29-58
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
29.10.2.3.6 ABR Protocol-SpeciÞc TCTE
Figure 29-36 shows the ABR protocol-speciÞc TCTE.
Table 29-27 describes ABR-speciÞc TCTE Þelds.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0x00
ER-TA
0x02
CCR-TA
0x04
MCR-TA
0x06
TUAR
Ñ
CI-TA NI-TA
Ñ
CP-TA
Ñ
CI-VC
Ñ
0x08
MCR
0x0A
UNACK
0x0C
ACR
0x0E
ACRC
Ñ
0x10
RM Cell Time Stamp (RCTS)
0x12
0x14
FRST
Ñ
CDF
COUNT
0x16
ICR
0x18
CRM
0x1A
ADTF
0x1C
ER
0x1E
ER-BRM
Figure 29-36. ABR Protocol-Specific TCTE
Table 29-27. ABR-Specific TCTE Field Descriptions
Offset
Bits
Name
Description
0x00
Ñ
ER-TA
Explicit rateÐturn-around cell. Holds the ER of the last received F-RM cell. If another F-RM
cell arrives before the previous F-RM cell was turned around, this Þeld is overwritten by the
new RM cellÕs ER.
0x02
Ñ
CCR-TA Current cell rateÐturn-around cell. Holds the CCR of the last received F-RM cell. If another
F-RM cell arrives before the previous F-RM cell was turned around, this Þeld is overwritten
by the new RM cellÕs CCR.
0x04
Ñ
MCR-TA Minimum cell rateÐturn-around cell. Holds the MCR of the last received F-RM cell. If
another F-RM cell arrives before the previous F-RM cell is turned around, this Þeld is
overwritten by the new RM cellÕs MCR.
0x06
0
TUAR
Turn-around ßag. The CP sets TUAR to indicate that a new F-RM cell was received, which
causes the transmitter to send a B-RM cell whenever the ABR ßow control permits.
Initialize to 0.
1
Ñ
Reserved, should be cleared.
2
CI-TA
Congestion indicationÐturn-around cell. Holds the CI of the last received F-RM cell. If
another F-RM cell arrives before the previous F-RM cell was turned around, CI-TA is
overwritten by the new RM cellÕs CI.
3
NI-TA
No increaseÐturn-around cell. Holds the NI of the last received F-RM cell. If another F-RM
cell arrives before the previous one was turned around, NI-TA is overwritten by the new
RM cellÕs NI.
Содержание MPC8260 PowerQUICC II
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