| 1 |
20 |
robfinch |
// ============================================================================
|
| 2 |
|
|
// __
|
| 3 |
|
|
// \\__/ o\ (C) 2013 Robert Finch, Stratford
|
| 4 |
|
|
// \ __ / All rights reserved.
|
| 5 |
|
|
// \/_// robfinch<remove>@opencores.org
|
| 6 |
|
|
// ||
|
| 7 |
|
|
//
|
| 8 |
|
|
// This source file is free software: you can redistribute it and/or modify
|
| 9 |
|
|
// it under the terms of the GNU Lesser General Public License as published
|
| 10 |
|
|
// by the Free Software Foundation, either version 3 of the License, or
|
| 11 |
|
|
// (at your option) any later version.
|
| 12 |
|
|
//
|
| 13 |
|
|
// This source file is distributed in the hope that it will be useful,
|
| 14 |
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 15 |
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
| 16 |
|
|
// GNU General Public License for more details.
|
| 17 |
|
|
//
|
| 18 |
|
|
// You should have received a copy of the GNU General Public License
|
| 19 |
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
| 20 |
|
|
//
|
| 21 |
|
|
// ============================================================================
|
| 22 |
|
|
//
|
| 23 |
|
|
IFETCH:
|
| 24 |
|
|
begin
|
| 25 |
23 |
robfinch |
opc <= pc;
|
| 26 |
20 |
robfinch |
if (nmi_edge & !imiss & gie) begin // imiss indicates cache controller is active and this state is in a waiting loop
|
| 27 |
|
|
nmi_edge <= 1'b0;
|
| 28 |
|
|
wai <= 1'b0;
|
| 29 |
|
|
bf <= 1'b0;
|
| 30 |
|
|
if (em & !nmoi) begin
|
| 31 |
|
|
radr <= {spage[31:8],sp[7:2]};
|
| 32 |
|
|
radr2LSB <= sp[1:0];
|
| 33 |
|
|
wadr <= {spage[31:8],sp[7:2]};
|
| 34 |
|
|
wadr2LSB <= sp[1:0];
|
| 35 |
|
|
wdat <= {4{pc[31:24]}};
|
| 36 |
|
|
cyc_o <= 1'b1;
|
| 37 |
|
|
stb_o <= 1'b1;
|
| 38 |
|
|
we_o <= 1'b1;
|
| 39 |
|
|
case(sp[1:0])
|
| 40 |
|
|
2'd0: sel_o <= 4'b0001;
|
| 41 |
|
|
2'd1: sel_o <= 4'b0010;
|
| 42 |
|
|
2'd2: sel_o <= 4'b0100;
|
| 43 |
|
|
2'd3: sel_o <= 4'b1000;
|
| 44 |
|
|
endcase
|
| 45 |
|
|
adr_o <= {spage[31:8],sp[7:2],2'b00};
|
| 46 |
|
|
dat_o <= {4{pc[31:24]}};
|
| 47 |
|
|
sp <= sp_dec;
|
| 48 |
|
|
vect <= `BYTE_NMI_VECT;
|
| 49 |
|
|
state <= BYTE_IRQ1;
|
| 50 |
|
|
end
|
| 51 |
|
|
else begin
|
| 52 |
|
|
radr <= isp_dec;
|
| 53 |
|
|
wadr <= isp_dec;
|
| 54 |
|
|
wdat <= pc;
|
| 55 |
|
|
cyc_o <= 1'b1;
|
| 56 |
|
|
stb_o <= 1'b1;
|
| 57 |
|
|
we_o <= 1'b1;
|
| 58 |
|
|
sel_o <= 4'hF;
|
| 59 |
|
|
adr_o <= {isp_dec,2'b00};
|
| 60 |
|
|
dat_o <= pc;
|
| 61 |
|
|
vect <= `NMI_VECT;
|
| 62 |
|
|
state <= IRQ1;
|
| 63 |
|
|
end
|
| 64 |
|
|
end
|
| 65 |
|
|
else if (irq_i && !imiss & gie) begin
|
| 66 |
|
|
if (im) begin
|
| 67 |
|
|
wai <= 1'b0;
|
| 68 |
|
|
if (unCachedInsn) begin
|
| 69 |
|
|
if (bhit) begin
|
| 70 |
|
|
ir <= ibuf;
|
| 71 |
|
|
state <= em ? BYTE_DECODE : DECODE;
|
| 72 |
|
|
end
|
| 73 |
|
|
else
|
| 74 |
|
|
imiss <= `TRUE;
|
| 75 |
|
|
end
|
| 76 |
|
|
else begin
|
| 77 |
|
|
if (ihit) begin
|
| 78 |
|
|
ir <= insn;
|
| 79 |
|
|
state <= em ? BYTE_DECODE : DECODE;
|
| 80 |
|
|
end
|
| 81 |
|
|
else
|
| 82 |
|
|
imiss <= `TRUE;
|
| 83 |
|
|
end
|
| 84 |
|
|
end
|
| 85 |
|
|
else begin
|
| 86 |
|
|
bf <= 1'b0;
|
| 87 |
|
|
wai <= 1'b0;
|
| 88 |
|
|
if (em & !nmoi) begin
|
| 89 |
|
|
radr <= {spage[31:8],sp[7:2]};
|
| 90 |
|
|
radr2LSB <= sp[1:0];
|
| 91 |
|
|
wadr <= {spage[31:8],sp[7:2]};
|
| 92 |
|
|
wadr2LSB <= sp[1:0];
|
| 93 |
|
|
wdat <= {4{pc[31:24]}};
|
| 94 |
|
|
cyc_o <= 1'b1;
|
| 95 |
|
|
stb_o <= 1'b1;
|
| 96 |
|
|
we_o <= 1'b1;
|
| 97 |
|
|
case(sp[1:0])
|
| 98 |
|
|
2'd0: sel_o <= 4'b0001;
|
| 99 |
|
|
2'd1: sel_o <= 4'b0010;
|
| 100 |
|
|
2'd2: sel_o <= 4'b0100;
|
| 101 |
|
|
2'd3: sel_o <= 4'b1000;
|
| 102 |
|
|
endcase
|
| 103 |
|
|
adr_o <= {spage[31:8],sp[7:2],2'b00};
|
| 104 |
|
|
dat_o <= {4{pc[31:24]}};
|
| 105 |
|
|
sp <= sp_dec;
|
| 106 |
|
|
vect <= `BYTE_IRQ_VECT;
|
| 107 |
|
|
state <= BYTE_IRQ1;
|
| 108 |
|
|
end
|
| 109 |
|
|
else begin
|
| 110 |
|
|
radr <= isp_dec;
|
| 111 |
|
|
wadr <= isp_dec;
|
| 112 |
|
|
wdat <= pc;
|
| 113 |
|
|
cyc_o <= 1'b1;
|
| 114 |
|
|
stb_o <= 1'b1;
|
| 115 |
|
|
we_o <= 1'b1;
|
| 116 |
|
|
sel_o <= 4'hF;
|
| 117 |
|
|
adr_o <= {isp_dec,2'b00};
|
| 118 |
|
|
dat_o <= pc;
|
| 119 |
|
|
vect <= {vbr[31:9],irq_vect,2'b00};
|
| 120 |
|
|
state <= IRQ1;
|
| 121 |
|
|
end
|
| 122 |
|
|
end
|
| 123 |
|
|
end
|
| 124 |
|
|
else if (!wai) begin
|
| 125 |
|
|
if (unCachedInsn) begin
|
| 126 |
|
|
if (bhit) begin
|
| 127 |
|
|
ir <= ibuf;
|
| 128 |
|
|
state <= em ? BYTE_DECODE : DECODE;
|
| 129 |
|
|
end
|
| 130 |
|
|
else
|
| 131 |
|
|
imiss <= `TRUE;
|
| 132 |
|
|
end
|
| 133 |
|
|
else begin
|
| 134 |
|
|
if (ihit) begin
|
| 135 |
|
|
ir <= insn;
|
| 136 |
|
|
state <= em ? BYTE_DECODE : DECODE;
|
| 137 |
|
|
end
|
| 138 |
|
|
else
|
| 139 |
|
|
imiss <= `TRUE;
|
| 140 |
|
|
end
|
| 141 |
|
|
end
|
| 142 |
|
|
if (first_ifetch) begin
|
| 143 |
|
|
first_ifetch <= `FALSE;
|
| 144 |
|
|
if (em) begin
|
| 145 |
|
|
case(ir[7:0])
|
| 146 |
|
|
`TAY,`TXY,`DEY,`INY: begin y[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 147 |
|
|
`TAX,`TYX,`TSX,`DEX,`INX: begin x[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 148 |
|
|
`TSA,`TYA,`TXA,`INA,`DEA: begin acc[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 149 |
|
|
`TAS,`TXS: begin sp <= res8[7:0]; end
|
| 150 |
|
|
`ADC_IMM:
|
| 151 |
|
|
begin
|
| 152 |
|
|
acc[7:0] <= df ? bcaio : res8;
|
| 153 |
|
|
cf <= df ? bcaico : resc8;
|
| 154 |
|
|
// vf <= resv8;
|
| 155 |
|
|
vf <= (res8[7] ^ b8[7]) & (1'b1 ^ acc[7] ^ b8[7]);
|
| 156 |
|
|
nf <= df ? bcaio[7] : resn8;
|
| 157 |
|
|
zf <= df ? bcaio==8'h00 : resz8;
|
| 158 |
|
|
end
|
| 159 |
|
|
`ADC_ZP,`ADC_ZPX,`ADC_IX,`ADC_IY,`ADC_ABS,`ADC_ABSX,`ADC_ABSY,`ADC_I:
|
| 160 |
|
|
begin
|
| 161 |
|
|
acc[7:0] <= df ? bcao : res8;
|
| 162 |
|
|
cf <= df ? bcaco : resc8;
|
| 163 |
|
|
vf <= (res8[7] ^ b8[7]) & (1'b1 ^ acc[7] ^ b8[7]);
|
| 164 |
|
|
nf <= df ? bcao[7] : resn8;
|
| 165 |
|
|
zf <= df ? bcao==8'h00 : resz8;
|
| 166 |
|
|
end
|
| 167 |
|
|
`SBC_IMM:
|
| 168 |
|
|
begin
|
| 169 |
|
|
acc[7:0] <= df ? bcsio : res8;
|
| 170 |
|
|
cf <= ~(df ? bcsico : resc8);
|
| 171 |
|
|
vf <= (1'b1 ^ res8[7] ^ b8[7]) & (acc[7] ^ b8[7]);
|
| 172 |
|
|
nf <= df ? bcsio[7] : resn8;
|
| 173 |
|
|
zf <= df ? bcsio==8'h00 : resz8;
|
| 174 |
|
|
end
|
| 175 |
|
|
`SBC_ZP,`SBC_ZPX,`SBC_IX,`SBC_IY,`SBC_ABS,`SBC_ABSX,`SBC_ABSY,`SBC_I:
|
| 176 |
|
|
begin
|
| 177 |
|
|
acc[7:0] <= df ? bcso : res8;
|
| 178 |
|
|
vf <= (1'b1 ^ res8[7] ^ b8[7]) & (acc[7] ^ b8[7]);
|
| 179 |
|
|
cf <= ~(df ? bcsco : resc8);
|
| 180 |
|
|
nf <= df ? bcso[7] : resn8;
|
| 181 |
|
|
zf <= df ? bcso==8'h00 : resz8;
|
| 182 |
|
|
end
|
| 183 |
|
|
`CMP_IMM,`CMP_ZP,`CMP_ZPX,`CMP_IX,`CMP_IY,`CMP_ABS,`CMP_ABSX,`CMP_ABSY,`CMP_I,
|
| 184 |
|
|
`CPX_IMM,`CPX_ZP,`CPX_ABS,
|
| 185 |
|
|
`CPY_IMM,`CPY_ZP,`CPY_ABS:
|
| 186 |
|
|
begin cf <= ~resc8; nf <= resn8; zf <= resz8; end
|
| 187 |
|
|
`BIT_IMM,`BIT_ZP,`BIT_ZPX,`BIT_ABS,`BIT_ABSX:
|
| 188 |
|
|
begin nf <= b8[7]; vf <= b8[6]; zf <= resz8; end
|
| 189 |
|
|
`TRB_ZP,`TRB_ABS,`TSB_ZP,`TSB_ABS:
|
| 190 |
|
|
begin zf <= resz8; end
|
| 191 |
|
|
`LDA_IMM,`LDA_ZP,`LDA_ZPX,`LDA_IX,`LDA_IY,`LDA_ABS,`LDA_ABSX,`LDA_ABSY,`LDA_I,
|
| 192 |
|
|
`AND_IMM,`AND_ZP,`AND_ZPX,`AND_IX,`AND_IY,`AND_ABS,`AND_ABSX,`AND_ABSY,`AND_I,
|
| 193 |
|
|
`ORA_IMM,`ORA_ZP,`ORA_ZPX,`ORA_IX,`ORA_IY,`ORA_ABS,`ORA_ABSX,`ORA_ABSY,`ORA_I,
|
| 194 |
|
|
`EOR_IMM,`EOR_ZP,`EOR_ZPX,`EOR_IX,`EOR_IY,`EOR_ABS,`EOR_ABSX,`EOR_ABSY,`EOR_I:
|
| 195 |
|
|
begin acc[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 196 |
|
|
`ASL_ACC: begin acc[7:0] <= res8; cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 197 |
|
|
`ROL_ACC: begin acc[7:0] <= res8; cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 198 |
|
|
`LSR_ACC: begin acc[7:0] <= res8; cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 199 |
|
|
`ROR_ACC: begin acc[7:0] <= res8; cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 200 |
|
|
`ASL_ZP,`ASL_ZPX,`ASL_ABS,`ASL_ABSX: begin cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 201 |
|
|
`ROL_ZP,`ROL_ZPX,`ROL_ABS,`ROL_ABSX: begin cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 202 |
|
|
`LSR_ZP,`LSR_ZPX,`LSR_ABS,`LSR_ABSX: begin cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 203 |
|
|
`ROR_ZP,`ROR_ZPX,`ROR_ABS,`ROR_ABSX: begin cf <= resc8; nf <= resn8; zf <= resz8; end
|
| 204 |
|
|
`INC_ZP,`INC_ZPX,`INC_ABS,`INC_ABSX: begin nf <= resn8; zf <= resz8; end
|
| 205 |
|
|
`DEC_ZP,`DEC_ZPX,`DEC_ABS,`DEC_ABSX: begin nf <= resn8; zf <= resz8; end
|
| 206 |
|
|
`PLA: begin acc[7:0] <= res8; zf <= resz8; nf <= resn8; end
|
| 207 |
|
|
`PLX: begin x[7:0] <= res8; zf <= resz8; nf <= resn8; end
|
| 208 |
|
|
`PLY: begin y[7:0] <= res8; zf <= resz8; nf <= resn8; end
|
| 209 |
|
|
`LDX_IMM,`LDX_ZP,`LDX_ZPY,`LDX_ABS,`LDX_ABSY: begin x[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 210 |
|
|
`LDY_IMM,`LDY_ZP,`LDY_ZPX,`LDY_ABS,`LDY_ABSX: begin y[7:0] <= res8; nf <= resn8; zf <= resz8; end
|
| 211 |
|
|
endcase
|
| 212 |
|
|
end
|
| 213 |
|
|
else begin
|
| 214 |
|
|
regfile[Rt] <= res;
|
| 215 |
|
|
case(Rt)
|
| 216 |
|
|
4'h1: acc <= res;
|
| 217 |
|
|
4'h2: x <= res;
|
| 218 |
|
|
4'h3: y <= res;
|
| 219 |
|
|
default: ;
|
| 220 |
|
|
endcase
|
| 221 |
|
|
case(ir[7:0])
|
| 222 |
|
|
`TAY,`TXY,`DEY,`INY: begin y <= res; nf <= resn32; zf <= resz32; end
|
| 223 |
|
|
`TAX,`TYX,`TSX,`DEX,`INX: begin x <= res; nf <= resn32; zf <= resz32; end
|
| 224 |
23 |
robfinch |
`TAS,`TXS,`SUB_SP: begin isp <= res; gie <= 1'b1; end
|
| 225 |
20 |
robfinch |
`TSA,`TYA,`TXA,`INA,`DEA: begin acc <= res; nf <= resn32; zf <= resz32; end
|
| 226 |
|
|
`TRS:
|
| 227 |
|
|
begin
|
| 228 |
|
|
case(ir[15:12])
|
| 229 |
|
|
4'h0: begin
|
| 230 |
|
|
$display("res=%h",res);
|
| 231 |
|
|
icacheOn <= res[0];
|
| 232 |
|
|
dcacheOn <= res[1];
|
| 233 |
|
|
write_allocate <= res[2];
|
| 234 |
|
|
end
|
| 235 |
|
|
4'h1: dp <= res;
|
| 236 |
|
|
4'h5: lfsr <= res;
|
| 237 |
|
|
4'h6: dp8 <= res;
|
| 238 |
|
|
4'h7: abs8 <= res;
|
| 239 |
|
|
4'h8: begin vbr <= {res[31:9],9'h000}; nmoi <= res[0]; end
|
| 240 |
|
|
4'hE: begin sp <= res[7:0]; spage[31:8] <= res[31:8]; end
|
| 241 |
|
|
4'hF: begin isp <= res; gie <= 1'b1; end
|
| 242 |
|
|
endcase
|
| 243 |
|
|
end
|
| 244 |
|
|
`RR:
|
| 245 |
|
|
case(ir[23:20])
|
| 246 |
|
|
`ADD_RR: begin vf <= resv32; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 247 |
|
|
`SUB_RR:
|
| 248 |
|
|
if (Rt==4'h0) // CMP doesn't set overflow
|
| 249 |
|
|
begin cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 250 |
|
|
else
|
| 251 |
|
|
begin vf <= resv32; cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 252 |
|
|
`AND_RR:
|
| 253 |
|
|
if (Rt==4'h0) // BIT sets overflow
|
| 254 |
|
|
begin nf <= b[31]; vf <= b[30]; zf <= resz32; end
|
| 255 |
|
|
else
|
| 256 |
|
|
begin nf <= resn32; zf <= resz32; end
|
| 257 |
|
|
`OR_RR: begin nf <= resn32; zf <= resz32; end
|
| 258 |
|
|
`EOR_RR: begin nf <= resn32; zf <= resz32; end
|
| 259 |
|
|
`MUL_RR: begin nf <= resn32; zf <= resz32; end
|
| 260 |
|
|
`MULS_RR: begin nf <= resn32; zf <= resz32; end
|
| 261 |
|
|
`DIV_RR: begin nf <= resn32; zf <= resz32; end
|
| 262 |
|
|
`DIVS_RR: begin nf <= resn32; zf <= resz32; end
|
| 263 |
|
|
`MOD_RR: begin nf <= resn32; zf <= resz32; end
|
| 264 |
|
|
`MODS_RR: begin nf <= resn32; zf <= resz32; end
|
| 265 |
|
|
`ASL_RRR: begin nf <= resn32; zf <= resz32; end
|
| 266 |
|
|
`LSR_RRR: begin nf <= resn32; zf <= resz32; end
|
| 267 |
|
|
endcase
|
| 268 |
|
|
`LD_RR: begin zf <= resz32; nf <= resn32; end
|
| 269 |
|
|
`DEC_RR,`INC_RR: begin zf <= resz32; nf <= resn32; end
|
| 270 |
|
|
`ASL_RR,`ROL_RR,`LSR_RR,`ROR_RR: begin cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 271 |
|
|
`ADD_IMM8,`ADD_IMM16,`ADD_IMM32,`ADD_ZPX,`ADD_IX,`ADD_IY,`ADD_ABS,`ADD_ABSX,`ADD_RIND:
|
| 272 |
|
|
begin vf <= resv32; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 273 |
|
|
`SUB_IMM8,`SUB_IMM16,`SUB_IMM32,`SUB_ZPX,`SUB_IX,`SUB_IY,`SUB_ABS,`SUB_ABSX,`SUB_RIND:
|
| 274 |
|
|
if (Rt==4'h0) // CMP doesn't set overflow
|
| 275 |
|
|
begin cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 276 |
|
|
else
|
| 277 |
|
|
begin vf <= resv32; cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 278 |
|
|
`AND_IMM8,`AND_IMM16,`AND_IMM32,`AND_ZPX,`AND_IX,`AND_IY,`AND_ABS,`AND_ABSX,`AND_RIND:
|
| 279 |
|
|
if (Rt==4'h0) // BIT sets overflow
|
| 280 |
|
|
begin nf <= b[31]; vf <= b[30]; zf <= resz32; end
|
| 281 |
|
|
else
|
| 282 |
|
|
begin nf <= resn32; zf <= resz32; end
|
| 283 |
|
|
`ORB_ZPX,`ORB_ABS,`ORB_ABSX,
|
| 284 |
|
|
`OR_IMM8,`OR_IMM16,`OR_IMM32,`OR_ZPX,`OR_IX,`OR_IY,`OR_ABS,`OR_ABSX,`OR_RIND,
|
| 285 |
|
|
`EOR_IMM8,`EOR_IMM16,`EOR_IMM32,`EOR_ZPX,`EOR_IX,`EOR_IY,`EOR_ABS,`EOR_ABSX,`EOR_RIND:
|
| 286 |
|
|
begin nf <= resn32; zf <= resz32; end
|
| 287 |
|
|
`ASL_ACC: begin acc <= res; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 288 |
|
|
`ROL_ACC: begin acc <= res; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 289 |
|
|
`LSR_ACC: begin acc <= res; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 290 |
|
|
`ROR_ACC: begin acc <= res; cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 291 |
|
|
`ASL_ZPX,`ASL_ABS,`ASL_ABSX: begin cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 292 |
|
|
`ROL_ZPX,`ROL_ABS,`ROL_ABSX: begin cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 293 |
|
|
`LSR_ZPX,`LSR_ABS,`LSR_ABSX: begin cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 294 |
|
|
`ROR_ZPX,`ROR_ABS,`ROR_ABSX: begin cf <= resc32; nf <= resn32; zf <= resz32; end
|
| 295 |
|
|
`ASL_IMM8: begin nf <= resn32; zf <= resz32; end
|
| 296 |
|
|
`LSR_IMM8: begin nf <= resn32; zf <= resz32; end
|
| 297 |
|
|
`INC_ZPX,`INC_ABS,`INC_ABSX: begin nf <= resn32; zf <= resz32; end
|
| 298 |
|
|
`DEC_ZPX,`DEC_ABS,`DEC_ABSX: begin nf <= resn32; zf <= resz32; end
|
| 299 |
|
|
`PLA: begin acc <= res; zf <= resz32; nf <= resn32; end
|
| 300 |
|
|
`PLX: begin x <= res; zf <= resz32; nf <= resn32; end
|
| 301 |
|
|
`PLY: begin y <= res; zf <= resz32; nf <= resn32; end
|
| 302 |
|
|
`LDX_IMM32,`LDX_IMM16,`LDX_IMM8,`LDX_ZPY,`LDX_ABS,`LDX_ABSY: begin x <= res; nf <= resn32; zf <= resz32; end
|
| 303 |
|
|
`LDY_IMM32,`LDY_ZPX,`LDY_ABS,`LDY_ABSX: begin y <= res; nf <= resn32; zf <= resz32; end
|
| 304 |
|
|
`CPX_IMM32,`CPX_ZPX,`CPX_ABS: begin cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 305 |
|
|
`CPY_IMM32,`CPY_ZPX,`CPY_ABS: begin cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 306 |
|
|
`CMP_IMM8: begin cf <= ~resc32; nf <= resn32; zf <= resz32; end
|
| 307 |
|
|
`LDA_IMM32,`LDA_IMM16,`LDA_IMM8: begin acc <= res; nf <= resn32; zf <= resz32; end
|
| 308 |
|
|
endcase
|
| 309 |
|
|
end
|
| 310 |
|
|
end
|
| 311 |
|
|
end
|
