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// ZXiznet project
// (c) NedoPC 2012-2018
//
// mapping of wiznet address space
module wizmap
(
//
input wire [15:0] za,
//
input wire w5300_a0inv,
input wire w5300_ports,
input wire [ 3:0] w5300_hi,
//
output wire [ 9:0] w5300_addr
);
reg [9:0] mem_w5300;
always @* mem_w5300[0] = w5300_a0inv ^ za[0];
always @*
if( za[13]==1'b0 )
begin
mem_w5300[9:1] = za[9:1];
end
else // if( za[13]==1'b1 )
begin
mem_w5300[9] = 1'b1;
mem_w5300[8:6] = za[11:9];
if( za[12]==1'b0 )
mem_w5300[5:1] = 5'b10111;
else // if( za[12]==1'b1 )
mem_w5300[5:1] = 5'b11000;
end
assign w5300_addr = w5300_ports ? {w5300_hi,za[13:9],za[8]^w5300_a0inv} : mem_w5300;
endmodule