[U-Boot-Users] flash interconnection
Hi All
I'm observing electric diagram of Freescale board PQ27e-ADS (MPC8272) about the interconnection between cpu MPC 8272 and flash memory. The data bus is linked inverted, i.e., flash DQ0 is connected to processor DQ7, flash DQ7 is connected to processor DQ0. For the other bytes it is the same (flash DQ8 is connected to processor DQ15 and so on).
My question: Is it possible to connect the flash memory to the processor in a different way (such as flash DQ0 to processor DQ15, flash DQ1 to proc. DQ14, ..., flash DQ15 to proc. DQ0)? Is there a pin or register to configure the processor to behave this way?
I've been searching for this in data sheet of MPC8272, but I didn't find any information about this.
Regards,
Tiago
In message 9c1c9eb80604281305k680939d4j3dd957d0cf0b7530@mail.gmail.com you wrote:
I'm observing electric diagram of Freescale board PQ27e-ADS (MPC8272) about the interconnection between cpu MPC 8272 and flash memory. The data bus is linked inverted, i.e., flash DQ0 is connected to processor DQ7, flash DQ7 is connected to processor DQ0. For the other bytes it is the same (flash DQ8 is connected to processor DQ15 and so on).
No, the busses are NOT inverted, they are connected correctly, i. e. LSB with LSB and MSB with MSB.
Please check in the User's Manual how PowerPC systems number the bit (bit 0 = MSB).
My question: Is it possible to connect the flash memory to the processor in a different way (such as flash DQ0 to processor DQ15, flash DQ1 to proc. DQ14, ..., flash DQ15 to proc. DQ0)? Is there a pin or register to configure
This is possible. But why would you want to do that? You can do all kinds of funny things. But don't expect that all funny things will work, though.
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Best regards,
Wolfgang Denk
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