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Jianjian Song LogicWorks 4 Tutorials (5/15/03) Page 6 of 14

3 Tutorial #2: Device symbols and sub-circuits

3.1 Objectives

o To make the following turn-signal circuit a sub-circuit.

o To create a device symbol for the turn-signal circuit.

o To draw a turn-signal circuit with the created device symbol and verify it.

o To create a sub-circuit and device symbol with Top-Down approach.

3.2 Example sub-circuit: 74LS08 4 2-input AND gates

Sub-circuit and its symbol

3.3 Draw the schematic of the following turn-signal circuit without clocks

160,160

80,80

40,40

Flash(F)

Left(L)

Left_turn(LT)

Right_turn(RT)

Right(R)

3.4 Create Port Connectors

Port connectors are in part library Connect.clf. A port can be output (Port out), input

(Port in) or bi-directional (Port Bidir). A port has port name and signal name. The port

name is used to match with its external device pins. The port signal name matches signals in the

sub-circuit.

To name a port or its signal, click on the text icon (the button with letter A) in the Tool Palette

and point to the end of the port to type a port name or the wire of the port to type a signal name.

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RAM 4.5 BUX II Series Manual de usuario Pagina 6