/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.memory;
import java.awt.Color;
import java.awt.Graphics;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Direction;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.Instance;
import com.cburch.logisim.instance.InstanceFactory;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.instance.Port;
import com.cburch.logisim.instance.StdAttr;
import com.cburch.logisim.tools.key.BitWidthConfigurator;
import com.cburch.logisim.util.GraphicsUtil;
import com.cburch.logisim.util.StringUtil;
public class Register extends InstanceFactory {
private static final int DELAY = 8;
private static final int OUT = 0;
private static final int IN = 1;
private static final int CK = 2;
private static final int CLR = 3;
private static final int EN = 4;
public Register() {
super("Register", Strings.getter("registerComponent"));
setAttributes(new Attribute[] {
StdAttr.WIDTH, StdAttr.TRIGGER,
StdAttr.LABEL, StdAttr.LABEL_FONT
}, new Object[] {
BitWidth.create(8), StdAttr.TRIG_RISING,
"", StdAttr.DEFAULT_LABEL_FONT
});
setKeyConfigurator(new BitWidthConfigurator(StdAttr.WIDTH));
setOffsetBounds(Bounds.create(-30, -20, 30, 40));
setIconName("register.gif");
setInstancePoker(RegisterPoker.class);
setInstanceLogger(RegisterLogger.class);
Port[] ps = new Port[5];
ps[OUT] = new Port( 0, 0, Port.OUTPUT, StdAttr.WIDTH);
ps[IN] = new Port(-30, 0, Port.INPUT, StdAttr.WIDTH);
ps[CK] = new Port(-20, 20, Port.INPUT, 1);
ps[CLR] = new Port(-10, 20, Port.INPUT, 1);
ps[EN] = new Port(-30, 10, Port.INPUT, 1);
ps[OUT].setToolTip(Strings.getter("registerQTip"));
ps[IN].setToolTip(Strings.getter("registerDTip"));
ps[CK].setToolTip(Strings.getter("registerClkTip"));
ps[CLR].setToolTip(Strings.getter("registerClrTip"));
ps[EN].setToolTip(Strings.getter("registerEnableTip"));
setPorts(ps);
}
@Override
protected void configureNewInstance(Instance instance) {
Bounds bds = instance.getBounds();
instance.setTextField(StdAttr.LABEL, StdAttr.LABEL_FONT,
bds.getX() + bds.getWidth() / 2, bds.getY() - 3,
GraphicsUtil.H_CENTER, GraphicsUtil.V_BASELINE);
}
@Override
public void propagate(InstanceState state) {
RegisterData data = (RegisterData) state.getData();
if (data == null) {
data = new RegisterData();
state.setData(data);
}
BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
Object triggerType = state.getAttributeValue(StdAttr.TRIGGER);
boolean triggered = data.updateClock(state.getPort(CK), triggerType);
if (state.getPort(CLR) == Value.TRUE) {
data.value = 0;
} else if (triggered && state.getPort(EN) != Value.FALSE) {
Value in = state.getPort(IN);
if (in.isFullyDefined()) data.value = in.toIntValue();
}
state.setPort(OUT, Value.createKnown(dataWidth, data.value), DELAY);
}
@Override
public void paintInstance(InstancePainter painter) {
Graphics g = painter.getGraphics();
Bounds bds = painter.getBounds();
RegisterData state = (RegisterData) painter.getData();
BitWidth widthVal = painter.getAttributeValue(StdAttr.WIDTH);
int width = widthVal == null ? 8 : widthVal.getWidth();
// determine text to draw in label
String a;
String b = null;
if (painter.getShowState()) {
int val = state == null ? 0 : state.value;
String str = StringUtil.toHexString(width, val);
if (str.length() <= 4) {
a = str;
} else {
int split = str.length() - 4;
a = str.substring(0, split);
b = str.substring(split);
}
} else {
a = Strings.get("registerLabel");
b = Strings.get("registerWidthLabel", "" + widthVal.getWidth());
}
// draw boundary, label
painter.drawBounds();
painter.drawLabel();
// draw input and output ports
if (b == null) {
painter.drawPort(IN, "D", Direction.EAST);
painter.drawPort(OUT, "Q", Direction.WEST);
} else {
painter.drawPort(IN);
painter.drawPort(OUT);
}
g.setColor(Color.GRAY);
painter.drawPort(CLR, "0", Direction.SOUTH);
painter.drawPort(EN, Strings.get("memEnableLabel"), Direction.EAST);
g.setColor(Color.BLACK);
painter.drawClock(CK, Direction.NORTH);
// draw contents
if (b == null) {
GraphicsUtil.drawText(g, a, bds.getX() + 15, bds.getY() + 4,
GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
} else {
GraphicsUtil.drawText(g, a, bds.getX() + 15, bds.getY() + 3,
GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
GraphicsUtil.drawText(g, b, bds.getX() + 15, bds.getY() + 15,
GraphicsUtil.H_CENTER, GraphicsUtil.V_TOP);
}
}
}