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Hi, Im trying to interface a compact flash card to a Spartan2 FPGA in TrueIDE mode.I am having two main problems 1)My LBA address is being ignored. If I write data to one address and read a different address, I still get the data back.Checking the Cylinder High\low registers etc they do contain the LBA adress I want, but the card just seems to ignore it 2)Also if i try and read read more than one sector (i.e change the sector count registor to greater than 1!) I just get 2 sectors repeated eg if I write 40 sectors and read 40, i get sectors 39 and 40 of the data I "wrote" 20 times! Below is the setup steps that I use when writing(reading similar) [I have "wait till the device is ready" loops after most steps] A)Hard reset B)Initilise Device Parameters C) Setup as Master LBA mode D) Soft reset E) Setup as Master LBA mode F) Write Sector Count Register G) Write the LBA address(Sector Num Reg., Cylinder High\low,DeviceHead Reg) H)Write the "Write Sectors command"("Read sectors command" when reading) I)Wait transfer ready J)Write word....I and J loop till completion If anyone here has any experience with compactflash(or hard drive) interfacing your help would be much apreciated.At my wits end!! Thanks Alan |
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IDE interface....compact flash
Started by ●September 2, 2003
Reply by ●September 3, 20032003-09-03
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Hi Alan, I got Tony Burch's B5_Compact_Flash Working in 8 bit mode with a 6800/1 CPU. I wrote routines to read and write single sectors but I have not tried it with multiple blocks. How are you using the Compact Flash ? ie. are you using dedicated hardware to read the sectors, or are you using a CPU ? I'd offer to look at your code, and perhaps try it out on my board, if you wanted. John. yeloohwnala wrote: >Hi, > Im trying to interface a compact flash card to a Spartan2 FPGA in >TrueIDE mode.I am having two main problems >1)My LBA address is being ignored. If I write data to one address and >read a different address, I still get the data back.Checking the >Cylinder High\low registers etc they do contain the LBA adress I >want, but the card just seems to ignore it >2)Also if i try and read read more than one sector (i.e change the >sector count registor to greater than 1!) I just get 2 sectors >repeated eg if I write 40 sectors and read 40, i get sectors 39 and >40 of the data I "wrote" 20 times! >Below is the setup steps that I use when writing(reading similar) >[I have "wait till the device is ready" loops after most steps] >A)Hard reset >B)Initilise Device Parameters >C) Setup as Master LBA mode >D) Soft reset >E) Setup as Master LBA mode >F) Write Sector Count Register >G) Write the LBA address(Sector Num Reg., Cylinder >High\low,DeviceHead Reg) >H)Write the "Write Sectors command"("Read sectors command" when >reading) >I)Wait transfer ready >J)Write word....I and J loop till completion > >If anyone here has any experience with compactflash(or hard drive) >interfacing your help would be much apreciated.At my wits end!! > Thanks > Alan > >To post a message, send it to: >To unsubscribe, send a blank message to: > >">http://docs.yahoo.com/info/terms/ -- http://members.optushome.com.au/jekent |
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Reply by ●September 3, 20032003-09-03
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Hi, my code is actually based around Tony's board/sample code also.I kept it in 16bit mode.The compact flash is interfaced toan XESS FPGA board which issues all instructions to it.I contacted Tony yesterday evening and he is working on new CompactFlash examples so he'll send them onto me when finished.If you wouldnt mind I could send you on my CF controller if you could just have a quick look at it.Its basically a large state machine stepping through my control signals....very repeditive. Maybe you would notice a control I am missing.No problem if you cant. Alan --- In , John Kent <jekent@o...> wrote: > Hi Alan, > > I got Tony Burch's B5_Compact_Flash Working in 8 bit mode with a 6800/1 CPU. > I wrote routines to read and write single sectors but I have not tried > it with multiple blocks. > How are you using the Compact Flash ? ie. are you using dedicated > hardware to read > the sectors, or are you using a CPU ? > > I'd offer to look at your code, and perhaps try it out on my board, if > you wanted. > > John. > > yeloohwnala wrote: > > >Hi, > > Im trying to interface a compact flash card to a Spartan2 FPGA in > >TrueIDE mode.I am having two main problems > >1)My LBA address is being ignored. If I write data to one address and > >read a different address, I still get the data back.Checking the > >Cylinder High\low registers etc they do contain the LBA adress I > >want, but the card just seems to ignore it > >2)Also if i try and read read more than one sector (i.e change the > >sector count registor to greater than 1!) I just get 2 sectors > >repeated eg if I write 40 sectors and read 40, i get sectors 39 and > >40 of the data I "wrote" 20 times! > >Below is the setup steps that I use when writing(reading similar) > >[I have "wait till the device is ready" loops after most steps] > >A)Hard reset > >B)Initilise Device Parameters > >C) Setup as Master LBA mode > >D) Soft reset > >E) Setup as Master LBA mode > >F) Write Sector Count Register > >G) Write the LBA address(Sector Num Reg., Cylinder > >High\low,DeviceHead Reg) > >H)Write the "Write Sectors command"("Read sectors command" when > >reading) > >I)Wait transfer ready > >J)Write word....I and J loop till completion > > > >If anyone here has any experience with compactflash(or hard drive) > >interfacing your help would be much apreciated.At my wits end!! > > Thanks > > Alan > > > > > > > >To post a message, send it to: > >To unsubscribe, send a blank message to: fpga-cpu- > > > >">http://docs.yahoo.com/info/terms/ > > > > > > > > > > > > -- > http://members.optushome.com.au/jekent |
Reply by ●September 3, 20032003-09-03
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Hi Alan, I had a suspician you might have been using Tony's code. I have not tried the state machine code yet, but I'm sure it works ok (on single sectors). I used it as the basis of my 6800 driver ie. finding out what commands to issue it, so I'm reasonably familiar with how it worked. I'm not 100% clear on what you are doing to interface the compact flash ... Do you have Tony's Compact Flash board wired up to the XESS board or are you using the XESS board to interface to one of Tony's boards running the Compact Flash code ? I've been helping a friend port some simple micrprocessor code to an XSA-100 board. From what I understand of the XSA-100 (if thats what you are using) is that it has a 6 bit DRAM chip and a 8 bit x 512K byte static RAM on the mother board (If you have that). I assume you are using the 16 Bit DRAM, in which case you must be using the DRAM controller logic as well. Check out www.retromicro.com . I think Doug had some problems with the DRAM Controller Code at one stage. There is updated DRAM code on the XESS web site I beleive. What might also be of some interest is that I noticed on the open cores web site a week or so ago, someone posted a MSDOS File reader. I think it was for compact flash. I think it was based around a microprocessor core though. It had the code for it under CVS. In any case, send the code over, and I'll have a look at it. I'll try intergrate it into my memory examine and change code which works on 16 bit SRAM, to see what it's doing. My email address should be on the top of this email. John. yeloohwnala wrote: >Hi, > my code is actually based around Tony's board/sample code also.I >kept it in 16bit mode.The compact flash is interfaced toan XESS FPGA >board which issues all instructions to it.I contacted Tony yesterday >evening and he is working on new CompactFlash examples so he'll send >them onto me when finished.If you wouldnt mind I could send you on my >CF controller if you could just have a quick look at it.Its basically >a large state machine stepping through my control signals....very >repeditive. Maybe you would notice a control I am missing.No problem >if you cant. > Alan > > -- http://members.optushome.com.au/jekent |
