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[/] [8051/] [trunk/] [rtl/] [verilog/] [oc8051_decoder.v] - Rev 82
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////////////////////////////////////////////////////////////////////// //// //// //// 8051 core decoder //// //// //// //// This file is part of the 8051 cores project //// //// http://www.opencores.org/cores/8051/ //// //// //// //// Description //// //// Main 8051 core module. decodes instruction and creates //// //// control sigals. //// //// //// //// To Do: //// //// optimize state machine, especially IDS ASS and AS3 //// //// //// //// Author(s): //// //// - Simon Teran, simont@opencores.org //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2000 Authors and OPENCORES.ORG //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 2.1 of the License, or (at your option) any //// //// later version. //// //// //// //// This source is distributed in the hope that it will be //// //// useful, but WITHOUT ANY WARRANTY; without even the implied //// //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// //// PURPOSE. See the GNU Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from http://www.opencores.org/lgpl.shtml //// //// //// ////////////////////////////////////////////////////////////////////// // // CVS Revision History // // $Log: not supported by cvs2svn $ // Revision 1.13 2002/10/23 16:53:39 simont // fix bugs in instruction interface // // Revision 1.12 2002/10/17 18:50:00 simont // cahnge interface to instruction rom // // Revision 1.11 2002/09/30 17:33:59 simont // prepared header // // // synopsys translate_off `include "oc8051_timescale.v" // synopsys translate_on `include "oc8051_defines.v" module oc8051_decoder (clk, rst, op_in, op1_c, ram_rd_sel, ram_wr_sel, bit_addr, wr, wr_sfr, src_sel1, src_sel2, src_sel3, alu_op, psw_set, eq, cy_sel, comp_sel, pc_wr, pc_sel, rd, rmw, istb, mem_act, mem_wait); // // clk (in) clock // rst (in) reset // op_in (in) operation code [oc8051_op_select.op1] // eq (in) compare result [oc8051_comp.eq] // ram_rd_sel (out) select, whitch address will be send to ram for read [oc8051_ram_rd_sel.sel, oc8051_sp.ram_rd_sel] // ram_wr_sel (out) select, whitch address will be send to ram for write [oc8051_ram_wr_sel.sel -r, oc8051_sp.ram_wr_sel -r] // wr (out) write - if 1 then we will write to ram [oc8051_ram_top.wr -r, oc8051_acc.wr -r, oc8051_b_register.wr -r, oc8051_sp.wr-r, oc8051_dptr.wr -r, oc8051_psw.wr -r, oc8051_indi_addr.wr -r, oc8051_ports.wr -r] // src_sel1 (out) select alu source 1 [oc8051_alu_src1_sel.sel -r] // src_sel2 (out) select alu source 2 [oc8051_alu_src2_sel.sel -r] // src_sel3 (out) select alu source 3 [oc8051_alu_src3_sel.sel -r] // alu_op (out) alu operation [oc8051_alu.op_code -r] // psw_set (out) will we remember cy, ac, ov from alu [oc8051_psw.set -r] // cy_sel (out) carry in alu select [oc8051_cy_select.cy_sel -r] // comp_sel (out) compare source select [oc8051_comp.sel] // bit_addr (out) if instruction is bit addresable [oc8051_ram_top.bit_addr -r, oc8051_acc.wr_bit -r, oc8051_b_register.wr_bit-r, oc8051_sp.wr_bit -r, oc8051_dptr.wr_bit -r, oc8051_psw.wr_bit -r, oc8051_indi_addr.wr_bit -r, oc8051_ports.wr_bit -r] // pc_wr (out) pc write [oc8051_pc.wr] // pc_sel (out) pc select [oc8051_pc.pc_wr_sel] // rd (out) read from rom [oc8051_pc.rd, oc8051_op_select.rd] // reti (out) return from interrupt [pin] // rmw (out) read modify write feature [oc8051_ports.rmw] // pc_wait (out) // input clk, rst, eq, mem_wait; input [7:0] op_in; output wr, bit_addr, pc_wr, rmw, istb, src_sel3; output [1:0] psw_set, cy_sel, comp_sel; output [2:0] mem_act, src_sel1, src_sel2, ram_rd_sel, ram_wr_sel, pc_sel, wr_sfr, op1_c; output [3:0] alu_op; output rd; reg rmw; reg src_sel3, wr, bit_addr, pc_wr; reg [1:0] comp_sel, psw_set, cy_sel; reg [3:0] alu_op; reg [2:0] src_sel2, mem_act, src_sel1, ram_wr_sel, ram_rd_sel, pc_sel, wr_sfr; // // state if 2'b00 then normal execution, sle instructin that need more than one clock // op instruction buffer reg [1:0] state; reg [7:0] op; wire [7:0] op_cur; reg stb_i; assign rd = !state[0] && !state[1];// && !stb_o; assign istb = (!state[1]) && stb_i; assign op_cur = (state[0] || state[1] || mem_wait) ? op : op_in; assign op1_c = op_cur[2:0]; // // main block // unregisterd outputs always @(op_cur or eq or state or mem_wait) begin case (state) 2'b01: begin casex (op_cur) `OC8051_MOVC_DP :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOVC_PC :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ACALL :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_AJMP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_LCALL :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DIV : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MUL : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end default begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end endcase end 2'b10: casex (op_cur) `OC8051_RET : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_AL; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RETI : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_AL; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_R : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_I : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_D : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DJNZ_R : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DJNZ_D : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DES; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JB : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JBC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_JC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_CY; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JMP_D : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JNB : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_JNC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_CY; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JNZ : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = !eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_AZ; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JZ : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = eq; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_AZ; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SJMP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_ALU; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DIV : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MUL : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end default begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end endcase 2'b11: casex (op_cur) `OC8051_CJNE_R : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_I : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_D : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DJNZ_R : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DJNZ_D : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RET : begin ram_rd_sel = `OC8051_RRS_SP; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_AH; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_RETI : begin ram_rd_sel = `OC8051_RRS_SP; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_AH; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DIV : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MUL : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end default begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end endcase default: begin casex (op_cur) `OC8051_ACALL :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_I11; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_AJMP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_I11; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_ADD_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ADDC_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_DEC_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DJNZ_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_INC_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_AR : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_DR : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_CR : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_RD : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ORL_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SUBB_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XCH_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_R : begin ram_rd_sel = `OC8051_RRS_RN; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end //op_code [7:1] `OC8051_ADD_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ADDC_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CJNE_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_DEC_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_INC_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_ID : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_AI : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_DI : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_CI : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOVX_IA : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MOVX_AI :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_ORL_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SUBB_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XCH_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XCHD :begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_I : begin ram_rd_sel = `OC8051_RRS_I; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end //op_code [7:0] `OC8051_ADD_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ADD_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ADDC_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ADDC_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_DD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_DC : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ANL_B : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_ANL_NB : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_CJNE_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_CJNE_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_CLR_A : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CLR_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CLR_B : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_CPL_A : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CPL_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_CPL_B : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_DA : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DEC_A : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DEC_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_DIV : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_DJNZ_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_INC_A : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_INC_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_INC_DP : begin ram_rd_sel = `OC8051_RRS_DPTR; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_JB : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b1; end `OC8051_JBC :begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_Y; stb_i = 1'b0; bit_addr = 1'b1; end `OC8051_JC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_CY; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_JMP_D : begin ram_rd_sel = `OC8051_RRS_DPTR; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_JNB : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_BIT; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b1; end `OC8051_JNC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_CY; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_JNZ :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_AZ; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_JZ : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_AZ; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_LCALL :begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_I16; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_LJMP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_Y; pc_sel = `OC8051_PIS_I16; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MOV_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_DA : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_DD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_CD : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOV_BC : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_MOV_CB : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_MOV_DP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_MOVC_DP :begin ram_rd_sel = `OC8051_RRS_DPTR; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MOVC_PC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MOVX_PA : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MOVX_AP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_MUL : begin ram_rd_sel = `OC8051_RRS_B; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_ORL_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ORL_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ORL_AD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ORL_CD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_ORL_B : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_ORL_NB : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_POP : begin ram_rd_sel = `OC8051_RRS_SP; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_PUSH : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RET : begin ram_rd_sel = `OC8051_RRS_SP; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_RETI : begin ram_rd_sel = `OC8051_RRS_SP; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_RL : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RLC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RR : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_RRC : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SETB_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SETB_B : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b1; end `OC8051_SJMP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b0; bit_addr = 1'b0; end `OC8051_SUBB_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SUBB_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_SWAP : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XCH_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_D : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_C : begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_AD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end `OC8051_XRL_CD : begin ram_rd_sel = `OC8051_RRS_D; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_Y; stb_i = 1'b1; bit_addr = 1'b0; end default: begin ram_rd_sel = `OC8051_RRS_DC; pc_wr = `OC8051_PCW_N; pc_sel = `OC8051_PIS_DC; comp_sel = `OC8051_CSS_DC; rmw = `OC8051_RMW_N; stb_i = 1'b1; bit_addr = 1'b0; end endcase end endcase end // // // registerd outputs always @(posedge clk or posedge rst) begin if (rst) begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end else begin case (state) 2'b01: begin casex (op_cur) `OC8051_MOVC_DP :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP1; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DP; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOVC_PC :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP1; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOVX_PA : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP1; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOVX_IA : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP1; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ACALL :begin ram_wr_sel <= #1 `OC8051_RWS_SP; src_sel1 <= #1 `OC8051_AS1_PCH; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_AJMP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_LCALL :begin ram_wr_sel <= #1 `OC8051_RWS_SP; src_sel1 <= #1 `OC8051_AS1_PCH; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DIV : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_DIV; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_BA; end `OC8051_MUL : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_MUL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_BA; end default begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end endcase end 2'b10: casex (op_cur) `OC8051_CJNE_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JBC : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JMP_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNZ : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JZ : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_SJMP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DIV : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_DIV; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MUL : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_MUL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end default begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end endcase 2'b11: casex (op_cur) `OC8051_CJNE_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_RET : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_RETI : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DIV : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_DIV; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MUL : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_MUL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end default begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end endcase default: begin casex (op_cur) `OC8051_ACALL :begin ram_wr_sel <= #1 `OC8051_RWS_SP; src_sel1 <= #1 `OC8051_AS1_PCL; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_AJMP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ADD_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ADDC_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ANL_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_CJNE_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_OP2; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DEC_R : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_R : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_INC_R : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOV_AR : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_DR : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_CR : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_RD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_SUBB_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_XCH_R : begin ram_wr_sel <= #1 `OC8051_RWS_RN; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XCH; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC2; end `OC8051_XRL_R : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end //op_code [7:1] `OC8051_ADD_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ADDC_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ANL_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_CJNE_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_OP2; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DEC_I : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_INC_I : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOV_ID : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_AI : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_DI : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_CI : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOVX_IA : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOVX_AI :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_SUBB_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_XCH_I : begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XCH; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC2; end `OC8051_XCHD :begin ram_wr_sel <= #1 `OC8051_RWS_I; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XCH; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC2; end `OC8051_XRL_I : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end //op_code [7:0] `OC8051_ADD_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ADD_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ADDC_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ADDC_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ANL_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ANL_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ANL_DD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ANL_DC : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ANL_B : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_AND; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ANL_NB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CJNE_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_OP2; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CLR_A : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_CLR_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CLR_B : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CPL_A : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOT; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_CPL_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOT; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_CPL_B : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOT; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_RAM; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DA : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_DA; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_DEC_A : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_DEC_D : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DIV : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_DIV; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_DJNZ_D : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_INC_A : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_INC_D : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_INC_DP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ZERO; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DP; wr_sfr <= #1 `OC8051_WRS_DPTR; end `OC8051_JB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JBC :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JMP_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DP; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JNZ :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_JZ : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_LCALL :begin ram_wr_sel <= #1 `OC8051_RWS_SP; src_sel1 <= #1 `OC8051_AS1_PCL; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_LJMP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOV_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_MOV_DA : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_DD : begin ram_wr_sel <= #1 `OC8051_RWS_D3; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_CD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_BC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_RAM; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_CB : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOV_DP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_OP2; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_DPTR; end `OC8051_MOVC_DP :begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DP; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOVC_PC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_PCL; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_ADD; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOVX_PA : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MOVX_AP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_MUL : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_MUL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_OV; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ORL_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_ORL_AD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_CD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_B : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_OR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_ORL_NB : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_POP : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_PUSH : begin ram_wr_sel <= #1 `OC8051_RWS_SP; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_RET : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_RETI : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_RL : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RL; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_RLC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RLC; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_RR : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_RRC : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RRC; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_SETB_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_CY; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_SETB_B : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_SJMP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_PCL; alu_op <= #1 `OC8051_ALU_PCS; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_PC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_SUBB_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_SUBB_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_OP2; alu_op <= #1 `OC8051_ALU_SUB; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_AC; cy_sel <= #1 `OC8051_CY_PSW; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_SWAP : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_ACC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_RLC; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC2; end `OC8051_XCH_D : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XCH; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_1; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC2; end `OC8051_XRL_D : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_XRL_C : begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_OP2; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_ACC1; end `OC8051_XRL_AD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_RAM; src_sel2 <= #1 `OC8051_AS2_ACC; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end `OC8051_XRL_CD : begin ram_wr_sel <= #1 `OC8051_RWS_D; src_sel1 <= #1 `OC8051_AS1_OP3; src_sel2 <= #1 `OC8051_AS2_RAM; alu_op <= #1 `OC8051_ALU_XOR; wr <= #1 1'b1; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end default: begin ram_wr_sel <= #1 `OC8051_RWS_DC; src_sel1 <= #1 `OC8051_AS1_DC; src_sel2 <= #1 `OC8051_AS2_DC; alu_op <= #1 `OC8051_ALU_NOP; wr <= #1 1'b0; psw_set <= #1 `OC8051_PS_NOT; cy_sel <= #1 `OC8051_CY_0; src_sel3 <= #1 `OC8051_AS3_DC; wr_sfr <= #1 `OC8051_WRS_N; end endcase end endcase end end // // remember current instruction always @(posedge clk or posedge rst) if (rst) op <= #1 2'b00; else if (state==2'b00) op <= #1 op_in; // // in case of instructions that needs more than one clock set state always @(posedge clk or posedge rst) begin if (rst) state <= #1 2'b01; else if (!mem_wait) begin case (state) 2'b10: state <= #1 2'b01; 2'b11: state <= #1 2'b10; 2'b00: casex (op_in) `OC8051_ACALL :state <= #1 2'b01; `OC8051_AJMP : state <= #1 2'b01; `OC8051_CJNE_R :state <= #1 2'b11; `OC8051_CJNE_I :state <= #1 2'b11; `OC8051_CJNE_D : state <= #1 2'b11; `OC8051_CJNE_C : state <= #1 2'b11; `OC8051_LJMP : state <= #1 2'b01; `OC8051_DJNZ_R :state <= #1 2'b11; `OC8051_DJNZ_D :state <= #1 2'b11; `OC8051_LCALL :state <= #1 2'b01; `OC8051_MOVC_DP :state <= #1 2'b11; `OC8051_MOVC_PC :state <= #1 2'b11; `OC8051_MOVX_IA :state <= #1 2'b10; `OC8051_MOVX_AI :state <= #1 2'b10; `OC8051_MOVX_PA :state <= #1 2'b10; `OC8051_MOVX_AP :state <= #1 2'b10; `OC8051_RET : state <= #1 2'b11; `OC8051_RETI : state <= #1 2'b11; `OC8051_SJMP : state <= #1 2'b10; `OC8051_JB : state <= #1 2'b10; `OC8051_JBC : state <= #1 2'b10; `OC8051_JC : state <= #1 2'b10; `OC8051_JMP_D : state <= #1 2'b10; `OC8051_JNC : state <= #1 2'b10; `OC8051_JNB : state <= #1 2'b10; `OC8051_JNZ : state <= #1 2'b10; `OC8051_JZ : state <= #1 2'b10; `OC8051_DIV : state <= #1 2'b11; `OC8051_MUL : state <= #1 2'b11; default: state <= #1 2'b00; endcase default: state <= #1 2'b00; endcase end end // //in case of writing to external ram always @(posedge clk or posedge rst) begin if (rst) begin mem_act <= #1 `OC8051_MAS_NO; end else if (!rd) begin mem_act <= #1 `OC8051_MAS_NO; end else casex (op_cur) `OC8051_MOVX_AI : mem_act <= #1 `OC8051_MAS_RI_W; `OC8051_MOVX_AP : mem_act <= #1 `OC8051_MAS_DPTR_W; `OC8051_MOVX_IA : mem_act <= #1 `OC8051_MAS_RI_R; `OC8051_MOVX_PA : mem_act <= #1 `OC8051_MAS_DPTR_R; `OC8051_MOVC_DP : mem_act <= #1 `OC8051_MAS_CODE; `OC8051_MOVC_PC : mem_act <= #1 `OC8051_MAS_CODE; default : mem_act <= #1 `OC8051_MAS_NO; endcase end endmodule
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