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Serial Interface Specification
Introduction
The Serial Interface Specification (SIF) describes the requirements that two digital systems must meet
to exchange asynchronous serial data. SIF deals only with the physical flow control and asynchronous
serial transmission of data between two digital systems. This specification does not impose any
requirements on how the data is packaged and the number of characters exchanged.
SIF data exchange generates errors under certain conditions but does not specify the actions to take to
correct the error. This is the responsibility of the software/hardware layer above SIF.
Terms and Definitions
Systems
Unless otherwise noted, the systems described in this specification are digital systems.
Inactive
Each system interprets what physical quantity represents inactive. To communicate, two systems must
have the same interpretation of inactive.
The Decoder and the Host
The two systems described in this specification are the decoder and the host. Only one host is allowed
to exist at any time.
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