MC68181 Datasheet, PDF (46/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
FLEX Message Word Definitions
fragmented transmission until the first fragmented transmission has been
completed.
• For the duration of time that an individual or radio group address is being
used to send a fragmented message, that same address must not appear more
than once in any frame to send an unfragmented message.
• Once a specific dynamic group address (temporary address) is assigned to a
group, it must not be reused until its associated message has been transmitted
in its entirety. Given this constraint, the same dynamic group address can
only appear once in any frame.
• A dynamic group address cannot be used to set up a second dynamic group.
• Messages using any of the three defined numeric vectors (V₂V₁V₀ = 011, 100,
and 111) cannot be fragmented, and thus must be completely contained in a
single frame.
• Fragments of the same message must be sent at a frequency of at least 1 every
32 frames (i.e., at least once a minute) or 1 every 128 frames (i.e., at least once
every 4 minutes) as specified by the service provider.
• Enhanced message fragmenting for symbolic character transmission requires
that the encoder track character boundaries within each fragment in order to
avoid character splitting.
• Message numbering as an optional feature is offered by some carriers and
available on an individual subscriber basis.
• Message numbers must be assigned sequentially in ascending order.
• Message number sequences must be separately maintained for each
individual and radio group address.
• Message numbers are not used (retrieval message number disabled) in
conjunction with a dynamic group address.
• When a missed message is re-transmitted from message retrieval storage, the
message must have R = 0 to avoid creating an out of sequence message that
may cause the pager to indicate a missed message.
FLEX DECODING RULES
• FLEX decoding devices may implement either single-phase addressing or
any-phase addressing.
• FLEX decoding devices that support the numeric vector type (V₂V₁V₀ = 011)
must also support the short message vector (V₂V₁V₀ = 010) with the message
type (t₁t₀) set to 00.
• FLEX decoding devices that support the alphanumeric vector type (V₂V₁V₀ =
101) must support the numeric vector type (V₂V₁V₀ = 011) and the short
message vector (V₂V₁V₀ = 010) with the message type (t₁t₀) set to 00. FLEX
paging devices that implement any-phase and support the alphanumeric
vector type (V₂V₁V₀ = 101) must also support the short instruction vector
(V₂V₁V₀ = 001) with the instruction type (i₂i₁i₀) set to 000.
A-18
MC68181 Technical Data Sheet
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