MC68181 Datasheet, PDF (90/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

MC68181
Freescale Semiconductor, Inc.
Decoder-to-Host Packet Descriptions
PHASE (p)
These bits identify the phase on which the address was detected
(0 = a, 1 = b, 2 = c, 3 = d).
LONG ADDRESS TYPE (LA)
This bit is set if the address was programmed in the FLEX chip IC as a long address.
ADDRESS INDEX (AI)
Valid values are 0 through 15 and 128 through 159. The index identifies which of the
addresses was detected. Values 0 through 15 correspond to the sixteen
programmable address words. Values 128 through 143 correspond to the sixteen
temporary addresses. Values 144 through 159 correspond to the 16 operator
messaging addresses. For long addresses, the address detect packet will only be sent
once and the index will refer to the second word of the address.
TONE ONLY ADDRESS (TOA)
This bit is set if the address was programmed in the FLEX chip IC as a tone-only
address. This bit will never be set for temporary or operator messaging addresses. No
vector word will be sent for tone-only addresses.
WORD NUMBER (WN) OF VECTOR (2–87)
These bits describe the location in the frame of the vector word for the detected
address. This value is invalid for this packet if the TOA bit is set.
UNUSED BITS (X)
The value of these bits is not guaranteed.
Vector Packet
The Vector Field follows the Address Field (see Appendix A). Each Vector Packet
must be matched to its corresponding Address Packet. The ID of the vector packet is
the word number where the vector word was received in the frame. This value
corresponds to the WN bits sent in the associated address packet. The phase
information in both the Address Packet and the Vector Packet must also match. It is
important to note for long addresses, the first message word will be transmitted in
the word location immediately following the associated vector (See Message
Building on page C-5). The word number (identified by b₆–b₀) in the Vector Packet
will indicate the message start of the second message word if the message is longer
than 1 word.
There are several types of vectors:
• Short Message/Tone Only Vector
B-30
MC68181 Technical Data Sheet
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