byucc.jhdl.Xilinx.XC4000
Class buffclk

java.lang.Object
  byucc.jhdl.base.Nameable
      byucc.jhdl.base.Node
          byucc.jhdl.base.Cell
              byucc.jhdl.base.CL
                  byucc.jhdl.Xilinx.XC4000.buffclk

All Implemented Interfaces:

BooleanFlags, Buf, PreDefinedSchematic, byucc.jhdl.base.Propagateable, TreeListable, UnmappableCell

public final class buffclk

extends CL

implements UnmappableCell, Buf, PreDefinedSchematic

BUFFCLK (FastCLK buffer) provides the fastest way to bring a clock into the XC4000X device. Four of these buffers are present on those devices - two on the left edge of the die and two on the right edge. Using BUFFCLK, you can create a very fast pin-to-pin path by driving the F input of the CLB function generator with BUFFCLK output. You can use BUFFCLK to minimize the setup time of input devices if positive hold time is acceptable. Use BUFFCLK to clock the Fast Capture latch and a slower clock buffer to capture the standard IOB flip-flop or latch. Either the Global Early buffer (BUFGE) or the Global Low-Skew buffer (BUFGLS) can be used for the second storage element (the one used should be the same clock as the internal related logic). You can also use BUFFCLK to provide a fast Clock-to-Out on device output pins. These buffers can access IOBs on one half of the die edge only. They can each drive two of the four vertical lines accessing the IOBs on the left edge of the device or two of the eight vertical lines accessing the IOBs on the right edge of the device. They can only access the CLB array through single and double-length lines. BUFFCLKs must be driven by the semi-dedicated IOBs. They are not accessible from internal nets. (Source: XACT Libraries Guide, Chapter 3 BUFFCLK, Xilinx Corporation, 1999.)

Field Summary

static CellInterface[]	cell_interface The port interface for: buffclk i : in (1) o : out (1)
static java.lang.String	cellname The static cellname (netlist reference name) for buffclk

Fields inherited from class byucc.jhdl.base.Cell

BOOLEAN, CELL_NAME_DECLARATION, CellInterfaceDeterminesUniqueNetlistStructure, DETERMINE_FROM_STRING, GENERICS_DECLARATION, implicit_interface, IMPLICIT_INTERFACE_DECLARATION, INTEGER, INTERFACE_DECLARATION, LONG, PORT_IOS_DECLARATION, PORT_NAMES_DECLARATION, PORT_NET_NAMES_DECLARATION, PORT_PROPERTIES, PORT_WIDTHS_DECLARATION, SIGN_EXT, STRING, ZERO_PAD

Fields inherited from interface byucc.jhdl.apps.Viewers.Schematic.PreDefinedSchematic

PreDefinedSchematic_ADD, PreDefinedSchematic_ADDSUB, PreDefinedSchematic_AND, PreDefinedSchematic_BUF, PreDefinedSchematic_CONST, PreDefinedSchematic_GEN, PreDefinedSchematic_GND, PreDefinedSchematic_INC, PreDefinedSchematic_INV, PreDefinedSchematic_MUX, PreDefinedSchematic_NAND, PreDefinedSchematic_NOR, PreDefinedSchematic_OR, PreDefinedSchematic_PULLDOWN, PreDefinedSchematic_PULLUP, PreDefinedSchematic_REG, PreDefinedSchematic_SHL, PreDefinedSchematic_SHR, PreDefinedSchematic_TBUF, PreDefinedSchematic_VCC, PreDefinedSchematic_XNOR, PreDefinedSchematic_XOR

Fields inherited from interface byucc.jhdl.base.BooleanFlags

ANTECEDANT_IS_BEHAVIORALLY_MODELED, ASYNC_PORT, ASYNCHRONOUS_RESOLVED, ATOMICALLY_PLACEABLE, ATOMICALLY_UNMAPPABLE, BEHAVIORALLY_MODELED_BRANCH, CLK_PORT, CLOCK_METHOD_IMPLEMENTED_BY_USER, CLOCK_METHOD_IS_DISABLED, CLOCKABLE_IS_SCHEDULED, DANGLING_IS_OK, DELETE_MARK, FATAL_BUILD_ERROR_OCCURED, HAS_BEEN_TRACED, HAS_USER_SPECIFIED_NAME, HWUPDATE, IMPLICIT_PORT, IN_CLK_PORT, IN_PORT, INOUT_PORT, IO_TYPE_FLAGS, IS_BEHAVIORALLY_MODELED, IS_ON_BUILD_STACK, IS_ON_PROP_LIST, IS_PLACED, METHODS_IMPLEMENTED_BY_USER, NETLISTABLE, ORIG_WIRE_IS_ATOMIC, OUT_PORT, PLACEMENT_IS_LOCKED, PROPAGATE_METHOD_IMPLEMENTED_BY_USER, PROPAGATE_METHOD_IS_DISABLED, RECURSION_FLAG, RESET_METHOD_IMPLEMENTED_BY_USER, SIMULATEABLE, SOURCELESS_IS_OK, SYNC_PORT, VISIBLE

Constructor Summary

protected	buffclk(Node parent) Used only by child classes to pass up the parent cell.
	buffclk(Node parent, ArgBlockList abl) Constructs a new buffclk, connecting its ports as given by the String-Wire pairs in the ArgBlockList.
protected	buffclk(Node parent, java.lang.String name) Used only by child classes to pass up the parent cell and instance name.
	buffclk(Node parent, java.lang.String instanceName, ArgBlockList abl) Constructs a new buffclk, connecting its ports as given by the String-Wire pairs in the ArgBlockList.
	buffclk(Node parent, java.lang.String instanceName, java.lang.String s0, Wire w0, java.lang.String s1, Wire w1) Constructs a new buffclk, connecting each Wire to the port whose name is given by the accompanying String parameter The initial String parameter specifies the instance name.
	buffclk(Node parent, java.lang.String s0, Wire w0, java.lang.String s1, Wire w1) Constructs a new buffclk, connecting each Wire to the port whose name is given by the accompanying String parameter
	buffclk(Node parent, java.lang.String instanceName, Wire i, Wire o) Constructs a new buffclk.
	buffclk(Node parent, Wire i, Wire o) Constructs a new buffclk.

Method Summary

boolean	cellInterfaceDeterminesUniqueNetlistStructure() When false, the default behavior of this method, each cell will list itself separately in a netlist, guaranteeing that the netlist will not have invalid data at the expense of a larger file-size.
java.lang.String	getCellName() Access the cell name associated with a derived class.
static void	main(java.lang.String[] argv)
void	propagate() Used for things that are combinationally propagated like combinational logic and Wires and such.
static void	test()
int	type() This method returns one of the predefined schematic constants to identify the type of this cell.

Methods inherited from class byucc.jhdl.base.CL

behavioralModelIsAvailable, defaultSimulationModelIsBehavioral, hasBeenTraced, hasBeenTraced, hasBehaviorInClockMethod, hasBehaviorInPropagateMethod, isAsynchronouslyScheduled, isAsynchronouslyScheduled, isReadyToBeAsynchronouslyScheduled, needsToBeAsynchronouslyScheduled

Methods inherited from class byucc.jhdl.base.Cell

addPort, addPorts, addProperties, addProperties, addProperty, addProperty, addProperty, addProperty, antecedantIsBehaviorallyModeled, antecedantIsBehaviorallyModeled, bind, bind, bind, bind, clk, connect, connectAllWires, connectOptional, constructSubCell, constructSubCellNoImplicitPorts, disableAllBehavioralModels, disableBehavioralModel, enableBehavioralModel, getArgument, getAttachedPort, getAttachedWire, getAttachedWireNoException, getCellNetlist, getCellNetList, getCellNetlist, getCellNetlist, getDescendents, getFlatNetlist, getFlatNetlistableChildren, getGeneric, getHeight, getNetlistableChildren, getPlacementInfo, getPortProperties, getPortRecord, getPortRecords, getProperties, getProperty, getPropertyValue, getSinkWires, getSourceWires, getSubCellClass, getUniqueCellName, getWidth, getX, getY, hasPort, hasPorts, in, in, inout, inout, isAsynchronousSourceSinkResolved, isBehaviorallyModeled, isBehaviorallyModeledBranch, isInput, isLeafCell, isNetlistable, isNetlistable, isNetlistablePort, isNetlistLeaf, isNotNetlistable, isNotNetlistablePort, isNotVisible, isOutput, isPlaceable, isPlaceable, isPlaced, isPlaced, isPlacementLocked, isRoot, isSimulateable, isSimulateable, isSink, isSource, isVisible, isVisible, join, lockPlacement, nc, out, out, param, popHierarchy, port, port, port, postorderCheck, preorderCheck, pushHierarchy, pushHierarchy, pushHierarchy, pushHierarchy, pushHierarchyNoImplicitPorts, pushHierarchyNoImplicitPorts, removeAllUnconnectedPorts, removePort, removeProperty, replaceProperty, replaceProperty, resetBehavioralModelsToDefaults, setAsynchronousSourceSinkResolved, setGeneric, setHeight, setNotNetlistable, setNotNetlistable, setNotVisible, setNotVisible, setPlacementInfo, setPortNotNetlistable, setPortNotNetlistable, setProperty, setWidth, subClassDelete, toString, uniquifyCell, userDefinedClockCount, verifyAndCleanup

Methods inherited from class byucc.jhdl.base.Node

addObservable, addSimulatorCallback, checkAll, delete, getBuildingFlag, getChildren, getChildrenEnumeration, getDefaultClock, getInstanceName, getParent, getParentCell, getRelatives, getSystem, getWires, optimize, orphanAllowed, printAllChildren, printTree, removeSimulatorCallback, setDefaultClock

Methods inherited from class byucc.jhdl.base.Nameable

caseSensitivity, caseSensitivity, disableNameClashChecking, getFullName, getFullNameNoTestBench, getHierNameNoTestBench, getInstanceNo, getInstanceNumber, getLeafName, getLeafName, getRelativeName, getUserName, getUserName, hasUserSpecifiedName, isDescendantOf, setInstanceNumber

Methods inherited from class java.lang.Object

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

Field Detail

cellname

public static final java.lang.String cellname

The static cellname (netlist reference name) for buffclk

See Also:

Constant Field Values

cell_interface

public static CellInterface[] cell_interface

The port interface for: buffclk i : in (1) o : out (1)

Constructor Detail

buffclk

protected buffclk(Node parent)

Used only by child classes to pass up the parent cell.

Parameters:

parent - Parent cell

buffclk

protected buffclk(Node parent,
                  java.lang.String name)

Used only by child classes to pass up the parent cell and instance name.

Parameters:

parent - Parent cell

name - Instance name of the cell

buffclk

public buffclk(Node parent,
               Wire i,
               Wire o)

Constructs a new buffclk.

Parameters:

parent - The parent Cell to the buffclk

i - The Wire to be connected to input port i

o - The Wire to be connected to output port o

buffclk

public buffclk(Node parent,
               java.lang.String instanceName,
               Wire i,
               Wire o)

Constructs a new buffclk. The initial String parameter specifies the instance name.

Parameters:

parent - The parent Cell to the buffclk

instanceName - The instance name of the buffclk

i - The Wire to be connected to input port i

o - The Wire to be connected to output port o

buffclk

public buffclk(Node parent,
               java.lang.String s0,
               Wire w0,
               java.lang.String s1,
               Wire w1)

Constructs a new buffclk, connecting each Wire to the port whose name is given by the accompanying String parameter

Parameters:

parent - The parent Cell to the buffclk

s0 - The name of the port to which w0 will be connected

w0 - The Wire to be connected to the port specified by s0

s1 - The name of the port to which w1 will be connected

w1 - The Wire to be connected to the port specified by s1

buffclk

public buffclk(Node parent,
               java.lang.String instanceName,
               java.lang.String s0,
               Wire w0,
               java.lang.String s1,
               Wire w1)

Constructs a new buffclk, connecting each Wire to the port whose name is given by the accompanying String parameter The initial String parameter specifies the instance name.

Parameters:

parent - The parent Cell to the buffclk

instanceName - The instance name of the buffclk

s0 - The name of the port to which w0 will be connected

w0 - The Wire to be connected to the port specified by s0

s1 - The name of the port to which w1 will be connected

w1 - The Wire to be connected to the port specified by s1

buffclk

public buffclk(Node parent,
               ArgBlockList abl)

Constructs a new buffclk, connecting its ports as given by the String-Wire pairs in the ArgBlockList. Any generic assignments are made through String-String pairs in the ArgBlockList.

Parameters:

parent - The parent Cell to the buffclk

abl - The list of String-Wire pairs for port assignments, and String-String pairs for generic assignments.

buffclk

public buffclk(Node parent,
               java.lang.String instanceName,
               ArgBlockList abl)

Constructs a new buffclk, connecting its ports as given by the String-Wire pairs in the ArgBlockList. Any generic assignments are made through String-String pairs in the ArgBlockList. The initial String parameter is the instance name.

Parameters:

parent - The parent Cell to the buffclk

instanceName - The instance name of the buffclk

abl - The list of String-Wire pairs for port assignments, and String-String pairs for generic assignments.

Method Detail

getCellName

public java.lang.String getCellName()

Description copied from class: Cell

Access the cell name associated with a derived class. The cellname field is lazily evaluated on the first call of this method. Can be overriden to make cellname different by instance. If the field does not exist, this defaults to the classname.

Overrides:

getCellName in class Cell

Returns:

the cell name associated with a derived class, null if not declared.

cellInterfaceDeterminesUniqueNetlistStructure

public final boolean cellInterfaceDeterminesUniqueNetlistStructure()

Description copied from class: Cell

When false, the default behavior of this method, each cell will list itself separately in a netlist, guaranteeing that the netlist will not have invalid data at the expense of a larger file-size. Overriding this method to return true allows JHDL to save memory and netlists to be smaller by sharing the netlist structures that are guaranteed to be identical. NOTE: Do not override this unless every possible condition responsible for structural differences in a class (types and amount of children cells created, and arrangements of wires connected to ports) is included in the cellInterface[] of that class.

Overrides:

cellInterfaceDeterminesUniqueNetlistStructure in class Cell

Returns:

false if not overridden, preventing all memory sharing

propagate

public final void propagate()

Description copied from interface: byucc.jhdl.base.Propagateable

Used for things that are combinationally propagated like combinational logic and Wires and such.

Specified by:

propagate in interface byucc.jhdl.base.Propagateable

type

public int type()

Description copied from interface: PreDefinedSchematic

This method returns one of the predefined schematic constants to identify the type of this cell.

Specified by:

type in interface PreDefinedSchematic

Returns:

A predefined schematic constant

main

public static void main(java.lang.String[] argv)

test

public static void test()