80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
#ifndef IVL_PUdp_H
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#define IVL_PUdp_H
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/*
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* Copyright (c) 1998-2021 Stephen Williams (steve@picturel.com)
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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 <map>
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# include <vector>
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# include "LineInfo.h"
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# include "StringHeap.h"
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# include "verinum.h"
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class PExpr;
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/*
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* This class represents a parsed UDP. This is a much simpler object
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* than a module or macromodule.
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*
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* - all ports are scalar,
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* - pin 0 (the first port) is always output,
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* and the remaining pins are input.
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*
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* Thus, the ports can be represented as an ordered list of pin names.
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* If the output port is declared as a register in the Verilog source,
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* then this is a sequential UDP and the sequential flag is set to true.
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*
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* STATE TABLE
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* Each entry in the state table is given as a string with the same
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* number of characters as inputs. If the UDP is sequential, a
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* character is also included at the end of the string to represent
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* the current output.
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*
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* If the UDP is sequential, the "initial" member is taken to be the
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* initial value assigned in the source, or 'x' if none is given.
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*/
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class PUdp : public LineInfo {
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public:
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explicit PUdp(perm_string n, unsigned nports);
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std::vector<std::string> ports;
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unsigned find_port(const char*name);
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bool sequential;
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std::vector<std::string> tinput;
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std::vector<char> tcurrent;
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std::vector<char> toutput;
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verinum::V initial;
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std::map<std::string,PExpr*> attributes;
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void dump(std::ostream&out) const;
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perm_string name_;
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private:
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private: // Not implemented
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PUdp(const PUdp&);
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PUdp& operator= (const PUdp&);
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};
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#endif /* IVL_PUdp_H */
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