Motorola PowerQUICC II MPC8280 Series Reference Manual page 1065

31.10.2.2.2 AAL5-ABR Protocol-Specific RCT
Figure 31-27 shows the AAL5-ABR protocol-specific area of an RCT entry.
0
Offset + 0x0E
Offset + 0x10
Offset + 0x12
Offset + 0x14
Offset + 0x16
Offset + 0x18 RDF
Figure 31-27. AAL5-ABR Protocol-Specific RCT
Table 31-18 describes AAL5-ABR protocol-specific RCT fields.
Table 31-18. ABR Protocol-Specific RCT Field Descriptions
Offset Bits Name
0x0E — — AAL5 protocol-specific
0x16 — 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 floating-point
format.
0x18 0–3 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
(RDF=0xF) to 1 (RDF=0).
4–7 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
(RIF=0xF) to 1 (RIF=0).
8–15 — AAL5 protocol-specific
31.10.2.2.3 AAL1 Protocol-Specific RCT
Figure 31-28 shows the AAL1 protocol-specific area of an RCT entry.
0 1
Offset + 0x0E
Offset + 0x10 SRTS_TMP
Offset + 0x12 —
Offset + 0x14
Offset + 0x16
Offset + 0x18 —
MOTOROLA Chapter 31. ATM Controller and AAL0, AAL1, and AAL5
Freescale Semiconductor, Inc.
AAL5 Protocol-Specific
RIF
2 3 4 5 6
—
—
Valid Octet Size (VOS)
SNEM —
Figure 31-28. AAL1 Protocol-Specific RCT
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PCR
AAL5 Protocol-Specific
Description
-RDF
. The decrease factor ranges from 1/32768
-RIF
. The increase factor ranges from 1/32768
7 8 9 10
PFM SRT INVE STF
—
SPV Structured Pointer (SP)
RBDCNT
—
RXBM
ATM Memory Structure
15
11 12 13 14 15
—
SRTS_DEV
SN
—
31-51