NanDigits Design Automation

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2.2. Trace Fanin/Fanout

• The basic function of GofTrace is to trace cell'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.
• For example, Launch GofTrace, with the cell you need check fanin/out on the schematic.

• The Fanin of the cell includes U110 and U107.
• You can press Mouse-Middle-Button on U86/A and B pins to trace Fanin.
• When click the button, cell appears under cursor, don't release button.
• Move the cell to any where you want. Then release the button.
• After cell is placed to some position, you can move it any time by click Mouse-Left-Button to select it and move it.

• The Fanout of U86 is U89, U105, U104 and U4, 4 fanouts.
• 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 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.

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