NanDigits Design Automation

Go back to GofTrace Top

Trace Fanin/Fanout

• The basic function of GofTrace is to trace gate's fanin fanout.
• The Fanin of a cell is all the other cells that drive the cell.
• The Fanout of a cell is the other cells that the cell drives.
• Click Mouse-Middle-Button on the input pins of the gate U86

• When clicking the button, the driving gate appears under cursor, don't release button.
• Move the gate to anywhere you want. Then release the button.
• After the gate is placed, you can move it any time by clicking Mouse-Left-Button to select it and move it.
• The Fanin of the cell are U110 and U107.

• You can press Mouse-Middle-Button on U86/Y pin to trace the Fanout.
• The n5:4 string tells there is 4 fanouts of U86.
• The Fanout of U86 is U89, U105, U104 and U4, 4 fanouts.

• The basic logic cell has symbol.
• And, Or, Nand, Nor, Inv, Xor, Buf.
• Combining cells like AOI222X4 or OAI2BB1X4 having basic cells above inside have symbols combined.

• Instance, cell name, net, port, connection and comment can be displayed or hided by checking View menu.