IBD: Header3 on an Arduino Mega2560R3 - connections

The many Connectors render this large IBD rather cluttered, the idea here in this trail is merely to show how the underlying information can be captured.

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Modelling and style

Some Connectors in this IBD shows directed ItemFlows on, some have tagged values for 'net', and some have both (most have neither showing). Recall that it was remarked earlier in this trail that great are must be taken using ItemFlows to indicate direction in electrical circuits (here the direction indicates supply voltage provision).

Only «pin» Ports on the ATmega2560 mpu chip that have direct connections to «pin» Ports of :Header3 or related nets are shown. In some cases on the board there are actually intermediate nets that are not shown here.

Note how intermediate «node» block instances are used to represent connection via a common «net».

On the Arduino interactive board viewer schematic (SCH) view the pin p99_GND:GND is indicated as AGND.

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Package overview diagram for Mega2560R3

Notes

[CAPABILITY, FEATURE, TIP, TOOL] In MagicDraw/Cameo an assigned stereotype of a Classifier that types an instance-like element (such as a part Property) "shines through" unless it has an instance-level stereotype assigned. This is sometimes called a "secondary stereotype".

[NAMING, POLICY, STYLE]{STRONG} SysML: Webel: "Trust the Type!" - Often the name of the Type of an anonymous Property or instance-level element is completely sufficient to indicate its role - unless multiple Properties of the same Type have different roles within the same owner context!

[NAMING, POLICY, STYLE] "Trust the Port or Pin Type!" - Often the name of the Type of an anonymous Port or Pin is completely sufficient to indicate its role, unless a clear indication of its direction or unique role is required.

[CAPABILITY, FEATURE, TOOL]{INFORMATIVE} MagicDraw/Cameo supports embedding images in diagrams

Snippets (quotes/extracts)

JTAG (named after the Joint Test Action Group which codified it) is an industry standard for verifying designs and testing printed circuit boards after manufacture.

JTAG: The connector pins are: 1. TDI (Test Data In); 2. TDO (Test Data Out); 3. TCK (Test Clock); 4. TMS (Test Mode Select); 5. TRST (Test Reset) optional.