CN101079019A - Bridge and data clearing method of electronic system - Google Patents
Bridge and data clearing method of electronic system Download PDFInfo
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- CN101079019A CN101079019A CN 200710143702 CN200710143702A CN101079019A CN 101079019 A CN101079019 A CN 101079019A CN 200710143702 CN200710143702 CN 200710143702 CN 200710143702 A CN200710143702 A CN 200710143702A CN 101079019 A CN101079019 A CN 101079019A
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Abstract
The invention discloses a bridge and data clearing method of electronic system, which is characterized by the following: comprising a first master control element, a buffer unit and a clear demand control circuit; outputting a clear demand with the first host control element; setting the buffer unit as a plurality of buffer; receiving the clear demand; detecting empty of a plurality of buffer; recording the empty buffer; outputting a clear assured signal to the first host control element. This invention can put data and or order to the buffer unit, which can improve the performance of the system effectively.
Description
Technical field
The present invention particularly can avoid the inconsistent data clearing method that usefulness is reduced of data relevant for a kind of relevant for a kind of data clearing method.
Background technology
Many computer systems are used at least two buses, article one, be commonly referred to memory bus (memory bus) and be used for communication between central processing unit (central processor) and primary memory (main memory), and second is generally peripheral bus (peripheral bus) and is used for communication between peripherals (for example graphics system, disc driver or LAN (Local Area Network)).For data can be transmitted between these two buses, can use a bridge (bridge) that these two buses are linked together usually.
The groundwork of bridge is that data are sent to another bus from a bus.In order to reach this function, bridge must have the ability (slavecapacity) of subordinate element and the ability (master capacity) of main element, make it can be used as the requirement of subordinate element reception, be re-used as a main element afterwards and on another bus, carry out suitable bus operation from a bus.Therefore, bridge must have the ability to provide by the access action of a bus to another bus.
Generally speaking, bridge can with from the data that are about to be transmitted on system bus or the peripheral bus temporary (or be called paste posted) in a data buffer.Temporal data can improve the usefulness of system by packetized data and prefetch data in bridge.Yet when synchronous processing incident (synchronization event) took place, data also are temporary in will produce the inconsistent problem of data in the bridge.
Summary of the invention
The invention provides a kind of bridge, comprise one first master element, in order to export a cleaning requirement; One buffer cell comprises a plurality of impact dampers; And one cleaning require control circuit, in receiving cleaning when requiring, whether detect a plurality of impact dampers empties, and note the impact damper that has emptied in a plurality of impact dampers, if a plurality of impact dampers were cleared after cleaning requires all in receiving, confirmation signal is finished in output one cleaning, is cleared to inform the above-mentioned buffer cell of first master element.
The present invention provides a kind of data scrubbing (flush) method of electronic system again, comprise when a cleaning of one first master element requires in receiving from a bridge, detect whether a plurality of impact dampers are cleared in the buffer cell, and note the impact damper that has been cleared in a plurality of impact dampers; And be cleared all after requiring time a time in receiving cleaning when a plurality of impact dampers, output one is cleared up and is finished confirmation signal to the first master element.
The data clearing method of bridge of the present invention and electronic system, the subordinate element can not require to interrupt receiving the processing requirements from master element in the peripherals because of the cleaning that master element sends, can continue data and/or instruction are put into buffer cell, make the usefulness of system effectively promote.
Description of drawings
Fig. 1 is an embodiment of an electronic system.
Fig. 2 requires an embodiment of control circuit for a cleaning among the present invention.
Fig. 3 requires the circuit structure diagram of control circuit for cleaning among Fig. 2.
Fig. 4 requires the signal timing diagram of control circuit for cleaning among Fig. 3.
Fig. 5 requires another circuit structure diagram of control circuit for cleaning among Fig. 2.
Fig. 6 requires the signal timing diagram of control circuit for cleaning among Fig. 5.
Fig. 7 is another embodiment of electronic system of the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, a preferred embodiment cited below particularly, and cooperate appended diagram, be described in detail below.
Fig. 1 is an embodiment of an electronic system.As shown in the figure, electronic system 100 can be implemented in the computer system, but is not limited to this, can also be implemented in digital camera, digital recorder shadow machine, consumption electronic products, device for mobile communication, portable electronic product or the robot.Electronic system 100 comprises a master element MA, a subordinate element SA, a bridge 10 and a peripherals 20.For example, master element MA can be a central processing unit (CPU), subordinate element SA can be the memory cache in a system storage or the central processing unit, and peripherals 20 can be a Peripheral Component Interconnect (peripheral component interface; PCI) equipment, but be not limited to this.Bridge 10 comprises master element MB and MC, subordinate element SB and SC and buffer cell BF1 and BF2, and peripherals 20 comprises master element MD and subordinate element SD.Each buffer cell BF1 and BF2 comprise one or more impact dampers.
When master element MA required the subordinate element SD of access peripherals 20, subordinate element SB can receive from the processing requirements (transactionrequests) of master element MA and put into (push) buffer cell BF1.Master element MC can carry out the processing requirements that subordinate element SB is put among the buffer cell BF1, makes subordinate element SD accept this processing requirements.Anti-speech, when the master element MD in the peripherals 20 required access subordinate element SA, subordinate element SC can receive the processing requirements (transaction requests) from master element MD and put into (push) buffer cell BF2.Master element MB can carry out the processing requirements that subordinate element SC is put among the buffer cell BF2, makes subordinate element SA accept this processing requirements.Generally speaking, be called downlink processing (downstreamtransaction) to the processing requirements of subordinate element SD, and be called up processing (upstream transaction) to the processing requirements of subordinate element SA by master element MD by master element MA.
In some cases, before the processing requirements of certain direction (upstream or downstream) was finished, the processing requirements of other direction must be finished earlier, so that keep the order of processing requirements, to avoid taking place the consistency problem of data.
For example, finish one when peripherals 20 and write processing requirements, and send a look-at-me and give master element MA (for example CPU), notice can read one and write data in subordinate element SA (for example system storage).Before this pen in handling subordinate element SA write data, master element MA can send one to subordinate element SD and read request, to check the state of peripherals 20.The request of reading that master element MA sends to subordinate element SD is a synchronous event, thereby bridge 10 can stop receiving the new processing request that master element MD sends this moment, and removes data among the buffer cell BF2 to guarantee the consistance of data.In other words, master element MA can read the state of subordinate element SD earlier, and before reason required to finish herein, bridge 10 must confirm that this pen writes data and put into subordinate element SA.Maybe the data that read are returned to before the master element MA before the subordinate element SD reading of data, bridge 10 will produce a cleaning (flush) and require flush_req to give subordinate element SC, and waits for that subordinate element SC replys a cleaning and finishes confirmation signal (flush acknowledge) flush_ack and represent that this pen writes data and put into subordinate element SA.
Yet, receive cleaning when requiring flush_req in subordinate element SC, to can not put into buffer cell BF2 to data or instruction again, promptly subordinate element SC will decommission, and make outside main control unit send (retry) processing requirements again or send waiting status.Cleaning is finished confirmation signal (flush acknowledge) flush_ack and just can be sent after will all processing requirements empty in buffer cell BF2.Clear up when requiring flush_req owing to receive, will stop to receive processing requirements, so the usefulness of system will reduce.
For the usefulness of elevator system, the present invention also provides other embodiment.Fig. 2 requires an embodiment of control circuit for a cleaning among the present invention.Cleaning requires control circuit 12 can be arranged within the bridge 10, in receiving cleaning when requiring flush_req, n impact damper among the detecting buffer cell BF2 (BF20～BF22) whether empty for example, and note the impact damper that has emptied in n the impact damper.If n impact damper emptied once after cleaning requires flush_req all in receiving, then export a cleaning and finish confirmation signal flush_ack to master element MC.For example, cleaning requires control circuit 12 can be integrated among the subordinate element SC of Fig. 1, also can be arranged between main control unit MC, subordinate element SC and the buffer cell BF2, but be not limited to this.
As shown in Figure 2, cleaning requires control circuit 12 to comprise detecting unit 121,122 and 123 and output unit 124.Detecting unit 121,122 and 123 is in receiving cleaning from master element MC when requiring flush_req, and whether corresponding buffers BF20, BF21 and BF22 are cleared among the detecting buffer cell BF2.Detecting unit 121 comprises a working storage RG0 and a processing unit 125, and detecting unit 122 comprises a working storage RG1 and a processing unit 126, and detecting unit 123 comprises a working storage RG2 and a processing unit 127.
For example, when (move) read or taken out of to all stored among impact damper BF20, BF21 and BF22 instructions or data by main control unit MB, impact damper BF20, BF21 and BF22 promptly are regarded as emptying (idled, empty or flushed), and idle signal idle_0, idle_1 and the idle_2 of impact damper BF20, BF21 and BF22 can be set to noble potential at this moment.When detecting unit 121 detects idle signal idle_0 when being set to noble potential, can learn that impact damper BF20 is cleared.Similarly, when detecting unit 122 and 123 detects idle signal idle_1 and idle_2 when being set to noble potential, can learn that impact damper BF21 and BF22 are cleared.
Under most situation, impact damper BF20, BF21 and BF22 can not be in idle state just simultaneously, thereby receive impact damper BF20 as working storage RG0～RG2 in the present embodiment, the idle signal idle_0 of the noble potential of BF21 and BF22, idle_1, during idle_2, can keep in received idle signal idle_0, idle_1, idle_2 and produce a correspondence empty signal pending_ack0, pending_ack1, pending_ack2 is so that note pairing impact damper BF20, BF21 and BF22 were cleared after requiring flush_ack receiving cleaning.At this moment, the impact damper that has been cleared promptly is allowed to receive again subordinate element SC according to data that processing requirements write or instruction from master element MD.For example, when working storage RG0 receives the idle signal idle_0 with noble potential, can keep in idle signal idle_0, and produce a noble potential constantly empty signal pending_ack0 be cleared so that note impact damper BF20.At this moment, bridge 10 can allow subordinate element SC according to the processing requirements from master element MD, and the data or the instruction of correspondence write the impact damper BF20 that has emptied.If emptying signal pending_ack0 is noble potential, processing unit 125 can be exported definite signal ack0 that emptied of a noble potential.Similarly, when working storage RG 1 receives the idle signal idle_1 with noble potential, can temporary idle signal idle_1 and produce a noble potential constantly empty signal pending_ack1, so that noting impact damper BF21 is cleared, and bridge 10 can allow subordinate element SC according to the processing requirements from master element MD, and the data or the instruction of correspondence write the impact damper BF21 that has emptied.Because emptying signal pending_ack1 is noble potential, processing unit 126 can be exported definite signal ack1 that emptied of a noble potential.The action of working storage RG2 and working storage RG0～RG1 are not repeated similar in appearance to this.
If impact damper BF20, BF21 and BF22 had emptied once after cleaning requires flush_req all in receiving, output unit 124 output cleanings are finished confirmation signal flush_ack to master element MC.If impact damper BF20, BF21 and BF22 had emptied once after cleaning requires flush_req all in receiving, be that idle signal idle_0, idle_1 and idle_2 all once were set to noble potential, output unit 124 can determine that having emptied signal ack0, ack1 finishes confirmation signal flush_ack with ack2 output cleaning according to what receive, clears up the data of being stored before requiring flush_req and all is cleared receiving with expression buffer cell BF2.
Because after impact damper BF20, BF21 or BF22 are recorded and empty, bridge 10 allows impact damper BF20, BF21 and BF22 to receive from the new data of subordinate element SC or instruction newly, even require flush_req so receive the cleaning of master element MC, subordinate element SC needn't interrupt receiving the processing requirements from master element MD, and continue data and/or instruction are put into the impact damper that (push) buffer cell BF2 had been cleared, make the usefulness of system effectively to promote.
Fig. 3 requires another embodiment of control circuit for a cleaning among the present invention.As shown in the figure, cleaning require control circuit 13 to comprise detecting unit 121～123 and serve as output unit 124 with door AD4.Similarly, cleaning requires control circuit 13 can be integrated among the subordinate element SC of Fig. 1, also can be arranged between main control unit MC, subordinate element SC and the buffer cell BF2.
Detecting unit 121 constitute working storage RG0 shown in Figure 2 with door AD1, D flip-flop DF0 and multiplexer MUX0～MUX1, with door AN1 with or door OG1 constitute processing unit 125 shown in Figure 2.Have idle signal idle_0 and the cleaning that two input ends couple impact damper BF20 among the buffer cell BF2 respectively with door AD1 and require flush_req, and an output terminal couples multiplexer MUX1.Multiplexer MUX0 has output terminal and the data " 0 " (be electronegative potential) of two input ends in order to be coupled to D flip-flop DF0 respectively.Multiplexer MUX1 has output terminal and the data " 1 " (being noble potential) that two input ends are coupled to multiplexer MUX0 respectively, and an output terminal is coupled to D flip-flop DF0.D flip-flop DF0 has the output terminal that input end is coupled to multiplexer MUX1, and a clock pulse input end is coupled to a clock pulse signal CLK1, and output terminal output emptied signal pending_ack0 to the input end of door AN1 and multiplexer MUX0.Be coupled to cleaning with another input end of door AN1 and require flush_ack.Or door OG1 have two input ends be coupled to respectively with the door output terminal of AN1 and buffer cell BF2 in the idle signal idle_0 of impact damper BF20, and an output terminal in order to export determine to have emptied signal ack0 to door AD4.Detecting unit 122 and 123 circuit structure are identical with detecting unit 122, thereby repeat no more.
Cleaning requires action reference Fig. 4 of control circuit 13 to be described as follows.Receiving after cleaning from master element MC requires flush_req, when receiving the idle signal idle_0 that represents the noble potential that impact damper BF20 has been cleared, D flip-flop DF0 can export have a noble potential empty signal pending_ack0.For example, when cleaning requires flush_req and idle signal idle_0 to be all noble potential, can become noble potential by electronegative potential with the output terminal of door AD1, make the signal (being data " 1 ") of noble potential to export D flip-flop DF0 to by multiplexer MUX1, so the output terminal of D flip-flop DF0 can become noble potential (i.e. output has emptied signal pending_ack0) by electronegative potential, is cleared with the expression corresponding buffers.What simultaneously, have a noble potential empties the input end that signal pending_ack0 also can be coupled to MUX1 by multiplexer MUX0.Because the control end of multiplexer MUX0 is connected to the cleaning of noble potential and requires flush_req, thereby two input ends of multiplexer MUX1 are all noble potential at this moment, so with the output of door AD1 why, the output terminal of D flip-flop DF0 (having emptied signal pending_ack0) all can maintain noble potential.In other words, cleaning require control circuit 13 record buffer BF20 be cleared after requiring flush_req in receiving cleaning.Therefore, even idle signal idle_0 is put into (push) data owing to impact damper BF20 by subordinate element SC or instruction becomes electronegative potential, the emptying signal pending_ack0 and still can maintain noble potential of D flip-flop DF1 output, make with a door AN1 export a high potential signal to or door OG1, and then make or door OG1 continues the output noble potential determines to have emptied signal ack0.
Similarly, when receiving the idle signal idle_2 that represents the noble potential that impact damper BF22 has been cleared, D flip-flop DF2 can export have a noble potential empty signal pending_ack2, the expression cleaning require control circuit 13 record buffer BF22 be cleared after cleaning requires flush_req in receiving.Therefore, even idle signal idle_2 is put into (push) data owing to impact damper BF22 by subordinate element SC or instruction becomes electronegative potential, the output terminal of D flip-flop DF2 still can maintain noble potential (having emptied signal pending_ack2), makes or the lasting definite signal ack2 that emptied that exports a noble potential of door OG3.
When receiving the idle signal idle_1 of noble potential, represent that promptly impact damper BF21 is cleared.This moment, respective signal ack0 and ack2 and idle signal idle_1 were all noble potential, be that all impact damper BF20～BF22 among the buffer cell BF2 all were cleared after requiring flush_req in receiving cleaning, therefore the output terminal with door AD4 can become noble potential (the output cleaning is finished confirmation signal flush_ack to master element MC) by electronegative potential.After cleaning is finished confirmation signal flush_ack and become noble potential, emptied signal pending_ack0～pending_ack2 and be eliminated at next cycle.For instance, be noble potential if confirmation signal flush_ack is finished in cleaning, then cleaning requires flush_req can be changed to electronegative potential, makes multiplexer MUX0 export the signal of an electronegative potential (being data 0) to multiplexer MUX1.Because this moment, the output terminal with door AD1 and multiplexer MUX0 was electronegative potential, the data 0 of multiplexer MUX1 output electronegative potential are to D flip-flop DF0, so the signal pending_ack0 that empties of D flip-flop DF0 output becomes electronegative potential by noble potential.In present embodiment, owing to empty signal pending_ack0～pending_ack2 and can be eliminated, thereby be provided with to prevent to clear up and require the cleaning of circuit 13 output errors to finish confirmation signal flush_ack with an AN1 at the next cycle that cleaning requires flush_req to become electronegative potential.
Fig. 5 requires another embodiment of control circuit for a cleaning among the present invention.As shown in the figure, cleaning require control circuit 14 comprise phase inverter INV0～INV2, with door AD1～AD4, a multiplexer MUX0～MUX5, trigger DF0～DF2 and or door OG4～OG6.Similarly, cleaning requires control circuit 14 can be integrated among the subordinate element SC of Fig. 1, also can be arranged between main control unit MC, subordinate element SC and the buffer cell BF2.For example, phase inverter INV0, with door AD1, a multiplexer MUX0～MUX1, trigger DF0 and or a door OG4 can constitute detecting unit shown in Figure 2 121; Phase inverter INV1, with door AD2, a multiplexer MUX2～MUX3, trigger DF1 and or a door OG5 can constitute detecting unit shown in Figure 2 122; Phase inverter INV2, with door AD3, a multiplexer MUX4～MUX5, trigger DF2 and or a door OG6 can constitute detecting unit shown in Figure 2 123.Can regard output unit shown in Figure 2 124 as with door AD4.
Have idle signal idle_0 and the cleaning that three input ends couple impact damper BF20 in the output terminal, buffer cell BF2 of phase inverter INV0 respectively with door AD1 and require flush_req, and an output terminal couples multiplexer MUX1.Multiplexer MUX0 has output terminal and the data " 0 " (be electronegative potential) of two input ends in order to be coupled to D flip-flop DF0 respectively.Multiplexer MUX1 has output terminal and the data " 1 " (being noble potential) that two input ends are coupled to multiplexer MUX0 respectively, and an output terminal is coupled to D flip-flop DF0.D flip-flop DF0 has the output terminal that input end is coupled to multiplexer MUX1, and a clock pulse input end is coupled to a clock pulse signal CLK1, and an output terminal is coupled to or the input end of door OG4 and multiplexer MUX0.
Have idle signal idle_1 and the cleaning that three input ends couple impact damper BF21 in the output terminal, buffer cell BF2 of phase inverter INV1 respectively with door AD2 and require flush_req, and an output terminal couples multiplexer MUX3.Multiplexer MUX2 has output terminal and the data " 0 " (be electronegative potential) of two input ends in order to be coupled to D flip-flop DF1 respectively.Multiplexer MUX3 has output terminal and the data " 1 " (being noble potential) that two input ends are coupled to multiplexer MUX2 respectively, and an output terminal is coupled to D flip-flop DF1.D flip-flop DF1 has the output terminal that input end is coupled to multiplexer MUX3, and a clock pulse input end is coupled to a clock pulse signal CLK1, and an output terminal is coupled to or the input end of door OG5 and multiplexer MUX2.
Have idle signal idle_2 and the cleaning that three input ends couple impact damper BF22 in the output terminal, buffer cell BF2 of phase inverter INV2 respectively with door AD3 and require flush_req, and an output terminal couples multiplexer MUX5.Multiplexer MUX4 has output terminal and the data " 0 " (be electronegative potential) of two input ends in order to be coupled to D flip-flop DF2 respectively.Multiplexer MUX5 has output terminal and the data " 1 " (being noble potential) that two input ends are coupled to multiplexer MUX4 respectively, and an output terminal is coupled to D flip-flop DF2.D flip-flop DF2 has the output terminal that input end is coupled to multiplexer MUX5, and a clock pulse input end is coupled to a clock pulse signal CLK1, and an output terminal is coupled to or the input end of door OG6 and multiplexer MUX4.
Or door OG4 has the idle signal idle_0 that two input ends are coupled to impact damper BF20 among the output terminal of D flip-flop DF0 and the buffer cell BF2 respectively.Or door OG5 has the idle signal idle_1 that two input ends are coupled to impact damper BF21 among the output terminal of D flip-flop DF1 and the buffer cell BF2 respectively.Or door OG6 has the idle signal idle_2 that two input ends are coupled to impact damper BF22 among the output terminal of D flip-flop DF2 and the buffer cell BF2 respectively.Have that three input ends are coupled to respectively or the input end of door OG4, OG5 and OG6 with door AD4, and an output terminal is coupled to the input end of phase inverter INV0～INV2.
Cleaning requires action reference Fig. 6 of control circuit 14 to be described as follows.Receiving after cleaning from master element MC requires flush_req, when receiving the idle signal idle_0 that represents the noble potential that impact damper BF20 has been cleared, D flip-flop DF0 can export have a noble potential empty signal pending_ack0.For example, because finishing confirmation signal flush_ack, cleaning still is electronegative potential (is notasserted) at this moment, so the output terminal of phase inverter INV0 is a noble potential.Therefore, when cleaning requires flush_req and idle signal idle_0 to be all noble potential, can become noble potential by electronegative potential with the output terminal of door AD1, make the signal (being data " 1 ") of noble potential to export D flip-flop DF0 to by multiplexer MUX1, so the output terminal of D flip-flop DF0 can become noble potential (i.e. output has emptied signal pending_ack0) by electronegative potential, is cleared with the expression corresponding buffers.What simultaneously, have a noble potential empties the input end that signal pending_ack0 also can be coupled to MUX1 by multiplexer MUX0.
Because two input ends of multiplexer MUX1 are all noble potential, thus with the output of door AD1 why, the output terminal of D flip-flop DF1 (having emptied signal pending_ack0) all can maintain noble potential.In other words, cleaning require control circuit 14 record buffer BF20 be cleared after requiring flush_req in receiving cleaning.
Therefore, even idle signal idle_0 is put into (push) data owing to impact damper BF20 by subordinate element SC or instruction becomes electronegative potential, the emptying signal pending_ack0 and still can maintain noble potential of D flip-flop DF0 output makes or door OG4 continues output one noble potential determines to have emptied signal ack0.
Similarly, when receiving the idle signal idle_2 that represents the noble potential that impact damper BF22 has been cleared, D flip-flop DF2 can export have a noble potential empty signal pending_ack2, the expression cleaning require control circuit 14 record buffer BF22 be cleared after cleaning requires flush_req in receiving.Therefore, even idle signal idle_2 is put into (push) data owing to impact damper BF22 by subordinate element SC or instruction becomes electronegative potential, the output terminal of D flip-flop DF2 still can maintain noble potential (having emptied signal pending_ack2), makes or the lasting definite signal ack2 that emptied that exports a noble potential of door OG6.
When receiving the idle signal idle_1 of noble potential, represent that promptly impact damper BF21 is cleared.This moment, respective signal ack0 and ack2 and idle signal idle_1 were all noble potential, be that all impact damper BF20～BF22 among the buffer cell BF2 all were cleared after requiring flush_req in receiving cleaning, therefore the output terminal with door AD4 can become noble potential (the output cleaning is finished confirmation signal flush_ack to master element MC) by electronegative potential.After cleaning is finished confirmation signal flush_ack and become noble potential, emptied signal pending_ack0～pending_ack2 and be eliminated.For instance, if it is noble potential that confirmation signal flush_ack is finished in cleaning, be electronegative potential with the output terminal of door AD1 and multiplexer MUX0, make the data of multiplexer MUX1 output electronegative potential to D flip-flop DF0, so the signal pending_ack0 that empties that D flip-flop DF0 exports is eliminated (becoming electronegative potential by noble potential).
In fact, the cleaning among Fig. 5 requires control circuit 14 can not comprise phase inverter INV0～INV2, promptly only comprises two output terminals with door AD1～AD3, receives cleaning respectively and requires flush_req and corresponding idle signal idle0～idle2.Yet, finishing confirmation signal flush_ack in cleaning is noble potential and idle signal and cleaning when requiring flush_req to be noble potential, and multiplexer (for example MUX1) will be according to carrying out unnecessary operation with the output signal of door (AD1) with corresponding D D-flip flop (DF0).For preventing that this situation from taking place, and can set by master element MC: if confirmation signal flush_ack is finished in cleaning is noble potential, makes cleaning require signal flush_req to remain electronegative potential.
Even the cleaning that subordinate element SC receives master element MC in the present embodiment requires flush_req, needn't interrupt receiving processing requirements from master element MD, and can continue data and/or instruction are put into the impact damper that (push) buffer cell BF2 had been cleared, so the usefulness of system will effectively promote.
Fig. 7 is another embodiment of electronic system of the present invention.As shown in the figure, electronic system 100 " similar in appearance to the electronic system shown in Fig. 1 100, difference is that having set up cleaning shown in Figure 2 among the subordinate element SC of bridge 10 requires control circuit 12.For example, bridge 10 can be a north bridge chips, a South Bridge chip or its combination, but is not limited to this.
Finish one when peripherals 20 and write processing requirements, and send a look-at-me and give master element MA (for example CPU), notice can read one and write data in subordinate element SA (for example system storage).Before this pen in handling subordinate element SA write data, master element MA will check the state of peripherals 20.In other words, master element MA can read the state of subordinate element SD, and before reason required to finish herein, bridge 10 must confirm that this pen writes data and put into subordinate element SA.Maybe the data that read are returned to before the master element MA before the subordinate element SD reading of data, bridge 10 will produce a cleaning (flush) and require flush_req to give subordinate element SC, and waits for that subordinate element SC replys a cleaning and finishes confirmation signal (flushacknowledge) flush_ack and represent that this pen writes data and put into subordinate element SA.
When master element MC sends cleaning when requiring flush_req, cleaning in the bridge 10 requires the control circuit 12 can be in receiving cleaning when requiring flush_req, (the BF00～BF02) whether empty for example of n impact damper among the detecting buffer cell BF2, and note the impact damper that has emptied in n the impact damper, when n impact damper in receiving cleaning when having emptied one time all after requiring flush_req, then the output cleaning is finished confirmation signal flusn_ack to master element MC, is illustrated in to receive to clear up to require the data that write before the flush_req or instruct to be read.Therefore, subordinate element SC can not require flush_req because of the cleaning that master element MC sends, interrupt receiving processing requirements, can continue data and/or instruction are put into (push) buffer cell BF2, make the usefulness of system effectively to promote from master element MD in the peripherals 20.In certain embodiments, cleaning requires control circuit 12 can also be arranged among SB and the SD, but is not limited to this.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
10: bridger
12～14: cleaning requires control circuit
20: ancillary equipment
121～123: the detecting unit
124: output unit
125～127: processing unit
100,100 ": electronic system
RG0～RG2: working storage
OG1～OG6: or door
AD1～AD4, AN1～AN3: with door
MA, MB, MC, MD: master element
SA, SB, SC, SD: subordinate element
BF1, BF2: buffer cell
BF20～BF22: impact damper
MUX0～MUX5: multiplexer
INV0, INV2: phase inverter
DF0～DF2:D D-flip flop
Flush_req: cleaning requirement
Flush_ack: confirmation signal is finished in cleaning
Idle0～idle2: idle signal
Pending_ack0～pending_ack2: emptied signal
Ack0～ack2: determine to have emptied signal
CLK1: clock signal
Claims (13)
1. a bridge is characterized in that, comprising:
One first master element is in order to export a cleaning requirement;
One buffer cell comprises a plurality of impact dampers; And
One cleaning requires control circuit, in receiving above-mentioned cleaning when requiring, whether detect above-mentioned a plurality of impact damper is cleared, and note the impact damper that has emptied in above-mentioned a plurality of impact damper, if above-mentioned a plurality of impact dampers were cleared after receiving above-mentioned cleaning requirement all, confirmation signal is finished in output one cleaning, is cleared to inform the above-mentioned buffer cell of above-mentioned first master element.
2. bridge according to claim 1 is characterized in that, after above-mentioned buffer cell receives above-mentioned cleaning requirement, receives data or instruction from the first subordinate element.
3. bridge according to claim 1 is characterized in that, above-mentioned cleaning requires control circuit to comprise:
A plurality of detecting units are coupled to above-mentioned a plurality of impact damper accordingly, and when any of above-mentioned impact damper emptied, pairing detecting unit output one determined to have emptied signal; And
One output unit, above-mentioned when determining to have emptied signal in order to all to export when above-mentioned a plurality of detecting units, produce above-mentioned cleaning and finish confirmation signal.
4. bridge according to claim 3 is characterized in that, above-mentioned a plurality of detecting units include:
One working storage, the idle signal generation one that requires to send with corresponding impact damper according to above-mentioned cleaning has emptied signal, is cleared after receiving above-mentioned cleaning requirement to represent pairing impact damper; And
One processing unit according to above-mentioned signal and the above-mentioned idle signal of having emptied, produces the above-mentioned signal of determining to have emptied.
5. bridge according to claim 4 is characterized in that, above-mentioned processing unit comprises:
One with the door, have two output terminals and receive above-mentioned emptied signal and above-mentioned cleaning requirement respectively; And
One or door, the above-mentioned definite signal that emptied of idle signal output that sends according to the signal and the corresponding impact damper of above-mentioned and door output.
6. bridge according to claim 4 is characterized in that, above-mentioned a plurality of detecting units require control circuit to export after above-mentioned cleaning finishes confirmation signal in above-mentioned cleaning, remove all above-mentioned signals that emptied.
7. bridge according to claim 4 is characterized in that, the working storage of above-mentioned a plurality of detecting units is also finished confirmation signal according to above-mentioned cleaning and produced the above-mentioned signal that emptied.
8. the data clearing method of an electronic system is characterized in that, comprising:
When one of one first master element cleaning requires in receiving from a bridge, detect whether a plurality of impact dampers are cleared in the buffer cell, and note the impact damper that has been cleared in above-mentioned a plurality of impact damper; And
When above-mentioned a plurality of impact dampers had been cleared after receiving above-mentioned cleaning requirement time a time all, output one cleaning is finished confirmation signal to above-mentioned first master element.
9. the data clearing method of electronic system according to claim 8 is characterized in that, after above-mentioned buffer cell receives above-mentioned cleaning requirement, receives data or instruction from the first subordinate element.
10. the data clearing method of electronic system according to claim 8 is characterized in that, when any that more is included in above-mentioned impact damper emptied, output one was determined to have emptied signal, so that note the above-mentioned impact damper that has emptied.
11. the data clearing method of electronic system according to claim 10 is characterized in that, more comprises:
The idle signal generation one that requires to send with corresponding impact damper according to above-mentioned cleaning has emptied signal, is cleared after receiving above-mentioned cleaning requirement to represent pairing impact damper; And
According to above-mentioned signal and the above-mentioned idle signal of having emptied, produce the above-mentioned signal of determining to have emptied.
12. whether the data clearing method of electronic system according to claim 11 is characterized in that, be cleared according to corresponding above-mentioned idle signal detecting corresponding buffers.
13. the data clearing method of electronic system according to claim 11 is characterized in that, after more being included in output above-mentioned cleaning finishing confirmation signal, removes all above-mentioned signals that emptied.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101437025A CN100514318C (en) | 2007-07-30 | 2007-07-30 | Bridge and data clearing method of electronic system |
| US12/181,616 US7822906B2 (en) | 2007-07-30 | 2008-07-29 | Data flush methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101437025A CN100514318C (en) | 2007-07-30 | 2007-07-30 | Bridge and data clearing method of electronic system |
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| CN101079019A true CN101079019A (en) | 2007-11-28 |
| CN100514318C CN100514318C (en) | 2009-07-15 |
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| CNB2007101437025A Active CN100514318C (en) | 2007-07-30 | 2007-07-30 | Bridge and data clearing method of electronic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107970030A (en) * | 2017-12-22 | 2018-05-01 | 广州动医圈网络科技有限公司 | A kind of use in toilet human-body safety intelligent evaluation system |
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|---|---|---|---|---|
| US5535341A (en) * | 1994-02-24 | 1996-07-09 | Intel Corporation | Apparatus and method for determining the status of data buffers in a bridge between two buses during a flush operation |
| KR0154840B1 (en) * | 1995-12-05 | 1998-11-16 | 김광호 | Buffer flush controller of pci-pci bridge |
| US5987539A (en) * | 1996-06-05 | 1999-11-16 | Compaq Computer Corporation | Method and apparatus for flushing a bridge device read buffer |
| US6226704B1 (en) * | 1998-12-01 | 2001-05-01 | Silicon Integrated Systems Corporation | Method and apparatus for performing bus transactions orderly and concurrently in a bus bridge |
| US6513090B1 (en) * | 1999-03-31 | 2003-01-28 | Micron Technology, Inc. | Bidirectional data transfer during buffer flushing operations |
| US6385686B1 (en) * | 1999-07-13 | 2002-05-07 | Micron Technology, Inc. | Apparatus for supporting multiple delayed read transactions between computer buses |
| CN1180357C (en) * | 2001-01-09 | 2004-12-15 | 深圳市中兴集成电路设计有限责任公司 | Method for increasing bridging efficiency in multiple bus system and multiple port PCI bridge structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107970030A (en) * | 2017-12-22 | 2018-05-01 | 广州动医圈网络科技有限公司 | A kind of use in toilet human-body safety intelligent evaluation system |
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| CN100514318C (en) | 2009-07-15 |
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