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Hi, everyone. I have problem when trying to acces the SDRAM which is provide by the DSKBoard. I am using DSKBoard 6711 rev.2 which have two SDRAM Chip from Micron MT48LC16MA2. This SDRAM will have 8 bank (4 bank for each SDRAM chip). The address of all the SDRAM will be 0x80000000,0x81000000,0x82000000,0x83000000, .. I have tried to access the SDRAM using several method but it seems fail. The bank slot that I successfull to access is bank 0 at 0x80000000. The method that I use are: 1. I am trying to access 0x81000000 by the pragma #pragma DATA_SECTION(frame,".my_section") unsigned int frame[4096]; void main() { unsigned int i; for(i=0;i<255;i++) frame[i]=0x12345678; } Comment: for this method I successfully allocate the frame variable to the address 0x81000000. But I couldnt write data to the frame. So when I view memory at address 0x81000000 the address doesnt contain my data which is 0x12345678. 2. The second method I use to allocate is using pointer. void main() { unsigned int *j; j=(unsigned int*)0x81000000; *j=0x12345678; } This method is successfully point to the address 0x81000000, but again I am fail to write 0x12345678 to the address 0x81000000 So the question that I would like to ask that I want to access the address of the SDRAM in 0x81000000, 0x82000000.. for Read and Write. Should I use the EMIF to access the SDRAM. If I should use the EMIF could anyone told me what is the correct EMIF setting for the SDRAM. Because I have also use the EMIF to access the address. TIA Henrry Andrian |
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SDRAM
Started by ●May 23, 2003
Reply by ●May 23, 20032003-05-23
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Check the GEL script that CCS runs when it connects to the board. This script sets upp the EMIF with the correct timing parameters. /Regards, P Ligander Henrry Andrian wrote: >Hi, everyone. I have problem when trying to acces the SDRAM which is >provide by the DSKBoard. I am using DSKBoard 6711 rev.2 which have >two SDRAM Chip from Micron MT48LC16MA2. This SDRAM will have 8 bank >(4 bank for each SDRAM chip). The address of all the SDRAM will be >0x80000000,0x81000000,0x82000000,0x83000000, .. I have tried to >access the SDRAM using several method but it seems fail. The bank >slot that I successfull to access is bank 0 at 0x80000000. The >method that I use are: >1. I am trying to access 0x81000000 by the pragma > #pragma DATA_SECTION(frame,".my_section") > unsigned int frame[4096]; > >void main() > { > unsigned int i; > >for(i=0;i<255;i++) > frame[i]=0x12345678; > } > >Comment: for this method I successfully allocate the frame variable >to the address 0x81000000. But I couldnt write data to the frame. So >when I view memory at address 0x81000000 the address doesnt contain >my data which is 0x12345678. > >2. The second method I use to allocate is using pointer. > void main() > { > unsigned int *j; > >j=(unsigned int*)0x81000000; > *j=0x12345678; > } > >This method is successfully point to the address 0x81000000, but >again I am fail to write 0x12345678 to the address 0x81000000 > >So the question that I would like to ask that I want to access the >address of the SDRAM in 0x81000000, 0x82000000.. for Read and Write. >Should I use the EMIF to access the SDRAM. If I should use the EMIF >could anyone told me what is the correct EMIF setting for the SDRAM. >Because I have also use the EMIF to access the address. > >TIA > >Henrry Andrian >_____________________________________ >Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > >_____________________________________ >About this discussion group: > >To Join: Send an email to > >To Post: Send an email to > >To Leave: Send an email to > >Archives: http://www.yahoogroups.com/group/c6x > >Other Groups: http://www.dsprelated.com >">http://docs.yahoo.com/info/terms/ > > |
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Reply by ●May 24, 20032003-05-24
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Hi, The address of the SDRAM is 0x80000000 to 0x80FFFFFF which is 16 MB. The address is not split up into blocks as you said (The address of all the SDRAM will be 0x80000000,0x81000000,0x82000000,0x83000000, .. ).So you can not access 0x81000000 address. Thanks, Ramanan. ----- Original Message ----- From: "Henrry Andrian" <> To: <> Sent: Friday, May 23, 2003 7:21 AM Subject: [c6x] SDRAM > Hi, everyone. I have problem when trying to acces the SDRAM which is > provide by the DSKBoard. I am using DSKBoard 6711 rev.2 which have > two SDRAM Chip from Micron MT48LC16MA2. This SDRAM will have 8 bank > (4 bank for each SDRAM chip). The address of all the SDRAM will be > 0x80000000,0x81000000,0x82000000,0x83000000, .. I have tried to > access the SDRAM using several method but it seems fail. The bank > slot that I successfull to access is bank 0 at 0x80000000. The > method that I use are: > 1. I am trying to access 0x81000000 by the pragma > #pragma DATA_SECTION(frame,".my_section") > unsigned int frame[4096]; > > void main() > { > unsigned int i; > > for(i=0;i<255;i++) > frame[i]=0x12345678; > } > > Comment: for this method I successfully allocate the frame variable > to the address 0x81000000. But I couldnt write data to the frame. So > when I view memory at address 0x81000000 the address doesnt contain > my data which is 0x12345678. > > 2. The second method I use to allocate is using pointer. > void main() > { > unsigned int *j; > > j=(unsigned int*)0x81000000; > *j=0x12345678; > } > > This method is successfully point to the address 0x81000000, but > again I am fail to write 0x12345678 to the address 0x81000000 > > So the question that I would like to ask that I want to access the > address of the SDRAM in 0x81000000, 0x82000000.. for Read and Write. > Should I use the EMIF to access the SDRAM. If I should use the EMIF > could anyone told me what is the correct EMIF setting for the SDRAM. > Because I have also use the EMIF to access the address. > > TIA > > Henrry Andrian > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: Send an email to > > To Post: Send an email to > > To Leave: Send an email to > > Archives: http://www.yahoogroups.com/group/c6x > > Other Groups: http://www.dsprelated.com > ">http://docs.yahoo.com/info/terms/ > |
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Reply by ●May 25, 20032003-05-25
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--- Ramanan <> wrote: > Hi, > The address of the SDRAM is 0x80000000 to > 0x80FFFFFF which is 16 MB. The > address is not split up into blocks as you said (The > address of all the > SDRAM will be > 0x80000000,0x81000000,0x82000000,0x83000000, .. ).So > you can > not access 0x81000000 address. > > Thanks, > Ramanan. Thx, Thats why I couldnt access to the address. At first I taught that the DSK provide 32 MB. But after I have seen the schematic. it seem that it only provide 16 MB. ===== __________________________________ |
