices are connected in cascade, so
For access to the master storage device or access to the slave storage device, a bit is set in a register inside the storage device to indicate whether to call the master or to call the slave. Only the device is accessed.

[0005] For example, in the method described in Japanese Patent Application Laid-Open No. Hei 4-260916, the computer can be started only from the storage device connected to the master. The problem is solved by classifying the hard disk as a connected storage device by the type of interface, that is, by using different addresses. However, when the number of interfaces and addresses is increased, the scale of the device is increased, and compatibility is lost.

[0006]

A first problem of the above-mentioned prior art is that compatibility of the IDE interface cannot be maintained. The reason for this is that the addresses are increased to deviate from the two addresses defined by the ATA, ATA2, and ATA3 standards as IDE standards in order to use them as storage devices that can all be started.

The second problem is that the conventional computer has
The storage device connected to the DE interface is inflexible because the storage device must be set before installation by using a switch on the storage device or a jumper switch to determine whether the storage device is used as a master or a slave. It is. The reason for this is that the current IDE interface connection cables are laid in parallel in order to connect the two devices in a daisy chain, and are not individually and individually wired.

[0008] The third problem is that if the master / slave is to be changed after the storage device is installed, the computer must be disassembled and the jumper switch of the storage device must be changed. It takes time and effort. The reason is that the storage device has a switch for setting and cannot be changed by software.

[0009] An object of the present invention is to set the respective masters and slaves when two storage devices are connected to a computer by an IDE interface without operating the switches of the individual storage devices, An object of the present invention is to improve flexibility and easiness of changing a master and a slave while enabling setting from software of a computer and maintaining compatibility of an IDE interface.

[0010]

A first master / slave automatic setting system according to the present invention comprises a CPU and a first type indicating a type.
A first storage device having first device attachment information indicating type information and presence information, a second storage device having second type information indicating type and second device attachment information indicating presence information, and the CPU A backup memory in which master / slave information is stored in accordance with an instruction from software executed in the first and second types of information;
Master / slave automatic setting circuit for determining a master and a slave of the first and second storage devices based on the second and the second device attachment information and the master / slave information; and the CPU and the first and second storage devices And a bus connecting the backup memory and the master-slave automatic setting circuit.

The second master / slave automatic setting system of the present invention is the first master / slave automatic setting system, wherein the master / slave automatic setting circuit comprises:
A NOR circuit for creating a NOR logic between the first device mounting information and the second device mounting information; and (b) a flip-flop in which the master-slave information from the backup memory is set by a set signal from the bus (C) an inverter for inverting the output of the flip-flop, (d) a first OR circuit for encoding the first type information, and (e) a second OR circuit for encoding the second type information. And (f) the NO
An output of an R circuit, an output of the inverter, and the second OR
A first AND that creates a logical product of the outputs of the circuits and outputs the logical product as a master-slave switching signal of the first storage device
And (g) a logical product of the output of the NOR circuit, the output of the flip-flop, and the output of the first OR circuit, and outputs as a master-slave switching signal of the second storage device. And an AND circuit.

[0012]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. Referring to FIG. 1, a master-slave automatic setting system according to the present invention includes a storage device 5
A storage device 6, a CPU 13, a bus 19 serving as an IDE interface connecting the CPU 13 with the storage device 5 and the storage device 6, and a master-slave automatic setting circuit 1 for setting a master-slave of the storage device 5 and the storage device 6.
6 and a backup memory 17 for storing information to be sent to the master-slave setting circuit 16.

FIG. 2 is a physical schematic block diagram of a computer to which the present invention is applied. Referring to FIG. 2, the computer 1 includes a master / slave setting circuit 16, a backup memory 17, a bus 19, and a CPU board 8 in which a CPU 13 is stored, a storage device 5, and a storage device 6.
And a connector 1 attached to the storage device 5 for connecting them.
1 and a connector 12 attached to the storage device 6.

FIG. 3 is a sketch of the computer 1. FIG. 4 is a sketch of the floppy disk drive. FIG. 5 is a sketch of the hard disk device. FIG. 6 is a sketch of a CD-ROM device.

Referring to FIG. 3, the computer 1 has a storage device 5 and an opening 5 in which the storage device 6 fits in the front, respectively.
a and an opening 5b. FIG.
Floppy disk device 2 shown in FIG. 5, IDE interface hard disk device 3 shown in FIG. 5, IDE shown in FIG.
A storage device such as the interface CD-ROM device 4 can be mounted.

FIG. 7 is a logical diagram for explaining the type information of the storage device. FIG. 8 is a logic diagram for determining the master and slave of each storage device. FIG. 7 shows a device attachment confirmation signal and device recognition bits, which are type information, and FIG. 8 shows a master-slave switching signal. Type information shown in FIG. 7 and the following is fixedly built into the connectors 11 and 12 of the storage devices 5 and 6. CTL0: Device installation confirmation signal ("0" when device is turned on)
PCL1: device identification bit 1 PCL2: device identification bit 2 PCL3: device identification bit 3 This type information is used as a signal in the master-slave setting circuit 1.
Sent to 6. The master / slave switching signals BAY0CSEL and BAY1CSEL in FIG. 8 are created by the master / slave automatic setting circuit 16 shown in FIG.

Next, the operation of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 9 is a flowchart showing a procedure for automatically setting the interface type information from the type information of the storage devices 5 and 6. FIG. 10 is a block diagram of the master-slave automatic setting circuit 16. Referring to FIG. 10, the master-slave automatic setting circuit 16 includes a NOR circuit 21, a flip-flop 22, and an inverter 23.
, Three-input AND circuits 25 and 26, and OR circuits 27 and 2
And 8.

First, the software is PCL2, PCL
3 is checked (S1 in FIG. 9), and if both PCL2 and PCL3 are "0", the storage device is recognized as a floppy disk device, and the CPU 13 indicates in the backup memory 17 that the backup memory 17 is a floppy disk device. The type information is stored (S2 in FIG. 9). In other cases, the interface type information indicating the IDE interface is stored (S3 in FIG. 9). next,
The software reads the above-described interface information from the backup memory 17, creates master-slave information based on the information, and stores the master-slave information in the backup memory 17. The master / slave information is output to the storage devices 5 and 6 as an MS signal. The MS signal is set in the flip-flop 22 when one clock of MSWRITE is output from the bus 19. The MSWRITE clock is output from software when the setting is changed or when the power is turned on.

When the master / slave setting is changed by software, the MS signal from the backup memory 17 is changed by software, the entire computer system is reset, and MSWRITE is set to 1
Clock output and setting can be changed.

The reason for resetting the entire computer system is that the initialization setting of the master / slave setting of the hard disk is performed when the power of the hard disk is turned on or at the time of initialization of the setting immediately after the hardware reset including the power-on. It is. At the time of initialization, the setting is changed by rereading the state of the logic of the jumper setting or the logic of the CSEL signal. Another reason is that, in a PCAT compatible machine as a computer system, a CMO that stores a parameter table of a hard disk is used.
When a setting change is made to a register called S,
This is because the specification requires reinitialization. Therefore, when the parameters of the master and the slave are different, the CMO
The value of S must be reset, and a system reset is required.

The output of the flip-flop 22 is inverted by the inverter 23 and enters the three-input AND 25. The output of the flip-flop 22 enters the three-input AND 25.

BAY0CTL0 from the storage device 5 indicates the device attachment confirmation signal CTL0 of the storage device 5, and BAY1CTL0 from the storage device 6 indicates the device attachment confirmation signal CTL0 of the storage device 6. BAY from storage device 5
0PCL2 indicates the device identification bit PCL2 of the storage device 5, and BAY0PCL3 indicates the device identification bit P of the storage device 5.
CL3 is shown. BAY1PCL2 from the storage device 6 indicates the device identification bit PCL2 of the storage device 6, and BAY1P
CL3 indicates the device identification bit PCL3 of the storage device 6.

When an IDE device is connected to only one side, the NOR circuit 21 always stores the CSEL of the storage device.
Is set to "0", set as a master, and operates as a circuit for use as a start-up device. AND circuit 27
And AND28 have a floppy disk on one side and an I
When a DE device is connected, the device operates as a circuit for always setting the IDE device as a master.

The three-input AND circuit 25 and the three-input A
From the ND circuit 26, BAY0CSEL and B
AY1CSEL is output. BAY0CSEL is a master-slave switching signal CSEL of the storage device 0,
AY1CSEL is a CSEL signal of the storage device 1, and each logic is "0" as a master and "1" as a slave.

Here, in an IDE interface device such as a hard disk or a CD-ROM, a master and a slave can be set on an interface instead of a master / slave setting by a jumper setting.
It is necessary to use an IDE interface signal specified by TA, ATA2, and ATA3 which can be set by a 28-pin CSEL.

[0026]

A first effect of the present invention is that the change of the master and the slave of the storage device can be flexibly and easily performed. The second effect is that the device can be started up from any of the storage devices while maintaining the specifications of the IDE interface, which is an existing technology.

The reason is that the setting and changing of the master / slave can be performed by software, and the setting by the switch of the storage device is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a physical schematic block diagram of a computer to which the present invention is applied.

FIG. 3 is a sketch of a computer.

FIG. 4 is a sketch of a floppy disk device.

FIG. 5 is a sketch of a hard disk device.

FIG. 6 is a sketch of a CD-ROM device.

FIG. 7 is a logical diagram illustrating type information of a storage device.

FIG. 8 is a logic diagram for determining a master and a slave of each storage device.

FIG. 9 is a flowchart illustrating a procedure for setting interface type information.

FIG. 10 is a block diagram of a master-slave automatic setting circuit.

[Explanation of symbols]

 Reference Signs List 1 computer 2 floppy disk device 3 hard disk device 4 CD-ROM device 5, 6 storage device 8 CPU board 11, 12 connector 13 CPU 16 master / slave automatic setting circuit 17 backup memory 19 bus 21 NOR circuit 22 flip-flop 23 inverter 25, 26 3-input AND circuit 27, 28 OR circuit

Claims (2)

[Claims] 1. A first storage device having a CPU, first type information indicating a type and first device attachment information indicating a presence, and a second device indicating a second type information indicating a type and a presence A second storage device having mounting information;
A backup memory in which master-slave information is stored in accordance with instructions from software executed by the PU, and the backup memory based on the first and second type information, the first and second device attachment information, and the master-slave information. A master-slave automatic setting circuit for determining a master and a slave of the first and second storage devices;
U, a bus for connecting the first and second storage devices, the backup memory, and the master / slave automatic setting circuit. 2. The master-slave automatic setting circuit,
(A) a NOR circuit that creates NOR logic between the first device attachment information and the second device attachment information;
(B) a flip-flop in which the master / slave information from the backup memory is set by a set signal from the bus; (c) an inverter for inverting the output of the flip-flop; and (d) the first type information. A first OR circuit that encodes
A second OR circuit for encoding the type information of
A first logical product of an output of the NOR circuit, an output of the inverter, and an output of the second OR circuit, which is output as a master-slave switching signal of the first storage device;
And (g) forming a logical product of the output of the NOR circuit, the output of the flip-flop, and the output of the first OR circuit, and outputting the logical product as a master-slave switching signal of the second storage device. The master / slave automatic setting system according to claim 1, further comprising two AND circuits.