U15 Address Decoder - ZiLOG eZ80L92 User Manual

wire nCS_EX,
nmemen1,
nmemen2,
nmemen3,
nmemen4;
//wire MOD_DIS =
((nmemen1==0)|(nmemen2==0)|(nmemen3==0)|(nmemen4==0));//if any
wire nEXP_EN = ~((nCS0==0)&(A7==0)&(A6==1));//expansion module
//wire nDIS_FL = (nFL_DIS) ? ~nEXP_EN : ~(nFL_DIS);
wire nDIS_FL = nFL_DIS & nEXP_EN; //if either of them is 0 Flash is
assign nCS_EX = (nEX_FL_DIS) ? nEXP_EN : ~(nEX_FL_DIS);
assign nL_RD =
~((nmemen1==0)|(nmemen2==0)|(nmemen3==0)|(nmemen4==0)|(nEM_EN==
0)|(nCS_EX==0));
assign nmemen4 = ~((nCS2==0)&({A7,A6,A5,A4,A3}==5'h17));
assign nmemen3 = ~((nCS2==0)&({A7,A6,A5,A4,A3}==5'h16));
assign nmemen2 = ~((nCS2==0)&({A7,A6,A5,A4,A3}==5'h15));
assign nmemen1 = ~((nCS2==0)&({A7,A6,A5,A4,A3}==5'h14));
assign nEM_EN = ~((nCS2==0)&({A7,A6,A5,A4,A3,A2,A1,A0}==8'h80));
endmodule

U15 Address Decoder

`define anode
`define cathode
`define latch
®
// FOR eZ80 Development Platform Rev B
UM012906-0103
//of the signals is Low,
//Flash on the Module will be
//disabled if nDIS_FL is High
//Flash enabled if this is 0
//disabled
8'h00
8'h01
8'h02
PRELIMINARY
eZ80L92 Development Kit
User Manual
General Array Logic Equations
79