JPH06195177A - Integrated circuit, magnetic disk device using the same and control method for magnetic disk device - Google Patents

Abstract

PURPOSE:To improve efficiency by advancing processing as much as possible at one port while processing is performed at the other port by a read/write circuit on the side of a magnetic disk at the magnetic disk device equipped with two ports at an interface. CONSTITUTION:A magnetic disk device 301 is provided with circuits A306 and B307 composed of the integrated circuit equipped with a dedicated interface control circuit and a disk formatter circuit for ports A304 and B305, and dedicated data buffers A308 and B309. The circuits A306 and B307 are provided with a try state mode for exchanging data with a magnetic disk side read/write circuit 312 as needed. The respective ports occupy a read/write circuit 312 only during transfer between this read/write circuit and the data buffer but do not use the read/write circuit 312 during transfer between the host side and the data buffer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated circuit incorporating an interface control circuit of a magnetic disk device and a magnetic disk formatter, a magnetic disk device having two dual ports for an interface using the integrated circuit, and The present invention relates to a method of controlling the magnetic disk device.

[0002]

2. Description of the Related Art Conventionally, in a magnetic disk device having two dual ports for an interface, two integrated circuits each having a dual interface control circuit and a magnetic disk formatter circuit, and a read / write operation are provided. It had one common data buffer for temporarily holding data inside. Either a selector circuit was used in the connection between the data buffer from these two integrated circuits and the circuit for reading and writing the magnetic disk, or these two integrated circuits read and write the magnetic disk to the data buffer. It was supposed to tri-state the connection to the circuit at the same time.

When there is a selection request from the host to one of the ports, it responds to the requested port and incorporates a dual interface control circuit and a magnetic disk formatter circuit connected to that port. The integrated circuit becomes active, the integrated circuit occupies the data buffer and the read / write circuit of the magnetic disk to perform the read / write operation, and the data transfer between the host and the read / write circuit of the magnetic disk device side is performed. Through the buffer, during that time, it rejected requests to select other ports.

[0004]

In the conventional magnetic disk device having two dual ports in the interface, when one port receives a selection request from the host,
The requesting port responds to the request, and the integrated circuit containing the dual interface control circuit and disk formatter circuit connected to that port becomes active, and the integrated circuit becomes the data buffer. Since it occupies the read / write circuit of the magnetic disk and refuses the selection request to other ports, it has a drawback that only one port can always be used even if it has two ports.

An integrated circuit incorporating a conventional interface control circuit and a magnetic disk formatter circuit simultaneously tri-states the connection to the data buffer and the circuit for reading and writing the magnetic disk. Therefore, there is a drawback that it is not possible to have a dedicated data buffer for each port.

[0006]

A first aspect of the present invention is an integrated circuit having an interface control circuit of a magnetic disk device and a magnetic disk formatter, which is a tri-state circuit for performing input / output to / from a data buffer. A first driver / receiver having a mode and a tri-input / output for the read / write circuit of the magnetic disk.
A second driver / receiver having a state mode, an internal control circuit for controlling the operation of an internal circuit, and the first and second drivers / receivers are individually tri-stated by setting of the internal control circuit. It has the function to do.

A second aspect of the present invention is a magnetic disk device having two dual ports in an interface, wherein data is transferred through the two integrated circuits and the read / write circuit of the magnetic disk during operation of the ports. Both of the dual ports have a commonly used data buffer for temporarily storing data.

A third aspect of the present invention is a magnetic disk device having two dual ports in an interface, which is used when data is transferred through the two integrated circuits and the read / write circuit during the operation of the ports. Dedicated to both dual ports to store data temporarily 2
And one data buffer.

A fourth aspect of the present invention is a method of controlling a magnetic disk device according to the second aspect of the present invention, wherein a queue for inputting processing requested by a host, a data buffer and a read / write circuit are in use. A first step of determining whether there is any, a second step of inputting the process requesting the host server into the queue, and a third step of determining whether the process is in the queue. And steps.

A fifth aspect of the present invention is a magnetic disk drive control method according to the third aspect of the present invention, which comprises a fourth step of determining whether the process requested by the host is a write process or a read process. The fifth step of receiving the data from the host into the data buffer without occupying the read / write circuit on the magnetic disk side during the write processing, and the read on the magnetic disk side during the execution of the read processing A sixth step of determining whether or not the data transfer is completed between the writing circuit and the data buffer,
A seventh step of ending the occupation of the read / write circuit on the magnetic disk side when the data transfer is completed, and a data transfer process between the read / write circuit on the magnetic disk side and the data buffer. An eighth step of determining whether or not the input queue and the read / write circuit on the magnetic disk side are in use;
A ninth step of inputting a data transfer process between the read / write circuit on the magnetic disk side and the data buffer to a queue, and a step of judging whether the process is in the queue or not. And 10 steps.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an integrated circuit of the present invention. In FIG. 1, 101 is an integrated circuit which incorporates the interface control circuit and the disk formatter circuit of the present invention. A data buffer control circuit 106 controls data input / output with the data buffer. Reference numeral 102 is a data buffer driver / receiver for performing input / output to / from the data buffer control circuit 106 and an external data buffer. 107
Is a magnetic disk formatter circuit. 103
Is a magnetic disk side driver / receiver for inputting / outputting data to / from the data buffer control circuit 106 and a circuit for reading / writing external magnetic disks. 108 is
It is an internal control circuit that controls the operation of the internal circuit according to the settings and instructions of the external control circuit. Reference numeral 104 denotes an external control circuit driver / receiver for performing input / output to / from the internal control circuit 108 and an external interface control circuit. An interface control circuit 109 performs interface processing with the host. Reference numeral 105 denotes an interface driver / receiver for performing input / output to / from the interface control circuit 109 and the host. Then, the data buffer driver / receiver 102 and the magnetic disk side driver / receiver 103 are individually set to try by the setting of the external interface processing circuit.
Become a state.

The integrated circuit 101 has a data buffer driver / receiver 102 as an input / output signal with the outside.
A data buffer side data signal / control signal 110 is connected to the magnetic disk side driver / receiver 103, and a magnetic disk side read / write data signal / control signal 111 is connected to the magnetic disk side driver / receiver 103. Also, the external control circuit driver / receiver 1
An interface control circuit side data signal / control signal 112 is connected to 04, and an interface driver /
The interface side data signal / control signal 113 is connected to the receiver 105.

FIG. 2 is a block diagram showing an embodiment of the magnetic disk device of the present invention. In FIG. 2, 201 is a magnetic disk device having two dual ports in the interface of the present invention. This magnetic disk device 201
The port A side and the port B side share a common data buffer 208 for temporarily storing data during a read / write operation. 202 is an interface cable A for port A 204. 203 is an interface cable B for the port B205.
Reference numeral 206 denotes an integrated circuit A in which the interface control circuit of the present invention for the port A 204 and the magnetic disk formatter circuit are incorporated, and is an interface disk formatter circuit A (hereinafter referred to as circuit A). Reference numeral 207 denotes an integrated circuit B incorporating the interface control circuit of the present invention for the port B 205 and the magnetic disk formatter circuit,
It is a disk formatter circuit B (hereinafter referred to as circuit B). An interface processing circuit 209 sets and gives instructions for the operations of the circuit A 206 and the circuit B 207 and interprets and executes an instruction from the host. 210 is
This is a drive-side control circuit that performs seek operation of the magnetic disk enclosure 202. A read / write circuit 211 is connected to the circuit A 206 and the circuit B 207,
Reading and writing is performed on the magnetic disk enclosure 212 by a control signal from the circuit A 206 or the circuit B 207.

4 and 5 are flow charts showing the control procedure of the interface processing circuit 209 in the magnetic disk device 201 of FIG.

First, in step S401, it is determined whether or not the circuit A206 is currently being processed. If it is currently being processed, the process proceeds to step S407. If it is not currently being processed in S401, the process proceeds to S402, it is determined whether or not the process for the circuit A206 is in the queue, and if the process is in the queue, the process proceeds to S409. If the process is not in the queue in S402, the process proceeds to S403, the circuit A206 is checked to determine whether the host requests the process from the port A204 to the circuit A206, and if the process is not requested. Go to S412. If the processing is requested in S403, the process proceeds to S404, it is determined whether the data buffer 208 and the read / write circuit 211 on the magnetic disk side are currently in use, and if they are in use, the process proceeds to S411. Then, in S411, the current process is put in a queue and S412 is entered.
Go to If it is not in use in S404, the process proceeds to S405, and the circuit A 206 uses the data buffer 208 and the read / write circuit 211.

Next, the processing proceeds to S406, the processing received from the host in S403 is started, and the processing proceeds to S412. Then, in S407, it is determined whether or not the current processing is finished,
If not, go to S403. If the processing ends in S407, the processing proceeds to S408, the data buffer 208 and the reading / writing circuit 211 used by the circuit A 206 are released, and the processing proceeds to S412. In step S409, it is determined whether the data buffer 208 and the read / write circuit 211 are currently in use. If they are currently in use, the process proceeds to step S403. If it is not in use in S409, the process proceeds to S410, one is taken out from the processing queue for the circuit A206, and the process proceeds to S405.
Then, in step S405, the circuit A 206 causes the data buffer 2
08 and the read / write circuit 211 are used.

Next, the processing proceeds to S406, the processing taken out from the queue in S410 is started, and the processing proceeds to S412. S4
In step 12, it is determined whether or not the circuit B 207 is currently being processed. If it is currently being processed, the process proceeds to step S418. If it is not currently being processed in S412, go to S413,
It is determined whether the process for the circuit B207 is in the queue, and if the process is in the queue, the process goes to 420. If the process is not in the queue in S413, S414
The host goes to port B205 for circuit B207.
Determines whether or not processing is requested by checking the circuit B207, and if processing is not requested, the process proceeds to S401. If processing is requested in S414, go to S415,
It is determined whether or not the data buffer 208 and the read / write circuit 211 are currently in use, and if they are currently in use, S422.
Go to Then, in S422, the current process is put in a queue and the process goes to S401. If it is not in use in S415, the process proceeds to S1416, and the circuit B 207 uses the data buffer 208 and the read / write circuit 211.

Next, the processing proceeds to S417, the processing received from the host in S414 is started, and the processing proceeds to S401. Then, in S418, it is determined whether or not the current processing is finished,
If not, go to S414. If S418 has ended, the process proceeds to S419, the data buffer 208 and the read / write circuit 211 used by the circuit B207 are released, and the process proceeds to S401. In S420, it is determined whether the data buffer 208 and the read / write circuit 211 are currently in use, and if they are in use, the process proceeds to S414. If it is not in use in S420, the process proceeds to S421, one process for the circuit B207 is taken out from the queue, and the process proceeds to S416. Then, in step S416, the circuit B 207 uses the data buffer 208 and the read / write circuit 211. Next, the processing proceeds to S417, the processing taken out from the queue in S421 is started, and the processing proceeds to S401. In this way, the sequential processing is performed.

FIG. 3 is a block diagram showing another embodiment of the magnetic disk device of the present invention. In FIG. 3, reference numeral 301 is a magnetic disk device having two dual ports in the interface of the present invention. This magnetic disk device 30
In No. 1, the port A side and the port B side respectively have data buffers for temporarily storing data during the read / write operation. The data buffer 308 is dedicated to port A and the data buffer 309 is dedicated to port B. 302 is the interface cable A for the port A 304. 303 is an interface cable B for the port B 305. 306 is a circuit A for the port A 304. 307 is a circuit B for the port B 305. An interface processing circuit 310 sets and gives instructions for the operations of the circuit A 306 and the circuit B 307, interprets and executes an instruction from the host. A drive-side control circuit 311 performs a seek operation of the magnetic disk enclosure 313. A read / write circuit 312 is connected to the circuit A 306 and the circuit B 307, and is connected to the circuit A 306 or the circuit B.
Reading and writing is performed on the magnetic disk enclosure 313 by the control signal of 307.

6 to 9 show the magnetic disk device 3 of FIG.
6 is a flowchart showing a control procedure of an interface processing circuit 310 in 01.

First, in S501, it is determined whether or not the circuit A 306 is currently being processed, and if it is currently being processed, the process proceeds to S506. If it is not currently being processed in S501, the process proceeds to S502 to determine whether the process for the circuit A306 is in the queue, and if the process is in the queue, the process proceeds to S504. If the process is not in the queue in S502, the process proceeds to S503, and the circuit A306 is checked to determine whether the host requests the process from the port A304 to the circuit A306. If the process is not requested, the process proceeds to S521. Go to If processing is requested in S503, the process proceeds to S511. In S504, it is determined whether or not the read / write circuit 312 on the magnetic disk side is currently in use, and if it is in use, the process proceeds to S521. If it is not in use in S504, the process proceeds to S505, one process for the circuit A306 is taken out from the queue, and the process proceeds to S511.

Next, in S506, it is determined whether or not the current process is completed, and if it is not completed, the process proceeds to S503. If it is finished in S506, go to S507 to see the circuit A.
It is determined whether the read / write circuit 312 used by 306 is being used, and if not, the process proceeds to S509. Then, if used in S507, the process proceeds to S508, the read / write circuit 312 used by the circuit A306 is released, and the process proceeds to S509. In step S509, it is determined whether the circuit A 306 is in the process of reading. In the determination as to whether or not this read processing is in progress, actually, the data from the magnetic disk enclosure 313 has already been read into the data buffer A308, and there is data in the data buffer A308 to be transferred to the host through the circuit A306. It is a determination of whether or not. If it is not being processed in S509, the process proceeds to S521. If processing is being performed in S509, S5 is executed.
Go to 10 and start the process of transferring the contents of data buffer A 308 to the host, if not already started, and if it has already been started, continue here.

Then, the process goes to S521. And S51
In step 1, a determination is made by checking the contents of the process received from the host in S503 or the process extracted from the queue in S505. If the content of the process is writing in S511, the process proceeds to S512. Then, in S512, it is determined whether or not all the data to be received from the host has been received,
If already received, go to S514. Also, S51
If it has not been received in step 2, the process proceeds to step S513. If the process of receiving data from the host to the data buffer A 308 has not started yet, it starts here, and if it has already started, it continues here. After that, S5
14, it is determined whether the read / write circuit 312 is currently in use, and if it is in use, the process proceeds to S520. In addition, S514
If it is not in use, the process proceeds to S515, and the circuit A 306 is made to use the read / write circuit 312.

Next, in S516, the contents of the data buffer A 308 are controlled by controlling the read / write circuit 312 to start the process of writing in the magnetic disk enclosure 313. Then, it goes to S521. And S5
If the processing content is read in 11, the process proceeds to S517. S
At 517, it is determined whether the read / write circuit 312 is currently in use, and if it is in use, the process proceeds to S520. If it is not in use in S517, the process proceeds to S518, and the circuit A306 uses the read / write circuit 312. Then, S519
Then, by going to the data buffer A 308 and controlling the data reading / writing circuit 312, the reading process is started from S 313. Then, it goes to S521. S520
Then, the current processing is queued and the process goes to S521.

In step S521, it is determined whether or not the circuit B307 is currently being processed. If the circuit B307 is currently being processed, step S5 is performed.
Go to 26. If it is not currently being processed in S521, S
In step 522, it is determined whether or not the process for the circuit B307 is in the queue. If the process is in the queue, the process proceeds to step S524. If the process is not in the queue in S522, the process goes to S523 to check whether the host requests the process from the port B305 to the circuit B307.
307 is checked to make a determination, and if processing is not requested, S5
Go to 01. If processing is requested in S523, S
Go to 531. In S524, it is determined whether the read / write circuit 312 is currently in use, and if it is in use, the process proceeds to S501. If it is not used in S524, the process proceeds to S525, one process for the circuit B307 is taken out from the queue, and the process proceeds to S531.

Next, in S526, it is determined whether or not the current processing is completed, and if it is not completed, the flow proceeds to S523. If it is finished in S526, go to S527 and the circuit B
It is determined whether the read / write circuit 312 used by 307 is being used, and if not, the process proceeds to S529. Then, if it is used in S527, the process proceeds to S528, the read / write circuit 312 used by the circuit B307 is released, and the process proceeds to S529. In step S529, it is determined whether the circuit B307 is in the process of reading. In the determination as to whether or not this read processing is in progress, the data from the magnetic disk enclosure 313 has actually been read into the data buffer B309, and there is data to be transferred to the host through the circuit B307 in the data buffer B309. It is a determination of whether or not. If it is not being processed in S529, the process proceeds to S501. If processing is being performed in S529, S5 is executed.
Go to 30 and start the process of transferring the contents of data buffer B 309 to the host if it has not already started, and if it has already started, continue here. After that, go to S501. Then, in S531,
The process received from the host in S523, or S5
In step 25, the contents of the process taken out of the queue are checked to make a determination. If the content of the process is writing in S531, S5
Go to 32. Then, in S532, it is determined whether or not all the data to be received from the host has been received, and if already received, the process proceeds to S534. If it has not been received in S532, the process proceeds to S523. If the process of receiving data from the host to the data buffer B309 has not started yet, it starts here, and if it has already started, it continues here. . After that, the process proceeds to S534, it is determined whether the read / write circuit 312 is currently in use,
If it is in use, go to S540. If it is not in use in S534, the process goes to S535, and the circuit B307 uses the read / write circuit 312.

Next, in S536, the contents of the data buffer B309 are controlled by the read / write circuit 312 to start the process of writing in the magnetic disk enclosure 313. After that, go to S501. And S5
If the content of the process is read at 31, the process proceeds to S537. S
At 537, it is determined whether the read / write circuit 312 is currently in use, and if it is in use, the process proceeds to S540. If S537 is not in use, the process goes to S538, and the circuit B307 uses the read / write circuit 312. Then, S539
Then, the process of reading data from the data buffer B 309 is controlled by the read / write circuit 312 to start the process of reading from S 313. After that, go to S501. And
In S540, the current process is put in a queue and S501
Go to

[0029]

As described above, the integrated circuit including the interface control circuit and the disk formatter circuit according to the present invention has a control circuit for controlling data input / output to / from a data buffer and an external data circuit. The magnetic disk formatter has a driver / receiver for input / output to / from the buffer, and the magnetic disk formatter includes a driver / receiver for input / output to / from a magnetic disk formatter circuit and an external magnetic disk read / write circuit. In the magnetic disk device with two dual I / O ports, both ports are used for temporarily inputting data during read / write operations by setting each external interface processing circuit to be in tri-state independently. On the other hand, in the magnetic disk unit that has a common data buffer, There is an effect that it can be used by occupying the circuit of the data buffer and the magnetic Disugu side port side of the integrated circuit that are forwarding strike and data.

In a magnetic disk device having two dual I / O ports, each port has its own data buffer for temporarily storing data during read / write operations. There is an effect that only the circuit on the magnetic disk side is occupied by the integrated circuit on the port side for transfer and each data buffer can be used by always connecting to the integrated circuit.

Further, the magnetic disk device having two dual input / output ports of the present invention and having a common data buffer for both ports for temporarily storing data during a read / write operation is processed by the host. If the data buffer and the circuit on the magnetic disk side are being used for other ports when requesting a request, the processing is queued, and the data buffer and the circuit on the magnetic disk side are later queued. By running when is available
The effect is that the host does not have to keep issuing processing requests when the port it is trying to use cannot currently perform processing.

Further, in the magnetic disk device having two dual I / O ports of the present invention, each port having its own data buffer for temporarily storing data during read / write operations, the host processes the data. If the host is writing data to the magnetic disk drive while checking the contents of the request while it is making a request, the process of receiving the data from the host to the data buffer is performed, and then the magnetic disk side circuit performs other processing. By checking whether or not the port is used for the port, it is possible to transfer data in advance in the case of write processing even if another port is using the magnetic disk side. If the host is reading data from the magnetic disk device by checking the contents of the processing while requesting the processing, the magnetic data is read. Disk port is occupied only when data is being transferred from the disk side to the data buffer, and when data is being transferred from the data buffer to the host, another port uses the magnetic disk side. Therefore, there is an effect that efficiency is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an integrated circuit incorporating an interface control circuit and a magnetic disk formatter circuit according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a flowchart showing a processing procedure of an interface processing circuit 209 in the embodiment of FIG.

5 is a flow chart for connecting to the connector of the flow chart of FIG.

FIG. 6 is a flowchart showing a processing procedure of an interface processing circuit 310 in the embodiment of FIG.

7 is a flow chart for connecting to the connector of the flow chart of FIG.

FIG. 8 is a flow chart for connecting to the connector of the flow chart of FIG.

9 is a flow chart for connecting to the connector of the flow chart of FIG.

[Explanation of symbols]

101 integrated circuit 102 data buffer driver / receiver 103 magnetic disk side driver / receiver 104 external control circuit driver / receiver 105 interface driver / receiver 106 data buffer control circuit 107 magnetic disk formatter 108 internal control circuit 109 interface control circuit 110 data Buffer side data signal / control signal 111 Magnetic disk side read / write data signal / control signal 112 Interface control circuit side data signal / control signal 113 Interface side data signal / control signal 201,301 Magnetic disk device 202,302 Interface table A 203,303 Interface table B 204,304 Port A 205,305 Port B 206,306 Interface disk Kuformatter circuit A 207,307 Interface disk formatter circuit B 208 Data buffer 209,310 Interface processing circuit 210,311 Drive side control circuit 211,312 Read / write circuit 212,313 Magnetic disk enclosure 308 Data buffer A 309 Data Buffer B

Claims (5)

[Claims] 1. An integrated circuit incorporating an interface control circuit of a magnetic disk device and a magnetic disk formatter, the first driver having a tri-state mode for performing input / output to / from a data buffer.
Second receiver having a tri-state mode for inputting / outputting to / from a magnetic disk read / write circuit
Driver / receiver, an internal control circuit for controlling the operation of the internal circuit, and the first control circuit according to the setting of the internal control circuit.
And a function to individually tri-state the second driver / receiver, respectively. 2. A magnetic disk device having two dual ports in the interface, wherein data is read via the integrated circuit according to claim 1 and the read / write circuit of the magnetic disk via the port during operation. And a data buffer commonly used by both of the dual ports for temporarily storing data during transfer. 3. A magnetic disk device having two dual ports in an interface, wherein the two integrated circuits according to claim 1 and the read / write circuit are operating while data is being transferred through the ports. And both of the dual ports include two data buffers, which are used exclusively for temporarily storing data, respectively. 4. A method for controlling a magnetic disk device according to claim 2, wherein a queue for inputting processing requested by the host, a data buffer and a read / write circuit are in use. A second step of inputting the process requesting the host server into the queue, and a third step of determining whether the process is in the queue. A method for controlling a magnetic disk device, comprising: 5. The magnetic disk drive control method according to claim 3, wherein a fourth step of determining whether the process requested by the host is a write process or a read process; Sometimes the fifth step of receiving the data from the host into the data buffer without occupying the read / write circuit on the magnetic disk side and the read / write on the magnetic disk side during the execution of the read processing
A sixth step of determining whether or not the data transfer between the write circuit and the data buffer is completed; and a step of terminating the occupation of the read / write circuit on the magnetic disk side when the data transfer is completed. 7, the queue for inputting data transfer processing between the read / write circuit on the magnetic disk side and the data buffer and the read / write circuit on the magnetic disk side are in use. An eighth step of determining whether or not there is input, a ninth step of inputting a data transfer process between the read / write circuit on the magnetic disk side and the data buffer into a queue, and the process including the queue And a tenth step of determining whether or not it is inside the magnetic disk drive.