MC92501 Datasheet, PDF (22/52 Pages) Motorola, Inc – ATM Cell Processor

SECTION 9. EGRESS OVERHEAD MANIPULATION
The MC92501 supports the following features:
¥ The size of the ECI Þeld used by the egress cell processing
block can be programmed by writing to the ECESÑEgress
Cell Processing Block ECI Size Þeld in the Egress
Overhead Manipulation Register (EGOMR).
¥ The size of the MTTS Þeld used by the egress cell
processing block can be programmed by writing to the
ECTSÑEgress Cell Processing Block MTTS Size Þeld in
the EGOMR.
Â¥ The M bit used by the egress cell processing block can be
either the M bit which was extracted from the cellÕs
overhead, the logical not of the M bit which was extracted
from the cellÕs overhead, or 1 or 0 by programming the
ECMSÑEgress Cell Processing Block M Bit Source Þeld
in the EGOMR.
Â¥ In ECI on Header mode, the ECI is extracted from the ATM
cell header. The header VPI Þeld size can be programmed
to either 12 bits or 8 bits using the VPSÑVPI Size in ECI
on Header Mode bit of the Egress Switch Interface
ConÞguration Register (ESWCR).
MC92501
22
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