/*
* Wrapper for Xilinx MIG'd DDR2 controller, allowing 3 masters
* to contol the single interface.
*/
module xilinx_ddr2
(
// Inputs
input [31:0] wbm0_adr_i,
input [1:0] wbm0_bte_i,
input [2:0] wbm0_cti_i,
input wbm0_cyc_i,
input [31:0] wbm0_dat_i,
input [3:0] wbm0_sel_i,
input wbm0_stb_i,
input wbm0_we_i,
// Outputs
output wbm0_ack_o,
output wbm0_err_o,
output wbm0_rty_o,
output [31:0] wbm0_dat_o,
// Inputs
input [31:0] wbm1_adr_i,
input [1:0] wbm1_bte_i,
input [2:0] wbm1_cti_i,
input wbm1_cyc_i,
input [31:0] wbm1_dat_i,
input [3:0] wbm1_sel_i,
input wbm1_stb_i,
input wbm1_we_i,
// Outputs
output wbm1_ack_o,
output wbm1_err_o,
output wbm1_rty_o,
output [31:0] wbm1_dat_o,
// Inputs
input [31:0] wbm2_adr_i,
input [1:0] wbm2_bte_i,
input [2:0] wbm2_cti_i,
input wbm2_cyc_i,
input [31:0] wbm2_dat_i,
input [3:0] wbm2_sel_i,
input wbm2_stb_i,
input wbm2_we_i,
// Outputs
output wbm2_ack_o,
output wbm2_err_o,
output wbm2_rty_o,
output [31:0] wbm2_dat_o,
input wb_clk,
input wb_rst,
output [12:0] ddr2_a,
output [1:0] ddr2_ba,
output ddr2_ras_n,
output ddr2_cas_n,
output ddr2_we_n,
output [1:0] ddr2_cs_n,
output [1:0] ddr2_odt,
output [1:0] ddr2_cke,
output [7:0] ddr2_dm,
inout [63:0] ddr2_dq,
inout [7:0] ddr2_dqs,
inout [7:0] ddr2_dqs_n,
output [1:0] ddr2_ck,
output [1:0] ddr2_ck_n,
input ddr2_if_clk,
input clk200,
input ddr2_if_rst
);
// Internal wires to actual RAM
wire [31:0] wbs_ram_adr_i;
wire [1:0] wbs_ram_bte_i;
wire [2:0] wbs_ram_cti_i;
wire wbs_ram_cyc_i;
wire [31:0] 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 [31:0] 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)
if (wb_rst)
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)
if (wb_rst)
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 = 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 = 0;
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 = 0;
assign wbm2_rty_o = 0;
xilinx_ddr2_if xilinx_ddr2_if0
(
.wb_dat_o (wbs_ram_dat_o),
.wb_ack_o (wbs_ram_ack_o),
.wb_adr_i (wbs_ram_adr_i[31:0]),
.wb_stb_i (wbs_ram_stb_i),
.wb_cyc_i (wbs_ram_cyc_i),
.wb_we_i (wbs_ram_we_i),
.wb_sel_i (wbs_ram_sel_i[3:0]),
.wb_dat_i (wbs_ram_dat_i[31:0]),
.ddr2_a (ddr2_a[12:0]),
.ddr2_ba (ddr2_ba[1:0]),
.ddr2_ras_n (ddr2_ras_n),
.ddr2_cas_n (ddr2_cas_n),
.ddr2_we_n (ddr2_we_n),
.ddr2_cs_n (ddr2_cs_n),
.ddr2_odt (ddr2_odt),
.ddr2_cke (ddr2_cke),
.ddr2_dm (ddr2_dm[7:0]),
.ddr2_ck (ddr2_ck[1:0]),
.ddr2_ck_n (ddr2_ck_n[1:0]),
.ddr2_dq (ddr2_dq[63:0]),
.ddr2_dqs (ddr2_dqs[7:0]),
.ddr2_dqs_n (ddr2_dqs_n[7:0]),
.ddr2_if_clk (ddr2_if_clk),
.idly_clk_200 (clk200),
.ddr2_if_rst (ddr2_if_rst),
.wb_clk (wb_clk),
.wb_rst (wb_rst));
endmodule
Error running this command: diff -w -U 5 "" "/tmp/QN2m0j"
diff: : No such file or directory