From: Joshua Wise Date: Sat, 29 Mar 2008 07:42:26 +0000 (-0400) Subject: LD reg, imm16 and LD SP,HL X-Git-Url: http://git.joshuawise.com/fpgaboy.git/commitdiff_plain/634ce02ca41547deda6e98f0e16a81f849bb130c?hp=f2e0471561f022000caa932bbe012edde964b6eb LD reg, imm16 and LD SP,HL --- diff --git a/FPGABoy.ise b/FPGABoy.ise index 2aed8f5..5a47155 100644 Binary files a/FPGABoy.ise and b/FPGABoy.ise differ diff --git a/GBZ80Core.v b/GBZ80Core.v index 738bf91..fa9ed0b 100644 --- a/GBZ80Core.v +++ b/GBZ80Core.v @@ -26,6 +26,8 @@ `define INSN_LD_HL_reg 8'b01110xxx `define INSN_LD_reg_HL 8'b01xxx110 `define INSN_LD_reg_reg 8'b01xxxxxx +`define INSN_LD_reg_imm16 8'b00xx0001 +`define INSN_LD_SP_HL 8'b11111001 `define INSN_reg_A 3'b111 `define INSN_reg_B 3'b000 `define INSN_reg_C 3'b001 @@ -34,7 +36,10 @@ `define INSN_reg_H 3'b100 `define INSN_reg_L 3'b101 `define INSN_reg_dHL 3'b110 - +`define INSN_reg16_BC 2'b00 +`define INSN_reg16_DE 2'b01 +`define INSN_reg16_HL 2'b10 +`define INSN_reg16_SP 2'b11 module GBZ80Core( input clk, output reg [15:0] busaddress, /* BUS_* is latched on STATE_FETCH. */ @@ -180,64 +185,129 @@ module GBZ80Core( `INSN_reg_L: begin tmp <= registers[`REG_L]; end endcase end + `INSN_LD_reg_imm16: begin + `EXEC_INC_PC; + case (cycle) + 0: begin + `EXEC_NEXTADDR_PCINC; + rd <= 1; + end + 1: begin + `EXEC_NEXTADDR_PCINC; + rd <= 1; + end + 2: begin `EXEC_NEWCYCLE; end + endcase + end + `INSN_LD_SP_HL: begin + case (cycle) + 0: begin + rd <= 0; + address <= 16'bxxxxxxxxxxxxxxxx; + tmp <= registers[`REG_H]; + end + 1: begin + `EXEC_NEWCYCLE; + `EXEC_INC_PC; + tmp <= registers[`REG_L]; + end + endcase + end + default: + $stop; endcase state <= `STATE_WRITEBACK; end `STATE_WRITEBACK: begin casex (opcode) - `INSN_LD_reg_imm8: - case (cycle) - 0: cycle <= 1; - 1: case (opcode[5:3]) - `INSN_reg_A: begin registers[`REG_A] <= rdata; cycle <= 0; end - `INSN_reg_B: begin registers[`REG_B] <= rdata; cycle <= 0; end - `INSN_reg_C: begin registers[`REG_C] <= rdata; cycle <= 0; end - `INSN_reg_D: begin registers[`REG_D] <= rdata; cycle <= 0; end - `INSN_reg_E: begin registers[`REG_E] <= rdata; cycle <= 0; end - `INSN_reg_H: begin registers[`REG_H] <= rdata; cycle <= 0; end - `INSN_reg_L: begin registers[`REG_L] <= rdata; cycle <= 0; end - `INSN_reg_dHL: cycle <= 2; - endcase - 2: cycle <= 0; - endcase - `INSN_HALT: begin - /* Nothing needs happen here. */ - /* XXX Interrupts needed for HALT. */ - end - `INSN_LD_HL_reg: begin - case (cycle) - 0: cycle <= 1; - 1: cycle <= 0; - endcase - end - `INSN_LD_reg_HL: begin - case (cycle) - 0: cycle <= 1; - 1: begin - case (opcode[5:3]) - `INSN_reg_A: begin registers[`REG_A] <= tmp; end - `INSN_reg_B: begin registers[`REG_B] <= tmp; end - `INSN_reg_C: begin registers[`REG_C] <= tmp; end - `INSN_reg_D: begin registers[`REG_D] <= tmp; end - `INSN_reg_E: begin registers[`REG_E] <= tmp; end - `INSN_reg_H: begin registers[`REG_H] <= tmp; end - `INSN_reg_L: begin registers[`REG_L] <= tmp; end - endcase - cycle <= 0; - end - endcase - end - `INSN_LD_reg_reg: begin - case (opcode[5:3]) - `INSN_reg_A: begin registers[`REG_A] <= tmp; end - `INSN_reg_B: begin registers[`REG_B] <= tmp; end - `INSN_reg_C: begin registers[`REG_C] <= tmp; end - `INSN_reg_D: begin registers[`REG_D] <= tmp; end - `INSN_reg_E: begin registers[`REG_E] <= tmp; end - `INSN_reg_H: begin registers[`REG_H] <= tmp; end - `INSN_reg_L: begin registers[`REG_L] <= tmp; end + `INSN_LD_reg_imm8: + case (cycle) + 0: cycle <= 1; + 1: case (opcode[5:3]) + `INSN_reg_A: begin registers[`REG_A] <= rdata; cycle <= 0; end + `INSN_reg_B: begin registers[`REG_B] <= rdata; cycle <= 0; end + `INSN_reg_C: begin registers[`REG_C] <= rdata; cycle <= 0; end + `INSN_reg_D: begin registers[`REG_D] <= rdata; cycle <= 0; end + `INSN_reg_E: begin registers[`REG_E] <= rdata; cycle <= 0; end + `INSN_reg_H: begin registers[`REG_H] <= rdata; cycle <= 0; end + `INSN_reg_L: begin registers[`REG_L] <= rdata; cycle <= 0; end + `INSN_reg_dHL: cycle <= 2; endcase - end + 2: cycle <= 0; + endcase + `INSN_HALT: begin + /* Nothing needs happen here. */ + /* XXX Interrupts needed for HALT. */ + end + `INSN_LD_HL_reg: begin + case (cycle) + 0: cycle <= 1; + 1: cycle <= 0; + endcase + end + `INSN_LD_reg_HL: begin + case (cycle) + 0: cycle <= 1; + 1: begin + case (opcode[5:3]) + `INSN_reg_A: begin registers[`REG_A] <= tmp; end + `INSN_reg_B: begin registers[`REG_B] <= tmp; end + `INSN_reg_C: begin registers[`REG_C] <= tmp; end + `INSN_reg_D: begin registers[`REG_D] <= tmp; end + `INSN_reg_E: begin registers[`REG_E] <= tmp; end + `INSN_reg_H: begin registers[`REG_H] <= tmp; end + `INSN_reg_L: begin registers[`REG_L] <= tmp; end + endcase + cycle <= 0; + end + endcase + end + `INSN_LD_reg_reg: begin + case (opcode[5:3]) + `INSN_reg_A: begin registers[`REG_A] <= tmp; end + `INSN_reg_B: begin registers[`REG_B] <= tmp; end + `INSN_reg_C: begin registers[`REG_C] <= tmp; end + `INSN_reg_D: begin registers[`REG_D] <= tmp; end + `INSN_reg_E: begin registers[`REG_E] <= tmp; end + `INSN_reg_H: begin registers[`REG_H] <= tmp; end + `INSN_reg_L: begin registers[`REG_L] <= tmp; end + endcase + end + `INSN_LD_reg_imm16: begin + case (cycle) + 0: cycle <= 1; + 1: begin + case (opcode[5:4]) + `INSN_reg16_BC: registers[`REG_C] <= rdata; + `INSN_reg16_DE: registers[`REG_E] <= rdata; + `INSN_reg16_HL: registers[`REG_L] <= rdata; + `INSN_reg16_SP: registers[`REG_SPL] <= rdata; + endcase + cycle <= 2; + end + 2: begin + case (opcode[5:4]) + `INSN_reg16_BC: registers[`REG_B] <= rdata; + `INSN_reg16_DE: registers[`REG_D] <= rdata; + `INSN_reg16_HL: registers[`REG_H] <= rdata; + `INSN_reg16_SP: registers[`REG_SPH] <= rdata; + endcase + cycle <= 0; + end + endcase + end + `INSN_LD_SP_HL: begin + case (cycle) + 0: begin + cycle <= 1; + registers[`REG_SPH] <= tmp; + end + 1: begin + cycle <= 0; + registers[`REG_SPL] <= tmp; + end + endcase + end endcase state <= `STATE_FETCH; end diff --git a/rom.hex b/rom.hex index 2cce52b..a90b962 100644 --- a/rom.hex +++ b/rom.hex @@ -1,9 +1,9 @@ -// LD H, 01h -26 -01 -// LD L, 00h -2E +// LD HL, 0100 +21 00 +01 +// LD SP, HL +F9 // LD B, (HL) 46 // LD A, 12h