WO2007105376A1 - 集積回路、及び集積回路システム - Google Patents
集積回路、及び集積回路システム Download PDFInfo
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- WO2007105376A1 WO2007105376A1 PCT/JP2007/050817 JP2007050817W WO2007105376A1 WO 2007105376 A1 WO2007105376 A1 WO 2007105376A1 JP 2007050817 W JP2007050817 W JP 2007050817W WO 2007105376 A1 WO2007105376 A1 WO 2007105376A1
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- master
- access
- circuit
- access request
- integrated circuit
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/16—Handling requests for interconnection or transfer for access to memory bus
- G06F13/1605—Handling requests for interconnection or transfer for access to memory bus based on arbitration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
- G06F13/362—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control
- G06F13/364—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control using independent requests or grants, e.g. using separated request and grant lines
Definitions
- SDRAM Synchronous Dynamic Random Access Memory
- Patent Document 1 is a technique for selectively switching data processing devices that access SDRAM when a plurality of data processing devices including a CPU (Central Processing Unit) access a shared SDRAM. This prevents the SDRAM from malfunctioning when the control signal to the SDRAM is interrupted at the time of switching, causing the data processing device to access the SDRAM stably.
- a CPU Central Processing Unit
- Patent Document 2 is a technique for improving the efficiency of use of a data bus when a plurality of processors share and access a synchronous DRAM.
- a time slot that can be accessed by each processor is set in advance.
- Each processor accesses the synchronous DRAM in the set time slot.
- the access order to the SDRAM of each processor is predetermined.
- a technique is known in which the command address of each access request is sequentially input to the SDRAM in accordance with the arbitration rules. This is because the SDRAM accepts the read / write command and address input and reads / writes data after a predetermined clock, and reads / writes data to / from one command address. By inputting the next command or address before the operation is completed, the data transfer is controlled to be performed continuously, and the data bus usage efficiency can be improved.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-102779
- Patent Document 2 Japanese Patent Laid-Open No. 7-311730
- an integrated circuit having only a new functional part is manufactured and connected to the existing integrated circuit.
- the SDRAM used in the integrated circuit is shared by the new integrated circuit, and the access efficiency of these integrated circuits is controlled with the same data bus usage efficiency as when transferring data with a single integrated circuit. There is a request.
- the present invention has been made in view of the above situation.
- processors and the like in a plurality of integrated circuits share a recording device such as an SDRAM, arbitration of access requests for each processor's equal power is performed.
- An object of the present invention is to provide an integrated circuit and an integrated circuit system that allow access to a recording device so as to improve data transfer efficiency.
- an integrated circuit includes a plurality of master circuits that share an external recording device and issue an access request including an address for data transfer to the recording device, An integrated circuit chip that controls access of the plurality of master circuits by selectively allowing one of the plurality of master circuits to access the recording device, and has a master circuit power external to the chip. Until the data transfer based on the access request of the input interface for accepting the access request and the access request of one of the plurality of master circuits selected to access the recording device is completed, the external master is completed.
- the recording apparatus is a SDRAM (Synchronous Dynamic Random Access Memory).
- the integrated circuit according to the present invention is a processor that accesses the same recording device such as SDRAM in a recording device such as SDRAM that can output an address or the like prior to actual data transfer. Even when an external integrated circuit including a master circuit such as the above is connected, it is possible to control access to the recording device from each master circuit so that the master circuit in the external integrated circuit is in its own chip. it can.
- the internal master circuit When an internal master circuit is selected as an access target to a recording device such as SDRAM, and an access request from an external master circuit is received by the end of data transfer of the master circuit, the internal master circuit Output the address related to the access request of the external master circuit during the data transfer of the internal master circuit before the start of the data transfer in order to perform the data transfer of the external master circuit continuously after the data transfer Determine the output timing of the corresponding address. Therefore, it is not possible to output the address related to the data transfer of the master circuit in the other integrated circuit until the data transfer of the master circuit in one integrated circuit is completed as in the prior art. Data transfer similar to that in the own chip can be performed.
- the integrated circuit chip has an output interface for outputting timing information for instructing an output timing of an address to the recording device to the outside of the chip
- the access control circuit sequentially selects the master circuit that accesses the recording device when the plurality of master circuits and the external master circuit power access request are received, which is the master circuit that issued the received access request.
- An arbitration circuit that determines the output timing of the address, and an access signal generation circuit that generates an access signal based on an access request of the plurality of master circuits.
- the arbitration circuit accesses the recording device.
- the external master the external master When the circuit is selected, the timing information indicating the output timing of the determined address is output as the output interface power, and when the plurality of master circuits are selected, the selected master circuit is indicated.
- Arbitration result information may be sent to the access signal generation circuit, and the access signal generation circuit may generate an access signal based on an access request of the master circuit indicated by the arbitration result information and send it to the recording device. Good.
- the arbitration circuit when the arbitration circuit causes the external integrated circuit connected to the chip to access the recording device, it transmits at least the output timing of the address to the external integrated circuit. Since the access signal generation circuit controls only the data transfer related to the access request of the master circuit within its own chip, even if the number of integrated circuits connected to the outside increases, the processing related to the data transfer is shared for each integrated circuit. Can be done.
- the integrated circuit according to the present invention includes a plurality of master circuits that share an external recording device and issue an access request including an address for data transfer to the recording device.
- An integrated circuit chip that controls access to the plurality of master circuits by selectively allowing one of the master circuits to access the recording device, and the master circuit power outside the own chip also accepts access requests.
- the master device Based on the input interface, the plurality of master circuits, and the external master circuit, each access request received, the master device selects one of the plurality of master circuits and stores the data in the recording device. It is determined that the external master circuit is to perform data transfer and then the external master circuit is to perform data transfer, and at a predetermined time from the data transfer timing of each master circuit.
- the predetermined condition is that an access request from an external master circuit is accepted following an access request of the internal master circuit power, and data transfer based on the access request of the internal master circuit is performed before the external master circuit.
- the subsequent data transfer is performed as soon as possible after the end of the previous data transfer.
- the access control circuit relates to the subsequent data transfer while the previous data transfer period is being performed and whether the output period of the address related to the subsequent data transfer overlaps or not. Since the output timing can be determined so as to output the address, even if the target to access the recording device is changed between the internal master circuit and the external master circuit, Data transfer can be performed by internal and external master circuits with similar data transfer efficiency.
- the integrated circuit according to the present invention includes a plurality of master circuits that share an external recording device and issue an access request including an address for data transfer to the recording device.
- An integrated circuit chip that controls access to the plurality of master circuits by selectively allowing one of the master circuits to access the recording device, and outputs the access request to the outside of the chip.
- the interface an input interface for receiving timing information indicating the output timing of the address related to the output access request, and the access request from each of the plurality of master circuits, and the access request is received according to a predetermined rule.
- Output interface force Sequentially output to outside, the input interface force
- the timing information Put, based on the timing information received, Te, characterized in that it comprises an access control circuit for controlling such that I line access to the master circuit initiates an access request the output.
- the integrated circuit according to the present invention includes the input interface that can accept the output timing of the address related to the access request from the master circuit in the own chip even by an external force.
- the integrated circuit of the present invention is connected to an existing integrated circuit that can output the output timing of the address corresponding to the access request corresponding to the master circuit power in its own chip, the integrated circuit power and data The transfer timing can be accepted and the recording device can be accessed at that timing.
- An access control circuit, and the second integrated circuit chip includes an address including an address for data transfer to the recording device.
- a plurality of master circuits for issuing access requests; an output interface for outputting the access requests to the first integrated circuit chip; an input interface for receiving the timing information from an external force; and receiving the access requests from the plurality of master circuits.
- the access request is sequentially output from the output interface to the first integrated circuit chip according to a predetermined rule, the input interface power is received, the timing information is received, and the output is performed based on the received timing information. And an access control circuit that controls the master circuit that has issued the access request to perform access.
- the data processing device is a data processing device including a first integrated circuit chip, a second integrated circuit chip, and a recording device, and the first integrated circuit chip transfers data to the recording device.
- An access control circuit for controlling access The second integrated circuit chip includes a plurality of master circuits for issuing an access request including an address for data transfer to the recording device, an output interface for outputting the access request to the first integrated circuit chip, and an output An input interface for receiving timing information indicating the output timing of the address related to the access request, and the access request from each of the plurality of master circuits, and sequentially receiving the access request from the output interface according to a predetermined rule.
- An output that outputs to the first integrated circuit chip accepts the input interface power, receives the timing information, and controls access to the master circuit that issued the output access request based on the received timing information. And a control circuit. .
- the first integrated circuit chip and the second integrated circuit chip pass the access request in the second integrated circuit chip and the address related to the access request of the master circuit in the second integrated circuit chip. Are connected to each other so that timing information indicating the output timing can be exchanged. Therefore, the access timings of the master circuits in both chips are arbitrated according to a predetermined arbitration rule in the first integrated circuit, and the data transfer by the master circuits in both chips is continuously performed. Can be determined.
- the second integrated circuit chip can transfer data to the master circuit in its own chip based on the designated timing of the first integrated circuit chip force, and the data transfer processing is shared for each integrated circuit chip. It can be carried out.
- FIG. 1 shows a configuration diagram of an integrated circuit system according to an embodiment.
- FIG. 2 (a) shows an example of access request information stored in the buffer of the arbitration circuit 120 in the case of only the main LSI 100 according to the embodiment.
- (B) shows an example of access request information stored in the buffer of the arbitration circuit 220 when an access request is issued from the main LSI 100 and the sub LSI 200 according to the embodiment, and
- (c) shows the embodiment.
- FIG. 3 is a timing chart showing changes over time in controlling data transfer when an access request is accepted only from main LSI 100.
- FIG. 4 is a timing chart showing temporal changes in data control when an access request is received from the main LSI 100 and the sub LSI 200.
- FIG. 1 shows a configuration diagram of an integrated circuit system composed of a main LSKLarge Scale Integration) and a sub LSI according to an embodiment, and an SDRAM shared by the main LSI and the sub LSI.
- the masters A to C and masters a to c in the figure have a CPU that uses the SDRAM 300 as a main memory, and a DSP (Digital Signal P each master circuit in the main LSI 100 and the sub LSI 200 shares the SDRAM 300.
- a DSP Digital Signal P each master circuit in the main LSI 100 and the sub LSI 200 shares the SDRAM 300.
- the data processing apparatus including the main LSI 100 and the sub LSI 200 includes a clock supply circuit (not shown) and supplies a clock signal to the main LSI 100, the sub LSI 200, and the SDRAM 300.
- the SDRAM 300 is a clock synchronous DRAM, and includes a clock input terminal, an address input terminal, a data input / output terminal, a command input terminal, and control terminals such as activation control.
- the SDRAM 300 includes a command signal line connected to the command input terminal, an address signal line connected to the address input terminal, a data signal line connected to the data input / output terminal, and a control signal line connected to the control terminal.
- the access signal generation circuit 130 of the main LSI 100 and the access signal generation circuit 230 of the sub LSI 200 are connected.
- the SDRAM 300 accepts a command signal indicating a command (Write or Read), an address signal indicating an address, and a data signal indicating data from the main LSI 100 and the sub LSI 200 at a timing based on the clock.
- the main LSI 100 in FIG. 1 includes a master ALL, a master B 112, a master C 113, an arbitration circuit 120, and an access signal generation circuit 130, is connected to the SDRAM 300, and is further connected to the ij LSI 200.
- the master circuits of master Al 1, master B 112, and master C 113 are a CPU, a DSP, and the like, and each independently transfers data to SDRAM 300.
- Each master circuit is connected to the arbitration circuit 120 through Req-A, Req-B, Req-C Req signal lines, and Ack-A, Ack-B, Ack-C Ack signal lines, respectively.
- Each master circuit uses Com-A, Com-B, Com-C Com signal lines for sending commands to SDR AM300, Data-A, Data-B, for sending / receiving data to / from SDR AM300,
- the data signal line of Data-c and the Add signal line of Add-A, Add-B, and Add-C for specifying the address of the SDRAM 300 are connected to the access signal generation circuit 130.
- each master circuit When each master circuit requests data transfer, it sends an access request including information such as a command and data transfer amount to the arbitration circuit 120 through each Req signal line.
- Each master circuit receives a response signal for the transmitted access request from the arbitration circuit 120 through each Ack signal line.
- Each master circuit needs to send the command, address, and data related to the transmitted access request to the access signal generation circuit 130 through each Com signal line, Add signal line, and Data signal line, and then transfer data. If the response signal is received from the arbitration circuit 120, the next access request is sent to the arbitration circuit 120.
- the arbitration circuit 120 is connected to each master circuit (A to C) by the Req signal line and the Ack signal line, and is an access signal generation circuit with a timing control signal line for transmitting the access timing including the arbitration result. Connected with 130.
- the arbitration circuit 120 also includes an external Req signal line for accepting an access request from the sub LSI 200 to the SDRAM 300, and the SD The timing control signal line for transmitting the access timing to the RAM 300 is connected to the sub LSI 200.
- timing control signal line in main LSI 100 is provided with a signal line for transmitting access timing for each master circuit (A to C).
- the arbitration circuit 120 accepts an access request from each master circuit through each Req signal line, and also accepts an access request from the sub LSI 200.
- the arbitration circuit 120 stores the access request information indicating the access request in a buffer (not shown) in the order received.
- the buffer uses, for example, a FIFO buffer.
- the access request information stored in the buffer includes information for identifying the access request source, the type of command, and data related to the access request. This information is associated with the transfer amount information.
- the arbitration circuit 120 uses the data transfer amount of the access request information stored in the buffer and the clock cycle required for data transfer of each access request information based on the predetermined number of bits that can be transmitted in parallel. Calculate the number. Based on the timing based on the clock signal and the calculated number of clock cycles, the arbiter circuit 120 receives a command signal and a command signal from the master circuit or sub LSI 200 that is sequentially selected so that data transfer related to each access request is continuously performed. And the timing for sending the address signal to the SDRAM 300 is determined.
- the arbitration circuit 120 determines whether or not the data transfer based on each access request is completed, regardless of whether or not the master circuit that issued the access request to transfer data has an internal master circuit power.
- the command related to the access request of the master circuit selected as the target of data transfer after the data transfer during the output of the data signal related to each data transfer
- the output timing of the command signal and address signal is determined so that the signal and address signal are output.
- the arbitration circuit 120 determines the timing control signal line corresponding to the master circuit. Is sent to the access signal generation circuit 130. If the selected master circuit is the master circuit of the sub LSI 200, a timing control signal indicating the determined timing is sent to the gij LSI 200.
- the arbitration circuit 120 transmits the access control timing to the access signal generation circuit 130 and the sub LSI 200 by outputting the timing control signal at a low level.
- the access signal generation circuit 130 is connected to each master circuit by each Com signal line, Add signal line, and Data signal line, and the arbitration circuit 120 is a timing control signal line for each master circuit.
- the SDRAM 300 is connected with a command signal line, an address signal line, a data signal line, and a control signal line.
- the access signal generation circuit 130 receives commands, addresses, and data related to access requests through the Com signal line, the Add signal line, and the Data signal line of each of the masters Al1, master B112, and master C113. Is stored in a buffer (not shown). The access signal generation circuit 130 generates an access signal for performing data transfer with the SDRAM 300 based on the stored command, address, and data.
- the generated access signal is a signal indicating each of the command, address, and data, a control signal for activating the SDRAM 300, and a burst transfer during writing to the end.
- This is a command signal such as NOP (NO OPERATION).
- the access signal generation circuit 130 receives the low-level timing control signal from the arbitration circuit 120, the access signal generation circuit 130 indicates an access signal (hereinafter, referred to as a command from the master circuit indicated by the timing control signal including the arbitration result information).
- "Command signal” and an access signal indicating the address hereinafter referred to as "address signal” are sent to the SDRAM 300 through the command signal line and the address signal line.
- an access signal indicating data hereinafter referred to as a “data signal” is sent through the data signal line at the predetermined timing described above and one clock after the command signal is transmitted. To send.
- the IJLSI 200 shown in the figure like the main LSI 100, includes a master a 211, a master b 212, a master c 213, an arbitration circuit 220, and an access signal generation circuit 230.
- the SDRA M300 is connected. .
- Masters a to c are CPUs, DSPs, etc., similar to masters A to C described above.
- Each master circuit has its own Req signal line (Req-a, Req-b, Req-c) and Ack signal. Lines (Ack-a, Ack-b, Ack-c) are connected to the arbitration circuit 220, and each Com signal line (Com-a, Com-b, Com-c), Add signal line (Add-a, Add) -Connected to the access signal generation circuit 230 by b, Add-c) and Data signal lines (Data-a, Data-b, Data-c).
- each master circuit When transferring data to SDRAM 300, each master circuit sends an access request to arbitration circuit 220 through each Req signal line, and receives a response signal from arbitration circuit 220 through each Ack signal line. Each master circuit sends a command, an address, and data related to the access request sent to the arbitration circuit 220 to the access signal generation circuit 230 through each signal line.
- the arbitration circuit 220 is connected to the master circuits (a to c) through the respective Req signal lines and Ack signal lines, and is connected to the main LSI 100 through the external Req signal lines and the timing control signal lines.
- the access signal generation circuit 230 is connected by a signal line for transmitting master specifying information indicating a master circuit to which data is to be transferred to the SDRAM 300.
- Arbitration circuit 220 accepts access requests sent out by master circuits (a to c), stores access request information in the order in which they are accepted, stores them in a buffer, for example, the order in which access requests are accepted, etc. Master circuits (a to c) that cause SDRAM 300 to perform data transfer are sequentially selected according to a pre-designed arbitration rule.
- the arbitration circuit 220 stores the master circuit based on the selection result when the low-level timing control signal is received from the main LSI 100, and identifies the master circuit to the access signal generation circuit 230.
- the master identification information indicating is sent.
- the arbitration circuit 220 shall send out the next access request when it receives the timing control signal at the LOW level.
- the access signal generation circuit 230 is connected to each master circuit (a to c) by each Com signal line, Add signal line, and Data signal line, and the arbitration circuit 220 receives master identification information.
- the SDRAM 300 is connected by a command signal line, an address signal line, and a data signal line, and each signal line is the same as described above.
- the access signal generation circuit 230 receives commands, addresses, and data from each master circuit (a to c) through each Com signal line, Add signal line, and Data signal line, and accesses the SDRAM300. Each access signal is generated and stored in a buffer.
- the access signal generation circuit 230 receives the master specifying information from the arbitration circuit 220, and sends each access signal of the command and address of the master circuit indicated by the master specifying information to the SDRAM 300 through each signal line, and according to the command For example, in the case of a data write request, the data signal is sent to the SDRAM 300 through the data signal line at a timing one clock after the command input.
- Fig. 2 (a) shows an example of access request information stored in the FIFO buffer by the arbitration circuit 120 that also accepts the master circuit (A to C) power. Show that the access request was accepted in the order of B 112 and master CI 13! /.
- the acceptance order 11 shows the order in which the arbitration circuit 120 accepts the access request for convenience of explanation, and it is assumed that the access request information from which the router has been taken out does not remain in the buffer.
- the Req signal line 12 is information for identifying the transmission source of the access request, and indicates the Req signal line that has accepted the access request.
- Command 13 is a command indicating reading or writing of data to / from SDRAM 300. It is a For example, in the case of a data write request, it is indicated by “Write”, and for the sake of convenience of description, a character for identifying the master circuit is added, such as “WriteA”.
- the transfer amount 14 indicates the amount of data that each master circuit needs to transfer to the SDRAM 300, and in this embodiment, the unit of the data amount is expressed in bytes.
- the number of bits that can be transmitted in parallel is 16 bits.
- the number of data transfer cycles is 2.
- Fig. 2 (b) shows an example of access request information received from the arbitration circuit 220-power master circuit (ac) of the sub LSI 200 and stored in the buffer.
- the master b212, master It shows that the access request was accepted in the order of a211 and master c213.
- the access request information 20 shown in the figure is the same as the access request information 10 shown in FIG.
- Figure 2 (c) shows an example of access request information received from the arbitration circuit 120-power master circuit (AC) and sub-LSI 200 of the main LSI 100 and stored in the buffer.
- the master Al This indicates that access requests were accepted in the order of l1, ⁇ ijLSI200, and master C113.
- the access request information 30 shown in the figure is the same as the access request information 10 shown in Fig. 2 (a), detailed description thereof is omitted.
- the SDRAM 300 used in this operation example is a DDR SDRAM (Double Data Rate Synchronous DRAM), and in the timing charts shown in FIGS. 3 and 4, ck and / ck * are used for the S DRAM 300 to operate.
- This is a clock
- / CK * is a signal with the same period as CK and a phase opposite to CK
- ck is shown as a solid line
- / ck * is shown as a dotted line.
- the SDRAM300 controls data input / output in synchronization with both rising and falling edges of the clock (ck), and the command is the rising edge of the clock (ck) and the falling edge of the clock (/ ck *). Latch in synchronization with the timing of the intersection. If the burst length is 4 cycles and the data write is requested, data write starts 1 clock after the Write command is input. Shall.
- FIG. 3 is a timing chart showing a temporal change in which the arbitration circuit 120 that receives the access request from the masters A to C of the main LSI 100 controls data transfer to the SDRAM 300 related to the access request.
- each access signal in response to a data write request from the master All 1 has a command signal WRITE-A, an address Write the signal as ADD-A and the data signal as AO.
- the arbitration circuit 120 sequentially receives the write request shown in the access request information 10 in FIG. 2 (a) through the Req signal lines of the masters A to C and stores them in the buffer. Every time a write request is received, the arbitration circuit 120 receives the write request. Based on the data transfer amount and the number of bits that can be transmitted in parallel, the number of cycles required for data transfer is calculated.
- the arbitration circuit 120 also identifies the master circuit for the Req signal line force that received the access request, determines the timing for inputting the command and address from the specified master circuit to the SDRAM 300, and arbitrates at the determined timing. A timing control signal including the result information is sent to the access signal generation circuit 130.
- the arbitration circuit 120 identifies the master A that first transmitted the access request via the Req-A signal line.
- the arbitration circuit 120 sends a low-level timing control signal to the access signal generation circuit 130 via the timing control signal line corresponding to the master Al 11 at the timing T1 in FIG.
- the access signal generation circuit 130 inputs the command signal WRITE-A and address signal ADD-A of the master A1 11 to the SDRAM 300 at the timing of the rising edge T2 of the clock (ck). To do.
- the access signal generation circuit 130 has a command signal WRITE-A and Data signals AO and A1 are input to SDRAM300 at the timing of the rising edge and falling edge of clock (ck) from T4 one clock after the input of address signal ADD-A.
- the arbitration circuit 120 specifies the master B 112 as a master circuit to be accessed by the SDRAM 300 next to the master A 111.
- the input of the master Bl 11 data signal starts from the rising edge of T6 when the master Al 11 data signal input ends.
- the timing control signal of the LOW level is sent to the access signal generation circuit 130 through the timing control signal line corresponding to the master B 112 at the timing of T3.
- the access signal generation circuit 130 When receiving the timing control signal, the access signal generation circuit 130 inputs the command signal WRITE-B of the master B 112 and the address signal ADD-B to the SDRAM 300 at the timing of the rising edge T4 of the clock (ck). The access signal generation circuit 130 generates the NOP signal until the next timing control signal is received, and inputs the NOP signal to the SDRAM 300 at the timing of the rising edge T6 of the clock (ck).
- the access signal generation circuit 130 receives the command signal WRITE-B and address signal ADD-B of the master B112 at the timing of the rising edge and falling edge of the clock (ck) from T6 one clock after the input. Input the data signals B0 to B3 to the SDRAM300.
- the access signal generation circuit 130 Upon receipt of the timing control signal, the access signal generation circuit 130 inputs the command signal WRITE-C and address signal A DD-C of the master C113 to the SDRAM 300 at the timing of the rising edge T8 of the clock (ck). . Also, the rising edge and falling edge of the clock (ck) from T10 one clock after the input of command signal WRITE-C and address signal ADD-C. The data signals C0 and C1 of the master CI 13 are input to the SDRAM 300 at the timing of the edge.
- the SDRAM 300 latches each access signal input at each timing described above at a timing based on the clock.
- FIG. 4 is a timing chart showing a temporal change in which the arbitration circuit 120 that receives an access request from the master circuit of the main LSI 100 and the sub LSI 200 controls data transfer to the SDRAM 300 related to the access request.
- this is a result of controlling the data transfer from each master circuit of the main LSI 100 and the sub LSI 200 to the SDRAM 300 based on the arbitration circuit 120 of the main LSI 100. Show and speak.
- the access request information 20 shown in FIG. 2 (b) indicates the access request accepted by the arbitration circuit 220 of the sub LSI 200 as described above.
- the arbitration circuit 220 is the earliest through the Reqb signal line.
- the master b212 that sent the access request is selected, an access request including information on the command “Writeb” and transfer amount “8 bytes” is sent to the main LSI 100 through the external Req signal line, and the selection result indicating the master b212 is displayed.
- the arbitration circuit 120 of the main LSI 100 identifies the master Al 11 that received the access request first in the access request information 30 of FIG. 2 (c).
- the arbitration circuit 120 sends a low-level timing control signal to the access signal generation circuit 130 through the timing control signal line corresponding to the master A111 at T1 in FIG.
- the circuit 130 inputs the command signal WRITE-A and the address signal ADD-A to the SDRAM 300 at the timing of T2.
- the access signal generation circuit 130 generates the data signal AO at the timing of the rising edge and falling edge of the clock (ck) of T4 one clock after the input of the command signal WRITE-A and the address signal ADD-A.
- Al is input to SDRAM300.
- the arbitration circuit 120 sets the sub LSI 200 as the access target because the Req signal line indicating the transmission source of the next access request is “external Req” in the access request information 30 of FIG. To identify.
- the arbitration circuit 120 Since the data transfer cycle of the master All 1 is 2 cycles, the arbitration circuit 120 has the T3 register so that the data of the sub LSI 200 can be input from the rising edge of the clock (ck) of T6 when the input ends. At timing, a low-level timing control signal is sent to the sub LSI 200.
- the arbitration circuit 220 of the sub LSI 200 When the arbitration circuit 220 of the sub LSI 200 receives the timing control signal from the main LSI 100, the arbitration circuit 220 identifies the master b212 based on the stored selection result, and sends master identification information indicating the master b212 to the access signal generation circuit 230. .
- the access signal generation circuit 220 receives the master identification information
- the command signal WRITE-b and address signal ADD-b of the master b212 indicated by the master identification information are transferred to the rising edge T4 of the clock (ck). Input to SDRAM300 at timing.
- the access signal generation circuit 230 receives the data b0 to b3 of the master b212 at the timing of the rising edge and falling edge of the clock from T6 one clock after the input of the command signal WRITE-b and the address signal ADD-b. Input to SDRAM300.
- the access signal generation circuit 130 of the main LSI 100 receives the next access control signal at the timing of the rising edge T4 of the clock (ck) after the input of the command signal WRITE-A and the address signal ADD-A. NOP signal is input to SDRAM300 until is input.
- the arbitration circuit 120 of the main LSI 100 specifies the master C 113 as an access target from the access request information 30 in FIG. 2 (c).
- the arbitration circuit 120 Since the data transfer cycle of the gijLSI200 is 4 cycles, the arbitration circuit 120 starts the data transfer of the master C113 from the rising edge of the clock (ck) of T10 when the data transfer ends.
- a low-level timing control signal is sent to the access signal generation circuit 130 through the timing control signal line corresponding to the master C113.
- the access signal generation circuit 130 When receiving the timing control signal, the access signal generation circuit 130 inputs the command signal WRITE-C of the master C113 and the address signal A DD-C to the SDRAM 300 at the timing of the rising edge T8 of the clock (ck).
- the access signal generation circuit 130 receives the rising edge and the rising edge of the clock (ck) from T10 one clock after the input of the command signal WRITE-C and address signal ADD-C of the master C113. Input master CI 13 data CO, C1 to SDRAM300 at falling edge timing
- FIG. 4 When the example of FIG. 4 shown in the above-described embodiment is realized by using the conventional technique, it is shown in FIG.
- the data transfer period of each master circuit selected as the target to access the SDRAM the command and address output period related to the access request of the master circuit to transfer data following the data transfer, It is possible to output commands and addresses related to the subsequent data transfer in parallel with the previous data transfer, and as a result, as in the case of a single integrated circuit. Therefore, the data transfer of each master circuit selected as the SDRAM access target can be continuously performed, and the data transfer efficiency can be improved as compared with the conventional case.
- FIG. 5 shows a configuration diagram of an integrated circuit system according to a modification of the above-described embodiment.
- the arbitration circuit on the main LSI 100 side determines the access timing of each access request based only on the arbitration result, and based on the timing V, the main LSI 100 and the sub LSI 200
- the access timing of each access request is determined by the access signal generation circuit of the main LSI 100, and data is transferred to the SDRAM 300.
- the arbitration circuit 121 of the main LSI 100 sequentially selects the master circuit or the sub LSI 200 to be accessed by the SDRAM 300 according to a predetermined rule, but the access signal generation circuit 131 of the main LSI 100 Sends only arbitration result information indicating the selection result, and sends a response signal to the sub-LSI 200 indicating that the access request has been accepted.
- the arbitration circuit 221 of the sub-LSI 200 identifies the master circuit (a to c) that is the source of the access request corresponding to the response signal, as in the embodiment, and The specific information is sent to the access signal generation circuit 231.
- the access signal generation circuit 231 generates a command, address, and data access signal for the master circuit indicated in the master identification information, and sends it to the access signal generation circuit 131 of the main LSI 100.
- the access signal generation circuit 131 of the main LSI 100 generates an access signal for the master circuit (A to C) in its own chip as in the embodiment, and transmits the generated access signal and the sub LSI 200. Based on the arbitration result information, the access signal thus transmitted is sent to the SDRAM 300 so that the data transfer related to each access request is continuously performed.
- the LSI according to the present invention has been described based on the embodiment.
- the present invention can be modified as follows, and the present invention is of course not limited to the LSI shown in the above-described embodiment.
- the arbitration circuit 120 has been described using the arbitration rule that specifies the master circuit that accesses the SDRAM 300 in the order in which the access requests are received.
- the arbitration rule may be a rule in which the priority of the master circuit to which the access request should be prioritized is determined by the user, or information indicating the arbitration rule is acquired from the sub-LSI 200, and the access request according to the acquired rule
- the arbitration may be changed dynamically.
- each master circuit power is accepted by the master circuit power, the master circuit for accessing the SDRAM 300 is specified, and the command, address, and data of the master circuit specified by the arbitration circuit are transferred to the SDRAM.
- the operation of sending and controlling access has been described as being performed by the arbitration circuit and the access signal circuit. However, a configuration in which these operations are performed by one circuit may be used.
- the power described as supplying the clock to the main LSI 100 and the sub LSI 200 is supplied to the main LSI 100, and the main LSI 100 to the sub LSI 200 is used for phase adjustment.
- a clock may be output, and the iiLSI 200 may perform access at a timing based on the clock.
- the arbitration circuit 120 has been described as determining the data transfer timing in its own chip.
- the access signal generation circuit 130 must determine the data transfer timing in its own chip. It is good.
- the arbitration circuit 120 sends only the arbitration result information to the access signal generation circuit 130 for access to the master circuit in its own chip, and the access signal generation circuit 130 is the master in the order indicated by the arbitration result information. Signals such as commands with circuit power are sent at a timing based on the clock.
- the arbitration circuit 120 also has a function of monitoring the status of data transfer between the access signal generation circuit 130 and the SDRAM 300. Based on the status of data transfer to the SDRAM 300, the arbitration circuit 120 is connected to the master circuit of the own chip and the sub LSI 200. The access timing of the sub LSI 200 is determined and an access control signal is sent so that data transfer related to the access request can be continuously performed. To do.
- the SDRAM 300 is a DDR SDRAM.
- the command input force is not limited to this as long as it is a clock-synchronized recording device that transfers data at a predetermined timing.
- the arbitration circuit 120 of the main LSI 100 and the access signal generation circuit 130 are described as being connected through the timing control signal line for each master circuit (A to C). As long as the access timing can be transmitted, either serial transmission or other parallel transmission can be used.
- the access signal generation circuit 130 of the main LSI 100 outputs a control signal to the SDRAM 300 based on the timing control signal.
- the access signal generation circuit of the gijLSI 200 A control signal may be output from 230 to the SDRAM 300.
- each master circuit of the main LSI 100 and the sub LSI 200 has been described as sending an access request including the data transfer amount to the arbitration circuit. However, the data transfer amount of each master circuit is described. If is a fixed length, each master circuit does not send V and the data transfer amount to the arbitration circuit in response to the access request!
- the integrated circuit system and the integrated circuit according to the present invention can be used for information equipment such as an image processing apparatus.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP07707105A EP2006773A4 (en) | 2006-03-10 | 2007-01-19 | INTEGRATED CIRCUIT AND INTEGRATED CIRCUIT SYSTEM |
JP2008504994A JP4902640B2 (ja) | 2006-03-10 | 2007-01-19 | 集積回路、及び集積回路システム |
US12/282,058 US8180990B2 (en) | 2006-03-10 | 2007-01-19 | Integrated circuit including a plurality of master circuits transmitting access requests to an external device and integrated circuit system including first and second interated circuits each including a plurality of master circuits transmitting access requests |
Applications Claiming Priority (2)
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JP2006-066753 | 2006-03-10 | ||
JP2006066753 | 2006-03-10 |
Publications (1)
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WO2007105376A1 true WO2007105376A1 (ja) | 2007-09-20 |
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PCT/JP2007/050817 WO2007105376A1 (ja) | 2006-03-10 | 2007-01-19 | 集積回路、及び集積回路システム |
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US (1) | US8180990B2 (ja) |
EP (1) | EP2006773A4 (ja) |
JP (1) | JP4902640B2 (ja) |
WO (1) | WO2007105376A1 (ja) |
Cited By (1)
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JP2014508361A (ja) * | 2011-03-14 | 2014-04-03 | ヒューレット−パッカード デベロップメント カンパニー エル.ピー. | メモリ・インターフェース |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US8312193B2 (en) * | 2010-01-08 | 2012-11-13 | International Business Machines Corporation | Eager protocol on a cache pipeline dataflow |
KR20130046122A (ko) * | 2011-10-27 | 2013-05-07 | 에스케이하이닉스 주식회사 | 반도체 메모리 장치 및 그 동작 방법 |
JP6890055B2 (ja) * | 2017-06-30 | 2021-06-18 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
JP2020154759A (ja) * | 2019-03-20 | 2020-09-24 | キオクシア株式会社 | メモリシステム |
TWI774594B (zh) * | 2021-10-28 | 2022-08-11 | 瑞昱半導體股份有限公司 | 儲存裝置共享系統及儲存裝置共享方法 |
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JP2004227049A (ja) * | 2003-01-20 | 2004-08-12 | Renesas Technology Corp | データ転送装置、半導体集積回路及びマイクロコンピュータ |
JP2006172256A (ja) * | 2004-12-17 | 2006-06-29 | Renesas Technology Corp | 情報処理装置 |
KR101153712B1 (ko) * | 2005-09-27 | 2012-07-03 | 삼성전자주식회사 | 멀티-포트 sdram 엑세스 제어장치와 제어방법 |
WO2007097006A1 (ja) * | 2006-02-24 | 2007-08-30 | Fujitsu Limited | パケット送出制御装置および方法 |
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- 2007-01-19 WO PCT/JP2007/050817 patent/WO2007105376A1/ja active Application Filing
- 2007-01-19 JP JP2008504994A patent/JP4902640B2/ja not_active Expired - Fee Related
- 2007-01-19 US US12/282,058 patent/US8180990B2/en not_active Expired - Fee Related
- 2007-01-19 EP EP07707105A patent/EP2006773A4/en not_active Withdrawn
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JP2014508361A (ja) * | 2011-03-14 | 2014-04-03 | ヒューレット−パッカード デベロップメント カンパニー エル.ピー. | メモリ・インターフェース |
KR101527308B1 (ko) * | 2011-03-14 | 2015-06-09 | 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. | 메모리 인터페이스 |
US9411757B2 (en) | 2011-03-14 | 2016-08-09 | Hewlett Packard Enterprise Development Lp | Memory interface |
Also Published As
Publication number | Publication date |
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EP2006773A2 (en) | 2008-12-24 |
EP2006773A4 (en) | 2011-10-05 |
US20090013144A1 (en) | 2009-01-08 |
EP2006773A9 (en) | 2009-07-08 |
US8180990B2 (en) | 2012-05-15 |
JPWO2007105376A1 (ja) | 2009-07-30 |
JP4902640B2 (ja) | 2012-03-21 |
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