JPH0318930A - Microprogram control system - Google Patents

Abstract

PURPOSE:To facilitate the change, the addition, etc., of programs by transferring a microprogram to a 2nd memory from a 1st memory and carrying out the microprogram via the 2nd memory. CONSTITUTION:A ROM 1 has a large capacity and a low speed and is rewritable. A RAM 3 has a medium capacity and a high speed and receives an edited microprogram from the ROM 1 via a transfer circuit 2. The microprogram received from the circuit 2 is changed to a horizontal type from a vertical type. At this time point, the ROM 1 and the circuit 2 are separated from a microprogram control part 8. Hereafter the part 8 carries out the normal microprogram control via the RAM 3. As a result, the microprogram can be easily changed with the inexpensive hardware.

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a control method for a control device, Regarding black program control.

[Conventional technology]

In particular, horizontal type microcontrollers have conventionally been controlled in such a way that microprograms are stored in a ROM and programmed sequentially by reading them one by one.

[Problem to be solved by the invention]

This ROM requires high-speed access time, and a high-speed P
ROM etc. were mostly used, and low-speed rewritable ICs etc. were not used.

Furthermore, if there is a bug in the microprogram, it has the disadvantage that, in most cases, several to several ICs must be converted.

If you download from the upper level without using PROM, etc., the above case will not occur, but the load program will have to be changed or added when rewriting, and it will take a lot of time to synchronize the changes with other devices. It had the following drawback.

[Means to solve the problem]

According to the present invention, in a control device that executes control using horizontal microprogram control, a first microprogram memory that stores microprograms in a vertical manner, a second microprogram memory that stores them in a horizontal manner; A microprogram control method is obtained, comprising means for editing and transferring from the first memory to the second memory, and executing the microprogram on the second memory after being transferred.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, in the embodiment of the present invention, the large-capacity low-speed ROM 1 is stored in 8-bit units as shown in FIG.
It is programmed in 8-bit units, as shown in FIG.
1-2. 1 to 6 form one instruction code.

The instruction storage (horizontal microprogram) RAM 3 is stored in the format shown in FIG. Transfer circuit for transferring the microprogram from ROMI to ROM32. A microprogram instruction register (MIR) 5 that fetches a microprogram on the RAMB, a high-speed processor 6 that performs calculations based on the fetched MIR, a lower control unit 7 that operates under the control of the high-speed processor, and an RA.
It is composed of an SC (sequence controller) 5 that provides addresses on the MB.

The present invention configured as described above will be explained in detail.

ROM1 is a large-capacity, low-speed ROM, and is also a rewritable memory. RAM3 is a medium-capacity high-speed RAM, and R
After editing, the microprogram is transferred from OM1 to RAM3 via transfer circuit 2. This transfer circuit 2 may be constructed of wired logic or may be constructed of a general-purpose microprocessor. The microprogram transferred from the transfer circuit 2 in this way is changed from a vertical type to a horizontal type, and at this point, the ROMI and the transfer circuit 2 are separated from the microprogram control unit 8.

From then on, the microprogram control unit 8 uses RAM 3゜MIR5.
, the high-speed processor 6, the SC 4, and the lower control unit 7 are combined to execute normal microprogram control.

〔Effect of the invention〕

As explained above, the present invention has the effect of making it easy to change microprograms using inexpensive hardware.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram partially showing an embodiment of the present invention as a block diagram, FIG. 2 is a diagram showing the contents of the ROM shown in FIG. 1, and FIG. 3 is a diagram showing the contents of the RAM shown in FIG. It is a diagram showing the content structure. DESCRIPTION OF SYMBOLS 1...Large capacity low speed rewritable ROM, 2...Transfer circuit, 3...Medium capacity high speed RAM, 4...Sequence controller (SC), 5...Micro instruction register (MIR), 6...・High-speed processor, 7・
...Lower control section, 8...Microprocessor control section.

Claims (1)

[Claims] In a control device that executes control using horizontal microprogram control, there is a first microprogram memory that stores microprograms in a vertical manner, a second microprogram memory that stores microprograms in a horizontal manner, and a second microprogram memory that stores microprograms in a horizontal manner. 1. A microprogram control method, comprising means for editing and transferring the microprogram to a second memory, and executing the microprogram on the second memory after being transferred.