Finish splitting out functions.
[fpgaboy.git] / insn_rst.v
CommitLineData
df770340
JW
1`ifdef EXECUTE
2 `INSN_RST: begin
3 case (cycle)
4 0: begin
5 `EXEC_INC_PC; // This goes FIRST in RST
6 end
7 1: begin
8 wr <= 1;
9 address <= {registers[`REG_SPH],registers[`REG_SPL]}-1;
10 wdata <= registers[`REG_PCH];
11 end
12 2: begin
13 wr <= 1;
14 address <= {registers[`REG_SPH],registers[`REG_SPL]}-2;
15 wdata <= registers[`REG_PCL];
16 end
17 3: begin
18 `EXEC_NEWCYCLE;
19 {registers[`REG_PCH],registers[`REG_PCL]} <=
20 {10'b0,opcode[5:3],3'b0};
21 end
22 endcase
23 end
24`endif
25
26`ifdef WRITEBACK
27 `INSN_RST: begin
28 case (cycle)
29 0: begin /* type F */ end
30 1: begin /* type F */ end
31 2: begin /* type F */ end
32 3: {registers[`REG_SPH],registers[`REG_SPL]} <=
33 {registers[`REG_SPH],registers[`REG_SPL]}-2;
34 endcase
35 end
36`endif
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