MPC8280 datasheet(1007/1386 Pages) FREESCALE

1007 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-47

31.10.2.2.2

AAL5-ABR Protocol-Specific RCT

Figure 31-27 shows the AAL5-ABR protocol-specific area of an RCT entry.

Table 31-18 describes AAL5-ABR protocol-specific RCT fields.

31.10.2.2.3

AAL1 Protocol-Specific RCT

Figure 31-28 shows the AAL1 protocol-specific area of an RCT entry.

Offset + 0x0E

AAL5 Protocol-Specific

Offset + 0x10

Offset + 0x12

Offset + 0x14

Offset + 0x16

PCR

Offset + 0x18

RDF

RIF

AAL5 Protocol-Specific

Figure 31-27. AAL5-ABR Protocol-Specific RCT

Table 31-18. ABR Protocol-Specific RCT Field Descriptions

Offset

Bits

Name

Description

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. The decrease factor ranges from

1/32768 (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. The increase factor ranges from 1/32768

(RIF=0xF) to 1 (RIF=0).

8–15

—

AAL5 protocol-specific

Offset + 0x0E

—

PFM

SRT INVE

STF

—

Offset + 0x10

SRTS_TMP

—

SRTS_DEV

Offset + 0x12

—

Valid Octet Size (VOS)

SPV

Structured Pointer (SP)

Offset + 0x14

RBDCNT

Offset + 0x16

—

Offset + 0x18

—

SNEM

—

RXBM

—

Figure 31-28. AAL1 Protocol-Specific RCT

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