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Diffstat (limited to 'fpga/usrp2/control_lib/atr_controller.v')
-rw-r--r-- | fpga/usrp2/control_lib/atr_controller.v | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/fpga/usrp2/control_lib/atr_controller.v b/fpga/usrp2/control_lib/atr_controller.v new file mode 100644 index 000000000..fed2791f9 --- /dev/null +++ b/fpga/usrp2/control_lib/atr_controller.v @@ -0,0 +1,57 @@ + +// Automatic transmit/receive switching of control pins to daughterboards +// Store everything in registers for now, but could use a RAM for more +// complex state machines in the future + +module atr_controller + (input clk_i, input rst_i, + input [5:0] adr_i, input [3:0] sel_i, input [31:0] dat_i, output reg [31:0] dat_o, + input we_i, input stb_i, input cyc_i, output reg ack_o, + input run_rx, input run_tx, input [31:0] master_time, + output [31:0] ctrl_lines); + + reg [3:0] state; + reg [31:0] atr_ram [0:15]; // DP distributed RAM + + // WB Interface + always @(posedge clk_i) + if(we_i & stb_i & cyc_i) + begin + if(sel_i[3]) + atr_ram[adr_i[5:2]][31:24] <= dat_i[31:24]; + if(sel_i[2]) + atr_ram[adr_i[5:2]][23:16] <= dat_i[23:16]; + if(sel_i[1]) + atr_ram[adr_i[5:2]][15:8] <= dat_i[15:8]; + if(sel_i[0]) + atr_ram[adr_i[5:2]][7:0] <= dat_i[7:0]; + end // if (we_i & stb_i & cyc_i) + + always @(posedge clk_i) + dat_o <= atr_ram[adr_i[5:2]]; + + always @(posedge clk_i) + ack_o <= stb_i & cyc_i & ~ack_o; + + // Control side of DP RAM + assign ctrl_lines = atr_ram[state]; + + // Put a more complex state machine with time delays and multiple states here + // if daughterboard requires more complex sequencing + localparam ATR_IDLE = 4'd0; + localparam ATR_TX = 4'd1; + localparam ATR_RX = 4'd2; + localparam ATR_FULL_DUPLEX = 4'd3; + + always @(posedge clk_i) + if(rst_i) + state <= ATR_IDLE; + else + case ({run_rx,run_tx}) + 2'b00 : state <= ATR_IDLE; + 2'b01 : state <= ATR_TX; + 2'b10 : state <= ATR_RX; + 2'b11 : state <= ATR_FULL_DUPLEX; + endcase // case({run_rx,run_tx}) + +endmodule // atr_controller |