Re: timing diagrams
Melissa,
Can you explain what you mean by "timing diagrams?" That's a phrase I haven't ever heard.
Thanks!
Lisa
Lisa,
I'm not Melissa, but let me try to help.
You have a device. The device operates on one or more cycles. (This could be a mechanical device like a washing machine, or it could be an electronic device with no moving parts.)
The device has components. For any given type of cycle (think permanent press vs. regular wash, for example), the cycle has a starting point and a predetermined length. Within that cycle each component does certain actions at certain precise times.
A timing diagram has a horizontal time axis divided into segments of uniform length (could be anything from millennia to attoseconds) and may have vertical lines at some or all of the tick marks, like graph paper without the horizontal lines. The scale is always linear, never logarithmic AFAIK.
Spaced from top to bottom on the timing diagram are horizontal structures, one for each component involved in the cycle. These structures are usually toothed, so that each change in level represents a state change in the component (on/off, clockwise/counterclockwise, high-positive/low-positive/neutral/low-negative/high-negative, whatever the available states are). The diagram generally has leaders and callouts for at least the key points in the cycle if not for everything.
The purpose of the diagram is to specify how things move in relation to each other over the course of the cycle and to inform the construction of the code that effects the required state changes or movements.
Okay?
Dick
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Re: timing diagrams: From: Lisa Wright
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Interesting comment from a process wonk
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