3.0 Definitions

3.2 Terminology

To avoid confusion, certain keywords have special meanings:

Shall indicates a mandatory requirement. The instruction given has to be followed to conform to the specification. Failure to do so will lead to a non-conforming design which may not work.
Should means that the designer does not need to follow the instruction given and can treat it as a recommendation.
May means that an option is available.
Transfer relates to data crossing the interface between the FEMB and the LSC or the interface between the LDC and the ROMB.
Transmit relates to data travelling along the physical layer between the LSC and the LDC.

These keywords are only used in these contexts.

The S-LINK Interface Specification - 27 MARCH 1997