MPC8280 datasheet(1115/1386 Pages) FREESCALE

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ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

33-9

33.3.5

AAL2 Tx Data Structures

The following sections describe the transmit connection tables (TCT) and the structures in which CPS

packets and SSSAR SDUs are stored in memory.

33.3.5.1

AAL2 Protocol-Specific TCT

The transmit connection table (TCT) 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 TX Queues of the

ATM channel are maintained here. Figure 33-6 shows the AAL2-specific TCT.

NOTE

When the channel is active, the CP fetches the TCT (32 bytes) using burst

cycle and writes back only the first (24 bytes).

Table 33-1 describes the AAL2 TCT fields.

Offset + 0x00

—

GBL

—

DTB BIB AVCF PFM

ATT

VCON

INTQ

Offset + 0x02

—

NoSTF

AAL

Offset + 0x04

—

Offset + 0x06

Offset + 0x08

—

Offset + 0x0A

FirstQueue

Offset + 0x0C

Rate Remainder

PCR Fraction

Offset + 0x0E

PCR

Offset + 0x10

Timer_CU_period

Offset + 0x12

Timer_Period_Shadow

Offset + 0x14

—

Offset + 0x16

APC Linked Channel

Offset + 0x18

ATM Cell Header (VPI,VCI,PTI,CLP)

Offset + 0x1a

Offset + 0x1C

—

PMT

MaxStep

Offset + 0x1E

—

PFT

—

OneP

STPT

Fix

Figure 33-6. AAL2 Protocol-Specific Transmit Connection Table (TCT)

Table 33-1. AAL2 Protocol-Specific Transmit Connection Table (TCT) Field Descriptions

Offset

Bits

Name1

Description

0x00

0–1

—

Reserved, should be cleared during initialization.

GBL

Global. Setting GBL enables snooping of data buffers, BD, interrupt

queues and free buffer pool.

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