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).