Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 974

Powerquicc family

Table of Contents

ATM Overview

application combining PTP and SAR functionality. In the example, SCC3 has three sources of ATM traffic:

PTP, SAR and host cells (for management).

36.11 Memory-to-Memory SAR

Both UTOPIA and serial interface internal loopback are available to allow memory-to-memory

segmentation and reassembly. Examples are as follows:

For segmentation operations, transmitted AAL5 common part convergence sublayer- protocol data

units (CPCS-PDUs) can be received and stored as ATM protocol data units (ATM-PDUs); that is,

each transmitted AAL5 CPCS-PDU can be converted into ATM-PDUs, looped back and stored

into receive buffers as individual ATM-PDUs by programming the RCT for the same channel to

For reassembly operations, stored ATM-PDUs can be transmitted in AAL0 mode, looped back and

reassembled as AAL5 CPCS-PDUs by converting each sequence of received ATM-PDUs in AAL5

36.12 General ATM Initialization Requirement

All ATM parameter RAM areas and data structures, such as the connection tables and APC priority levels,

should be cleared before beginning the actual system initialization process.

Direct Port-to-Port

Cell Switching

(OAM, Signaling etc.)

Ethernet Frames

Figure 36-3. Example PTP Switching Application

MPC885 PowerQUICC Family Reference Manual, Rev. 2

Freescale Semiconductor