Aal1 Protocol-Specific Rct - Motorola MPC8260 PowerQUICC II User Manual

Part IV. Communications Processor Module
Table 29-18 describes AAL5-ABR protocol-speciÞc RCT Þelds.
Table 29-18. ABR Protocol-Specific RCT Field Descriptions
Offset Bits Name
0x0E Ñ Ñ AAL5 protocol-speciÞc
0x16 Ñ PCR Peak cell rate. The peak number of cells per second of the current ABR channel. The ACR
(allowed cell rate) never exceeds this value. PCR uses the ATMF TM 4.0 ßoating-point format.
0x18 0Ð3 RDF Rate decrease factor for the current ABR channel. Controls the decrease in cell transmission
rate upon receipt of a backward RM cell. RDF represents a negative exponent of two, that is, the
decrease factor = 2
4Ð7 RIF Rate increase factor of the current ABR channel. Controls the increase in the cell transmission
rate upon receipt of a backward RM cell. RIF represents a negative exponent of two, that is, the
increase factor = 2
8Ð15 Ñ AAL5 protocol-speciÞc
29.10.2.2.3 AAL1 Protocol-SpeciÞc RCT
Figure 29-28 shows the AAL1 protocol-speciÞc area of an RCT entry.
0 1
Offset + 0x0E
Offset + 0x10 SRTS_TMP
Offset + 0x12 Ñ
Offset + 0x14
Offset + 0x16
Offset + 0x18
Table 29-19 describes AAL1 protocol-speciÞc RCT Þelds.
29-48
-RDF
. The decrease factor ranges from 1/32768 (RDF=0xF) to 1 (RDF=0).
-RIF
. The increase factor ranges from 1/32768 (RIF=0xF) to 1 (RIF=0).
2 3 4 5
Ñ
Ñ
Valid Octet Size (VOS)
Ñ SNEM
Figure 29-28. AAL1 Protocol-Specific RCT
MPC8260 PowerQUICC II UserÕs Manual
Description
6 7 8 9
PFM SRT INVE STF
Ñ
SPV
RBDCNT
Ñ
Ñ RXBM
10 11 12 13 14
Ñ
SRTS Device
Structured Pointer (SP)
SN
Ñ
MOTOROLA
15