JP3175167B2 - Input/Output Processor - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THEINVENTION The present invention relates to an input/output processing device for operating an electronic disk device with high performance.

[0002]

2. Description of the Related Art Conventionally, this type of input/output processor fetches a channel program from a specified area of the main memory when started by the arithmetic processor, and sends the commands of the channel program sequentially to a peripheral controller via an input/output interface. In addition, various peripheral controllers are connected to the input/output processor, and the commands of the channel program depend on the peripheral controller, so the input/output processor does not directly operate these commands.

[0003]

Among the peripheral control devices connected to an input/output processing device, electronic disk devices, which require particularly high performance, execute channel programs executed by magnetic disk devices in order to maintain software compatibility with magnetic disk devices. However, the instruction sequence of the channel program contains unnecessary or redundant instructions for the electronic disk device.

However, in order to generalize its operation, the conventional input/output processing devices described above do not manipulate the instructions of the channel program, which results in the exchange of unnecessary and redundant instructions for the electronic disk device, which becomes an obstacle to improving performance.

[0005]

The input/output processing device of the present invention is a device that controls a main memory and a peripheral control device by being activated by an arithmetic processing device .
An input/output processing unit that controls input/output processing between the control device and the
An instruction fetch circuit fetches a channel program from a main memory device, and a part of an instruction sequence in the channel program is fetched.
The device is characterized by comprising a microprogram including a deletion function , a command sending circuit for sending the command sequence after deletion to a peripheral control device, and a processor circuit for controlling the operation of the device in accordance with the microprogram.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, reference numeral 1 denotes the entire input/output processing device, and reference numeral 2 denotes an instruction fetch circuit which is connected to a main memory device via an interface 11. The output of the instruction fetch circuit 2 is connected to a processor 4, which is connected to a control storage 5 in which microprograms are loaded.

The output of the processor 4 is connected to the command output circuit 3, the output of which is connected to a peripheral control device via an input/output interface 15.

Next, the operation will be described.

Let us now assume that an electronic disk drive is connected to a peripheral control device. The electronic disk drive generally executes the same channel program as the magnetic disk drive to maintain software compatibility. As a representative example, let us assume that the electronic disk drive executes the following command sequence:

(1) File mask setting command (2) Seek command (3) Sector setting command (4) Search command (5) Read command Conventionally, the above commands are taken in by a command taking circuit from the main memory device and sent out one command at a time via a command sending circuit in response to a request from the electronic disk device.

In the above sequence of commands, the file mask setting command sets write protection for the magnetic disk device, and the sector setting command deletes the rotational latency when a search command is executed, and is not necessary for an electronic disk device. Therefore, each command taken from the command take-in circuit 2 to the processor 4 is analyzed by a microprogram, and the relevant command is deleted and skipped, and only the seek command, search command, and read command are sent in that order.

Next, another embodiment of the present invention will be described.

In the above command sequence, the electronic disk device has the seek command data, the cylinder and head number, and the search argument data, which is the search command data.
That is, the memory address of the own device is generated from the cylinder, head, and record number.

In this embodiment, in order to maximize the access performance of the electronic disk device, the microprogram loaded in the control storage deletes the file mask setting command and sector setting command described above, and converts the seek command and search command into one command and sends it out as an address setting command.

Furthermore, the commands may be converted by converting a seek command, a search command, and a read command into one command, and processing the entire command sequence with the one command as a read command having an address setting function.

[0017]

As explained above, the present invention has a microprogram that has the function of deleting commands unnecessary for the electronic disk device from the command sequence of a channel program or converting a plurality of commands into fewer commands, thereby making it possible to greatly improve the access performance of the electronic disk device.

[Brief description of the drawings]

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

[Explanation of symbols]

Reference Signs List 1 Input/Output Processing Device 2 Instruction Capture Circuit 3 Instruction Output Circuit 4 Processor 5 Control Storage

Claims (1)

(57) [Claims] 1. An input/output processing device that controls input/output processing between a main memory device and a peripheral control device when started by an arithmetic processing device, comprising: an instruction fetch circuit that fetches a channel program from the main memory device; and a microprogram that includes a function for deleting a part of an instruction sequence in the channel program.
1. An input/output processing device comprising: a command sending circuit for sending the deleted command sequence to a peripheral control device; and a processor circuit for controlling the operation of the device in accordance with the microprogram.