//`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: LKB
// Engineer: Leonhard Neuhaus
//
// Create Date: 27.11.2014 14:15:43
// Design Name:
// Module Name: red_pitaya_iq_fgen_block
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// This module outputs 4 signed signals:
// sin(f*t), cos(f*t),sin(f*t+phi), cos(f*t+phi)
// The maximally positive signal is 2**(LUTBITS-1)-1
// The maximally negative signal is -(2**(LUTBITS-1)-1)
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
/*
###############################################################################
# pyrpl - DSP servo controller for quantum optics with the RedPitaya
# Copyright (C) 2014-2016 Leonhard Neuhaus (neuhaus@spectro.jussieu.fr)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
###############################################################################
*/
module red_pitaya_iq_fgen_block #(
parameter LUTSZ = 11,
parameter LUTBITS = 17,
parameter PHASEBITS = 32
)
(
input clk_i,
input rstn_i,
input on,
input sin_at_2f,
input cos_at_2f,
input sin_shifted_at_2f,
input cos_shifted_at_2f,
input [PHASEBITS-1:0] start_phase,
input [PHASEBITS-1:0] shift_phase,
output [LUTBITS-1:0] sin_o ,
output [LUTBITS-1:0] cos_o ,
output [LUTBITS-1:0] sin_shifted_o ,
output [LUTBITS-1:0] cos_shifted_o
);
reg [LUTBITS-1:0] sin;
reg [LUTBITS-1:0] cos;
reg [LUTBITS-1:0] sin_shifted;
reg [LUTBITS-1:0] cos_shifted;
assign sin_o = sin;
assign sin_shifted_o = sin_shifted;
assign cos_o = cos;
assign cos_shifted_o = cos_shifted;
localparam QSHIFT = {{PHASEBITS-1{1'b0}},1'b1} << (PHASEBITS-2);
//lut data block
reg [LUTBITS-1-1:0] lutrom [0:(1< timing correct, latency 3 cycles
cos <= invertsignal2_reg_reg ? ((~cos_reg)+'b1) : cos_reg;
sin_shifted <= invertsignal3_reg_reg ? ((~sin_shifted_reg)+'b1) : sin_shifted_reg;
cos_shifted <= invertsignal4_reg_reg ? ((~cos_shifted_reg)+'b1) : cos_shifted_reg;
end
end
//LUT ROM
//created by this (unpolished) python code:
/*
LUTSZ = 11 #number of LUT entries
LUTBITS = 17 #LUT word size
def from_pyint(v,bitlength=14):
v = int(v)
if v < 0:
v = v + 2**bitlength
v= (v & (2**bitlength-1))
return int(v)
data = np.zeros(2**LUTSZ,dtype=np.long)
for i in range(len(data)):
data[i] = np.long(np.round((2**(LUTBITS-1)-1)*np.sin(((float(i)+0.5)/len(data))*0.5*np.pi)))
data = [from_pyint(v,bitlength=LUTBITS) for v in data]
plot(data)
print("reg [LUTBITS-1-1:0] lutrom [0:(1<