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* Since clock lines are required for most designs (every sequential block needs one), most engineers no longer write the world "clock" or even the abbreviation "CLK" on a block diagram. Instead it is understood that a clock line is represented by a small carat or divot on the side of the block (often placed in the top left corner of the block, but that is not a requirement).
* Since clock lines are required for most designs (every sequential block needs one), most engineers no longer write the world "clock" or even the abbreviation "CLK" on a block diagram. Instead it is understood that a clock line is represented by a small carat or divot on the side of the block (often placed in the top left corner of the block, but that is not a requirement).
* Many devices are general purpose, so giving a descriptive label to a pin would be pointless as the description will change depending on the application. A common shorthand for such blocks is to use "D" as the input signal and "Q" as the output signal. This is often seen on registers, multiplexers, flip-flops, etc.
* Many devices are general purpose, so giving a descriptive label to a pin would be pointless as the description will change depending on the application. A common shorthand for such blocks is to use "D" as the input signal and "Q" as the output signal. This is often seen on registers, multiplexers, flip-flops, etc.
* Pens are the devil. Click erasers are a divine blessing. Engineering paper (or just plain old graph paper) is practically a holy artifact. You ''will'' draw this diagram several times (especially as you try to route lines across the paper and realize you left too much space on one side and not enough on the other), so draw it out in pencil then trace over in pen once you're satisfied (for particularly large designs that can be the point where you break your last pencil in half and decide its not worth driving to the store for more).
=== Example: the block diagram ===
=== Example: the block diagram ===
== Enter the code monkey ==
== Enter the code monkey ==
:''Main article: [http://en.wikipedia.org/wiki/Code_monkey code monkey]''
:''See also: [http://en.wikipedia.org/wiki/Code_monkey code monkey]''
Now we lay down some actual code.