MPC8280 datasheet(987/1386 Pages) FREESCALE

987 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-27

Initialize the traffic parameters (ER, MCR, PCR, or ICR) in the ABR protocol-specific connection tables

using the rate formula in Figure 31-16.

31.5.3

ABR Flow Control Setup

Follow these steps to setup ABR flow control:

1. Initialize the ABR data structure: RCT, TCT, RCT-ABR protocol-specific, TCTE-ABR

protocol-specific.

2. Initialize ABR global parameters in the parameter RAM. See Section 31.10.1, “Parameter RAM.”

3. Program the AAL-type in the RCT and TCT to AAL5 and set TCT[ABRF].

NOTE

ABR flow control is available only with AAL5.

4. The time stamp timer generates the RM cell’s time stamp, which the ABR flow control monitors

to maintain source behavior in steps #3 and #7 of Section 31.5.1.1, “ABR Flow Control Source

End-System Behavior.” Enable the time stamp timer by writing to the RTSCR; see Section 14.3.8,

“RISC Time-Stamp Control Register (RTSCR).”

5. Initialize the ABR parameters (CPS_ABR and LINE_RATE_ABR) in the APCT; see

Section 31.10.4.1, “APC Parameter Tables.” Note that when using ABR, the CPS (cells per slot)

parameter in the APCPT should be a power of two.

6. Finally, send the ATM TRANSMIT command to restart channel transmission.

31.6

OAM Support

This section describes the MPC8280’s support for ATM-layer (F4 out-of-band, and F5 in-band) operations

and maintenance (OAM) of connections. Alarm surveillance, continuity checking, remote defect

indication, and loopback cells are supported using OAM receive and transmit AAL0 cell queues. Using

dedicated support, performance management block tests can be performed on up to 64 connections

simultaneously. The CP automatically inserts forward monitoring cells (FMC) and generates

backward-reporting cells (BRC) as recommended by ITU I.610.

31.6.1

ATM-Layer OAM Definitions

Table 31-8 lists pre-assigned header values at the user-network interface (UNI).

Table 31-8. Pre-Assigned Header Values at the UNI

Use

GFC

VPI

VCI

PTI

CLP

Segment OAM F4 flow cell

xxxx

aaaa_aaaa

0000_0000_0000_0011

0a0

End-to-end OAM F4 flow cell

xxxx

aaaa_aaaa

0000_0000_0000_0100

0a0

Segment OAM F5 flow cell

xxxx

aaaa_aaaa

aaaa_aaaa_aaaa_aaaa

100

End-to-end OAM F5 flow cell

xxxx

aaaa_aaaa

aaaa_aaaa_aaaa_aaaa

101

a = available for use by the appropriate ATM layer function

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