JP2001022479A - Information processing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To change the state setting of a system without turning off the power or opening the housing, and if the setting is not appropriate, forcibly return to the initial state of the system. SOLUTION: There are provided a clock supply means 102 for supplying a clock to a CPU 100, and a power supply means 101 for supplying power to the CPU. System status setting storage means 1
03 is a clock frequency supplied to the CPU 100 and C
The operating frequency inside the PU and the voltage applied to the CPU are stored. There is a system setting value delay unit 104 that does not change the output of the system state setting storage unit 103 immediately after the setting value is changed, and outputs the output after a lapse of a predetermined time after system initialization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system setting method for changing system setting values such as a power supply voltage and an operating frequency of a CPU without turning off a power supply by a switch.

[0002]

2. Description of the Related Art FIG. 2 shows a block diagram for setting a system according to the prior art. Generally, the information processing apparatus is designed so that the state of the system, for example, the operation speed and the power supply voltage of the CPU 200 can be set to a certain set value.
To set U, turn off the power once and set DIP switch 2
03 or a jumper switch. At this time, most existing information processing devices
This setting must be made by opening a part of the housing. In addition, since the setting itself is a combination of switches, a manual describing the details of the setting is required, and it cannot be easily set by anyone.

[0003]

However, in the above-described prior art, every time it is necessary to change the set value of the system state, the power is turned off, the housing is opened, and the setting of the dip switch or the jumper switch is manually changed. It is necessary to change according to the instructions and turn on the power again.

[0004] If the setting is not appropriate, there is a problem that the setting of the dip switch or the jumper switch needs to be performed again.

The present invention has been made to solve such a problem, and changes the state setting of the system without turning off the power or opening the case. The purpose is to enable the system to be in the initial state.

[0006]

An information processing apparatus according to the present invention comprises: a clock supply unit for supplying a clock to a CPU;
A power supply unit for supplying power to the CPU, a system state setting storage unit connected to a bus accessible from the CPU, for storing a clock frequency supplied to the CPU, an operating frequency inside the CPU, and a CPU voltage; The present invention is characterized by having a system setting value delay unit that does not change the output of the system state setting storage unit immediately after the setting value is changed, and outputs the output after a lapse of a predetermined time from the initialization of the system.

A clock supply unit for supplying a clock to the CPU; a power supply unit for supplying power to the CPU; a clock frequency supplied to the CPU connected to a bus accessible from the CPU or a clock frequency within the CPU. A system state setting storage means for storing the operating frequency or the voltage applied to the CPU, and a predetermined time after the initialization of the system without changing the output of the system state setting storage means immediately after changing the set value. And a system setting value delay means for outputting later.

Further, there are provided default value storage means for storing an initial value of the set value of the system set value storage means, and set value initialization means for setting the initial value to the set value of the system set value storage means. It is characterized by the following.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail using an embodiment of the present invention.

FIG. 1 is a block diagram showing a configuration of a CPU state setting unit of an information processing apparatus according to one embodiment of the present invention. In this embodiment, the state of the CPU, that is, the clock frequency supplied to the CPU, the internal clock frequency of the CPU, and C
A description will be given of an example of how to change the setting of the power supply voltage applied to the PU without opening the housing and without turning off the power.

In FIG. 1, reference numeral 100 denotes a CPU. C
The PU 100 receives an operation clock 114 and an internal operation clock setting signal 113 in order to determine the operation mode. Normally, the CPU 100 sets the input clock frequency to N
(Megahertz), the internal clock frequency M is M
= F (N, X), that is, a function of the operation clock 114 and the internal operation clock setting signal 113. Here, X is an internal operation clock setting signal 113, which is composed of one or more signal lines. Also, depending on the difference between the CPUs 100, the applied power supply voltage must be changed. 115 is DC / D
This is the CPU power output from the C converter 101. The operation mode of the CPU depends on these two types of control signals 11.
3, 114 and the CPU power supply 115.

The CPU 100 is connected via a bus 116 to a system state setting storage means 103 for storing system state settings. System setting storage means 1
The set value of 03 can be read and written from the CPU 100 through the bus 116. The power supply of the system setting storage unit 103 is connected to a backup power supply 108 that can be supplied even if the main power supply is turned off.

The system setting storage means 103 includes:
Initial value storing means 106 for storing initial values of CPU setting values and setting value initializing means 1 for converting output 107 of system setting storing means into contents of initial value storing means 106
05 is connected. The output 107 of the system setting storage unit 103 is input to the set value delay unit 104. A backup power supply 108, a system power supply (hereinafter, VCC) 109, and a system initialization signal 110 are input to the set value delay unit 104. The set value delay means 10
4 outputs a clock mode signal 111 to a clock generation circuit (hereinafter abbreviated as PLL) 102 to generate an operation clock 114, and an internal operation clock setting signal 1
13 is input to the CPU.

In order to generate the CPU power supply 115,
The CPU power supply voltage setting signal 1120 is also set value delay means 10
4 is output. The power supply 120 (hereinafter abbreviated as P / S) is connected to an AC power source to supply the necessary VCC to the system.
109, etc. are generated. The P / S 120 can be turned on / off by a software P / S control signal 121.

FIG. 3 shows an example of the internal configuration of the system setting storage means 103. The configuration of the system setting storage unit 103 can be the same as the port of a general I / O device. That is, there is an address decoder 300 that decodes an address output from the CPU 100. When an address indicating the system setting storage unit 103 is accessed, a chip select signal 307 is output.
If the access is a write operation, the data on the corresponding data line 308 passes through the selector 301 and is written to the latch 302 by the write command 309.
Data is taken in.

When the CPU 100 explicitly sets data in the system setting storage unit 103, the set value is written to the latch 302 by the above-described method.
The case where the set value of 02 is set to the value of the initial value storage means 106 will be described below.

Generally, an information processing apparatus has an initialization signal 110 for initializing a system. When the power is turned on or the initialization button is pressed, the initialization signal 1
10 can be generated. In the case of the present invention, as shown in FIG. 7, a power switch 701 is provided, for example, on the front surface of an information processing apparatus 700, and an opening / closing section 704 is provided. Opening / closing part 7
04 includes a system initialization signal generation button 703 and a slide switch 702, for example.
With the setting of 02, an initialization permission signal 117 for causing the output 112 of the initial value storage means 106 to be set in the system setting storage means 103 is generated. Here, if the initialization permission signal 117 is Low when the system initialization signal 110 becomes Low active in FIG. 3, either the gate 303 or the gate 304 depends on the state of the output of the initial value storage means 106. Becomes low. The low output of the gate 303 or 304 is latch 3
02 set or reset terminal is activated and latch 3
02, and the output 10 of the system setting storage means is determined.
It becomes 7.

The output 107 of the system setting storage means alone does not actually change the system settings. To make the output 107 of the system setting storage unit 103 effective, it is necessary to initialize the system once. Especially D
To change the output of the C / DC converter 101,
At least the power of the DC / DC converter 101 must be turned off once. A sequence when the power is turned off is shown in FIG. 4 and will be described. When the power is turned off at time T1, the VCC 109 falls in an exponential curve. At this time, if the comparator 502 as shown in FIG. 5 is used, the value of the resistor 500 and the value of the resistor 501 can be used to compare VCC with the reference voltage VREF. The reference voltage in FIG. 5 is (VCC × R2) / (R1 × R
Given in 2). Time T when the voltage falls below this voltage VREF
At 2, the output of the comparator 502 becomes Low. This can be used as the initialization signal 110. Also, when the power is turned on again, the comparator 50
2 is low, but the reference voltage VREF
, The comparator output becomes High. Here, in order to generate the reference voltage, the
The backup 108 is used to hold the voltage even when the power is turned off. The initialization signal 110 generated in this manner is input to the delay unit 506, and is ANDed with the delayed output 507 to generate the latch signal 503 as shown in FIG. The latch signal 503 is input to the latch 504,
The output 107 of the system setting storage means 103 is latched 50
Take in 4.

With the configuration shown in FIG.
DC / DC converter 10
The setting of 1 can be changed without any problem.

If the delay amount of the delay means 506 is set so as to be TX in FIGS. 4 and 5, the output 505 of the latch 504 is changed at the timing shown in FIG.

As described above, since the system settings are changed while the VCC 109 is off, the CPU 100 or the DC / DC converter 101 or the like does not allow the setting to be changed only after the power is always turned off. The setting of the setting storage unit 103 is changed and the CPU 100
Power on / off of P / S 120 by software
By turning off, button operation becomes unnecessary. Also,
The components of the present invention can be accessed by software, and if software that can execute a series of operations face-to-face is combined, it is possible to change system settings without looking at the manual. It becomes possible.

[0022]

As described above, according to the present invention, it is possible to change the setting of the system without turning off the power of the system and opening the lid of the housing. If the setting is inappropriate, the system setting value is forcibly returned to the initialized system setting value, and the system can be started reliably.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a conventional technique.

FIG. 3 is a diagram showing a configuration example of a system setting storage unit.

FIG. 4 is a timing chart showing turning on and off of a power supply.

FIG. 5 is a diagram showing a configuration example of a system setting value delay unit.

FIG. 6 is a timing chart in a system setting value delay unit.

FIG. 7 is a diagram of one embodiment of an information processing apparatus using the present invention.

[Explanation of symbols]

 Reference Signs List 100 CPU 101 DC / DC converter 102 PLL 103 System setting storage means 104 Set value delay means 105 Set value initialization means 106 Initial value storage means 107 Output of system setting storage means 108 Backup power supply 109 VCC 110 System initialization signal 111 Clock mode Signal 112 CPU power supply voltage setting signal 113 Internal operation clock setting signal 114 Operation clock 115 CPU power supply 116 Bus 117 Initialization permission signal 120 P / S 121 Software P / S control signal 300 Address decoder 301 Selector 302 Latch 303 Gate 304 Gate 305 Latch reset signal 306 Latch set signal 307 Chip select signal 308 Data 309 Write command 500 Resistance 501 Resistance 502 CON Correlator 503 latch signal 504 latched 505 delayed system settings 506 initialization signal delay means 507 delayed initialization signal 700 information processing device 701 power switch 702 slide switch 703 initialization signal generation button 704 closing unit

Claims (2)

[Claims] 1. A clock supply unit for supplying a clock to a CPU, a power supply unit for supplying power to the CPU, and a CP connected to a bus accessible from the CPU.
A system state setting storage unit for storing a clock frequency supplied to U, an operating frequency inside the CPU, or a voltage applied to the CPU; and an output of the system state setting storage unit, which is not changed immediately after the set value is changed. An information processing apparatus comprising: a system setting value delay unit that outputs a predetermined time after the initialization is performed. 2. The information processing apparatus according to claim 1, wherein a default value storage unit that stores an initial value of a setting value of the system setting value storage unit, and the initial value is set to a setting value of the system setting value storage unit. An information processing apparatus comprising: