JP2002032326A - Extended slot hot plug controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for solving the problems that conventionally HW quantity increases, when the number of extended slots is increased in an extended slot hot plug controller, that a bus has to be made to be in a standby state whenever an extended card is added or eliminated a plurality of times and the bus performance accordingly decreases, and that an extended slot hot plug controller is needed in every bus and the HW quantity is increased in a system having a plurality of buses. SOLUTION: A bus selector is provided on the post stage of a control register, an extended slot selector for allocating a control signal from a control circuit on the post stage of the bus selector to extended slots is provided, hot plug control over a plurality of buses can be performed, without having a plurality of extended slot hot plug controllers, a control register and a control circuit do not have to be provided for every extended slot any longer, and hot plug control can also be performed to a plurality of extended slots at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a hot plug (H
The present invention relates to an expansion slot (slot) that can be connected / disconnected by an ot-Plug mechanism, and more particularly to an expansion slot / hot plug control device that controls a hot plug mechanism of an expansion slot.

[0002]

2. Description of the Related Art PCI (peripheral component inter
JP-A-11-184578 (Japanese Patent No. 29655)
No. 52) includes PCI and USB (Universal Serial B).
us) and _{I 2 C (I 2 C specifucation} : transmitting data using OS and device driver software standard interface) SIU (System Interface Uni
t), connected to SIU, external reset control signal, present detection signal, enable signal, LED
R for receiving and storing the control signal and the physical ID signal
U (Register Unit), a PCU (Power Control Unit) that reads data from the RU and outputs a signal for controlling the system power supply and the slot power supply, and reads a control signal from the RU and outputs a signal between the PCI bus signal and the PCI slot. BIU (Bus Interface Un) that turns on / off the signal line
it) and a hot plug controller that is configured on one chip is provided.

In this hot plug controller, hot plug control for an expansion slot is performed individually.
Each time an expansion slot is connected to a bus, the bus is controlled to be in a standby state, which is a factor that lowers transfer performance.

Further, since a control circuit is provided for each individual slot, the amount of hardware increases as the number of expansion slots increases. It is necessary to have a slot hot plug controller, which is a factor of further increasing the amount of hardware.

[0005]

The above-mentioned conventional expansion slot / hot plug controller has the following problems.

The first problem is that when the hot plug mechanism is operated to connect or disconnect the expansion slot to / from the bus, the expansion slot / hot plug controller always waits for the bus during connection / disconnection to / from the bus. When adding or deleting a plurality of expansion cards to a plurality of expansion slots due to the state, a bus standby state corresponding to the number of expansion cards to be added or deleted occurs, and the transfer performance of the bus is reduced. It is that.

[0007] The reason is that the expansion slot / hot plug controller cannot control simultaneous operation between the expansion slots because the hot plug mechanism is controlled for each expansion slot.

A second problem is that when an expansion slot / hot plug mechanism is provided in a system having a plurality of buses, an expansion slot hot plug controller is required for each bus, so that the amount of hardware is reduced. It means that it increases.

The reason is that the conventional expansion slot hot plug controller can have the expansion slot hot plug control function only for each expansion slot on a single bus.

A third problem is that the expansion slot / hot plug controller is connected to an SIU that transmits data using PCI, USB, and I2C, and is connected to the SIU to provide a reset control signal, a present detection signal, an enable signal, RU for receiving and storing signals, LED control signals and physical ID signals, a PCU for reading data from the RU to output signals for controlling system power and slot power, and a PCI for reading control signals from the RU.
Since each expansion slot has a bus signal and a BIU for turning on / off a signal line between the PCI slots, the amount of hardware (HW) increases.

[0011] The reason is that the expansion slot hot plug controller controls the hot plug mechanism for each expansion slot.

As described above, in the conventional expansion slot hot plug controller, when an expansion card is added to or deleted from a plurality of expansion slots, control such as connection to or disconnection from the bus is performed for each expansion slot. Therefore, when adding or deleting expansion cards at the same time, there is a problem that a bus standby state occurs depending on the number of expansion cards to be added or deleted, and the performance during that time deteriorates.

In a system having a plurality of buses, a conventional expansion slot hot plug controller can only control a single bus. Therefore, an expansion slot hot plug controller is required for each bus.

The conventional expansion slot hot plug controller has a control register and a control circuit for each slot. There are a plurality of similar circuits which are operated (simultaneous control cannot be performed).

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to select a plurality of slots to be added or deleted by performing simultaneous control by selecting a plurality of slots. A device that enables simultaneous addition or deletion of expansion cards to a plurality of expansion slots and minimizes a bus standby state that occurs when connecting each expansion slot to a bus, thereby avoiding a drop in bus performance. Is to provide.

Another object of the present invention is to reduce the amount of hardware of a device that enables connection or disconnection of an expansion card to or from an expansion slot in a plurality of buses.
It is an object of the present invention to provide a device capable of high integration.

Still another object of the present invention is to provide an apparatus which simplifies the circuit configuration by reducing the number of control registers and control circuits conventionally provided for each expansion slot.

[0018]

According to the present invention, there is provided an arithmetic processing unit for receiving an input hot plug instruction, decomposing the instruction into an instruction to be executed inside the apparatus, and outputting the instruction. A control register for holding an expansion card addition instruction or a deletion instruction, a control circuit for generating a predetermined control signal according to a hot plug sequence based on the instruction held in the control register, and sequentially transmitting the control signal; A hot plug mechanism for connecting or disconnecting the expansion slot to or from the bus by the control signal generated by the circuit; and a status register for holding a state of the hot plug mechanism. Each time the control signal sequentially transmitted from the control circuit is executed, The state is held in the status register performing status notification of the plug mechanism.

The present invention further includes one of the control registers for holding an expansion card addition instruction or a deletion instruction output from the arithmetic processing unit, and is output from the arithmetic processing unit out of a plurality of buses. A bus selector for selecting a bus for executing an instruction held in the control register based on bus selection information; and a control circuit for generating and sequentially transmitting the control signal based on the instruction held in the control register. A plurality of buses are provided corresponding to the buses, a plurality of buses are provided corresponding to the buses, and the control circuit generates and sequentially transmits the buses based on expansion slot selection information output from the arithmetic processing unit. Control signals for the selected bus
And a slot selector for distributing to the selected expansion slot.

Alternatively, the present invention includes one of the control registers for holding an expansion card addition instruction or deletion instruction output from the arithmetic processing unit, and transmits the control signal based on the instruction held in the control register. One control circuit for generating and sequentially transmitting,
A configuration may be provided that includes a slot selector that distributes the control signal generated by the control circuit and sequentially transmitted to the selected expansion slot based on the expansion slot selection information output from the arithmetic processing unit.

[0021]

Embodiments of the present invention will be described. FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. Referring to FIG. 1, there are two buses, and each bus (B
1, B2) in a system having four expansion slots (SL1 to SL4, SL5 to SL8) under the control of expansion slots / hot plugs (Hot-Pl) which enable hot plug control of all expansion slots.
ug) The configuration of the controller (HPC) is shown.

Referring to FIG. 1, when an expansion slot expansion card is added or deleted during system operation, power supply control to an expansion slot, connection control to a bus, and control of signals such as a clock and a reset are performed. A processing unit C for receiving an expansion slot / hot plug controller HPC to be performed and a hot plug instruction, decomposing the instruction into an addition or deletion instruction, bus selection information, and expansion slot selection information and transmitting the same.
U, a first bus B1 having an expansion slot provided with a hot-plug mechanism, and a second bus B2 having an expansion slot provided with a hot-plug mechanism and different from the first bus B1
And hot-pluggable expansion slots SL1 to SL4 connected to the first bus B1 and hot-pluggable expansion slots SL5 to SL8 connected to the second bus B2.
Hot plug mechanisms HPU1 to HPU4 for connecting the expansion slots SL1 to SL4 to the first bus B1; hot plug mechanisms HPU5 to HPU8 for connecting the expansion slots SL5 to SL8 to the second bus B2; Status registers SR1 to SR8 for storing the statuses of the mechanisms HPU1 to HPU8, a control register CR1 for storing an instruction from the arithmetic processing unit CU,
Among the second buses, the bus specified by the bus selection information signal 20 transmitted from the arithmetic processing unit CU is selected, and the hot plug instruction transmitted from the control register CR1 is transmitted to the control circuit of the selected bus. A bus selector BS1 for transmission, a first control circuit CS1 for decomposing a hot plug instruction to the first bus B1 transmitted from the bus selector BS1, generating various control signals, and sequentially transmitting the signals, and a bus selector BS1. A second control circuit CS2 that decomposes a hot plug instruction to the second bus B2 transmitted from the BS1, generates various control signals, and sequentially transmits the control signals, and an extension slot selection information signal transmitted from the arithmetic processing unit CU 30 selects an expansion slot for executing a hot plug instruction, and sets the first control circuit CS
The first expansion slot selector SS1 for transmitting each control signal sequentially transmitted from the first expansion slot to the hot plug mechanism of the selected expansion slot, and the hot plug instruction by the expansion slot selection information signal 31 transmitted from the arithmetic processing unit CU. , And a third expansion slot selector SS2 for transmitting each control signal sequentially transmitted from the second control circuit CS2 to the hot plug mechanism of the selected expansion slot. .

A hot plug driver (C, not shown) for controlling the expansion slot hot plug controller HPC
It is issued by I / O driver software executed on PU, etc., and is used for I ₂ C, USB, ISA (Industry Stan
When the expansion slot / hot plug controller HPC receives a “command to add or delete an expansion card from the expansion slot” transmitted by the dard Architecture) bus,
The arithmetic processing unit CU in the expansion slot / hot plug controller HPC decodes this instruction, and outputs an instruction to “add an expansion card” or “delete an expansion card”; and a first bus B1 or a second bus B1. Bus selection information for selecting the bus B2, and expansion slot selection information for selecting the expansion slots SL1 to SL8.

The arithmetic processing unit CU sends an instruction to “add an expansion card” or an instruction to “delete an expansion card” as a hot plug instruction signal (hot plug instruction) 10. Further, the arithmetic processing unit CU transmits the bus selection information for selecting the first bus B1 or the second bus B2 to the bus selection information signal 20 (this bus selection information signal selects either one of the buses B1 and B2). Bus can be selected at the same time). Further, the arithmetic processing unit CU includes an extension slot SL1
４SL4 is transmitted by an expansion slot selection information signal 30 (a plurality of expansion slot selection information signals can select an expansion slot at the same time), and expansion slots SL5 to SL8 are selected. The slot selection information is transmitted to the expansion slot selection information signal 31.
(A plurality of expansion slot selection information signals can also be selected at the same time.)

The control register CR1 is transmitted from the arithmetic processing unit CU as a hot plug instruction 10,
An instruction to “add an expansion card” or an instruction to “delete an expansion card” is stored.

The bus selector BS1 selects a bus to which an expansion card is added or deleted, based on a bus selection information signal 20 for selecting the first bus B1 or the second bus B2 sent from the arithmetic processing unit CU. Control register CR
An instruction to “add an expansion card” or an instruction to “delete an expansion card” stored in No. 1 is sent to the first control circuit CS1 or the second control circuit CS2 corresponding to the selected bus.

The first control circuit CS1 or the second control circuit CS2 receiving the instruction to "add an expansion card" or the instruction to "delete an expansion card" sends the instruction " Add "instruction, slot power on enable (Power ON Enabl
e), reset (Reset) assert, bus control signal
(Arbitration signal REQ (asserts REQ and requests the right to use the bus when the master device performs bus access), GNT (arbitration function asserts GNT to the master device that has asserted REQ to allow use of the bus) , Interrupt signal INT, clock CLK, etc.) bus switch enable (Enable), bus address /
Various hot plug control signals such as data signal bus switch enable (Enable) and reset / deassert
In accordance with the bus protocol, they are sequentially generated and sent to the first expansion slot selector SS1 or the second expansion slot selector SS2.

In the case of an instruction to "delete an expansion card", reset (Reset) assertion, bus switch disable (Disable) for address / data signal, bus switch disable (Disable) for bus control signal, slot power-on enable Various hot plug control signals such as (Power ON Disable) are sequentially generated in accordance with the bus protocol and sent to the first expansion slot selector SS1 or the second expansion slot selector SS2.

The first expansion slot selector SS1 is based on the expansion slot selection information signal 30 generated and transmitted in the arithmetic processing unit CU, and based on the expansion slot selection information signal 30, the hot plug mechanism (Hot-Plu) of the selected expansion slot SL1 to SL4 is selected.
g Unit) The first control circuit CS1 transmits various hot plug control signals sequentially transmitted to the HPU1 to HPU4.

The second expansion slot selector SS2 is generated by the arithmetic processing unit CU and, based on the expansion slot selection information signal 31 sent, the hot plug mechanism HPU5 to HPU of the selected expansion slot SL5 to SL8.
8, various hot plug control signals sequentially transmitted by the control circuit CS2 are transmitted.

The hot plug mechanisms HPU1 to HPU8 are
The expansion slots SL1 to SL4 are connected to the bus B1 according to various hot plug control signals sequentially transmitted from the expansion slot selector SS1 and the expansion slot selector SS2.
Then, the expansion slots SL5 to SL8 are connected to the bus B2.

The first control circuit CS1 and the second control circuit CS2 are connected to the first bus B
A first bus master BM1 and a second bus master BM2 of the first bus B1 and the second bus B2, respectively.
, A bus use permission is obtained, and the bus is controlled by the first control circuit CS1 and the second control circuit CS2.
Are in the bus access waiting state, the hot plug mechanisms HPU1 to HPU1 selected by the expansion slot selection information signal.
HPU4 and hot plug mechanism HPU5 to HPU8
To the bus.

The hot plug mechanisms HPU1 to HPU8 are
Upon receiving connection signals from the first control circuit CS1 and the second control circuit CS2 to the first bus B1 and the second bus B2, respectively, the expansion slots SL1 to
SL8 simultaneously with the first bus B1 or the second bus B2
Connect to

The hot plug mechanisms HPU1 to HPU8 are:
Each time the sequentially executed processing is completed by the various hot plug control signals, the completion of each processing is notified to the status registers SR1 to SR8 corresponding to the expansion slots SL1 to SL8.

The arithmetic processing unit CU includes a status register S
R1 to SR8 are constantly monitored and the hot plug mechanism H
Upon confirming the connection completion notification from PU1 to HPU8,
"Instructions to add or remove expansion cards from expansion slots"
Is completed, and the completion of the instruction is reported to the hot plug driver.

[0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

FIG. 1 is a diagram showing the configuration of one embodiment of the present invention. In FIG. 1, the CU generates an instruction to add an expansion card to an expansion slot or an instruction to delete an expansion card, bus selection information and slot selection information, and transmits the instruction and information to a control register, a bus selector, and an expansion slot selector. It is an arithmetic processing unit.

B1 and B2 each have 4 expansion slots.
First and second buses having slots. BM1, BM
2 is a bus master of the first and second buses B1 and B2, respectively.

SL1 to SL4 and SL5 to SL8 are expansion slots on the first and second buses B1 and B2, respectively.

The signal 10 is a hot plug instruction signal for transmitting an expansion card addition instruction or an expansion card deletion instruction generated by the arithmetic processing unit CU to the control register. The signal 20 is a bus selection information signal for selecting a bus for executing a hot plug instruction generated by the arithmetic processing unit CU. The signals 30 and 31 are the expansion slots SL1 to SL3 for executing the hot plug instruction generated by the arithmetic processing unit CU.
This is an expansion slot selection information signal for selecting SL4, SL5 to SL8.

CR1 is a control register for storing an expansion card addition instruction or expansion card deletion instruction transmitted by the hot plug instruction signal 10 from the arithmetic processing unit CU.

BS1 is a bus selector which distributes the instruction of the control register CR1 to the first bus B1 or the second bus B2 according to the instruction of the bus selection information signal 20 transmitted from the arithmetic processing unit CU.

CS1 and CS2 are the first and second buses B
An instruction to add an expansion card or an instruction to delete an expansion card allocated to the first and second buses B1 and B2 is executed.
Generation of various control signals such as expansion slot connection control to B2, expansion slot power control, and reset control;
The first, which has functions of generating a bus request to the second buses B1 and B2 and monitoring the first and second buses B1 and B2,
This is a second control circuit.

SS1 and SS2 transmit various control signals generated by the first and second control circuits CS1 and CS2 according to the instruction of the slot selection information signal 30 and the slot selection information signal 31 transmitted from the arithmetic processing unit CU. These are first and second expansion slot selectors for distributing to expansion slots.

The HPU 1 to HPU 8 supply power to the expansion slot and the first and second buses B in accordance with various control signals generated by the first and second control circuits CS 1 and CS 2.
1, a hot plug mechanism that controls connection to B2 and reports the status to the hot plug controller each time.

SR1 to SR8 are status registers which hold the expansion slot hot plug status notified by the expansion slot hot plug mechanisms HPU1 to HPU8.

The signal 40 is a status monitor signal for the arithmetic processing unit CU to monitor the status of each expansion slot stored in the status registers SR1 to SR8.

The operation of one embodiment of the present invention will be described with reference to FIG.

In a system having a hot plug mechanism in an expansion slot, a hot plug driver (not shown)
When a command for adding an expansion card or deleting an expansion card is issued to the expansion slot hot plug controller HPC, the expansion slot / hot plug controller HPC
The processing unit CU in the above disassembles an expansion cardon addition instruction or an expansion card deletion instruction, adds an expansion card or deletes an expansion card, bus selection information for selecting a bus for issuing the instruction, and an expansion slot. Is generated, and these information (signals) are generated.
To the hot plug instruction signal 10, the bus selection information signal 20, and the expansion slot selection information signals 30, 31 respectively.
Send to

The expansion card addition instruction or expansion card deletion instruction transmitted from the arithmetic processing unit CU through the hot plug instruction signal 10 is stored in the control register CR1. Issues an addition instruction or an expansion card deletion instruction.

The bus selector BS1 selects a bus for executing a hot plug instruction based on the bus selection information generated by the arithmetic processing unit CU and transmitted by the bus selection information signal 20, and is extended by the control register CR1. The first and second control circuits C corresponding to the selected bus are instructed to add a card or delete an expansion card.
Issue to S1 and CS2.

First and second control circuits CS1, C
S2, upon receiving an expansion card addition instruction or expansion card deletion instruction issued by the bus selector BS1, the bus masters BM1, BM2 of the first and second buses B1, B2.
Issue a bus use request (REQ) to the bus master BM
1. Wait for a bus use permission (ACK) from BM2.

First and second control circuits CS1, C
When a bus use permission (ACK) is issued from the bus masters BM1 and BM2 to S2, the first and second control circuits CS1 and CS2 send the instruction generated by the arithmetic processing unit CU to add the expansion card. In the case of an instruction, a power ON instruction to the expansion slot, a reset instruction to the expansion slot, a clock ON instruction to the expansion slot, an instruction to connect a control signal of the expansion slot to the bus, An instruction to connect an address / data signal to the bus, an instruction to release a reset to an expansion slot, and various control signals required in a hot plug sequence are sequentially issued.

First and second control circuits CS1, C
In step S2, when the instruction generated by the arithmetic processing unit CU is an instruction to delete an expansion card, a reset instruction to the expansion slot; an instruction to disconnect the control signal / address / data signal of the expansion slot from the bus; Various control signals such as a power OFF instruction to the slot, a clock OFF instruction to the expansion slot, etc. are sequentially issued.

The first expansion slot selector SS1 and the second expansion slot selector SS2 transmit the slot selection information signal 30, the slot selection information signal 3 from the arithmetic processing unit CU.
1 hot plug mechanism H of the expansion slot selected by the expansion slot selection information transmitted respectively.
PU1 to HPU4 and HPU5 to HPU8 have a first control circuit CS1 and a second control circuit CS
2 sequentially issues various control signals sequentially issued.

Hot plug mechanisms HPU1 to HPU4,
The hot plug mechanisms HPU5 to HPU8 perform processing in accordance with various control signals sequentially issued from the first slot selector SS1 and the second slot selector SS2, respectively.

If the instruction generated by the arithmetic processing unit CU is an instruction to add an expansion card, the hot plug mechanism HP
The U1 to HPU8 start power supply to the expansion slot in response to a power-on instruction to the expansion slot, and at the same time, notify the status registers SR1 to SR8 that the power supply has started.

Next, in response to the Reset instruction, the reset signal of the expansion slot is asserted, and the reset assertion is notified to the status registers SR1 to SR8.

Next, in response to the clock ON instruction, the supply of the clock to the expansion slot is started, and the start of the clock supply is notified to the status registers SR1 to SR8.

Next, according to an instruction to connect the control signal of the expansion slot to the bus, only the control signal is connected to the bus, and the connection is notified to the status registers SR1 to SR8.

Next, according to the instruction to connect the address / data signal of the expansion slot to the bus, the address / data signal is connected to the bus, and the status registers SR1 to SR8 are connected.
Is notified of the connection completion of the address / data signal.

Finally, R in the expansion slot SL1
Release the eset signal and reset the status registers SR1 to SR
The reset completion and the connection completion of the expansion card are notified to R8.

In the case of an instruction to delete an expansion card, the hot plug mechanisms HPU1 to HPU8 issue a Reset instruction to
It asserts the Reset signal of the expansion slot and notifies the status registers SR1 to SR8 of the Reset assertion.

Next, in response to an instruction to disconnect the control signal / address / data signal of the expansion slot from the bus, the control signal / address / data signal is disconnected from the bus, and the status registers SR1 to SR8 are notified of the disconnection from the bus.

Next, in response to an instruction to turn off the power to the expansion slot, the power supply to the expansion slot is stopped, and at the same time, the status registers SR1 to SR8 are notified that the power supply has been stopped.

The status registers SR1 to SR8 hold the connection states of the expansion slots notified from the hot plug mechanisms HPU1 to HPU8, respectively.

The arithmetic processing unit CU operates during system operation.
When the status registers SR1 to SR8 are constantly monitored and the completion notification of the expansion card addition instruction or the expansion card deletion instruction is held in the status registers SR1 to SR8,
The completion of the expansion card addition instruction or expansion card deletion instruction is indicated by a hot plug driver (HPC not shown).
To the driver software that controls the

The bus selector BS1 can select a plurality of buses B1 and B2 at the same time.
2 is capable of selecting a plurality of expansion slots at the same time. Therefore, in one embodiment of the present invention, it is possible to simultaneously add and delete expansion cards to a plurality of expansion slots.

As described above, in one embodiment of the present invention, the hot plug controller HPC has one control register CR1 and one bus selector BS.
By providing the control circuits CS and the slot selectors SS by the number of buses, it is possible to execute the expansion slot / hot plug instruction without having the control register CR corresponding to the number of expansion slots and the control circuit CS. In addition, expansion slot hot plug instructions to multiple buses can be realized.

Next, a second embodiment of the present invention will be described. FIG. 2 is a diagram showing the configuration of the second embodiment of the present invention. In FIG. 2, the CU generates an instruction to add an expansion card to an expansion slot or an instruction to delete an expansion card, bus selection information and slot selection information, and transmits the instruction and information to a control register, a bus selector, and an expansion slot selector. It is an arithmetic processing unit.

B1 and B2 each have 4 expansion slots.
First and second buses having slots. BM1, BM
2 is a bus master of the first and second buses B1 and B2, respectively.

SL1 to SL4 and SL5 to SL8 are expansion slots on the first bus B1 and the second bus B2, respectively.

The signal 10 is a hot plug instruction signal for transmitting an expansion card addition instruction or expansion card deletion instruction generated by the arithmetic processing unit CU to the control register. The signal 30 is an expansion slot selection information signal for selecting the expansion slots SL1 to SL8 for executing the hot plug instruction generated by the arithmetic processing unit CU.

CR1 is a control register for storing an expansion card addition instruction or expansion card deletion instruction transmitted from the arithmetic processing unit CU by the hot plug instruction signal 10.

CS1 is a control circuit that executes an instruction to add an expansion card or delete an expansion card, and has a function of generating various control signals such as expansion slot connection control, expansion slot power control, and reset control.

SS1 distributes various control signals generated by the first control circuit CS1 and the second control circuit CS2 to expansion slots according to the instruction of the slot selection information signal 30 transmitted from the arithmetic processing unit CU. This is an expansion slot selector having a function of generating a bus request to the first bus B1 and the second bus B2 and a function of monitoring the first and second buses B1 and B2.

The HPU 1 to HPU 8 control the power supply of the expansion slot and the connection to the first and second buses B 1 and B 2 according to various control signals generated by the slot selector SS 1, and each time the status is indicated by a hot plug. This is a hot plug mechanism that reports to the controller.

Reference numerals SR1 to SR8 denote status registers which hold expansion slot hot plug statuses notified by the expansion slot hot plug mechanisms HPU1 to HPU8.

The signal 40 is a status monitor signal for the arithmetic processing unit CU to monitor the status of each expansion slot stored in the status registers SR1 to SR8.

The arithmetic control unit CU generates an instruction or an instruction to add an expansion card to the expansion slot, and transmits it to the HPC together with the bus information and the slot information.

In the second embodiment of the present invention, the output of the control circuit CS1 is distributed to the expansion slots via the slot selector SS1, and compared with the configuration of the embodiment shown in FIG. The selector BS1 and the second
The control circuit CS2 is omitted, and the amount of hardware can be reduced while having a function substantially equivalent to that of the above-described embodiment.

[0082]

As described above, according to the present invention, the following effects can be obtained.

The first effect of the present invention is that the performance can be prevented from deteriorating when an expansion card is added or deleted.

The reason is as follows. Conventionally, in systems with expansion slot / hot plug functions, when adding / deleting expansion cards to multiple expansion slots,
It is necessary to process the hot plug command for each expansion slot.
Since the hot plug controller puts the bus in a standby state, the transfer speed of the bus was reduced. On the other hand, in the present invention, it becomes possible to simultaneously process the hot plug commands for all the expansion slots, and it is possible to minimize the time during which the bus is in the standby state by the hot plug commands ( By simultaneously processing a plurality of expansion slots, the bus standby state can be suppressed at one time.)
This is because a decrease in transfer performance can be prevented.

A second advantage of the present invention is that the amount of hardware of the expansion slot / hot plug controller can be reduced.

The reason is as follows. Conventionally, in a system having a plurality of buses, it is necessary to provide an expansion slot / hot plug controller for a plurality of buses.
Furthermore, it was necessary to have a control register and a control circuit for the expansion slot in the expansion slot hot plug controller. However, in the present invention, a bus selector and an expansion slot selector are provided in the expansion slot / hot plug controller. This is because the number of control registers and control circuits conventionally provided for each expansion slot can be reduced, and the circuit configuration can be simplified. Further, according to the present invention, by integrating a plurality of controllers into one, the amount of hardware can be reduced and high integration can be achieved. Furthermore, according to the present invention, the number of bus selectors and control circuits is reduced, and the circuit configuration is simplified.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an expansion slot / hot plug controller according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an expansion slot / hot plug controller according to another embodiment of the present invention.

[Explanation of symbols]

B1 first bus B2 second bus BM1 bus master of bus B1 BM2 bus master of bus B2 BS bus selector CR1 control register CS1 control circuit for bus B1 control circuit for CS2 bus B2 CU operation processing unit HPC expansion slot hot plug Controllers HPU1 to HPU8 Hot plug mechanism for expansion slots SL1 to SL8 SL1 to SL4 Hot plug compatible expansion slots connected to bus B1 SL5 to SL8 Hot plug compatible expansion slots connected to bus B2 SR1 to SR8 Expansion slots 1 to 8 Status register SS1 Expansion slot selector for bus B1 SS2 Expansion slot selector for bus B2 10 Hot plug instruction signal 20 Bus selection information signal 30 Expansion slot selection information signal 31 expansion slot selection information signal 40 expansion slot status information

Claims (13)

[Claims] 1. An arithmetic processing unit that receives an input hot plug instruction and decomposes the instruction into an instruction to be executed inside the apparatus, and outputs the instruction, and a control that holds an instruction to add or delete an expansion card output from the arithmetic processing unit. A register and an instruction held in the control register.
A control circuit for generating a predetermined control signal according to a hot plug sequence and sequentially transmitting the control signal; and a hot plug for connecting an expansion slot to a bus or disconnecting the expansion slot from the bus by the control signal generated by the control circuit. And a status register for holding a state of the hot plug mechanism. Each time the hot plug mechanism executes a control signal sequentially transmitted from the control circuit, the hot plug mechanism notifies the status of the hot plug mechanism. A hot plug control device for an expansion slot, wherein the status is stored in the status register. 2. The computer according to claim 1, further comprising: one of the control registers for holding an instruction to add or delete an expansion card output from the arithmetic processing unit, and bus selection information output from the arithmetic processing unit among a plurality of buses. A bus selector for selecting a bus that executes the instruction held in the control register, based on the instruction held in the control register,
A plurality of the control circuits for generating and sequentially transmitting the control signal are provided corresponding to each of the plurality of buses, and are generated and sequentially generated by the control circuit based on expansion slot selection information output from the arithmetic processing unit. 2. The device according to claim 1, further comprising a plurality of slot selectors for distributing the transmitted control signal to a selected expansion slot of a selected bus, corresponding to each of the plurality of buses. Expansion slot hot plug controller. 3. The apparatus according to claim 1, further comprising a control register for holding an expansion card addition instruction or a deletion instruction output from the arithmetic processing unit, the control signal being generated based on the instruction held in the control register, and sequentially transmitted. A slot selector for distributing the control signals generated by the control circuit and sequentially transmitted to the selected expansion slot based on the expansion slot selection information output from the arithmetic processing unit. The expansion slot hot plug control device according to claim 1, comprising: 4. A bus, comprising: a plurality of buses; an expansion slot connected to the bus and capable of being hot-plugged; and a hot-plug mechanism for connecting the expansion slot to the bus, when adding or deleting an expansion card. The expansion slot / hot plug controller that controls the power supply to the expansion slot, controls the connection to the bus, and controls the clock and reset signals receives the hot plug command, and receives an instruction to add or delete an expansion card from the command. , Bus selection information, and expansion slot selection information, an arithmetic processing unit that decomposes and outputs the information, a status register that stores and holds the states of the hot plug mechanisms of the plurality of buses, and an instruction that is output from the arithmetic processing unit And a bus designated by a bus selection information signal output from the arithmetic processing unit. And a bus selector for outputting the hot plug instruction output from the control register to the selected bus; and a bus selector provided corresponding to each of the plurality of buses, to the bus output from the bus selector. A plurality of control circuits for generating and sequentially transmitting a control signal according to a hot plug sequence from a hot plug instruction; and expansion slot selection information provided corresponding to each of the plurality of buses and output from the arithmetic processing unit By a signal, select an expansion slot to execute a hot plug instruction, the control signal sequentially transmitted from the control circuit, a plurality of expansion slot selector to transmit to the hot plug mechanism of the selected expansion slot, An expansion slot hot plug control device, comprising: 5. The bus selector according to claim 1, wherein a plurality of buses are simultaneously selectable, and said plurality of expansion slots are selectable at the same time in said expansion slot selector. Item 5. An expansion slot hot plug control device according to item 4. 6. When the expansion slot / hot plug controller receives a command to “add or delete an expansion card to / from an expansion slot”, the arithmetic processing unit in the expansion slot / hot plug controller decodes this command. To generate an instruction to add an expansion card or an instruction to delete an expansion card, bus selection information to select a bus, and expansion slot selection information to select an expansion slot, and generate an expansion card. An instruction to add or delete an expansion card is transmitted as a hot plug instruction signal, the bus selection information is transmitted by a bus selection information signal, and the expansion slot selection information is transmitted by an expansion slot selection information signal, The control register stores the “extension card” transmitted as the hot plug instruction signal from the arithmetic processing unit. The bus selector inputs the bus selection information signal sent from the arithmetic processing unit as a selection control signal, and stores the expansion card Select the bus to be added or deleted, and select "Add expansion card" stored in the control register.
An instruction or an instruction to “delete an expansion card” is sent to the control circuit corresponding to the selected bus, and an instruction to “add an expansion card” or an instruction to “delete an expansion card” is sent from the bus selector. In response to the instruction, the control circuit sequentially generates a hot plug control signal required for execution of the instruction according to the instruction, and sends the generated hot plug control signal to the expansion slot selector corresponding to the selected bus. The expansion slot select receives the expansion slot selection information signal transmitted from the arithmetic processing unit as a selection control signal, and sequentially transmits the selected expansion slot hot plug mechanism from the control circuit to the hot plug mechanism of the selected expansion slot. The expansion slot hot according to claim 4, wherein the hot plug control signal is transmitted. Lag controller. 7. A bus, comprising: a plurality of buses; a hot-pluggable expansion slot connected to each of the buses; and a hot-plug mechanism for connecting the expansion slot to the bus. The expansion slot / hot plug controller, which controls the power supply to the expansion slot, controls the connection to the bus, and controls signals related to clock and reset, receives the hot plug instruction, and receives an instruction to add or delete an expansion card from the instruction. , Bus selection information, and expansion slot selection information, an arithmetic processing unit that decomposes and outputs the information, a status register that stores and holds the states of the hot plug mechanisms of the plurality of buses, and an instruction from the arithmetic processing unit. A control register to perform the hot plug sequence According to generates a control signal, a control circuit which sequentially transmitted, provided in common to said plurality of buses, on the basis of the expansion slot selection information signal outputted from said arithmetic processing unit,
An expansion slot selector for selecting an expansion slot for executing a hot plug instruction, and transmitting the control signal sequentially transmitted from the control circuit to a hot plug mechanism of the selected expansion slot. Characterized by an expansion slot hot plug controller. 8. The expansion slot hot plug control device according to claim 7, wherein a plurality of expansion slots can be simultaneously selected in said expansion slot selector. 9. When the expansion slot / hot plug controller receives a command to “add or delete an expansion card to / from an expansion slot”, the arithmetic processing unit in the expansion slot / hot plug controller decodes the command. Then, an “add expansion card” instruction or “delete expansion card” instruction and slot expansion selection information for selecting an expansion slot are generated, and an “add expansion card” instruction or “expansion card” is generated. Is transmitted as a hot plug instruction signal, and expansion slot selection information for selecting an expansion slot is transmitted by an expansion slot selection information signal. The control register is transmitted from the arithmetic processing unit as the hot plug instruction signal. The "Add expansion card" instruction or the "Delete expansion card" instruction. The control circuit that receives the instruction to “add an expansion card” or the instruction to “delete an expansion card” is required to execute the instruction according to the instruction and according to a bus protocol. A hot plug control signal is sequentially generated and sent to the expansion slot selector. The expansion slot select inputs an expansion slot selection information signal output from the arithmetic processing device as a selection control signal, and outputs the selected expansion slot. 8. The expansion slot hot plug control device according to claim 7, wherein said control circuit transmits a hot plug control signal sequentially transmitted to said hot plug mechanism. 10. The hot plug mechanism connects the expansion slot to a bus according to the hot plug control signal sequentially transmitted from the expansion slot selector, and the control circuit has a bus access function. The bus master of each bus obtains a bus use permission, and when the bus is in a bus access waiting state of the control circuit, the hot plug mechanism selected by the expansion slot selection information signal is Issue a connection instruction to the bus, and the hot plug mechanism receives a connection signal to each bus from the control circuit, and simultaneously connects a plurality of expansion slots to the bus. ,
The expansion slot hot plug control device according to claim 6 or 9. 11. The hot plug mechanism notifies a status of the hot plug mechanism every time a hot plug control signal sequentially transmitted from the control circuit is executed,
10. The expansion slot hot plug control device according to claim 6, wherein the status of the hot plug mechanism is stored in the status register. 12. The hot plug mechanism according to claim 1, wherein each time a process sequentially executed is completed by a hot plug control signal,
In the status register corresponding to each expansion slot,
Notifying the completion of each process, the arithmetic processing unit monitors the status register,
When you confirm the connection completion notification from the hot plug mechanism,
The method according to claim 10, further comprising: recognizing that the “add or remove an expansion card to the expansion slot” command has been completed, and reporting the completion of the command to a host system of the expansion slot / hot plug controller. Expansion slot hot plug controller. 13. The system according to claim 13, wherein the hot plug command is issued from a host system of the expansion slot / hot plug controller.
The expansion slot hot plug control device according to claim 1, wherein the expansion slot hot plug control device is supplied to the arithmetic processing unit of the expansion slot hot plug controller.