JPH0482200B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a hot-swap system.

Prior Art A conventional hot-swap system is shown in Fig. 4. FIG. 4 shows a unit 41 on which a plurality of electronic circuit packages are mounted, a back wiring board 42 for transmitting signals between the packages, a plurality of electronic circuit packages 43, 44, 45, a guide rail 46, and a back wiring board 42 for transmitting signals between the packages. This is a live insertion/extraction method consisting of a extraction hole 47 and extraction/insertion tools 48 and 49. The extraction tool 48 is inserted into the draw hole of the insertion/extraction package 44, and the power supply package 43 is pulled out with the switch in the "ON" state. When inserting the unit 41, the power is similarly turned on and the insertion tool 49 is inserted over the front of the unit 41.

Problems to be Solved by the Invention However, in the conventional hot-swapping method, since the power is inserted and removed while the power is in the "ON" state, noise is generated on the data bus on the backwiring board, and the central processing (CPU) package is 45 had the disadvantage that there was a high possibility of malfunction.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, an object of the present invention is to provide a novel hot-swap system that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology. It is in.

Means for Solving the Problems In order to achieve the above object, the hot insertion/removal method according to the present invention includes a plurality of electronic circuit packages, a package mounting unit on which the plurality of electronic circuit packages are mounted, and a connection between the packages. a back wiring board for transmitting a signal; a logic circuit provided in the package for realizing hot insertion/extraction; and a switching function for removing the package having a switching function formed in the package to be inserted/extracted from among the packages. The unit includes a hole, a switching guide rail having a switching function formed in the unit, and an electrically conductive extraction/insertion tool that is engaged with the hole and the guide rail.

Embodiment Next, a preferred embodiment of the present invention will be concretely explained using the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the present invention.

Referring to FIG. 1, reference numeral 10 is a unit mounting a plurality of electronic circuit packages, 11 is a back wiring board for transmitting signals between the packages, 12 is a package to be inserted and removed, and 1
3 is the central processing (CPU) package, 14, 15
In order to realize hot insertion and removal, package cages 12 and 1 are installed.
3 is a logic circuit provided respectively, 16 is a switching hole having a switching function,
17 is a switching guide rail having a switching function, and 18 and 19 are conductive extraction/insertion tools, respectively.

Next, the operating principle will be explained. One of the switching holes 16 is the A input of the logic circuit ( ) 14, and the other is connected to the ground, and by inserting the extraction tool 18, the A input is connected to the ground and becomes an "O" level input. One side of the switching guide rail 17 is connected to ground, and the other side is connected to the F input of the logic circuit ( ) 15 via the control line 20 on the back wiring board 11.
When applied to 7, the F input is connected to ground and becomes “O”.
This is the level input.

Normally, the package 12 to be inserted and removed continues to operate normally while being inserted. In this state, as shown in FIG. 2, since the input A of the gate of the logic circuit ( ) 14 is pulled up, the value of the output C of the logic circuit ( ) 14 becomes "1". This output C passes through the control line 20 on the back wiring board 11 and becomes the F input of the logic circuit ( ) 15, as shown in FIG. The logic circuit ( ) 15 shown in FIG. 2 operates according to the time chart of the logic circuit shown in FIG. When the F input is "1", the CPU is in a normal operating state.

When the conductive extraction tool 18 is inserted into the switching hole 16 when removing/extracting the package 12 to be inserted/extracted, the A input goes to "0" level as described above, and as a result, the C output also goes to "0" level, and the F input goes to the "0" level. is also at the “0” level. Therefore, the flip-flop FF3 output Q of the logic circuit ( ) 15 becomes "1", and the CPU enters the "HALT" state. Next, when the package 12 to be inserted and removed is pulled out, the C output and the back wiring board 11 are separated, so that the F input becomes a high impedance state. F
Since the input is pulled up, it is fixed at the "1" level, the flip-flop FF3 output Q becomes "0", and the CPU returns to the operating state.

When inserting the package 12 to be inserted or removed, the conductive insertion tool 19 is inserted into the switching guide rail 17.
When applied to , the ground potential is transmitted to the F input of the logic circuit () 15 via the signal line D and the control line 20,
Therefore, as described above, the F input of the logic circuit ( ) 15 connected on the back wiring board 11 also becomes "0". Therefore, the flip-flop FF3 output Q of the logic circuit ( ) 15 becomes "1".
The CPU enters the “HALT” state. Next, when the package 12 to be inserted and removed is completely inserted and the insertion tool 19 is removed from the switching guide rail 17, the F input of the logic circuit ( ) 15 becomes "1". Therefore, the FF3 output Q of the logic circuit ( ) 15 becomes “0”.
Return to CPU operating status.

The above explanation relates to one package to be inserted and removed, but when there are a plurality of packages to be inserted and removed, the control lines on the back wiring board 11 may be connected in multiple ways.

Effects of the Invention As explained above, according to the present invention, even if a package is inserted or removed while the power is on, the CPU temporarily enters the HALT state, so no malfunction occurs. Furthermore, since the HALT switch is not installed in the CPU package, but is switched using a pull-out/insertion tool, there is no human error caused by maintenance personnel.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention;
FIGS. 2 1 to 3 are diagrams for explaining the operation of an embodiment of the present invention. Among them, 1 is a block diagram of a logic circuit, 2 is a block diagram of a logic circuit, and C is a diagram of a back wiring board. Front view, Figure 3 is the operation time chart of the logic circuit () No. 4
The figure is a perspective view showing a conventional hot insertion/removal method. 10,41...Unit, 11,42...Back wiring board, 12,44...Package to be inserted and removed, 13,45...CPU package,
14, 15...Logic circuit, 16...Switching hole, 17...Switching guide rail, 18, 19, 48, 49...Extraction/insertion tool, 20...Control line, 21...Data bus, 2
2...Pin, 43...Power supply package, 46...
Guide rail, 47... Pull-out hole.

Claims (1)

[Claims] 1 A plurality of electronic circuit packages, a package mounting unit on which the plurality of electronic circuit packages are mounted, a back wiring board for transmitting signals between the packages, and a back wiring board provided on the package for realizing hot insertion and removal. logic circuit and
A switching hole for pulling out a package having a switching function formed in the package to be inserted/extracted among the package, a switching guide rail having a switching function formed in the unit, and engaged with the hole and the guide rail. A hot-line insertion/extraction method characterized by having a conductive extraction/insertion tool.