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from lots of pdfs about 5402 of the web of ti,i found that the bootloader address is from 8000h to ffffh, which make the total memoty size is 32k,but my flash is 256K*16,my question is whether my flash wasted? if my program is larger than 32k,how can i do? my english is not good,please forgive me |
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a doubtful question about 5402 dsk bootloader !!
Started by ●May 17, 2004
Reply by ●May 17, 20042004-05-17
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tjuantiangel wrote: > from lots of pdfs about 5402 of the web of ti,i found that > the bootloader address is from 8000h to ffffh, which make > the total memoty size is 32k,but my flash is 256K*16,my question is > whether my flash wasted? > if my program is larger than 32k,how can i do? > > my english is not good,please forgive me In the 5402 bootloader is actually mapped to 0xF000 to 0xFEFF, so you still have external access up to 0xEFFF -- but this is only with MP/MC=0, if you have MP/MC set to 1 then everything from 0x4000-0xFFFF is mapped to your external flash. Also, the 54xx series supports extra pages above 0xFFFF using A16-A19 so only a small amount of your flash will be unavailable if MP/MC=0 Brian -- ----------------- Brian C. Lane (W7BCL) Programmer www.shinemicro.com RF, DSP & Microcontroller Design |
Reply by ●May 18, 20042004-05-18
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You do have access to all 256k words of the Flash memory on the 5402 DSK. However you only have access to one 32k page of the memory at a time. The setting of M_PG0 to M_PG4 determine what page you have access to. You set the value of M_PG0-4 by writing to the DMCTRL register at I/O address 2h. For example, if they are all cleared to zero, you have access to sector 0 of the flash at flash addreses 0h to 7FFFh. If you set M_PG4=0, M_PG3=0, M_PG2=1, M_PG1=1 and M_PG0=1, that would be page seven and you would have access to flash sectors 7, 8, 9 and 10. It's all in CCS -> Help -> TMS3205402 DSK. For bootloading a large application look at document spra773. -Micah ________________________________________________________________________ > > Message: 4 > Date: Mon, 17 May 2004 09:09:38 -0000 > From: "tjuantiangel" <> > Subject: a doubtful question about 5402 dsk > bootloader !! > > from lots of pdfs about 5402 of the web of ti,i > found that > the bootloader address is from 8000h to ffffh, > which make > the total memoty size is 32k,but my flash is > 256K*16,my question is > whether my flash wasted? > if my program is larger than 32k,how can i do? > > my english is not good,please forgive me ________________________________________________________________________ > > Message: 6 > Date: Mon, 17 May 2004 09:04:25 -0700 > From: "Brian C. Lane" <> > Subject: Re: a doubtful question about 5402 dsk > bootloader !! > > tjuantiangel wrote: > > from lots of pdfs about 5402 of the web of ti,i > found that > > the bootloader address is from 8000h to ffffh, > which make > > the total memoty size is 32k,but my flash is > 256K*16,my question is > > whether my flash wasted? > > if my program is larger than 32k,how can i do? > > > > my english is not good,please forgive me > > In the 5402 bootloader is actually mapped to 0xF000 > to 0xFEFF, so you > still have external access up to 0xEFFF -- but this > is only with > MP/MC=0, if you have MP/MC set to 1 then everything > from 0x4000-0xFFFF > is mapped to your external flash. > > Also, the 54xx series supports extra pages above > 0xFFFF using A16-A19 so > only a small amount of your flash will be > unavailable if MP/MC=0 > > Brian > > -- > ----------------- > Brian C. Lane (W7BCL) > Programmer > www.shinemicro.com RF, DSP & Microcontroller > Design > __________________________________ |
