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//
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//
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// *Author(s):
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// *Author(s):
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// - Olivier Girard, olgirard@gmail.com
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// - Olivier Girard, olgirard@gmail.com
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//
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//
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//----------------------------------------------------------------------------
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//----------------------------------------------------------------------------
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// $Rev: 34 $
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// $Rev: 101 $
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// $LastChangedBy: olivier.girard $
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// $LastChangedBy: olivier.girard $
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// $LastChangedDate: 2009-12-29 20:10:34 +0100 (Tue, 29 Dec 2009) $
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// $LastChangedDate: 2011-03-04 21:17:50 +0100 (Fri, 04 Mar 2011) $
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//----------------------------------------------------------------------------
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//----------------------------------------------------------------------------
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`include "timescale.v"
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`include "timescale.v"
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`include "openMSP430_defines.v"
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`include "openMSP430_defines.v"
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module omsp_alu (
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module omsp_alu (
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wire [15:0] op_src_inv = {16{op_src_inv_cmd}} ^ op_src;
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wire [15:0] op_src_inv = {16{op_src_inv_cmd}} ^ op_src;
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// Mask the bit 8 for the Byte instructions for correct flags generation
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// Mask the bit 8 for the Byte instructions for correct flags generation
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wire op_bit8_msk = ~exec_cycle | ~inst_bw;
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wire op_bit8_msk = ~exec_cycle | ~inst_bw;
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wire [16:0] op_src_in = {1'b0, op_src_inv[15:9], op_src_inv[8] & op_bit8_msk, op_src_inv[7:0]};
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wire [16:0] op_src_in = {1'b0, {op_src_inv[15:8] & {8{op_bit8_msk}}}, op_src_inv[7:0]};
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wire [16:0] op_dst_in = {1'b0, op_dst[15:9], op_dst[8] & op_bit8_msk, op_dst[7:0]};
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wire [16:0] op_dst_in = {1'b0, {op_dst[15:8] & {8{op_bit8_msk}}}, op_dst[7:0]};
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// Clear the source operand (= jump offset) for conditional jumps
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// Clear the source operand (= jump offset) for conditional jumps
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wire jmp_not_taken = (inst_jmp[`JL] & ~(status[3]^status[2])) |
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wire jmp_not_taken = (inst_jmp[`JL] & ~(status[3]^status[2])) |
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(inst_jmp[`JGE] & (status[3]^status[2])) |
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(inst_jmp[`JGE] & (status[3]^status[2])) |
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(inst_jmp[`JN] & ~status[2]) |
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(inst_jmp[`JN] & ~status[2]) |
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