1 files changed, 71 insertions, 0 deletions
diff --git a/fpga/usrp1/sdr_lib/adc_interface.v b/fpga/usrp1/sdr_lib/adc_interface.v
new file mode 100644
index 000000000..cb78f332a
--- /dev/null
+++ b/fpga/usrp1/sdr_lib/adc_interface.v
@@ -0,0 +1,71 @@
+
+
+`include "../common/fpga_regs_common.v"
+`include "../common/fpga_regs_standard.v"
+
+module adc_interface
+  (input clock, input reset, input enable,
+   input wire [6:0] serial_addr, input wire [31:0] serial_data, input serial_strobe,
+   input wire [11:0] rx_a_a, input wire [11:0] rx_b_a, input wire [11:0] rx_a_b, input wire [11:0] rx_b_b,
+   output wire [31:0] rssi_0, output wire [31:0] rssi_1, output wire [31:0] rssi_2, output wire [31:0] rssi_3,
+   output reg [15:0] ddc0_in_i, output reg [15:0] ddc0_in_q, 
+   output reg [15:0] ddc1_in_i, output reg [15:0] ddc1_in_q, 
+   output reg [15:0] ddc2_in_i, output reg [15:0] ddc2_in_q, 
+   output reg [15:0] ddc3_in_i, output reg [15:0] ddc3_in_q,
+   output wire [3:0] rx_numchan);
+      
+    // Buffer at input to chip
+   reg [11:0] adc0,adc1,adc2,adc3;
+   always @(posedge clock)
+     begin
+	adc0 <= #1 rx_a_a;
+	adc1 <= #1 rx_b_a;
+	adc2 <= #1 rx_a_b;
+	adc3 <= #1 rx_b_b;
+     end
+   
+   // then scale and subtract dc offset
+   wire [3:0] dco_en;
+   wire [15:0] 	adc0_corr,adc1_corr,adc2_corr,adc3_corr;
+   
+   setting_reg #(`FR_DC_OFFSET_CL_EN) sr_dco_en(.clock(clock),.reset(reset),.strobe(serial_strobe),.addr(serial_addr),.in(serial_data),
+				 .out(dco_en));
+
+   rx_dcoffset #(`FR_ADC_OFFSET_0) rx_dcoffset0(.clock(clock),.enable(dco_en[0]),.reset(reset),.adc_in({adc0[11],adc0,3'b0}),.adc_out(adc0_corr),
+						.serial_addr(serial_addr),.serial_data(serial_data),.serial_strobe(serial_strobe));
+   rx_dcoffset #(`FR_ADC_OFFSET_1) rx_dcoffset1(.clock(clock),.enable(dco_en[1]),.reset(reset),.adc_in({adc1[11],adc1,3'b0}),.adc_out(adc1_corr),
+						.serial_addr(serial_addr),.serial_data(serial_data),.serial_strobe(serial_strobe));
+   rx_dcoffset #(`FR_ADC_OFFSET_2) rx_dcoffset2(.clock(clock),.enable(dco_en[2]),.reset(reset),.adc_in({adc2[11],adc2,3'b0}),.adc_out(adc2_corr),
+						.serial_addr(serial_addr),.serial_data(serial_data),.serial_strobe(serial_strobe));
+   rx_dcoffset #(`FR_ADC_OFFSET_3) rx_dcoffset3(.clock(clock),.enable(dco_en[3]),.reset(reset),.adc_in({adc3[11],adc3,3'b0}),.adc_out(adc3_corr),
+						.serial_addr(serial_addr),.serial_data(serial_data),.serial_strobe(serial_strobe));
+
+   // Level sensing for AGC
+   rssi rssi_block_0 (.clock(clock),.reset(reset),.enable(enable),.adc(adc0),.rssi(rssi_0[15:0]),.over_count(rssi_0[31:16]));
+   rssi rssi_block_1 (.clock(clock),.reset(reset),.enable(enable),.adc(adc1),.rssi(rssi_1[15:0]),.over_count(rssi_1[31:16]));
+   rssi rssi_block_2 (.clock(clock),.reset(reset),.enable(enable),.adc(adc2),.rssi(rssi_2[15:0]),.over_count(rssi_2[31:16]));
+   rssi rssi_block_3 (.clock(clock),.reset(reset),.enable(enable),.adc(adc3),.rssi(rssi_3[15:0]),.over_count(rssi_3[31:16]));
+   
+   // And mux to the appropriate outputs
+   wire [3:0] 	ddc3mux,ddc2mux,ddc1mux,ddc0mux;
+   wire 	rx_realsignals;
+   
+   setting_reg #(`FR_RX_MUX) sr_rxmux(.clock(clock),.reset(reset),.strobe(serial_strobe),.addr(serial_addr),
+				      .in(serial_data),.out({ddc3mux,ddc2mux,ddc1mux,ddc0mux,rx_realsignals,rx_numchan[3:1]}));
+   assign 	rx_numchan[0] = 1'b0;
+   
+   always @(posedge clock)
+     begin
+	ddc0_in_i <= #1 ddc0mux[1] ? (ddc0mux[0] ? adc3_corr : adc2_corr) : (ddc0mux[0] ? adc1_corr : adc0_corr);
+	ddc0_in_q <= #1 rx_realsignals ? 16'd0 : ddc0mux[3] ? (ddc0mux[2] ? adc3_corr : adc2_corr) : (ddc0mux[2] ? adc1_corr : adc0_corr);
+	ddc1_in_i <= #1 ddc1mux[1] ? (ddc1mux[0] ? adc3_corr : adc2_corr) : (ddc1mux[0] ? adc1_corr : adc0_corr);
+	ddc1_in_q <= #1 rx_realsignals ? 16'd0 : ddc1mux[3] ? (ddc1mux[2] ? adc3_corr : adc2_corr) : (ddc1mux[2] ? adc1_corr : adc0_corr);
+	ddc2_in_i <= #1 ddc2mux[1] ? (ddc2mux[0] ? adc3_corr : adc2_corr) : (ddc2mux[0] ? adc1_corr : adc0_corr);
+	ddc2_in_q <= #1 rx_realsignals ? 16'd0 : ddc2mux[3] ? (ddc2mux[2] ? adc3_corr : adc2_corr) : (ddc2mux[2] ? adc1_corr : adc0_corr);
+	ddc3_in_i <= #1 ddc3mux[1] ? (ddc3mux[0] ? adc3_corr : adc2_corr) : (ddc3mux[0] ? adc1_corr : adc0_corr);
+	ddc3_in_q <= #1 rx_realsignals ? 16'd0 : ddc3mux[3] ? (ddc3mux[2] ? adc3_corr : adc2_corr) : (ddc3mux[2] ? adc1_corr : adc0_corr);
+     end
+
+endmodule // adc_interface
+
+