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I
B.1.3 Frame Control
The frame control field determines the type of frame. The three types of frames are MAC control,
LLC control, and station management. A MAC control frame looks as follows:
First Bit Transmitted
o
C
C
C
C
I
C
I
C
Most Significant Bit
Where:
c
c
c
c
c
c
0
0
0
0
0
0
claim_token
0
0
0
0
0
1
soliciLsuccessoL 1
0
0
0
0
1
0
soliciLsuccessor_2
0
0
0
0
1
1
who_follows
0
0
0
1
0
0
resolve_contention
0
0
1
0
0
0
token
0
0
1
1
0
0
seLsuccessor
Data frames are represented as follows:
Bits 0
First Bit Transmitted
M
M
M
p
p
p
Most Significant Bit
Where:
Frame Type
E.-f
o
1
LCC Data Frame
1
0
Reserved (Former Systems Management)
1
1
Reserved
MAC Action
M
M
M
0
0
0
Request with No Response
0
0
1
Request with Response
0
1
0
Response
Priority
P
P
P
1
1
1
Highest Priority
(6)
1
1
0
(6)
1
0
1
(4)
1
0
0
(4)
0
1
1
(2)
0
1
0
(2)
0
0
1
(0)
0
0
0 Lowest Priority
(0)
For example, an LCC data frame of priority six would have a frame control field in the TBC frame
descriptor as follows:
.
MOTOROLA
8-2
Bits
Frame Control
MC68824 USER'S MANUAL
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