SynaptiCAD Tutorials

(TD) 1.5 Drawing Signal Waveforms

(TD) 1.5 Drawing Signal Waveforms

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(TD) 1.5 Drawing Signal Waveforms

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Next, we will draw some random waveforms to become familiar with the drawing environment. The timing diagram editor is always in drawing mode so left clicking on a signal will draw a waveform. The red state button controls the type of waveform that is drawn (high, low, tri-state, valid, invalid, weak high, and weak low). The buttons toggle back an forth between two states, and the next state is indicated by the little red T on top.


Draw and watch the State Buttons:

Move the mouse cursor to about 40ns and on the same level as Qoutput. Notice that the cursor has the same shape as the selected State Button.


Left Click to draw a high waveform segment from 0ns to the cursor. Notice that the State Button toggled to low, and the toggle T moved to the High button.


Move the cursor to about 80ns on the same signal. Notice that the cursor looks like a low signal to match the active state button.


Left click to draw a LOW segment. It is drawn from the end of the HIGH signal to the location of the cursor


Draw with other state buttons:

Left click first on the Tri-state button then on the Valid button, so that the Valid button is red and the tri-state button has the red toggle T on it.


Draw some valid and tri-state waveforms, while watching the cursor shape and the state buttons.


Draw more segments, using all the states except the HEX button. The HEX state button is used in defining multi-bit signals and signals which have a user defined VHDL type. This button is covered in later tutorials. For now, experiment with the graphical states.