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Hi,
I want to use a nor flash device to boot at startup (using the controller AT91SAM9260). But there are different kinds of flash devices and I'm not sure if it's possible to do that.
I tested the AT49BV160DT, where I have to write one command to the flash to read the data from the flash. Unfortunately I'm not able to boot from this flash (together with keil uvision).
From the datasheet of the flash: A RESET input pin is provided to ease some system applications. When RESET is at a logic high level, the device is in its standard operating mode. A low level on the RESET input halts the present device operation and puts the outputs of the device in a high impedance state. When a high level is reasserted on the RESET pin, the device returns to the read mode, depending upon the state of the control inputs.
After that I tested the spansion flash device S29GL032D, but Im not able to communicate with this device. I'm not sure if it is not possible.
Now I found out that ST or Numonyx also have such flash devices but is it possible to boot from these devices?
A Hardware Reset is achieved by holding Reset/Block Temporary Unprotect Low, VIL, for at least tPLPX. After Reset/Block Temporary Unprotect goes High, VIH, the memory will be ready for Bus Read and Bus Write operations after tPHEL or tRHEL, whichever occurs last.
I think it will be not possible because it's nearly the same text like in the datasheet from the atmel device.
I hope someone of you could help me to find a right flash device. Maybe you're using such a flash device, where you can boot at startup
thanks in advance for your help
best regards Stefan