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[fpgaboy.git] / core / insn_ldm8_a.v
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1`define INSN_LD8M_A 9'b0111x0000 // 1111 for ld A, x; 1110 for ld x, A; bit 1 specifies 16m8 or 8m8
2
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3// If opcode[4], then ld A, x, else ld x, A
4// If opcode[1], then ld 16m8, else ld 8m8
5
6`ifdef EXECUTE
f6fa1d6e 7 `INSN_LD8M_A: begin
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8 case (cycle)
9 0: begin
10 `EXEC_INC_PC
11 `EXEC_READ(`_PC + 16'h0001)
12 end
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13 1: if (opcode[4]) // LD A,x
14 `EXEC_READ(({8'hFF, rdata}))
f9000d73 15 else
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16 `EXEC_WRITE(({8'hFF, rdata}), `_A)
17 2: begin
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18 `EXEC_NEWCYCLE
19 `EXEC_INC_PC
20 end
21 endcase
22 end
23`endif
24
25`ifdef WRITEBACK
f6fa1d6e 26 `INSN_LD8M_A: begin
f9000d73 27 case (cycle)
fe3dc890 28 0: begin end
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29 1: begin end
30 2: if (opcode[4]) `_A <= rdata;
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31 endcase
32 end
33`endif
34
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