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/////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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// Filename: rxuart.v
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// Filename: rxuart.v
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//
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//
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// Project: FPGA library development (Spartan 3E development board)
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// Project: XuLA2 board
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//
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//
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// Purpose: Receive and decode inputs from a single UART line.
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// Purpose: Receive and decode inputs from a single UART line.
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//
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//
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//
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// To interface with this module, connect it to your system clock,
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// To interface with this module, connect it to your system clock,
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// pass it the 32 bit setup register (defined below) and the UART
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// pass it the 32 bit setup register (defined below) and the UART
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// input. When data becomes available, the o_wr line will be asserted
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// input. When data becomes available, the o_wr line will be asserted
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// for one clock cycle. On parity or frame errors, the o_parity_err
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// for one clock cycle. On parity or frame errors, the o_parity_err
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// or o_frame_err lines will be asserted. Likewise, on a break
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// or o_frame_err lines will be asserted. Likewise, on a break
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// would want to set the setup value to:
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// would want to set the setup value to:
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//
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//
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// 32'h0006c8 // For 115,200 baud, 8 bit, no parity
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// 32'h0006c8 // For 115,200 baud, 8 bit, no parity
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// 32'h005161 // For 9600 baud, 8 bit, no parity
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// 32'h005161 // For 9600 baud, 8 bit, no parity
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//
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//
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// Creator: Dan Gisselquist
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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//
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//
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// Copyright: 2015
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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/////////////////////////////////////////////////////////////////////////
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//
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//
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// This software is the ownership of Gisselquist Technology, LLC, and as
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////////////////////////////////////////////////////////////////////////////////
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// such it is proprietary. It is provided without any warrantees, either
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// express or implied, so that it may be tested. Upon completion, I ask
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// that working code be returned and not further distributed beyond those
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// that it is originally offered to.
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//
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//
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// Thank you.
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//
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//
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// States: (@ baud counter == 0)
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// States: (@ baud counter == 0)
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// 0 First bit arrives
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// 0 First bit arrives
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// ..7 Bits arrive
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// ..7 Bits arrive
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