byucc.jhdl.DRC.Rules
Class MultipleDrivers

java.lang.Object
  byucc.jhdl.DRC.DesignRule
      byucc.jhdl.DRC.Rules.MultipleDrivers

All Implemented Interfaces:

DesignRuleConstants

Direct Known Subclasses:

MultipleDriversXC4000

public abstract class MultipleDrivers

extends DesignRule

This is a Design Rule. If there are multiple cells driving one wire, those cells must be instances of a tristate buffer.

Author:

Michael Halcrow

Field Summary

protected WireList

wires Wires to check for multiple drivers.

Fields inherited from class byucc.jhdl.DRC.DesignRule

cellList, checker, checkOk, description, enabled, failureReport, name, oneLineDescription, violatingCells

Fields inherited from interface byucc.jhdl.DRC.DesignRuleConstants

MSGHEADER_ERROR, MSGHEADER_NOTICE, MSGHEADER_STATUS, MSGHEADER_WARNING, MSGTYPE_ERR_ALL, MSGTYPE_ERR_EXPERTWARN, MSGTYPE_ERR_NOEXPERT, MSGTYPE_ERROR_BITS, MSGTYPE_MUTE, MSGTYPE_NOTICE, MSGTYPE_NOTICE_BITS, MSGTYPE_NOTICE_NOEXPERT, MSGTYPE_STATUS, MSGTYPE_STATUS_BITS, MSGTYPE_STATUS_NOEXPERT, MSGTYPE_WARN_ALL, MSGTYPE_WARN_NOEXPERT, MSGTYPE_WARNING_BITS, SHOW_NUM_RULES_CHECKED_EVERY

Constructor Summary

MultipleDrivers()
Contructor.

Method Summary

boolean	doCheck() Checks all source cells of all wires.
protected abstract boolean	isTriStateBuffer(Cell cell) Must be implemented for each architecture.
void	sortCell(Cell cell) Grabs all the input wires for all the cells.

Methods inherited from class byucc.jhdl.DRC.DesignRule

addToCellList, addToCellList, addViolatingCell, checkOk, displayMsgHeader, getDescription, getDesignRuleChecker, getName, getOneLineDescription, getReport, getViolatingCells, msg, msg, msg, msg, msgln, msgln, registerViolation, resetState, setCurrentMsgType, setDesignRuleCheckerReference, setName, setReport, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

wires

protected WireList wires

Wires to check for multiple drivers.

Constructor Detail

MultipleDrivers

public MultipleDrivers()

Contructor.

Method Detail

doCheck

public boolean doCheck()

Checks all source cells of all wires. If there are multiple source cells and if at least one of those cells is not a tri-state buffer, then this rule fails.

Specified by:

doCheck in class DesignRule

Returns:

true if the design rule checked is kept, otherwise false.

isTriStateBuffer

protected abstract boolean isTriStateBuffer(Cell cell)

Must be implemented for each architecture.

sortCell

public void sortCell(Cell cell)

Grabs all the input wires for all the cells.

Specified by:

sortCell in class DesignRule

Parameters:

cell - The Cell from which this rule extracts the input wires.