BDD: Header2 on an Arduino Mega2560R3

Gallery
Tutorial
TRAIL: A SysMLv1.6+ model of the Arduino Mega2560Rev3 microcontroller board
Section
1: A Webel recipe for modelling microcontrollers in SysML
Topic level
INTERMEDIATE
UML keywords
custom Stereotype
icon
Stereotype:icon
SysML keywords
Block
Keywords
Slide kind
SysML Block Definition Diagram (BDD)

All pins on the 2nd header of the Mega2560 only involve the ATmega2560 mcu chip or the GND and +5V nets:

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Apart from most pins acting as digital I/O pins, the 2nd header also offers access to:
  • 16 pins for the XMEM expansion points to additional external SRAM, split into 8 pins for multiplexed data and low order address, and 8 high order address pins.
  • A T0 timer pin.
  • An XMEM Address Latch Enable (ALE) pin
  • An XMEM inverted read strobe RD pin
  • An XMEM inverted write strobe WD pin
  • 3 additional Pulse Width Modulation (PWM) pins
  • Serial Peripheral Interface (SPI) Pins (MISO, MOSI, SCK, SS)

The pin ports in the header block have corresponding pin shared reference properties split across the 2 row blocks, but we won't be using the row blocks further in this trail.

Separate system-wide instances of type GND and +5V with net values (rather than a mapping to a specific pin), have been assigned as Context-Specific Values for pins of corresponding types.

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BDD: Header3 on an Arduino 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
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IBD: Header2 on an Arduino Mega2560R3 - connections