MPC8280 datasheet(1117/1386 Pages) FREESCALE

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ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

33-11

0x02

0–11

—

Reserved, should be cleared during initialization.

NoSTF

No STF byte. See Section 33.3.4, “No STF Mode.”

0 Normal AAL2 cell structure.

1 The cell does not include the STF byte. In this mode each cell starts with

a new packet and contains only whole packets (no split or partial).

13–15

AAL

AAL type

000

AAL0 —Segmentation with no adaptation layer

001

AAL1 —ATM adaptation layer 1 protocol

010

AAL5 —ATM adaptation layer 5 protocol

100

AAL2 —ATM adaptation layer 2 protocol

101

AAL1_CES. Refer to Chapter 32, “ATM AAL1 Circuit Emulation

Service.”

All others reserved.

0x04

—

Reserved, should be cleared during initialization.

0x06

—

Reserved, should be cleared during initialization.

0x08

—

Reserved, should be cleared during initialization.

0x0A

—

FirstQueue

Points to the first queue to be serviced in the transmitter cycle. In

round-robin priority mode (TCT[Fix]=0), this pointer could point to any one

of the TxQDs related to this channel. In fixed priority mode (TCT[Fix]=1),

this pointer should point to the highest priority TxQD.

0x0C

0–7

Rate Remainder

Rate remainder. Used by the APC to hold the rate remainder after adding

the pace fraction to the additive channel rate. Should be cleared during

initialization by the user.

8–15

PCR Fraction

Peak cell rate fraction. Holds the peak cell rate fraction of this channel in

units of 1/256 slot. If this is an ABR channel, this field is automatically

updated by the CP.

0x0E

—

PCR

Peak cell rate. Holds the peak cell rate (in units of APC slots) permitted

for this channel according to the traffic contract. Note that for an ABR

channel, the CP automatically updates PCR to the ACR value.

0x10

—

Timer_CU_period

Timer_CU duration in units of APC slots. Assures that CPS-Packet

already packed in a cell wait at most the Timer_CU duration. The user

defines this field.

0x12

—

Timer_Period_Shadow This field must be initialized to the Timer_CU period in units of APC slots.

0x14

—

Reserved, should be cleared during initialization.

0x16

—

APCLC

APC linked channel. Used by the CP. Should be cleared during

initialization.

0x18

—

ATMCH

ATM cell header. Holds the full (4-byte) ATM cell header of the current

channel. The transmitter appends ATMCH to the cell payload during

transmission.

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

Offset

Bits

Name1

Description

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