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-- #################################################################################################
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-- #################################################################################################
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-- # << NEORV32 - Arithmetical/Logical Unit >> #
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-- # << NEORV32 - Arithmetical/Logical Unit >> #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # Main data and address ALU and co-processor interface/arbiter. #
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-- # Main data/address ALU and ALU co-processor (= multi-cycle function units). #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # BSD 3-Clause License #
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-- # BSD 3-Clause License #
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-- # #
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-- # #
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-- # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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-- # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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-- # #
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-- # #
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-- RISC-V CPU Extensions --
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-- RISC-V CPU Extensions --
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CPU_EXTENSION_RISCV_B : boolean; -- implement bit-manipulation extension?
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CPU_EXTENSION_RISCV_B : boolean; -- implement bit-manipulation extension?
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CPU_EXTENSION_RISCV_M : boolean; -- implement mul/div extension?
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CPU_EXTENSION_RISCV_M : boolean; -- implement mul/div extension?
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CPU_EXTENSION_RISCV_Zmmul : boolean; -- implement multiply-only M sub-extension?
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CPU_EXTENSION_RISCV_Zmmul : boolean; -- implement multiply-only M sub-extension?
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CPU_EXTENSION_RISCV_Zfinx : boolean; -- implement 32-bit floating-point extension (using INT reg!)
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CPU_EXTENSION_RISCV_Zfinx : boolean; -- implement 32-bit floating-point extension (using INT reg!)
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CPU_EXTENSION_RISCV_Zxcfu : boolean; -- implement custom (instr.) functions unit?
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-- Extension Options --
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-- Extension Options --
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FAST_MUL_EN : boolean; -- use DSPs for M extension's multiplier
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FAST_MUL_EN : boolean; -- use DSPs for M extension's multiplier
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FAST_SHIFT_EN : boolean -- use barrel shifter for shift operations
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FAST_SHIFT_EN : boolean -- use barrel shifter for shift operations
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);
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);
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port (
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port (
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Line 333... |
fpu_flags_o <= (others => '0');
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fpu_flags_o <= (others => '0');
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cp_valid(3) <= '0';
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cp_valid(3) <= '0';
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end generate;
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end generate;
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-- Co-Processor 4: Reserved ---------------------------------------------------------------
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-- Co-Processor 4: Custom (Instructions) Functions Unit ('Zxcfu' Extension) ---------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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neorv32_cpu_cp_cfu_inst_true:
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if (CPU_EXTENSION_RISCV_Zxcfu = true) generate
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neorv32_cpu_cp_cfu_inst: neorv32_cpu_cp_cfu
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port map (
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-- global control --
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clk_i => clk_i, -- global clock, rising edge
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rstn_i => rstn_i, -- global reset, low-active, async
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ctrl_i => ctrl_i, -- main control bus
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start_i => cp_start(4), -- trigger operation
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-- data input --
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rs1_i => rs1_i, -- rf source 1
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rs2_i => rs2_i, -- rf source 2
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-- result and status --
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res_o => cp_result(4), -- operation result
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valid_o => cp_valid(4) -- data output valid
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);
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end generate;
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neorv32_cpu_cp_cfu_inst_false:
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if (CPU_EXTENSION_RISCV_Zxcfu = false) generate
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cp_result(4) <= (others => '0');
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cp_result(4) <= (others => '0');
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cp_valid(4) <= '0';
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cp_valid(4) <= '0';
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end generate;
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-- Co-Processor 5: Reserved ---------------------------------------------------------------
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-- Co-Processor 5: Reserved ---------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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cp_result(5) <= (others => '0');
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cp_result(5) <= (others => '0');
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