Motorola PowerQUICC II MPC8280 Series Reference Manual page 1225

TRL stuff event occurs
and this link is not given
a cell during a round
robin pass.
Depth decreases to 2.x
"Imminent stuff" flagged
Queue insertion pointer
Stuff event is performed
(ICP cell is left in queue
after transmission to be
sent one extra time.)
Depth increases back to 3.x
Figure 34-7. Transmit Queue Behavior: Link Clock Rate Same as TRL
Queue insertion pointer
creeps up such that it
floats between these
two positions (wrapped)
Depth is 4.x
Queue insertion pointer
TRL stuff event happens,
so this link is not given a
cell during round robin.
Depth ratchets down to
normal operation of 3.x
Figure 34-8. Transmit Queue Behavior: Link Clock Rate Slower than TRL
MOTOROLA
Freescale Semiconductor, Inc.
Tx Queue
Tx Queue
Tx Queue
Tx Queue
Chapter 34. Inverse Multiplexing for ATM (IMA)
For More Information On This Product,
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IMA Microcode Architecture
Normal 'Wander zone'
Queue extraction pointer
(Transmitted by non-TRL task)
Normal 'Wander zone'
Queue extraction pointer
(Transmitted by non-TRL task)
Normal 'Wander zone'
Queue extraction pointer
(Transmitted by non-TRL task)
Normal 'Wander zone'
Queue extraction pointer
(Transmitted by non-TRL task)
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