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[Altera_Forum]

`define flash_word // use word mode of flash 

`ifdef flash_word  wire flash_16bit_ip_a0;  assign oflash_byte_n = 1'b1; // flash word mode configuration `else  assign oflash_byte_n = 1'b0; // flash byte mode configuration `endif assign oflash_rst_n = 1'b1; // flash reset assign oflash_wp_n = 1'b1; // flash write protect/programming acceleration   assign odram1_clk = odram0_clk; //fishy   wire cpu_clk;  what is the purpose for the `ifdef flash_word  

[Altera_Forum]

It tests to see if the compile-time macro "FLASH_WORD" is defined. If so, it sets the signal "oFLASH_BYTE_N" to 1 otherwise it sets "oFLASH_BYTE_N" to 0. Clearly what this is doing is selecting between 8-bit and 16-bit mode on an external flash device. 

 Jake