PM7324-BGI

FEATURES

Point form summary of features.
• Monolithic single chip device which handles bi-directional ATM Layer functions including
VPI/VCI address translation, cell appending (ingress only), cell rate policing (ingress only),
per-connection counting and I.610 compliant OAM requirements for 65536 VCs (virtual
connections).
• Instantaneous bi-directional transfer rate of 800 Mbit/s supports a bi- directional cell transfer
rate of 1.42x106 cells/s (one STS-12c or four STS-3c).
• The Ingress input interface supports an 8 or 16 bit SCI-PHY interface using direct addressing
for up to 4 PHY devices (compatible with Utopia Level 1 cell-level handshaking) and Multi-PHY
addressing for up to 32 PHY devices (Utopia Level 2 compatible).
• The Ingress output interface supports an 8 or 16 bit SCI-PHY (52 – 64 byte extended ATM cell
with prepend/postpend) interface (compatible with Utopia Level 1 cell-level handshaking) to a
switch fabric.
• The Egress input interface supports an 8 or 16 bit extended cell format SCI- PHY interface
using direct addressing for up to 4 PHY devices (compatible with Utopia Level 1 cell-level
handshaking) and Multi-PHY addressing for up to 32 PHY devices (Utopia Level 2
compatible).
• The Egress output interface supports an 8 or 16 bit extended cell format SCI-PHY interface
using direct addressing for up to 4 PHY devices (compatible with Utopia Level 1 cell-level
handshaking) and Multi-PHY addressing for up to 32 PHY devices (Utopia Level 2
compatible).
• Compatible with a wide range of switching fabrics and traffic management architectures
including per-VC or per-PHY queuing.
• Highly flexible OAM-type cell and connection identification which can use arbitrary
PHYID/VPI/VCI values and/or cell appended bytes for connection identification (N.B. this is an
ingress function only). A direct lookup function is provided in the egress direction. The direct
lookup can use an arbitrary header or prepend/postpend location.
• Ingress functionality includes a highly flexible search engine that covers the entire
PHYID/VPI/VCI address range, programmable dual leaky bucket UPC/NPC, per- connection
CLP0 and CLP1 cell counts (programmable), OAM-PM termination, generation and
monitoring, and OAM-FM termination, generation and alarm generation (monitoring).
• Egress functionality includes programmable direct lookup function, OAM-PM termination,
generation and monitoring, per-connection CLP0 and CLP1 cell counts (programmable) and
OAM-FM termination, generation and alarm generation (monitoring). An egress per-PHY
output buffering scheme resolves the head-of-line blocking issue.
• UPC/NPC function is a programmable dual leaky bucket policing device with a programmable
action (tag, discard, or count only) for each bucket. A total of 3 programmable 16 bit
noncompliant cell counts are provided. The non-compliant cell counts may be programmed to
count, for example, dropped CLP0 cells, dropped CLP1 cells, and tagged CLP0 cells. The
UPC/NPC function also has a continuously violating mode, where a programmable action is
taken on all cells regardless of their compliance. AAL5 partial packet discard is also provided
so that the remainder of an AAL5 packet can be tagged or discarded if a single cell in the
packet is tagged or discarded as a result of violating policing.
• In addition to the per-connection dual leaky bucket, a single leaky bucket UPC/NPC function is
provided on a per-PHY basis. A programmable action (tag, discard or count only) may be
configured for each PHY policing device. Three programmable non-compliant cell counts are
provided for each PHY. The non-compliant cell counts may be programmed to count, for
example, dropped CLP0 cells, dropped CLP1 cells and tagged CLP0 cells. The per-PHY
policing parameters and non-compliant cell counts are maintained in an on-chip RAM that can
be programmed and read via the 16-bit general purpose microprocessor interface.
• Guaranteed Frame Rate frame-based policing selectable on a per-connection basis.

APPLICATIONS

• Wide Area Network ATM Core and Edge switches.
• ATM Enterprise and Workgroup switches.
• Broadband Access multiplexers.
• XDSL Access Multiplexers (DSLAMs).