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//
// Copyright 2021 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Module: rfdc_timing_control
//
// Description:
//
// This module handles timed register writes for the RFDC, such as NCO reset
// control. Timed commands are handled by the ctrlport_timer module.
//
// Parameters:
//
// NUM_DBOARDS : Number of daughter boards to support
//
`default_nettype none
module rfdc_timing_control #(
parameter NUM_DBOARDS = 2
) (
// Clocks and resets
input wire clk,
input wire rst,
// Time
input wire [63:0] time_now,
input wire time_now_stb,
input wire [ 3:0] time_ignore_bits,
// CtrlPort Slave (from RFNoC Radio Block)
input wire [ 1*NUM_DBOARDS-1:0] s_ctrlport_req_wr,
input wire [ 1*NUM_DBOARDS-1:0] s_ctrlport_req_rd,
input wire [ 20*NUM_DBOARDS-1:0] s_ctrlport_req_addr,
input wire [ 32*NUM_DBOARDS-1:0] s_ctrlport_req_data,
input wire [ 4*NUM_DBOARDS-1:0] s_ctrlport_req_byte_en,
input wire [ 1*NUM_DBOARDS-1:0] s_ctrlport_req_has_time,
input wire [ 64*NUM_DBOARDS-1:0] s_ctrlport_req_time,
output wire [ 1*NUM_DBOARDS-1:0] s_ctrlport_resp_ack,
output wire [ 2*NUM_DBOARDS-1:0] s_ctrlport_resp_status,
output wire [ 32*NUM_DBOARDS-1:0] s_ctrlport_resp_data,
// RF Reset Control
output reg start_nco_reset,
input wire nco_reset_done,
output reg adc_reset_pulse,
output reg dac_reset_pulse
);
`include "regmap/rfdc_timing_regmap_utils.vh"
// Reset registers
reg [NUM_DBOARDS-1:0] reg_nco_reset_start = 0;
reg [NUM_DBOARDS-1:0] reg_adc_reset_pulse = 0;
reg [NUM_DBOARDS-1:0] reg_dac_reset_pulse = 0;
genvar db;
generate
for (db = 0; db < NUM_DBOARDS; db = db+1) begin : gen_db_ctrlport
//-----------------------------------------------------------------------
// RF Reset Control
//-----------------------------------------------------------------------
wire [ 1-1:0] nco_ctrlport_req_wr;
wire [ 1-1:0] nco_ctrlport_req_rd;
wire [ 20-1:0] nco_ctrlport_req_addr;
wire [ 32-1:0] nco_ctrlport_req_data;
reg [ 1-1:0] nco_ctrlport_resp_ack;
reg [ 32-1:0] nco_ctrlport_resp_data;
ctrlport_timer #(
.EXEC_LATE_CMDS (1)
) ctrlport_timer_nco (
.clk (clk),
.rst (rst),
.time_now (time_now),
.time_now_stb (time_now_stb),
.time_ignore_bits (time_ignore_bits),
.s_ctrlport_req_wr (s_ctrlport_req_wr [ 1*db+: 1]),
.s_ctrlport_req_rd (s_ctrlport_req_rd [ 1*db+: 1]),
.s_ctrlport_req_addr (s_ctrlport_req_addr [20*db+:20]),
.s_ctrlport_req_data (s_ctrlport_req_data [32*db+:32]),
.s_ctrlport_req_byte_en (s_ctrlport_req_byte_en [ 4*db+: 4]),
.s_ctrlport_req_has_time (s_ctrlport_req_has_time [ 1*db+: 1]),
.s_ctrlport_req_time (s_ctrlport_req_time [64*db+:64]),
.s_ctrlport_resp_ack (s_ctrlport_resp_ack [ 1*db+: 1]),
.s_ctrlport_resp_status (s_ctrlport_resp_status [ 2*db+: 2]),
.s_ctrlport_resp_data (s_ctrlport_resp_data [32*db+:32]),
.m_ctrlport_req_wr (nco_ctrlport_req_wr),
.m_ctrlport_req_rd (nco_ctrlport_req_rd),
.m_ctrlport_req_addr (nco_ctrlport_req_addr),
.m_ctrlport_req_data (nco_ctrlport_req_data),
.m_ctrlport_req_byte_en (),
.m_ctrlport_resp_ack (nco_ctrlport_resp_ack),
.m_ctrlport_resp_status (2'b0),
.m_ctrlport_resp_data (nco_ctrlport_resp_data)
);
always @(posedge clk) begin
if (rst) begin
nco_ctrlport_resp_ack <= 0;
reg_nco_reset_start[db] <= 0;
nco_ctrlport_resp_data <= 'bX;
end else begin
// Default assignments
reg_nco_reset_start[db] <= 0;
reg_adc_reset_pulse[db] <= 0;
reg_dac_reset_pulse[db] <= 0;
nco_ctrlport_resp_ack <= 0;
nco_ctrlport_resp_data <= 0;
// Handle register reads
if (nco_ctrlport_req_rd) begin
case (nco_ctrlport_req_addr)
NCO_RESET_REG: begin
nco_ctrlport_resp_ack <= 1;
nco_ctrlport_resp_data[NCO_RESET_DONE] <= nco_reset_done;
end
GEARBOX_RESET_REG: begin
nco_ctrlport_resp_ack <= 1;
end
endcase
end
// Handle register writes
if (nco_ctrlport_req_wr) begin
case (nco_ctrlport_req_addr)
NCO_RESET_REG: begin
nco_ctrlport_resp_ack <= 1;
reg_nco_reset_start[db] <= nco_ctrlport_req_data[NCO_RESET_START];
end
GEARBOX_RESET_REG: begin
nco_ctrlport_resp_ack <= 1;
reg_adc_reset_pulse[db] <= nco_ctrlport_req_data[ADC_RESET];
reg_dac_reset_pulse[db] <= nco_ctrlport_req_data[DAC_RESET];
end
endcase
end
end
end
end
endgenerate
//---------------------------------------------------------------------------
// Merge Resets
//---------------------------------------------------------------------------
//
// There are multiple DBs but only one reset signal for each RF component.
// Since the reset is simply a single cycle pulse, we OR the reset registers
// for each daughter board together.
//
//---------------------------------------------------------------------------
always @(posedge clk) begin
if (rst) begin
start_nco_reset <= 0;
adc_reset_pulse <= 0;
dac_reset_pulse <= 0;
end else begin
start_nco_reset <= |reg_nco_reset_start;
adc_reset_pulse <= |reg_adc_reset_pulse;
dac_reset_pulse <= |reg_dac_reset_pulse;
end
end
endmodule
`default_nettype wire
//XmlParse xml_on
//
//<regmap name="RFDC_TIMING_REGMAP" readablestrobes="false" generatevhdl="true" ettusguidelines="true">
// <group name="RFDC_TIMING_REGS">
// <register name="NCO_RESET_REG" offset="0x00" size="32" readable="true" writable="true">
// <info>NCO reset control register.</info>
// <bitfield name="NCO_RESET_START" range="0" readable="false" strobe="true">
// <info>Write a 1 to this bit to start a reset the RFDC's NCO.</info>
// </bitfield>
// <bitfield name="NCO_RESET_DONE" range="1" writable="false">
// <info>When 1, indicates that the NCO reset has completed.</info>
// </bitfield>
// </register>
// <register name="GEARBOX_RESET_REG" offset="0x04" size="32" readable="true" writable="true">
// <info>Gearbox reset control register.</info>
// <bitfield name="ADC_RESET" range="0" readable="false" strobe="true">
// <info>
// This reset is for the gearbox on the ADC data path that is used to
// move data from one clock domain to another outside the RFDC. Write
// a 1 to this bit to send a reset pulse to the ADC gearbox.
// </info>
// </bitfield>
// <bitfield name="DAC_RESET" range="1" readable="false" strobe="true">
// <info>
// This reset is for the gearbox on the DAC data path that is used to
// move data from one clock domain to another outside the RFDC. Write
// a 1 to this bit to send a reset pulse to the DAC gearbox.
// </info>
// </bitfield>
// </register>
// </group>
//</regmap>
//
//XmlParse xml_off
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