Hello Friends,
Query Description:
I am looking into the possibility of parallel/simultaneous execution of CPU & Memory Controller.
I am refering into MC9S12GRMV1.pdf for my analysis.
I am referring two sections,
26.1.3 Block Diagram, Page no. 853
26.4.5 Allowed Simultaneous P-Flash and EEPROM Operations, Page no. 882
The block diagram shows that the 16 bit internal bus is shared between CPU & memory controller.
Table mentioned in 26.4.5 says that Program_Flash_Read is possible when we do Data_Flash_MarginRead, Data_Flash_Program, Data_Flash_SectorErase.
I having an scenario in which I have to erase the sector in Data_Flash.
During erase, asynchronously I want to execute the program on CPU by reading the instructions from Program_Flash.
That means Data_Flash erase is happening in polling mode.
Table mentioned in 26.4.5 says that it's possible, however after looking into the 26.1.3 Block Diagram (Shared Bus), I got confused.
Query:
1. How the simultaneous execution on CPU & memory controller is possible if they both are using the same internal bus.
2. If simulatanous execution is not possible, then where the "26.4.5 Allowed Simultaneous P-Flash and EEPROM Operations" will be applicable?
I have attached the datasheet with this post.
Please let me know, incase any additional information is required.
Thanks in Advance.
- GURU
