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-------------------------------------------------------------------
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--!
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--! PDP-8 Processor
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--!
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--! \brief
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--! UART Interface Type Definitions
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--!
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--! \details
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--! This package contains all the type information that is
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--! required to use and UART-based Serial Interface device.
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--!
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--! The UART-based devices are:
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--! -# KL8E Serial Interface (TTY1 and TTY2)
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--! -# PR8E Serial Line Printer (LPR)
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--! -# PR8E Interface to Serial Paper Tape Reader
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--!
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--! \file
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--! uart_types.vhd
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--!
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--! \author
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--! Rob Doyle - doyle (at) cox (dot) net
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--!
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--------------------------------------------------------------------
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--
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-- Copyright (C) 2009, 2010, 2011, 2012 Rob Doyle
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--
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-- This source file may be used and distributed without
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-- restriction provided that this copyright statement is not
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-- removed from the file and that any derivative work contains
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-- the original copyright notice and the associated disclaimer.
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--
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-- This source file is free software; you can redistribute it
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-- and/or modify it under the terms of the GNU Lesser General
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-- Public License as published by the Free Software Foundation;
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-- version 2.1 of the License.
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--
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-- This source is distributed in the hope that it will be
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-- useful, but WITHOUT ANY WARRANTY; without even the implied
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-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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-- PURPOSE. See the GNU Lesser General Public License for more
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-- details.
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--
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-- You should have received a copy of the GNU Lesser General
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-- Public License along with this source; if not, download it
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-- from http://www.gnu.org/licenses/lgpl.txt
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--
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--------------------------------------------------------------------
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--
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-- Comments are formatted for doxygen
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--
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library ieee;
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use ieee.std_logic_1164.all;
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--
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--! Type definitions required for UARTS
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--
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package uart_types is
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--
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-- Baud Rate Select
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--
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subtype uartBR_t is std_logic_vector(0 to 3); --! Baud Rate Configuration type
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constant uartBR1200 : uartBR_t := "0000"; --! 1200 Baud
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constant uartBR2400 : uartBR_t := "0001"; --! 2400 Baud
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constant uartBR4800 : uartBR_t := "0010"; --! 4800 Baud
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constant uartBR9600 : uartBR_t := "0011"; --! 9600 Baud
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constant uartBR19200 : uartBR_t := "0100"; --! 19200 Baud
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constant uartBR38400 : uartBR_t := "0101"; --! 38400 Baud
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constant uartBR57600 : uartBR_t := "0110"; --! 57600 Baud
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constant uartBR115200 : uartBR_t := "0111"; --! 115200 Baud
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--
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-- Handshaking Select
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--
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subtype uartHS_t is std_logic_vector(0 to 1); --! Handshaking type
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constant uartHSnone : uartHS_t := "00"; --! No handshaking
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constant uartHShw : uartHS_t := "01"; --! Hardware handshaking
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constant uartHSsw : uartHS_t := "10"; --! Software (XON/XOFF) handshaking
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constant uartHSres : uartHS_t := "11"; --! Reserved
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--
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-- ASCII Constants
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--
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subtype ascii_t is std_logic_vector(0 to 7);
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constant xon : ascii_t := x"11"; --! XON (^Q)
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constant xoff : ascii_t := x"13"; --! XON (^S)
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end uart_types;
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