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URL https://opencores.org/ocsvn/amber/amber/trunk

Subversion Repositories amber

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  • This comparison shows the changes necessary to convert path 
    /amber/trunk/hw/vlog/amber25
    from Rev 82 to Rev 83
    ↔ Reverse comparison
  •

Rev 82 → Rev 83

/a25_decode.v
94,6 → 94,7
output reg [2:0] o_reg_write_sel,
output reg o_user_mode_regs_store_nxt,
output reg o_firq_not_user_mode,
output reg o_use_carry_in,
 
output reg o_write_data_wen = 'd0,
output reg o_base_address_wen = 'd0, // save ldm base address register
220,6 → 221,7
reg [2:0] status_bits_sel_nxt;
reg [2:0] reg_write_sel_nxt;
wire firq_not_user_mode_nxt;
reg use_carry_in_nxt;
 
// ALU Function signals
reg alu_swap_sel_nxt;
744,7 → 746,8
// default Mux Select values
barrel_shift_amount_sel_nxt = 'd0; // don't shift the input
barrel_shift_data_sel_nxt = 'd0; // immediate value
barrel_shift_function_nxt = 'd0;
barrel_shift_function_nxt = 'd0;
use_carry_in_nxt = 'd0;
multiply_function_nxt = 'd0;
iaddress_sel_nxt = 'd0;
daddress_sel_nxt = 'd0;
818,6 → 821,7
begin
alu_out_sel_nxt = 4'd1; // Add
alu_cin_sel_nxt = 2'd2; // carry in from status_bits
use_carry_in_nxt = 1'd1;
end
if ( opcode == SUB || opcode == CMP ) // Subtract
836,6 → 840,7
alu_out_sel_nxt = 4'd1; // Add
alu_cin_sel_nxt = 2'd2; // carry in from status_bits
alu_not_sel_nxt = 1'd1; // invert B
use_carry_in_nxt = 1'd1;
end
if ( opcode == RSB ) // Reverse Subtract
844,6 → 849,7
alu_cin_sel_nxt = 2'd1; // cin = 1
alu_not_sel_nxt = 1'd1; // invert B
alu_swap_sel_nxt = 1'd1; // swap A and B
use_carry_in_nxt = 1'd1;
end
if ( opcode == RSC ) // Reverse Subtract with carry
1606,6 → 1612,7
o_barrel_shift_data_sel <= barrel_shift_data_sel_nxt;
o_barrel_shift_function <= barrel_shift_function_nxt;
o_alu_function <= alu_function_nxt;
o_use_carry_in <= use_carry_in_nxt;
o_multiply_function <= multiply_function_nxt;
o_interrupt_vector_sel <= next_interrupt;
o_iaddress_sel <= iaddress_sel_nxt;
/a25_core.v
122,7 → 122,7
wire [2:0] reg_write_sel;
wire user_mode_regs_store_nxt;
wire firq_not_user_mode;
 
wire use_carry_in;
wire write_data_wen;
wire copro_write_data_wen;
wire base_address_wen;
264,6 → 264,7
.o_reg_write_sel ( reg_write_sel ),
.o_user_mode_regs_store_nxt ( user_mode_regs_store_nxt ),
.o_firq_not_user_mode ( firq_not_user_mode ),
.o_use_carry_in ( use_carry_in ),
.o_write_data_wen ( write_data_wen ),
.o_base_address_wen ( base_address_wen ),
.o_pc_wen ( pc_wen ),
356,7 → 357,8
.i_status_bits_sel ( status_bits_sel ),
.i_reg_write_sel ( reg_write_sel ),
.i_user_mode_regs_store_nxt ( user_mode_regs_store_nxt ),
.i_firq_not_user_mode ( firq_not_user_mode ),
.i_firq_not_user_mode ( firq_not_user_mode ),
.i_use_carry_in ( use_carry_in ),
.i_write_data_wen ( write_data_wen ),
.i_base_address_wen ( base_address_wen ),
.i_pc_wen ( pc_wen ),
/a25_execute.v
106,9 → 106,9
input [1:0] i_byte_enable_sel,
input [2:0] i_status_bits_sel,
input [2:0] i_reg_write_sel,
// input i_user_mode_regs_load,
input i_user_mode_regs_store_nxt,
input i_firq_not_user_mode,
input i_use_carry_in, // e.g. add with carry instruction
 
input i_write_data_wen,
input i_base_address_wen, // save LDM base address register,
214,6 → 214,9
wire ldm_flags;
wire ldm_status_bits;
 
wire carry_in;
 
 
// ========================================================
// Status Bits in PC register
// ========================================================
558,10 → 561,12
// ========================================================
// Instantiate Barrel Shift
// ========================================================
assign carry_in = i_use_carry_in ? status_bits_flags[1] : 1'd0;
 
a25_barrel_shift u_barrel_shift (
.i_clk ( i_clk ),
.i_in ( barrel_shift_in ),
.i_carry_in ( status_bits_flags[1] ),
.i_carry_in ( carry_in ),
.i_shift_amount ( shift_amount ),
.i_shift_imm_zero ( i_shift_imm_zero ),
.i_function ( i_barrel_shift_function ),

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