mc68181 Freescale Semiconductor, Inc, mc68181 Datasheet - Page 91

• Manufacturer Part Number: mc68181
• Description: Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
SHORT MESSAGE / TONE ONLY VECTOR
Byte
3
2
1
0
Each is described in the following pages. A detailed description of the FLEX software
protocol requirements is provided in Appendix A.
Four of the vectors (Hex/Binary, Alphanumeric, Secure Message, and Short
Instruction) enable the FLEX chip IC to begin the All Frame mode. This mode is
required to allow for the decoding of temporary addresses and/or fragmented
messages. The host disables the All Frame mode after the proper time by writing to
the decoder via the All Frame Mode Packet (see Building a Fragmented Message
on page C-8). For any Address Packet sent to the host (except tone-only addresses), a
corresponding Vector Packet will always be sent. If more than two bit errors are
detected (via BCH calculations, parity calculations, check character calculations, or
value validation) in the vector word the e bit will be set and the message words will
not be sent.
The Numeric, Hex/Binary, Alphanumeric, and Secure Message Vector Packets have
associated Message Word Packets in the message field. The host must use the n and b
bits of the vector word to calculate what message word locations are associated with
the vector. Both the message word locations and the phase must match.
One of the modes of the Short Instruction Vector is used for assigning temporary
addresses that may be associated with a group call.
Table B-29 Short Message / Tone Only Vector Packet Bit Assignments
•
•
•
•
•
Bit 7
Three types of Numeric Vectors
Hex/Binary Vector
Alphanumeric Vector
Secure Message Vector
Short Instruction Vector
d
0
x
e
5
Freescale Semiconductor, Inc.
For More Information On This Product,
Bit 6
WN
MC68181 Technical Data Sheet
p
d
x
1
4
6
Go to: www.freescale.com
Bit 5
WN
d
p
d
11
0
3
5
Bit 4
WN
d
d
x
10
2
4
Bit 3
WN
d
d
x
9
1
Decoder-to-Host Packet Descriptions
3
Bit 2
WN
V
d
d
8
0
2
2
Bit 1
WN
V
d
t
1
7
1
1
Bit 0
WN
MC68181
V
d
t
0
6
0
0
B-31