On 03/10/2016 07:11 PM, Jagan Teki wrote:
On Thursday 10 March 2016 06:42 PM, Purna Chandra Mandal wrote:
PIC32 embedded flash banks are memory mapped, directly read by CPU, and programming (erase followed by write) operation on them are handled by on-chip NVM controller.
Can you please add some more description to understand bit more, which kind of flash it is, parallel NOR?
Jagan,
These are parallel NOR flash divided into number of banks to allow erase/programming in one while fetch/execution continues from other. As the flash is memory-mapped code stored can be directly executed from flash (XIP), also there is additional hardware logic to prefetch and cache contents to improve code execution. These flash can also be used to store user data.
In PIC32 there are two sets of embedded flash memory of same type - boot flash, and program flash; early-boot-code executes from boot-flash and one bank of program-flash is used for u-boot, other bank for environment.
thanks!
Jagan.