Freescale Semiconductor MPC8260 - Manual (Page 980)

ATM Controller and AAL0, AAL1, and AAL5
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
30-60 Freescale Semiconductor
Table 30-27 describes ABR-specific TCTE fields.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Offset + 0x00 ER-TA
Offset + 0x02 CCR-TA
Offset + 0x04 MCR-TA
Offset + 0x06 TUAR — CI-TA NI-TA — CP-TA — CI-VC —
Offset + 0x08 MCR
Offset + 0x0A UNACK
Offset + 0x0C ACR
Offset + 0x0E ACRC —
Offset + 0x10 RM Cell Time Stamp (RCTS)
Offset + 0x12
Offset + 0x14 FRST — CDF COUNT
Offset + 0x16 ICR
Offset + 0x18 CRM
Offset + 0x1A ADTF
Offset + 0x1C ER
Offset + 0x1E ER-BRM
Figure 30-36. ABR Protocol-Specific TCTE
Table 30-27. ABR-Specific TCTE Field Descriptions
Offset Bits Name Description
0x00 — ER-TA Explicit rate–turn-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 field is overwritten by the
new RM cell’s ER.
0x02 — CCR-TA Current cell rate–turn-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 field is overwritten
by the new RM cell’s CCR.
0x04 — MCR-TA Minimum cell rate–turn-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 field is
overwritten by the new RM cell’s MCR.
0x06 0 TUAR Turn-around flag. 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 flow control permits. Should
be cleared initially.
1 — Reserved, should be cleared.
2 CI-TA Congestion indication–turn-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 cell’s CI.