95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
/*
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* Copyright (c) 2016 Martin Whitaker (icarus@martin-whitaker.me.uk)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include "compile.h"
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# include "schedule.h"
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# include "latch.h"
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# include <climits>
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# include <cstdio>
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# include <cassert>
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# include <cstdlib>
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# include <iostream>
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/* We need to ensure an initial output value is propagated. This is
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achieved by scheduling an initial value to be sent to port 3. Any
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value received on port 3 will propagate an initial value of 'bx. */
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vvp_latch::vvp_latch(unsigned width)
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: en_(BIT4_X), d_(width, BIT4_X)
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{
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}
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vvp_latch::~vvp_latch()
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{
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}
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void vvp_latch::recv_vec4(vvp_net_ptr_t port, const vvp_vector4_t&bit,
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vvp_context_t)
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{
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vvp_bit4_t tmp;
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switch (port.port()) {
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case 0: // D
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d_ = bit;
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if (en_ == BIT4_1)
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schedule_propagate_vector(port.ptr(), 0, d_);
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break;
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case 1: // EN
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assert(bit.size() == 1);
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tmp = en_;
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en_ = bit.value(0);
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if (en_ == BIT4_1 && tmp != BIT4_1)
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schedule_propagate_vector(port.ptr(), 0, d_);
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break;
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case 2:
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assert(0);
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break;
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case 3:
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port.ptr()->send_vec4(vvp_vector4_t(d_.size(), BIT4_X), 0);
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break;
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}
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}
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void vvp_latch::recv_vec4_pv(vvp_net_ptr_t ptr, const vvp_vector4_t&bit,
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unsigned base, unsigned vwid, vvp_context_t ctx)
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{
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recv_vec4_pv_(ptr, bit, base, vwid, ctx);
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}
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void compile_latch(char*label, unsigned width,
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struct symb_s arg_d,
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struct symb_s arg_e)
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{
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vvp_net_t*ptr = new vvp_net_t;
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vvp_latch*fun = new vvp_latch(width);
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ptr->fun = fun;
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define_functor_symbol(label, ptr);
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free(label);
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input_connect(ptr, 0, arg_d.text);
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input_connect(ptr, 1, arg_e.text);
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vvp_vector4_t init_val = vvp_vector4_t(1, BIT4_1);
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schedule_init_vector(vvp_net_ptr_t(ptr,3), init_val);
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}
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