JPS58203553A - Method for discriminating allowable storage data in data area - Google Patents

Abstract

PURPOSE:To check simply the tolerance of a storage area, by inputting an input data value to a shift register, shifting the value to the lower-order and discriminating whether storing is available or not by the existence of ''1'' in the register after shifting the value. CONSTITUTION:Data inputted to a register 1 are transferred to a shift register 2 and a register 5. A setting part 4 connected to the register 2 sets up the number (n) of bits in a data area register 7, shifts the contents of the register 2 by n bits in the lower-order bit direction and turns the empty bits in the upper-order bits which are generated in accordance with the shifting operation to ''0''. A discrimination circuit part 3 discriminates whether the register 2 includes ''1'' after shifting or not, and when there is no ''1'', opens a gate circuit 6 and stores the input data value stored in the register 5 into the register 7. When the circuit part 3 discriminates the existence of ''1'' once at least, the input data value is returned to the input data side regarding that the storage of the value in the register 7 is impossible.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a method for determining allowable storage data in a data area, which determines whether an input data value is stored in a data area with a required bit configuration. be.

(To) Prior art and problems Conventionally, when input data input as numerical values is input into a data area consisting of bits, a table showing numerical values for bits is used to convert the numerical value into the number of bits or A method is used in which the number of bits is converted into a numerical value, the operation vi is performed, and the result of the operation is compared with the input number uLtl to determine whether input data, that is, a number, can be input to the data area. The composer has to create and store tables (therefore also requires built-in memory), and the latter has to perform calculations, so in any case, there is a problem that these processes are not simple.

(C) Object of the Invention It is an object of the present invention to provide a method for determining the permissible data stored in a data area, which can easily check the permissibility of the storage area from the conventional situation as described below. .

1) Structure of the Invention Briefly stated, this invention manually inputs the number of bits constituting the data area into the input category iii shift register, shifts the number ijI in the register in the lower direction, and sets the number of bits constituting the data area in the lower direction. It is characterized in that the bit is set to 10', and whether or not it can be stored is determined based on the presence or absence of ``2'' in the contents of the register after shifting.

(e) Embodiment of the Invention The figure is a block diagram showing an embodiment of a method for determining permissible storage data in a data area to which the present invention is applied.
i register, 2 is a shift register, 3 is a judgment circuit section, 4
6 indicates a setting section, 6 indicates a data 1 circuit section, and 7 indicates a data area register. The input data value is input into register l. The right side of the figure shows the lower rank, and the left side shows the higher rank. The input data value stored in register 1 is T1
When determining whether data can be stored in the data area register 7 consisting of a bit configuration, the contents of the register l are transferred to the t-shift register 2 and the register 5. A setting section 4 is attached to the shift register 2, and this setting section 4 is set with the number of bits n of the data area register 7, and the setting ordinance is used to convert the contents of the shift register 2 into lower bits. At the same time, the empty bit of the upper bit of shift register 2 that occurs in response to the shift is moved to lO
' and -r operation. The determination circuit unit 3 determines whether or not 11 exists in the shift register 2 after being shifted, and if there is no 1 bit, it notifies the gate circuit 6 to that effect and sends the gate circuit unit 6 a 1' message. Then, the input data value stored in register b is stored in data area register 7. When the determination circuit section 8 determines the presence of at least one 11, it sends back to the input data side, indicating that the input data value cannot be stored in the Daly data entry register 7.

(1. Effects of the Invention) According to this invention, it is possible to easily determine the input data that is allowed in the storage area without using tables or calculations, which is a great advantage in processing input data. Become.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a method for determining permissible storage data in a data area applied to the first invention. In the figure, l and 5 are registers, 2 is a shift register,
Reference numeral 8 indicates a determination circuit section, and reference numeral 7 indicates a data area register. Hecate

Claims (1)

[Claims] A method for determining whether or not the input data value is allowed to be stored in the data area when the input data value is input into a data area having a set n-bit configuration, the method comprising: inputting the input data value into a shift register. Input L l1il
The input data is shifted in the lower bit direction by n bits, and the vacant bit resulting from the shift is set to 10', and the presence or absence of 11 in the shift register after the shift is determined to determine whether or not the input data can be stored. A method for determining permissible storage data in a data area, characterized by: