Freescale Semiconductor MPC8260 - Manual (Page 1117)

Inverse Multiplexing for ATM (IMA)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 33-15
Figure 33-8. Transmit Queue Behavior: Link Clock Rate Slower than TRL
Queue extraction pointer
Tx Queue
Queue insertion pointer
(Transmitted by non-TRL task)
Normal ‘Wander zone’
floats between these
two positions (wrapped)
Depth is 4.x
creeps up such that it
Queue extraction pointer
Tx Queue
Queue insertion pointer
TRL stuff event happens,
(Transmitted by non-TRL task)
Normal ‘Wander zone’
Depth ratchets down to
so this link is not given a
cell during round robin.
normal operation of 3.x