Hello!
I've designed controller for NVRAM memory with SPI interface.
I've create component as memory slave device with 8 bit data bus (I don't want to use
this as register slave).
When I write to memory all is OK (address, cs, write signals are correct), but when I was tried to read
address bus is wrong.
For example:
unsigned char *p = (unsigned char*) FRAM1_BASE;
int main(void)
{
p[0] = (unsigned char) 0xDC;
printf("%02x\n", (unsigned char) p[0]);
p[1] = (unsigned char) 0xCD;
printf("%02x\n", (unsigned char) p[1]);
return 0;
}
I've simuleted it and got next:
When to p[0] or p[1] I write some value it is writing correct,
but when it is reading - address bus sets to 0, after to 1, after to 2, after to 3 (in both case).
All this time chipselect is active and read signal too.
Therefore when I'm reading p[1], there always p[0], because p[0] was read first.
What's wrong?
Any idea?
Thx.
