Flash memory of F28335

Phien Nguyen

Hi,

I have read "EEPROM Emulation With the TMS320F28xxx DSCs" and i'm successful when add this example to my project (write/read some data in 28335's memory used calib ADC).

Flash structure: flash --> sector --> bank --> page. So, for 28335: how many banks in a sector and how many pages in a bank? It isn't consistency in application report and comment in example.

Thanks.

over 10 years ago

0 Gautam Iyer over 10 years ago

Guru 192875 points

Hi Phien,

It is possible to create a large number of pages depending on the size of Flash sectors and the emulated
EEPROM. For example a 4K x 16 size Flash sector can be divided into 32 pages, each having a size of
128 x 16. That makes each Page equivalent to a 256 x 8 Bytes EEPROM.

If you check the example code, 8 banks and 8pages within a bank structure is used.

From datasheet you'll get each sector's space. So in this way you can calculate the number of banks and pages that can be assigned for a device.

Regards,

Gautam

0 Phien Nguyen over 10 years ago in reply to Gautam Iyer

Intellectual 540 points

Hi Gautam,

In example code, a sector is divided into 8banks (1 bank = 8 pages). So, size of page is 512 words.

But comment in example code wrote:

//Each page holds 64 data words
//Page size = Page_status word + 64W = 65W
//Bank Size = Bank_status word + 8 * Page size = 1 + 8*65 = 521W

Thanks

0 Phien Nguyen over 10 years ago in reply to Phien Nguyen

Intellectual 540 points

i think i make a mistake here. In example code, they only used 521*8 words of flash to create eeprom. isn't it?

They divided it into banks, pages to easier management. We needn't to divided flash memory, or divided it smaller such as: 16banks and 4 pages. Because only when i erase flash we must erase entire a sector, but when read, write i can execute for every word in sector. Is it right ?

Thanks

0 Gautam Iyer over 10 years ago in reply to Phien Nguyen

Guru 192875 points

16banks and 4 pages. Because only when i erase flash we must erase entire a sector, but when read, write i can execute for every word in sector. Is it right ?

True!

Regards,

Gautam

0 Phien Nguyen over 10 years ago in reply to Gautam Iyer

Intellectual 540 points

Thank you Gautam

0 Gautam Iyer over 10 years ago in reply to Phien Nguyen

Guru 192875 points

You're Welcome!

Goodluck & Regards,

Gautam

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Flash memory of F28335