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how to extend the address bus of the onboard FLASH(4M) of EVM_DM642

Started by X.Y. April 17, 2006
I just find that the FLASH is 4M and it has 22 add lines. The add
lines[0:18] are connected to the DM642 directly, while [19:21] are
connected to FPGA. I guess that they use the FPGA as a address decoder
to implement paging. However, I don't know how it decode. I mean that
what the logic is. Are there any other pin of EMIF connected to the
FPGA  and used in the decode logic?