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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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--! KC8E Front Panel
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--!
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--! \details
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--! This package contatins the interface to the front panel
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--! switches and LEDs.
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--!
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--! \file
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--! kc8e.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) 2010, 2011 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; --! IEEE Library
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use ieee.std_logic_1164.all; --! IEEE 1164
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use work.kc8e_types.all; --! KC8E Types
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use work.cpu_types.all; --! CPU Types
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--
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--! KC8E Front Panel Entity
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--
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entity eKC8E is port (
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sys : in sys_t; --! Clock/Reset
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cpu : in cpu_t; --! CPU Registers
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swROT : in swROT_t; --! Rotary Switch
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swDATA : in data_t; --! Switch Data
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ledRUN : out std_logic; --! RUN LED
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ledADDR : out xaddr_t; --! Address LEDS
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ledDATA : out data_t; --! Data LEDS
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dev : out dev_t --! Device Data
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);
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end eKC8E;
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--
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--! KC8E Front Panel RTL
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--
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architecture rtl of eKC8E is
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begin
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with swROT select
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ledDATA <= cpu.regs.PC when dispPC,
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cpu.regs.AC when dispAC,
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cpu.regs.IR when dispIR,
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cpu.regs.MA when dispMA,
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cpu.regs.MD when dispMD,
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cpu.regs.MQ when dispMQ,
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cpu.regs.ST when dispST,
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cpu.regs.SC when dispSC,
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(others => '0') when others;
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ledADDR <= cpu.regs.XMA & cpu.regs.MA;
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ledRUN <= cpu.run;
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dev <= nullDEV;
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end rtl;
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