Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 965

36.3 ATM Features
The MPC885 supports the following features:
• Serial ATM capability on the SCCs
• Optional UTOPIA port using SCC4
• Cell processing up to 96 Mbps aggregate receive and transmit via UTOPIA interface (with 80 MHz
system clock)
• Cell processing up to 32 Mbps aggregate receive and transmit via serial interface (with 80 MHz
system clock)
• Memory-to-memory cell processing (via UTOPIA or serial interface with internal loopback). This
allows direct memory-to-memory segmentation and reassembly.
• Performs transmission convergence (TC) to E1/T1/xDSL serial lines
• Management (OAM) (operation administration & maintenance) cell filtering or monitoring based
on segment or end-to-end indication
• OAM performance monitoring (PM)
• Support of AAL0 and AAL5 protocols on a per virtual circuit (VC) basis
• AAL0 support allows other AAL types to be implemented in application software.
• AAL2 support.
• Support for 32 active VCs using internal dual-port RAM, and up to 64K using external memory
• Flexible and efficient cell rate pacing support for CBR, VBR and UBR, with software hooks
provided for host-managed ABR services
• Supports UTOPIA and serial (E1/T1) interfaces
• Compliant with ATM Forum UNI 4.0 specification
• CLP and congestion indication marking in RxBD
• Dynamic CLP and congestion marking in TxBD
• Separate transmit and receive buffer descriptor (BD) tables for each channel
• Support for VP forwarding by aggregating multiple Port-To-Port receivers into one transmitter
• Interrupt reporting optionally enabled per channel
• Supports 53-byte to 65-byte (expanded) ATM cell size
• Optional statistical cell counters per PHY
• Glueless serial interface
• Supports AAL5 connections:
— Reassembly:
– Reassembles CPCS_PDU directly to host memory
– CRC32 check
– CPCS_PDU padding removal
– CS_UU, CPI, and LENGTH reporting
– CLP and congestion reporting
– Interrupt per buffer or per frame
Freescale Semiconductor
MPC885 PowerQUICC Family Reference Manual, Rev. 2
ATM Overview
36-3