JPH0728574A - Hot-swap method - Google Patents

Abstract

(57) [Abstract] [Purpose] The bus interface circuit is disabled when hot-plugging and unplugging. [Structure] A plurality of electronic circuit packages 21, ..., 2n,
A hot-swap power supply package 10 and a back wiring board having a -48V power bus 30, a signal bus 40, and a + 5V power bus 50. When the electronic circuit package 21 is inserted and removed, the hot-swap power supply package is installed. The + 5V power supply supplied from 10 disables the bus interface circuit 231 of the electronic circuit package 21 that has been hot-swapped, and the signal terminal 241 is inserted and removed in this state. [Effect] When the electronic circuit package is inserted / removed, the signal terminal is inserted / removed by setting the bus interface circuit of the electronic circuit package, which is hot-plugged / unplugged by the power supply from the DC-DC converter of the hot-plugging / unplugging power supply package, to the bus isolation state. Therefore, hot plugging and unplugging can be performed without adversely affecting other packages connected to the bus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-swap system for a unit in which a plurality of electronic circuit packages each having an on-board power supply are connected to a bus of a back wiring board.

[0002]

2. Description of the Related Art Conventionally, a hot-swap system in a unit in which a package equipped with an on-board power supply of this type is bus-connected to a back wiring board has an on-board power on / off switch linked to an insertion / extraction lever. When the package is inserted, the package terminal signals are completely connected to the back wiring board of the unit before this package is turned on.When the package is removed, the package power is turned off. The signal terminals were separated from the unit.

[0003]

In this conventional hot-swap system, the hot-swapping of the package is performed while the output of the on-board power supply in the package is stopped and the signal terminals are unstable. There is a problem that it affects other packages connected to the bus.

[0004]

According to the present invention, in a unit in which a plurality of electronic circuit packages each mounting an on-board power source having package terminals having stepwise different lengths are bus-connected by a back wiring board, When the electronic circuit package is inserted / removed, a hot-plugging / unplugging power supply package equipped with an on-board power supply for supplying power to the insertion / removal electronic circuit package is connected to the bus, and when the electronic circuit package is inserted, the back wiring board of the unit is connected. Before the signal terminals of the electronic circuit package are connected to the bus, the on-board power supply of the hot-swap power supply package brings the signal terminals into a high impedance state, and when the electronic circuit package is removed, the unit of the Back wiring board bus from the electronic circuit Hot swap scheme is obtained, characterized in that the on the signal pin by board power of the hot-swap power supply package before the signal terminals of Kkeji is disconnected to the high impedance state.

Each of the electronic circuit packages has a long-pin + 5V package terminal connected to the + 5V power source bus of the back wiring board, and a short-pin signal terminal connected to the back wiring board signal bus. An onboard power switch provided between the -48V power supply bus of the back wiring board and the onboard power supply and having a long pin -48V package terminal, wherein the hot-swap power supply package is the onboard A hot-swap system is provided, which is provided with long-pin + 5V package terminals and long-pin -48V package terminals for connecting a power supply to the + 5V power bus and the -48V power bus of the back wiring board, respectively.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a unit to which an embodiment of the hot-swap system of the present invention is applied.

In FIG. 1, the unit of this embodiment comprises a plurality of electronic circuit packages 21, ..., 2n, a hot-swap power supply package 10, a -48V power bus 30, a signal bus 40 and a + 5V power bus 50. And a back wiring board having.

The power supply package 10 for hot-swap is -4
Long pin -48V package terminal 17 from 8V power bus
DC-DC converter 11 of the on-board power supply that converts -48V input through + 5V to DC-DC
The converter 11 outputs + 5V to the + 5V power supply bus 50 through the long-pin + 5V package terminal 15.

Each of the electronic circuit packages 21, ..., 2n has the same structure. For example, the electronic circuit package 21 is connected to the + 5V power source bus 50 through gradually different package terminals, that is, + 5V package terminals 251 having long pins. Power connection circuit 221 and short pin signal terminal 241
A bus interface circuit 231 connected to the signal bus 40 through the on-board power switch (SW) 261.
When the power is turned on, the long pin -4 from the -48V power supply bus 30
The DC-DC converter 211 is an on-board power supply that inputs -48V through the 8V package terminal 271, converts it to + 5V, and outputs it to the power supply connection circuit 221.

The power supply connection circuit 221 uses the + 5V from the + 5V package terminal 251 and the DC-DC converter 2
This is a 2-input OR circuit that receives + 5V from 11 as an input.

That is, the electronic circuit packages 21, ..., 2
n is a long pin + 5V package terminal 251, ..., 25n
, 24n are connected to the + 5V power supply bus 50, and to the signal bus 40 by short-pin signal terminals 241, ..., 24n, and SW261, ..., 26n are long-pin −48.
, 27n are connected to the -48V power supply bus 30.

Next, the operation of inserting and removing the electronic circuit package in this embodiment will be described.

For example, when the electronic circuit package 21 is inserted into the unit, first, a long pin + 5V package terminal 25 is formed.
The + 5V power supply bus 50 is connected to the power supply connection circuit 221 by 1, and the bus interface circuit 231 of the electronic circuit package 21 is a live line input through the + 5V package terminal 15, the + 5V power supply bus 50, the + 5V package terminal 251, and the power supply connection circuit 221. The power-on reset is performed by + 5V from the DC-DC converter 11 of the power supply package 10 for insertion / removal, and the signal terminal 241 is in a high impedance state.

Next, the signal bus 40 and the short-pin signal terminal 2
41 is connected, but since the signal terminal 241 is in a high impedance state, another electronic circuit package 2i (here, i = 2, ..., N) connected to the signal bus 40 is connected.
There is no effect on.

After that, all package terminals (-48
V package terminal 271, signal terminal 241 and + 5V
When the package terminal 251) is completely connected and is stable and the SW 261 that is interlocked with the insertion / ejection lever is turned on,
DC- which is the on-board power supply of the electronic circuit package 21
The DC converter 211 can perform normal operation (communication processing operation of the own electronic circuit package 21 including communication between electronic circuit packages).

Next, for example, when the electronic circuit package 21 is removed from the unit, the electronic circuit package 21 is set to a reset state from a host device (not shown) or the like prior to the removal, and its signal terminal 241 has a high impedance. It is in a state.

At the time of removing the electronic circuit package 21, the SW 261 interlocked with the insertion / extraction lever is turned off to bring the DC-DC converter 211 of the electronic circuit package 21 into a stopped state, and the bus interface circuit 231 of the electronic circuit package 21 is hot-swapped. Power supply package 10 DC-
DC converter 11 to + 5V package terminal 15, +
+ 5V is supplied through the 5V power supply bus 50, the + 5V package terminal 251, and the power supply connection circuit 221, and the signal terminal 241 becomes a high impedance state.

After that, the short-pin signal terminal 241 is disconnected from the signal bus 40. However, since the signal terminal 241 is in a high impedance state, it has no influence on other electronic circuit packages 2i connected to the signal bus 40. Absent.

The operation of inserting / removing the electronic circuit package 2i (i = 2, ..., N) other than the electronic circuit package 21 is also the same as the above operation.

[0020]

As described above, according to the present invention, the hot-swap power supply package for supplying power to the electronic circuit package at the time of hot-swapping is provided, and the signal terminals of the electronic circuit package to be inserted and removed are set to the high impedance state. By doing so, there is an effect that hot-plugging and unplugging can be realized with no influence on other packages connected to the bus.

[Brief description of drawings]

FIG. 1 is a block diagram of a unit to which an embodiment of a hot-swap system of the present invention is applied.

[Explanation of symbols]

10 Power supply package for hot-plugging / unplugging 11,211, ..., 21n DC-DC converter 15,251, ..., 25n + 5V package terminal (long pin) 17,271, ..., 27n-48V package terminal (long pin) 21, , 2n electronic circuit package 30-48V power supply bus 40 signal bus 50 + 5V power supply bus 221, ..., 22n power supply connection circuit 231, ..., 23n bus interface circuit 241, ..., 24n signal terminal (short pin) 261, ..., 26n On-board power switch (S
W)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Zenichi Yashiro 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Hiroshi Aoyagi 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. An insertion / removal electronic circuit at the time of insertion / removal of the electronic circuit package in a unit in which a plurality of electronic circuit packages each mounting an on-board power supply having package terminals having stepwise different lengths are bus-connected by a back wiring board. A hot-swap power supply package with an on-board power supply for supplying power to the package is bus-connected, and when the electronic circuit package is inserted, the signal terminal of the electronic circuit package is connected to the bus of the back wiring board of the unit. Before being connected, the on-board power supply of the hot-swap power supply package puts the signal terminals in a high impedance state, and when the electronic circuit package is removed, the electronic circuit package is removed from the bus of the back wiring board of the unit. The signal terminal of is disconnected A hot-swap system, wherein the signal terminals are brought into a high impedance state by the on-board power supply of the hot-swap power supply package before being processed. 2. Each of the electronic circuit packages has a long pin + 5V package terminal connected to a + 5V power source bus of the back wiring board, and a short pin signal terminal connected to a signal bus of the back wiring board. It is provided between the -48V power supply bus of the back wiring board and the on-board power supply and has a long pin-
An on-board power switch having a 48V package terminal, wherein the hot-swap power supply package supplies the on-board power to the + of the back wiring board.
Long-pin + 5V package terminal and long-pin − connected to the 5V power bus and the −48V power bus, respectively.
The hot-swap method according to claim 1, further comprising a 48V package terminal.