i am debugging a prototype with MCF5307 and a 16x2 Flash memory.
The flash is connected to CS0, *WE, *OE, etc. but no read operation from the flash is working.
This is the CS0 configuration:
* ChipSelect 0 - FLASH */ MCF_CS0_CSAR = BASEADDR_FLASH>>16; MCF_CS0_CSCR = 0 | MCF_CS_CSCR_WS(6) | MCF_CS_CSCR_AA | MCF_CS_CSCR_PS_16; MCF_CS0_CSMR = MCF_CS_CSMR_BAM_4M | MCF_CS_CSMR_V;
As a first test, i try to read the part ID from the flash, but i don't get anything different data than 0xffff.
So i started to look at signals with the scope, with this test loop:
volatile unsigned short *baseaddress = (volatile unsigned short *)BASEADDR_FLASH;while(1) *(baseaddress + 0x555) = (unsigned short)0xAA;
In this simple loop, CS0 is correctly driven up and down at every write, but *WE remain high.
Every help is really appreciated,