MC68181 Datasheet, PDF (95/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

Freescale Semiconductor, Inc.
MC68181
Decoder-to-Host Packet Descriptions
SHORT INSTRUCTION VECTOR
Table B-37 Short Instruction Vector Packet Bit Assignments
Byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
3
0
WN₆
WN₅
WN₄
WN₃
WN₂
WN₁
2
e
p₁
p₀
x
x
V₂
V₁
1
x
x
d₁₀
d₉
d₈
d₇
d₆
0
d₄
d₃
d₂
d₁
d₀
i₂
i₁
Bit 0
WN₀
V₀
d₅
i₀
Table B-38 Short Instruction Vector Packet Bit Descriptions
Designator
Description
V
V = 001 for a Short Instruction Vector
WN
This indicates the Word Number of the vector (2–87 decimal) and describes the
location of the vector word in the frame.
e
This bit is set if more than 2 bit errors are detected in the word or, if after error
correction, the check character calculation fails.
p
These bits define the phase on which the vector was found.
(0 = a, 1 = b, 2 = c, 3 = d)
d
These are data bits whose definition depend on the “i” bits in this packet
according to Table B-39. Note that if this vector is received on a long address and
the “e” bit in this packet is not set, the decoder will send a Message Packet
immediately following the Vector Packet. All message bits in the message packet
are unused and should be ignored.
Table B-39 Short Instruction Vector Definition
i₂i₁i₀ d₁₀ d₉ d₈ d₇ d₆ d₅ d₄ d₃ d₂ d₁ d₀
000 a₃ a₂ a₁ a₀ f₆ f₅ f₄ f₃ f₂ f₁ f₀
001
010
011
100
101
Description
Temporary address assignment¹
Reserved
Reserved
Reserved
Reserved
Reserved
MOTOROLA
MC68181 Technical Data Sheet
For More Information On This Product,
Go to: www.freescale.com
B-35