CN101894035A - Method for updating EPON terminal system program based on NOR Flash - Google Patents
Method for updating EPON terminal system program based on NOR Flash Download PDFInfo
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Abstract
The invention discloses a method for updating an EPON terminal system program based on NOR Flash. An EPON system is a point-to-multipoint network system, which mainly comprises three parts, namely a local side OLT, a terminal ONU and a passive optical splitter ODN. In the method for updating the EPON terminal system program, a, a receiving logic of an OAM, b, a CUP, c, a NOR Flash controller, d, an RAM space and e, other hardware-assisted logics are involved, wherein when OLT performs program updating on the ONU in an OAM mode, the OLT sends the OAM frame carrying the program to be updated to the CPU and the OAM frame is received by the OAM receiving logic in the process; the CPU mainly finishes analyzing the OAM, extracts program contents which need to be updated, and initiates an updating operation on the NOR Flash; and the NOR Flash controller performs operation such as reading, writing, erasing and like on the NOR Flash. The method of the invention has been applied to practical chip research and development processes and passed practical test, and can finish a program updating operation.
Description
Technical field
The present invention relates to be applied to the method for updating program of EPON terminal system (ONU), relate in particular to and utilizing NOR Flash, and, utilize the OAM telemanagement to carry out the method for program updates by OLT as data and program storage area.
Background technology
The EPON system is the network system of a kind of point to multiple spot, and it mainly comprises three parts: local side OLT, terminal (user side) ONU and passive optical splitter ODN, as shown in Figure 1.
EPON terminal (ONU) is positioned at user side, be positioned in user's corridor or subscriber household, therefore the program updates of ONU generally is based on the method for remote management of OAM, be that OLT passes through specific OAM frame, the program that needs are upgraded is published to ONU this locality, ONU then receives the OAM frame, and extracts the program that needs renewal, automatically at local update.This update method has realized that the unmanned of ONU end upgrades, and has reduced personnel's expense and cost in EPON system deployment and the operation process.ONU general using Flash or EEPROM save routine, and the dynamic memory zone when using SDRAM or Flash as program run.Do not utilize program shelf space and the program run space of NOR Flash while but have as yet at present as the EPON terminal system.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, and a kind of EPON terminal system method for updating program based on NOR Flash is provided.Described EPON system is the network system of a kind of point to multiple spot, and it mainly comprises three parts: local side OLT, terminal (user side) ONU and passive optical splitter ODN; Described EPON terminal system method for updating program mainly comprises:
The receive logic of a, OAM: when OLT carries out program updates by the OAM mode to ONU, need carry the program of need upgrading by the OAM frame, and send to CPU, in this process, the receive logic that needs OAM is finished the reception to the OAM frame, and sends to CPU;
B, CPU:CPU mainly finish the parsing to the OAM frame, extract the contents of program that needs renewal, and initiate the renewal operation to NOR Flash;
C, NOR Flash controller: because CPU itself do not control NOR Flash, therefore, need NOR Flash controller and finish operation, operation such as comprise reading and writing, wipe to NOR Flash to NOR Flash;
D, ram space: after CPU has resolved the OAM frame, can the program that needs upgrade temporarily be stored among the RAM, select suitable chance to write NOR Flash then;
E, other hardware auxiliary logics comprise interruptable controller, register etc.
In the described part (a), also comprise:
1) OAM frame receive logic might receive non-OAM frame, need abandon non-OAM frame, in the EPON system, judge that whether a frame is that the method for OAM frame is: the Lengty/Type territory of ethernet frame is if 0x8809, then present frame is the OAM frame, otherwise not being, then is non-OAM frame, and this receive logic need abandon present frame;
2) OAM frame receive logic need judge whether frame is effective, whether the FCS territory that is frame is correct: when carrying out the transmission of Frame in network, might disturb situation that error in data occur because of signal, this can be by carrying out the CRC32 verification to frame, is added on the frame end as the FCS territory of frame; And OAM frame receive logic needs to judge whether the FCS territory is correct when receiving, if incorrect, then abandons current OAM frame;
3) the present invention proposes and utilize OAM frame receive logic (hardware approach) to carry out the judgement in FCS territory, can offloading the CPU, improve treatment effeciency;
In the described part (b), also comprise:
1) CPU can be 8 bit CPUs, 16CPU or 32 bit CPUs, and the present invention does not limit selected cpu type;
2) CPU need handle according to the standard definition form of OAM when resolving the OAM frame, and the present invention is based on the defined OAM form of IEEE802.3, but is not limited in the defined OAM form of IEEE802.3 agreement;
3) CPU is when resolving the OAM frame, can the refresh routine information temporary storage that from the OAM frame, extracts in RAM but the present invention only do not limit and can use RAM;
In the described part (c), also comprise:
1) operation that need finish NOR Flash of NOR Flash comprises: reading and writing and wiping.Erase operation can comprise to be wiped or sector erasing the sheet of NOR Flash;
2) the present invention do not limit be by the type of NOR Flash, thus, the present invention does not limit the operating characteristic of NOR Flash;
In the described part (d), also comprise:
1) use the metadata cache space of RAM among the present invention as refresh routine, but the present invention do not limit be by the RAM capacity;
2) can select to use the metadata cache space of other types, for example SDRAM etc.;
Described EPON terminal system method for updating program based on NOR Flash consists predominantly of following two processes: the one, and at the erase process of NOR Flash, the 2nd, at the program updates process of NOR Flash; The erase process of wherein said NOR Flash is:
1) system waits for the arrival of erase command under the S0 state, and after CPU sends erase command, NOR Flash controller will be prepared NOR Flash is wiped, and this moment, system entered the S1 state;
2) at the S1 state, NOR Flash controller begins NOR Flash is carried out erase operation; Need the regular hour owing to once wipe, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in once wiping, OLT does not send the OAM frame, then gets back to the S0 waiting status from the S1 state through the P1 flow process; If the OAM frame, then need to enter the S2 state through the P2 flow process;
3) at the S2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the S3 state;
4) at the S3 state, system will utilize register to recover on-the-spot, continue to carry out wiping NOR Flash;
5) if wipe and finish, then system enters the S0 waiting status, waits for new erase command;
6) if NOR Flash wipes to finish, need interrupt, be used for the CPU issued transaction to CPU.
Described program updates process is:
1) system waits for the arrival of program updates order under the C0 state, after CPU sends the program updates order, NOR Flash controller will take out the routine data of required renewal from RAM, prepare NOR Flash is carried out write operation, be refresh routine, this moment, system entered the C1 state;
2) at the C1 state, NOR Flash controller is carried out write operation to NOR Flash; Because a program updates needs the regular hour, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in program updates process, OLT does not send the OAM frame, then get back to the C0 waiting status through the P1 flow process from the C1 state; If the OAM frame, then need to enter the C2 state through the P2 flow process;
3) at the C2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the C3 state;
4) at the C3 state, system will utilize register to recover on-the-spot, continue to carry out the write operation to NOR Flash, promptly program information be write NOR Flash;
5) if program updates finishes, then system enters the C0 waiting status, waits for new operation;
Finish if NOR Flash upgrades, need interrupt, be used for the CPU issued transaction to CPU.
Method of the present invention has been applied to actual chip R﹠D process, and has passed through actual test, can finish the program updates operation.
Description of drawings
Fig. 1 is that the structure of existing EPON system is formed synoptic diagram.
Fig. 2 is that structure of the present invention is formed synoptic diagram.
Fig. 3 is a NOR Flash erase process block diagram of the present invention.
Fig. 4 is the program updates process block diagram of NOR Flash of the present invention.
Embodiment
The present invention will be described in detail below in conjunction with accompanying drawing: EPON of the present invention system is the network system of a kind of point to multiple spot, and it mainly comprises three parts: local side OLT, terminal (user side) ONU and passive optical splitter ODN; Shown in Figure 2: described EPON terminal system method for updating program mainly comprises:
The receive logic of a, OAM: when OLT carries out program updates by the OAM mode to ONU, need carry the program of need upgrading by the OAM frame, and send to CPU, in this process, the receive logic that needs OAM is finished the reception to the OAM frame, and sends to CPU;
B, CPU:CPU mainly finish the parsing to the OAM frame, extract the contents of program that needs renewal, and initiate the renewal operation to NOR Flash;
C, NOR Flash controller: because CPU itself do not control NOR Flash, therefore, need NOR Flash controller and finish operation, operation such as comprise reading and writing, wipe to NOR Flash to NOR Flash;
D, ram space: after CPU has resolved the OAM frame, can the program that needs upgrade temporarily be stored among the RAM, select suitable chance to write NOR Flash then;
E, other hardware auxiliary logics comprise interruptable controller, register etc.
In above-mentioned described part of the present invention (a), also comprise:
1) OAM frame receive logic might receive non-OAM frame, need abandon non-OAM frame, in the EPON system, judge that whether a frame is that the method for OAM frame is: the Lengty/Type territory of ethernet frame is if 0x8809, then present frame is the OAM frame, otherwise not being, then is non-OAM frame, and this receive logic need abandon present frame;
2) OAM frame receive logic need judge whether frame is effective, whether the FCS territory that is frame is correct: when carrying out the transmission of Frame in network, might disturb situation that error in data occur because of signal, this can be by carrying out the CRC32 verification to frame, is added on the frame end as the FCS territory of frame; And OAM frame receive logic needs to judge whether the FCS territory is correct when receiving, if incorrect, then abandons current OAM frame;
3) the present invention proposes and utilize OAM frame receive logic (hardware approach) to carry out the judgement in FCS territory, can offloading the CPU, improve treatment effeciency;
In above-mentioned described part of the present invention (b), also comprise:
1) CPU can be 8 bit CPUs, 16CPU or 32 bit CPUs, and the present invention does not limit selected cpu type;
2) CPU need handle according to the standard definition form of OAM when resolving the OAM frame, and the present invention is based on the defined OAM form of IEEE802.3, but is not limited in the defined OAM form of IEEE802.3 agreement;
3) CPU can be the refresh routine information temporary storage that extracts from the OAM frame in RAM when resolving the OAM frame; But only not limiting, the present invention can not use RAM;
In above-mentioned part of the present invention (c), also comprise:
1) operation that need finish NOR Flash of NOR Flash comprises: reading and writing and wiping.Erase operation can comprise to be wiped or sector erasing the sheet of NOR Flash;
2) the present invention do not limit be by the type of NOR Flash, thus, the present invention does not limit the operating characteristic of NOR Flash;
In above-mentioned part of the present invention (d), also comprise:
1) use the metadata cache space of RAM among the present invention as refresh routine, but the present invention do not limit be by the RAM capacity;
2) can select to use the metadata cache space of other types, for example SDRAM etc.; Based on above-mentioned part of the present invention, when the EPON terminal system method for updating program of realizing based on NOR Flash, the present invention has comprised two processes: at the erase process of NOR Flash and at the program updates process of NOR Flash.
Erase process is as shown in Figure 3:
1) system waits for the arrival of erase command under the S0 state, and after CPU sends erase command, NOR Flash controller will be prepared NOR Flash is wiped, and this moment, system entered the S1 state;
2) at the S1 state, NOR Flash controller begins NOR Flash is carried out erase operation; Need the regular hour owing to once wipe, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in once wiping, OLT does not send the OAM frame, then gets back to the S0 waiting status from the S1 state through the P1 flow process; If the OAM frame, then need to enter the S2 state through the P2 flow process;
3) at the S2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the S3 state;
4) at the S3 state, system will utilize register to recover on-the-spot, continue to carry out wiping NOR Flash;
Finish if wipe, then system enters the S0 waiting status, waits for new erase command; If NOR Flash wipes finish, need interrupt, be used for the CPU issued transaction to CPU.
The program updates process is as shown in Figure 4:
1) system waits for the arrival of program updates order under the C0 state, after CPU sends the program updates order, NOR Flash controller will take out the routine data of required renewal from RAM, prepare NOR Flash is carried out write operation, be refresh routine, this moment, system entered the C1 state;
2) at the C1 state, NOR Flash controller is carried out write operation to NOR Flash; Because a program updates needs the regular hour, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in program updates process, OLT does not send the OAM frame, then get back to the C0 waiting status through the P1 flow process from the C1 state; If the OAM frame, then need to enter the C2 state through the P2 flow process;
3) at the C2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the C3 state;
4) at the C3 state, system will utilize register to recover on-the-spot, continue to carry out the write operation to NOR Flash, promptly program information be write NOR Flash;
5) if program updates finishes, then system enters the C0 waiting status, waits for new operation; Finish if NOR Flash upgrades, need interrupt, be used for the CPU issued transaction to CPU.
Claims (7)
1. EPON terminal system method for updating program based on NOR Flash, described EPON system is the network system of a kind of point to multiple spot, it mainly comprises three parts: local side OLT, terminal (user side) ONU and passive optical splitter ODN; It is characterized in that described EPON terminal system method for updating program, mainly comprise:
The receive logic of a, OAM: when OLT carries out program updates by the OAM mode to ONU, need carry the program of need upgrading by the OAM frame, and send to CPU, in this process, the receive logic that needs OAM is finished the reception to the OAM frame, and sends to CPU;
B, CPU:CPU mainly finish the parsing to the OAM frame, extract the contents of program that needs renewal, and initiate the renewal operation to NOR Flash;
C, NOR Flash controller: because CPU itself do not control NOR Flash, therefore, need NOR Flash controller and finish operation, operation such as comprise reading and writing, wipe to NOR Flash to NOR Flash;
D, ram space: after CPU has resolved the OAM frame, can the program that needs upgrade temporarily be stored among the RAM, select suitable chance to write NOR Flash then;
E, other hardware auxiliary logics comprise interruptable controller, register etc.
2. the EPON terminal system method for updating program based on NOR Flash according to claim 1 is characterized in that also comprising in the described part (a):
1) OAM frame receive logic might receive non-OAM frame, need abandon non-OAM frame, in the EPON system, judge that whether a frame is that the method for OAM frame is: the Lengty/Type territory of ethernet frame is if 0x8809, then present frame is the OAM frame, otherwise not being, then is non-OAM frame, and this receive logic need abandon present frame;
2) OAM frame receive logic need judge whether frame is effective, whether the FCS territory that is frame is correct: when carrying out the transmission of Frame in network, might disturb situation that error in data occur because of signal, this can be by carrying out the CRC32 verification to frame, is added on the frame end as the FCS territory of frame; And OAM frame receive logic needs to judge whether the FCS territory is correct when receiving, if incorrect, then abandons current OAM frame;
3) the present invention proposes and utilize OAM frame receive logic (hardware approach) to carry out the judgement in FCS territory, can offloading the CPU, improve treatment effeciency;
3. the EPON terminal system method for updating program based on NOR Flash according to claim 1 is characterized in that also comprising in the described part (b):
1) CPU can be 8 bit CPUs, 16CPU or 32 bit CPUs, and the present invention does not limit selected cpu type;
2) CPU need handle according to the standard definition form of OAM when resolving the OAM frame, and the present invention is based on the defined OAM form of IEEE802.3, but is not limited in the defined OAM form of IEEE802.3 agreement;
3) CPU is when resolving the OAM frame, can the refresh routine information temporary storage that from the OAM frame, extracts in RAM but the present invention only do not limit and can use RAM;
4. the EPON terminal system method for updating program based on NOR Flash according to claim 1 is characterized in that also comprising in the described part (c):
1) operation that need finish NOR Flash of NOR Flash comprises: reading and writing and wiping.Erase operation can comprise to be wiped or sector erasing the sheet of NOR Flash;
2) the present invention do not limit be by the type of NOR Flash, thus, the present invention does not limit the operating characteristic of NOR Flash;
5. the EPON terminal system method for updating program based on NOR Flash according to claim 1 is characterized in that also comprising in the described part (d):
1) use the metadata cache space of RAM among the present invention as refresh routine, but the present invention do not limit be by the RAM capacity;
2) can select to use the metadata cache space of other types, for example SDRAM etc.;
6. the EPON terminal system method for updating program based on NOR Flash according to claim 1, it is characterized in that described EPON terminal system method for updating program based on NOR Flash, consist predominantly of following two processes: the one, at the erase process of NOR Flash, the 2nd, at the program updates process of NOR Flash; The erase process of wherein said NOR Flash is:
1) system waits for the arrival of erase command under the S0 state, and after CPU sends erase command, NOR Flash controller will be prepared NOR Flash is wiped, and this moment, system entered the S1 state;
2) at the S1 state, NOR Flash controller begins NOR Flash is carried out erase operation; Need the regular hour owing to once wipe, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in once wiping, OLT does not send the OAM frame, then gets back to the S0 waiting status from the S1 state through the P1 flow process; If the OAM frame, then need to enter the S2 state through the P2 flow process;
3) at the S2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the S3 state;
4) at the S3 state, system will utilize register to recover on-the-spot, continue to carry out wiping NOR Flash;
5) if wipe and finish, then system enters the S0 waiting status, waits for new erase command;
6) if NOR Flash wipes to finish, need interrupt, be used for the CPU issued transaction to CPU.
7. the EPON terminal system method for updating program based on NOR Flash according to claim 6 is characterized in that described program updates process is:
1) system waits for the arrival of program updates order under the C0 state, after CPU sends the program updates order, NOR Flash controller will take out the routine data of required renewal from RAM, prepare NOR Flash is carried out write operation, be refresh routine, this moment, system entered the C1 state;
2) at the C1 state, NOR Flash controller is carried out write operation to NOR Flash; Because a program updates needs the regular hour, during this period of time, need to utilize the OAM frame to keep guaranteeing the unobstructed of link between OLT and the ONU.If in program updates process, OLT does not send the OAM frame, then get back to the C0 waiting status through the P1 flow process from the C1 state; If the OAM frame, then need to enter the C2 state through the P2 flow process;
3) at the C2 state, system will utilize the current field data of register holds, handle the OAM frame then, after handling the OAM frame, will enter the C3 state;
4) at the C3 state, system will utilize register to recover on-the-spot, continue to carry out the write operation to NOR Flash, promptly program information be write NOR Flash;
5) if program updates finishes, then system enters the C0 waiting status, waits for new operation;
Finish if NOR Flash upgrades, need interrupt, be used for the CPU issued transaction to CPU.
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