JPS5880740A - Microprogram controller - Google Patents

Abstract

PURPOSE:To realize an effective data transfer process during a stack operation, by adding a register selecting counter to a control part and therefore using all registers for the stack operation to attain both a pop operation and a push operation with an instruction. CONSTITUTION:A microprogram controller is provided with a control part 1, register part 2 and arithmetic part 3. The control part 1 includes a microprogram storage part 10, microprogram decoding part 11, adders 13 and 14, and a counter 12. The register part 2 includes selecting parts 21-23 and registers 24- 26. The counter 12 is controlled by a program instruction decoded at the part 1, and the registers 24-26 are selected by the counter 12. Thus both a pop operation and a push operation are realized with just an instruction and with the selection of the registers 24-26. In such a way, an effective data transfer process is ensured in a stack operation mode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a news processing device controlled by a microprogram.

Conventionally, the central processing unit of an information processing system consists of registers dedicated to the stack, i, 11, b, and E121, and a plurality of general-purpose registers that are not used for the stack function. In this way, stack acid i is realized. This requires the use of the stack-dedicated register in FJu and the memory of the main storage device E, and the central processing unit and The transfer of data between main memory devices is absolutely necessary, and in recent years information processing systems have been used to explore structural structures, The number of stack operations required has increased rapidly.

However, in the stack-dedicated 1/in-star method described in 141), the number of stack-dedicated registers is limited to the number of stack-dedicated registers.

[If the number of VC required registers is less than 1. [Because of this, I took out the memory of the main TDFJII device for a while and was worried about this shortage.

As a result, there is a drawback in that stack calculation cannot be performed in a continuous manner.

The purpose of the present invention is to eliminate such an input point I'1, which is necessary for direct stack calculation. Avoid data transfer between the central processing unit and the main memory i, or reduce the number of transfers as much as possible ri < L, stack y
The object of the present invention is to provide a microboogram control device j1 that can efficiently implement L calculation processing.

The IC of the present invention is an adjustment register 7) λ et ff /J
Data transfer between the register section (!-) and the performance section.
In the arithmetic system controlled by the microprogram instruction, the selection of the register is performed based on the contents of a counter that is controlled by the microprogram instruction, l1iII
The device l is submerged.

Hereinafter, the invention will be explained with reference to the drawings showing embodiments.

FIG. 1 is a block diagram showing one embodiment of the present invention, and shows the microprogram system of the present invention @ *'i it +':t,
1bll Consisting of decorative part l, register part 2, and cone part 3a, cape cape 11Q, microphone 2'μgram 6kii, i
a part 10. The register section 2 consists of a microcomputer program, a reading section 11, and a counter 12. The register section 2 includes a selection section 21 to
23, registers 24 to 26 respectively constitute iL 7.

First, the microprogram 111 of the present invention is installed on the device.

The microprogram instruction decoder 11 of the control door 1 reads the microphone p program 11 self ↑ Ikugawa ti o, Norama f r μ
Purgram - Extracted Ordinance 197. This instruction is a 4-leg process related to the contents of a register, and whether the instruction selects a register according to the contents of the counter 12 (hereinafter referred to as the register selection operation 4 instruction) or not, all microboo program instructions 19 Judgment is made based on field 111.

If the instruction ', 'r19 is a register selection operation instruction, the 0 field 1 of the microprogram feed 19
13 or 0J, the value of the pace register specified by the D field 114 and the head of the counter 12 are input to the θ11 calculator 1.
Registers 24 to 26 based on the value added in 3 or 14
Make all selections. At this time, the decision as to which of the B field 113 and the D field 114 is to be taken out is made based on the contents of the command field 111. - moth, A field 1
12 allows register selection to be specified independently of the contents of the counter 12.

If the value of the pace register is taken out from the B field 113, this means that the selection unit B22 selects the contents of the register determined by the contents of the B field 113 and the counter 12 as input data for the calculation process of WWB2. do. On the other hand, when taking out the E of the pace register from the D field, the selection section D21 selects the operation in the calculation section 3, J
4 [The register in which the resulting output data is to be set is selected by the contents of the D field 114 and the counter 12,
heart. In other words, the selection unit A23 and the selection unit B22 read the contents of a specified register 24 to 26 and transfer the data to the specified register 3. The result data of the arithmetic unit 3 is set in certain registers 24-26.

The value of counter 12 is i6 controlled by counter change field 115. In other words, the value in the counter change field 115 becomes a new counter value based on the value of the counter 12 at that time.

The above is the microprogram of the present invention, 1III41
1 is a schematic description of the device 1;

Next VC1 How is stack operation realized by this microprogram control device? We will provide a detailed explanation of

First, Figure 2 (a), jb), (c), l
Use d) to star.

The calculation is 1i11. Tomorrow, 6° stack performance J! l [v, the top of the stack at the current time, -5- is taken out t pop operation Jli [(data X in Figure 2 (C)
2(d)), and a bushing operation that adds new data to the top of the current stack (by adding data IC
) and S). These pop operations and bush operations are realized as follows using the microphone p-gram system of the present invention.

First, as an initial state, the pace register specified by the counter 12i (0 is set and the B field 113 and 1) field 114 is:
In order to set the register 24 to 0 (0-register 1), both the B field 113 and the D field 114 are set to 0 (0-register 1). This is realized by setting 1 in the field 114 and the counter change field 115. In other words, this specified F
First, 1) m (0) in the field 114 is set to the D bus 54. (From /c, also counter change field 11
Value of 5 (1) 'i 'lAi calculated counter (1)
or counter value extraction line 56. Tomo 1# vessel 6 respectively
− 14, and the adder 14 adds this addition result (l=0+
1) is transferred to the selection unit D21 through the D bus 54□. The selection unit D21 translates the register 24 based on this value (1), and sets the data 2 received from the performance group 3 through the D bus 54 in this register 24.
Similarly to (,) in the figure, /(:, set 1 in the counter change field 115, and increase the value of color /12 by 1). In other words, 1 shift is increased by 2.3. By changing data Y and data X to registers 25 and 26, data Y and
b) 'U-The stack of Yang 2 diagram (C) is formed.

At this point, the content of the counter 12 is 3. Next, a pop instruction to take out data X at the top of the stack is realized by setting -1 in the B field 113 and the Q71 counter/reverse change field 115, respectively. That is, the force II 4 s'i 13 is the value i0) of the B field 113? l-11 bus 53
1 ↓, the value of the counter 12 (3), and the value of the counter 12 is taken from 56□, and the result of adding these is transferred to the selector B22. Next, the selection section B22
Based on the value (3) taken from the calculator 13, the receiver selects the register 26, and sets the contents of the register 26 (data X) to B.
The data is transferred to the calculation unit 3t through the bus 533. lastly,
The value of the counter 12 (3) The value of the VCC meter change field 115 (1) kjJo is calculated and the chain of the counter is newly set to 2 (=3-1). This result is 21st-! U(d
). For push and pop instructions, counter 1
The timing for updating the value of 2 is different depending on the counter change field 115 of the microprogram instruction. In other words, the push instruction changes the contents of the counter 12 in the counter change field 115 before determining the selected register, but the pop instruction changes the counter value after determining the selected register. If, uh.

According to the present invention, the counter 12 for register selection is crossed with AAA12S3, and all registers are set for historical use. From the functions 1 and 1, it is possible to realize the BO, BU, and PUSH calculations in a single unit, and the data transfer process during the stack operation can be realized effectively and efficiently.

Incidentally, according to the present invention, a microprogram control device having n registers can be constructed easily as well.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 1a
), lb), Ic), and (d) are explanatory diagrams of stack stimulation according to the present invention. In the figure (, l... sub 141 part, 2... register part, 3... performance part, 12... counter, 19... microprogram instruction, 24, 25.26... register It9- Ladder 2 (c) (d)

Claims (1)

[Claims] The register section consists of multiple D registers and Rino 1.
i [1 kJ with the group,') data transfer t microprogram 1ψ to 2 (18 in the operating system to control
, 11, and Rtint: row 5. of the counter controlled by the microprogram 6u. Microprogram control characterized by: 4 series 1, 10