Motorola PowerQUICC II MPC8280 Series Reference Manual page 1213

— IMA frame synchronization--finding IMA frame boundaries within links
— Stuffing--insertion of 'stuff' cells into fast links, in order to maintain an average
data rate between links of a group
— Discards cells with bad HECs (available on .25µm (HiP4) rev B silicon and
forward)
• Delay synchronization--correlating IMA frames among links of a group
• Maximum differential delay supported is user-programmable
• Optionally recovers IMA data clock rate (IDCR)
• Provides interrupts on errors/state changes
• Maintains low-level statistic counters
— Transmit stuff events
— Receive stuff events
— Receive ICP violations
— Receive Out-of-IMA Frame anomalies
34.1.1 References
The features provided by the IMA microcode are driven by The ATM Forum's IMA
specification. The implementation of the IMA microcode is driven by the features,
architecture, and resources available on the MPC8280. In addition to published MPC8280
device errata, users should
www.atmforum.com):
• The ATM Forum Technical Committee. Inverse Multiplexing for ATM (IMA)
Specification Version 1.1 - AF-PHY-0086.001
• The ATM Forum Technical Committee. Inverse Multiplexing for ATM (IMA)
Specification Version 1.0 - AF-PHY-0086.000
34.1.2 IMA Versions Supported
The IMA microcode supports IMA version 1.0 and version 1.1, with only minor
configuration changes. These include the following:
• Programming the IMA version encoding in the OAM labels of the transmit ICP and
Filler cell templates.
• Programming the validated OAM label field in the IMA group receive parameters.
34.1.3 MPC8280 Versions Supported
IMA support in ROM is available on the
of the MPC8280 family, integrated DS1/E1 transmission convergence (TC) layer hardware
MOTOROLA
Freescale Semiconductor, Inc.
be familiar
MPC8264 and the
Chapter 34. Inverse Multiplexing for ATM (IMA)
For More Information On This Product,
Go to: www.freescale.com
with the following
MPC8266. On these derivatives
Features
(available at
34-3