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Apalis Carrier Board Design Guide
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2.1.2
Type-specific Interfaces
Type-specific interfaces allow for the possibility of including interfaces which may not exist yet or
are yet to be widely adopted, or interfaces which may be specific to a particular device or groups of
devices. They also offer a mechanism for extending features which are present on the standard
interfaces, such as providing additional PCI-Express lanes. This provides the Apalis module with the
flexibility of being able to reconfigure a subset of pins for different uses between different modules.
It should be noted that wherever possible, type-specific interfaces will be kept common across
modules that share such interfaces. For example, if both module A and module B have three
additional PCI-Express lanes which are available in the same configurations as a type-specific
interface, then they shall be assigned to the same pins in the type-specific area of the connector.
Hence, both module A and module B shall share compatibility between these parts of the type-
specific interface.
The signal routing and need for external components for the type-specific interfaces are not
reflected in this document. Please consult the applicable Apalis module datasheet for more
information on these interfaces.
2.1.3
Pin Numbering
The diagrams below show the pin numbering schema on both sides of the module. The schema
deviates from the unrelated MXM3 standard pin numbering schema.
Pins on the top side of the module have even numbering and pins on the bottom side have odd
numbering.
The pin number increases linearly as a multiple of the pitch – that is, pins which are not assembled
in the connector (between pins 18 and 23) are also accounted for in the numbering (pins 19
through 22 do not exist). Similarly, pins which do not exist due to the connector notch are also
accounted for (pins 166 through 172).
Figure 2: Pin numbering schema on the top side of the module
0.50
1.25
1.25
1.50
Pin2
Pin4
Pin18
Pin24
Pin164
Pin174
Pin320
Top Side