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//
// Copyright 2015 Ettus Research, A National Instruments Company
// SPDX-License-Identifier: LGPL-3.0
//
// Description: E31X IO for CMOS interface
//
module e310_io (
input areset,
input mimo,
// Baseband sample interface
output radio_clk,
output radio_rst,
output reg [11:0] rx_i0,
output reg [11:0] rx_q0,
output reg [11:0] rx_i1,
output reg [11:0] rx_q1,
output reg rx_stb,
input [11:0] tx_i0,
input [11:0] tx_q0,
input [11:0] tx_i1,
input [11:0] tx_q1,
output reg tx_stb,
// AD9361 interface
input rx_clk,
input rx_frame,
input [11:0] rx_data,
output tx_clk,
output tx_frame,
output [11:0] tx_data
);
// Synchronize asynchronous reset and MIMO
synchronizer #(.STAGES(3), .INITIAL_VAL(1'b1)) sychronizer_radio_rst (
.clk(radio_clk), .rst(areset), .in(1'b0), .out(radio_rst));
wire mimo_sync;
synchronizer synchronizer_mimo (.clk(radio_clk), .rst(radio_rst), .in(mimo), .out(mimo_sync));
/****************************************************************************
** RX Capture Interface
****************************************************************************/
wire rx_clk_bufr; // Capture clock
BUFR bufr_rx_clk (.I(rx_clk), .O(rx_clk_bufr));
BUFG bufg_radio_clk (.I(rx_clk_bufr), .O(radio_clk));
wire [11:0] rx_i, rx_q;
genvar n;
generate
for (n = 0; n < 12; n = n + 1) begin
IDDR #(.DDR_CLK_EDGE("SAME_EDGE")) iddr (
.C(rx_clk_bufr), .CE(1'b1), .R(1'b0), .S(1'b0),
.D(rx_data[n]), .Q1(rx_q[n]), .Q2(rx_i[n]));
end
endgenerate
wire rx_frame_rising, rx_frame_falling;
IDDR #(.DDR_CLK_EDGE("SAME_EDGE")) iddr_frame (
.C(rx_clk_bufr), .CE(1'b1), .R(1'b0), .S(1'b0),
.D(rx_frame), .Q1(rx_frame_rising), .Q2(rx_frame_falling));
always @(posedge radio_clk or posedge radio_rst) begin
if (radio_rst) begin
rx_stb <= 1'b0;
end else begin
if (mimo_sync) begin
if (rx_frame_rising) begin
rx_i0 <= rx_i;
rx_q0 <= rx_q;
end else begin
rx_i1 <= rx_i;
rx_q1 <= rx_q;
end
rx_stb <= ~rx_frame_rising;
end else begin
rx_i0 <= rx_i;
rx_q0 <= rx_q;
rx_i1 <= rx_i;
rx_q1 <= rx_q;
rx_stb <= 1'b1;
end
end
end
/****************************************************************************
** TX Output Interface
****************************************************************************/
reg [11:0] tx_i, tx_q;
reg tx_frame_int = 1'b1;
generate
for (n = 0; n < 12; n = n + 1) begin
ODDR #(.DDR_CLK_EDGE("SAME_EDGE")) oddr (
.C(radio_clk), .CE(1'b1), .R(1'b0), .S(1'b0),
.D1(tx_i[n]), .D2(tx_q[n]), .Q(tx_data[n]));
end
endgenerate
ODDR #(.DDR_CLK_EDGE("SAME_EDGE")) oddr_frame (
.C(radio_clk), .CE(1'b1), .R(1'b0), .S(1'b0),
// In SISO mode, TX frame is asserted only on the falling edge
.D1(tx_frame_int), .D2(tx_frame_int & mimo_sync), .Q(tx_frame));
ODDR #(.DDR_CLK_EDGE("SAME_EDGE")) oddr_clk (
.C(radio_clk), .CE(1'b1), .R(1'b0), .S(1'b0),
.D1(1'b1), .D2(1'b0), .Q(tx_clk));
reg [11:0] tx_i1_hold, tx_q1_hold;
always @(posedge radio_clk or posedge radio_rst) begin
if (radio_rst) begin
tx_stb <= 1'b0;
tx_frame_int <= 1'b1;
end else begin
if (mimo_sync) begin
tx_stb <= ~tx_stb;
tx_frame_int <= tx_stb;
if (tx_stb) begin
tx_i <= tx_i0;
tx_q <= tx_q0;
tx_i1_hold <= tx_i1;
tx_q1_hold <= tx_q1;
end else begin
tx_i <= tx_i1_hold;
tx_q <= tx_q1_hold;
end
end else begin
tx_stb <= 1'b1;
tx_frame_int <= 1'b1;
if ({tx_i0,tx_q0} != 24'd0) begin
tx_i <= tx_i0;
tx_q <= tx_q0;
end else begin
tx_i <= tx_i1;
tx_q <= tx_q1;
end
end
end
end
endmodule
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