Motorola MPC8260 PowerQUICC II User Manual page 803

Part IV. Communications Processor Module
B-RM/DATA In Rate Cell Tx
Source End-Sys 4
Send RM (DIR = forward, CCR = ACR, ER = PCR, CI = NI = CLP = 0)
Figure 29-12. ABR Transmit Flow (Continued)
29-23
RM/DATA In Rate Cell Tx
Source End-Sys 3
Count >= Nrm
No
or (Count > Mrm
and Now ³
(Last_RM+Trm))
Yes
Time = Now - Last_RM
No
Time >ADTF
ACR = ICR
No
Unack³Crm
ACR = ACR-ACR´CDF
ACR = max(ACR,MCR)
Count=0
Last_RM = Now
First-turn = TRUE
Unack = Unack+1
Count = Count+1
EXIT
MPC8260 PowerQUICC II UserÕs Manual
Count=Number of data cells from last F-RM.
Nrm=Number of data cells between every RM cell
Mrm=Fixed number=2
Trm=Max time between every F-RM Cells.
F-RM In Rate Cell Tx
Checking ÒTime-Out FactorÓ Max time
allowed between RM Cells before a rate
Decrease is required.
Source End-Sys 7
ACR is too high
Idle adjust (Òuse it or loose itÓ)
Yes
Source End-Sys 8
Crm=Max number of F-RM cells without any
B-RM cell allowed before rate decrease
is required.
Unack=Number of F-RM cells sent
without any B-RM cell received.
Yes
First-turn = Flag indicates first turn of RM cell
with priority over data cells.
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