JPS6356730A - Register file - Google Patents

Abstract

PURPOSE:To read characters, one by one, and to improve an arithmetic speed by adding a read means which reads out words specified with a word address and a character address in specified character units. CONSTITUTION:Words 0-3 held in a data latch 1 are inputted to selectors 2 and 3. The selector 2 selects one of the words according to the word address and outputs arithmetic data in word units. The selector 3, on the other hand, outputs one of the words according to the word address and inputs it to selectors 6 and 7. The selector 6 selects four 8-bit characters and the selector 7 selects eight 4-bit characters. The selector 8 selects one of the characters and outputs it as arithmetic data, character by character. The selectors 6, 7, and 8 are controlled with signals indicating a character type as a character address and the in-word position of the character.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a register file, and particularly to a register file for storing data used in operations such as operand data in an information processing device.
- Concerning register files suitable for use in storing time.

BACKGROUND TECHNOLOGY Generally, in an information processing device, data to be used in an operation, such as operand data or data in the middle of an operation, is stored in multiple words.
A register file is often used as a temporary storage unit for storing time. In such an information processing apparatus, when an operation is performed in units of words, the data is written and read out in units of words in a temporary storage section using a register file (1).

On the other hand, there are cases where performance 0 is performed on the character
In such a case, in a conventional information processing device, a word containing a character to be operated on is first read out from a register file which is a time storage section, and then the word containing the character to be computed is stored in the arithmetic section of the information processing device. 1. Use the shifter to take out only the character targeted by the oil barrel. controlled. For example, first, use a left logical shift to shift the character to be operated on to the left end of the word, then use a right logical shift to shift the target character to the right end of the word. A common operation is to ensure that all bits in the pond are rOJ.

Therefore, as mentioned above, complex operations are required to extract character-by-character data for use in character-by-character calculations from the calculation data stored in word units in the register file, which serves as a time memory. The disadvantage is that the presentation time is longer.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a register file that allows not only word-by-word reading but also character-by-character reading to improve performance speed.

Structure of the Invention According to the present invention, there is provided a register file for storing word data consisting of a plurality of bits, which includes a first reading means for reading in word units according to an externally given word address; A register file is obtained in which the register file is connected to the second reading means for reading out specified character units among the characters constituting the word specified by the character address as well as the word address.

Factory example Next, the present invention will be explained with reference to the drawings.

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

The data latch 1 is a latch that holds data in a register file, and in this embodiment is composed of latches for 32 bits x 4 words, but is not limited thereto. Here, the circuit related to damage to the data latch 1 is omitted since it is not directly related to the present invention.

Data I! 1lioi to 104 are word O, word 1 . Word 2. This is a data line that outputs each word 3, and is connected to selector 2 and selector 3. The selector 2 selects one of the words according to the control signal of the control a line 106 which is obtained by decoding the word address received from the control line 105 by the decoder 4, and outputs the operation p data in units of words from the data line 107.

Similar to selector 2, selector 3 receives υl ta by decoding the word address received from control line 108 using decoder 5.
One of the words is output from the selection data line 110 according to the control signal of the ll line 109, and the selector 6 and the selector 7
Enter. This is used for reading arithmetic data in character units. Selector 6 is a selector that selects four 8-bit characters of the word received from data line 110, and selector 7 is a selector that similarly selects eight 4-bit characters of the word received from data line 110.

The selector 8 transfers the characters selected by the selectors 6 and 7 to data lines 111 and 1, respectively.
12, one of these is selected and outputted from a data line 113 as character-by-character character data. Therefore, in this embodiment, a signal indicating the character type and a signal indicating the position within the word of the character are received from the control@i 114 as a character address, and the decoder 9 decodes the signals and sends them to the control lines 115 to 117.
control the selectors 6, 7, and 8, respectively.

Next, in order to explain the operation of the present invention and its effects, a simple information processing apparatus including this embodiment will be taken as an example.

FIG. 2 is a block diagram thereof. In fig.

Register 10 and register 11 are registers that hold data to be operated on by ALU 12 which performs logical operation and shifter 13 which performs shift oil cylinder. Register 14 is AL
This is a register that selects and stores the calculation result of either U12 or shifter 13.

Further, the registers 10 and 11 select and store data from the outside via the data line 119, data from the register 14, word unit data or medium character data from the register file 15 of this embodiment. . The selector 16 provided at the input of the register file 15 is a selector for selecting external data or data in the register 14 and storing it in the register file 15.

In the information processing apparatus shown in FIG. 2, when performing a character-by-character operation, first operand data to be operated on is sent from the outside through the data line 119 and stored in the register file 15. Next, from the register file 15, the two operand characters to be operated on are sequentially data I! ,! 113, and stored in register 10 and register 11, respectively, and arithmetic operations are performed.

Here, considering the case of a conventional information processing device, the operation of extracting two operand characters to be operated on from operand data stored in a register file is performed using the method described in the conventional technology. The calculation cannot be performed until later. However, by using the above-described configuration according to the present invention, operand characters can be easily read out by externally specified addresses, and performance->processing can be speeded up.

As described in detail of the invention, according to the register file of the present invention, the key i? By adding the easy-to-use readout circuit, when used as temporary storage for operand data or data in the middle of an operation in an information processing device, there is an effect that the operation Q execution time of character-based operations can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an information processing apparatus using a register file according to the embodiment of the present invention. Explanation of symbols of main parts 1... Data Rudge

Claims (1)

[Claims] A register file that stores word data consisting of multiple bits, and includes a first reading means for reading in word units using an externally given word address, and a character address specified by the externally given word address. second reading means for reading specified character units among the characters constituting the word.