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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [ram_wb/] [ram_wb.v] - Rev 592
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module ram_wb ( // Inputs wbm0_adr_i, wbm0_bte_i, wbm0_cti_i, wbm0_cyc_i, wbm0_dat_i, wbm0_sel_i, wbm0_stb_i, wbm0_we_i, // Outputs wbm0_ack_o, wbm0_err_o, wbm0_rty_o, wbm0_dat_o, // Inputs wbm1_adr_i, wbm1_bte_i, wbm1_cti_i, wbm1_cyc_i, wbm1_dat_i, wbm1_sel_i, wbm1_stb_i, wbm1_we_i, // Outputs wbm1_ack_o, wbm1_err_o, wbm1_rty_o, wbm1_dat_o, // Inputs wbm2_adr_i, wbm2_bte_i, wbm2_cti_i, wbm2_cyc_i, wbm2_dat_i, wbm2_sel_i, wbm2_stb_i, wbm2_we_i, // Outputs wbm2_ack_o, wbm2_err_o, wbm2_rty_o, wbm2_dat_o, // Clock, reset wb_clk_i, wb_rst_i ); // Bus parameters parameter dw = 32; parameter aw = 32; // Memory parameters parameter mem_size_bytes = 32'h0000_0400; // 1KBytes parameter mem_adr_width = 10; //(log2(mem_span)); input [aw-1:0] wbm0_adr_i; input [1:0] wbm0_bte_i; input [2:0] wbm0_cti_i; input wbm0_cyc_i; input [dw-1:0] wbm0_dat_i; input [3:0] wbm0_sel_i; input wbm0_stb_i; input wbm0_we_i; output wbm0_ack_o; output wbm0_err_o; output wbm0_rty_o; output [dw-1:0] wbm0_dat_o; input [aw-1:0] wbm1_adr_i; input [1:0] wbm1_bte_i; input [2:0] wbm1_cti_i; input wbm1_cyc_i; input [dw-1:0] wbm1_dat_i; input [3:0] wbm1_sel_i; input wbm1_stb_i; input wbm1_we_i; output wbm1_ack_o; output wbm1_err_o; output wbm1_rty_o; output [dw-1:0] wbm1_dat_o; input [aw-1:0] wbm2_adr_i; input [1:0] wbm2_bte_i; input [2:0] wbm2_cti_i; input wbm2_cyc_i; input [dw-1:0] wbm2_dat_i; input [3:0] wbm2_sel_i; input wbm2_stb_i; input wbm2_we_i; output wbm2_ack_o; output wbm2_err_o; output wbm2_rty_o; output [dw-1:0] wbm2_dat_o; input wb_clk_i; input wb_rst_i; // Internal wires to actual RAM wire [aw-1:0] wbs_ram_adr_i; wire [1:0] wbs_ram_bte_i; wire [2:0] wbs_ram_cti_i; wire wbs_ram_cyc_i; wire [dw-1:0] wbs_ram_dat_i; wire [3:0] wbs_ram_sel_i; wire wbs_ram_stb_i; wire wbs_ram_we_i; wire wbs_ram_ack_o; wire wbs_ram_err_o; wire wbs_ram_rty_o; wire [dw-1:0] wbs_ram_dat_o; reg [2:0] input_select, last_selected; wire arb_for_wbm0, arb_for_wbm1, arb_for_wbm2; // Wires allowing selection of new input assign arb_for_wbm0 = (last_selected[1] | last_selected[2] | !wbm1_cyc_i | !wbm2_cyc_i) & !(|input_select); assign arb_for_wbm1 = (last_selected[0] | last_selected[2] | !wbm0_cyc_i | !wbm2_cyc_i) & !(|input_select); assign arb_for_wbm2 = (last_selected[0] | last_selected[1] | !wbm0_cyc_i | !wbm1_cyc_i) & !(|input_select); // Master select logic always @(posedge wb_clk_i) if (wb_rst_i) input_select <= 0; else if ((input_select[0] & !wbm0_cyc_i) | (input_select[1] & !wbm1_cyc_i) | (input_select[2] & !wbm2_cyc_i)) input_select <= 0; else if (!(&input_select) & wbm0_cyc_i & arb_for_wbm0) input_select <= 3'b001; else if (!(&input_select) & wbm1_cyc_i & arb_for_wbm1) input_select <= 3'b010; else if (!(&input_select) & wbm2_cyc_i & arb_for_wbm2) input_select <= 3'b100; always @(posedge wb_clk_i) if (wb_rst_i) last_selected <= 0; else if (!(&input_select) & wbm0_cyc_i & arb_for_wbm0) last_selected <= 3'b001; else if (!(&input_select) & wbm1_cyc_i & arb_for_wbm1) last_selected <= 3'b010; else if (!(&input_select) & wbm2_cyc_i & arb_for_wbm2) last_selected <= 3'b100; // Mux input signals to RAM (default to wbm0) assign wbs_ram_adr_i = (input_select[2]) ? wbm2_adr_i : (input_select[1]) ? wbm1_adr_i : (input_select[0]) ? wbm0_adr_i : 0; assign wbs_ram_bte_i = (input_select[2]) ? wbm2_bte_i : (input_select[1]) ? wbm1_bte_i : (input_select[0]) ? wbm0_bte_i : 0; assign wbs_ram_cti_i = (input_select[2]) ? wbm2_cti_i : (input_select[1]) ? wbm1_cti_i : (input_select[0]) ? wbm0_cti_i : 0; assign wbs_ram_cyc_i = (input_select[2]) ? wbm2_cyc_i : (input_select[1]) ? wbm1_cyc_i : (input_select[0]) ? wbm0_cyc_i : 0; assign wbs_ram_dat_i = (input_select[2]) ? wbm2_dat_i : (input_select[1]) ? wbm1_dat_i : (input_select[0]) ? wbm0_dat_i : 0; assign wbs_ram_sel_i = (input_select[2]) ? wbm2_sel_i : (input_select[1]) ? wbm1_sel_i : (input_select[0]) ? wbm0_sel_i : 0; assign wbs_ram_stb_i = (input_select[2]) ? wbm2_stb_i : (input_select[1]) ? wbm1_stb_i : (input_select[0]) ? wbm0_stb_i : 0; assign wbs_ram_we_i = (input_select[2]) ? wbm2_we_i : (input_select[1]) ? wbm1_we_i : (input_select[0]) ? wbm0_we_i : 0; // Output from RAM, gate the ACK, ERR, RTY signals appropriately assign wbm0_dat_o = wbs_ram_dat_o; assign wbm0_ack_o = wbs_ram_ack_o & input_select[0]; assign wbm0_err_o = wbs_ram_err_o & input_select[0]; assign wbm0_rty_o = 0; assign wbm1_dat_o = wbs_ram_dat_o; assign wbm1_ack_o = wbs_ram_ack_o & input_select[1]; assign wbm1_err_o = wbs_ram_err_o & input_select[1]; assign wbm1_rty_o = 0; assign wbm2_dat_o = wbs_ram_dat_o; assign wbm2_ack_o = wbs_ram_ack_o & input_select[2]; assign wbm2_err_o = wbs_ram_err_o & input_select[2]; assign wbm2_rty_o = 0; ram_wb_b3 ram_wb_b3_0 ( // Outputs .wb_ack_o (wbs_ram_ack_o), .wb_err_o (wbs_ram_err_o), .wb_rty_o (wbs_ram_rty_o), .wb_dat_o (wbs_ram_dat_o), // Inputs .wb_adr_i (wbs_ram_adr_i), .wb_bte_i (wbs_ram_bte_i), .wb_cti_i (wbs_ram_cti_i), .wb_cyc_i (wbs_ram_cyc_i), .wb_dat_i (wbs_ram_dat_i), .wb_sel_i (wbs_ram_sel_i), .wb_stb_i (wbs_ram_stb_i), .wb_we_i (wbs_ram_we_i), .wb_clk_i (wb_clk_i), .wb_rst_i (wb_rst_i)); defparam ram_wb_b3_0.aw = aw; defparam ram_wb_b3_0.dw = dw; defparam ram_wb_b3_0.mem_size_bytes = mem_size_bytes; defparam ram_wb_b3_0.mem_adr_width = mem_adr_width; endmodule // ram_wb
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