MPC8280 datasheet(1129/1386 Pages) FREESCALE

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ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

33-23

33.4.4.1

AAL2 Protocol-Specific RCT

The receive connection table (RCT) is a VC-level table and is where the AAL type for the ATM channel

number is selected. The parameters related to the ATM channel number or to all the RX Queues of the

ATM channel are maintained here. The RCT also contains the pointer to the CID mapping table for the

ATM VC. Figure 33-15 shows the AAL2-specific RCT.

NOTE

For an active channel, the CP uses a burst cycle to fetch the 32-byte RCT

and writes back only the first 24 bytes.

Table 33-6 describes the AAL2 RCT fields.

910

1112

Offset + 0x00

—

GBL

—

DTB

BIB

—

SEGF

ENDF

—

MAP

INTQ

Offset + 0x02

—

NoSTF

AAL

Offset + 0x04

—

Offset + 0x06

Offset + 0x08

Offset + 0x0A

Offset + 0x0c

Offset + 0x0e

Offset + 0x10

Offset + 0x12

Offset + 0x14

Offset + 0x16

Offset + 0x18

CID Mapping Table Base

Offset + 0x1A

Offset + 0x1C

—

PMT

TBNR Time OUT CNT

Offset + 0x1E

Max_CPS_SDU_Deliver_length

—

EM PM

Figure 33-15. AAL2 Protocol-Specific Receive Connection Table (RCT)

Table 33-6. AAL2 Protocol-Specific RCT Field Descriptions

Offset

Bits

Name 1

Description

0x00

0–1

—

Reserved, should be cleared during initialization.

GBL

Global. Setting GBL enables snooping of data buffers, BDs, interrupt queues and free

buffer pool.

3–4

Byte ordering—used for data buffers.

00 Reserved

01 munged little endian

1x Big endian

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