Product Brief
June 2001
TAPC640L3x
ATLANTA
ATM Lite Port Controller (APC Lite)
Introduction
The Agere Systems ATM Lite Port Controller
(APC) IC is part of the ATLANTA chip set that
provides a highly integrated, innovative, and
complete VLSI solution for implementing the
ATM layer of an ATM switch system. The
ATLANTA chip set allows for high-
performance, feature-rich, and cost-effective
ATM switches that are scalable over a wide
range of switching capabilities.
The APC is available in three product tiers to
satisfy different application requirements:
s
APC
s
APC Lite
s
APC Ultra Lite
The APC products can be used with the Agere
Systems PayloadPlusTM components or on its
own.
APC Lite Products
This product brief covers the features of the
APC Lite product tier. The APC Lite is
positioned between the APC and the Ultra Lite
product tiers. The APC Lite is designated for
applications that require a maximum of five
Gbits or less of switching capacity using up to
eight fabric ports.
The APC Lite has the following two
configurations:
s
APC Lite midrange
s
APC Lite basic
Features
The key benefits of the APC are as follows:
s
Provides a comprehensive single-chip
solution for implementing all ATM layer
functions needed at an ATM switch port.
s
Can be configured as an ATM switch port
card (full duplex) or as a stand-alone N:1
concentrator.
s
Performs ATM layer user network interface
(UNI) and network node interface (NNI)
management functions.
s
Provides full-duplex UTOPIA compatible
interfaces.
s
Provides an interface to ATLANTA switch
fabrics to facilitate construction of scalable
network switches.
s
Provides a generic, 32-bit microprocessor
interface with interrupt that supports high-
speed read/write direct memory access
(DMA) modes.
System Configurations
Figure 1: APC Lite Configurations
PHY
/TC
Memory
APC Lite
SAR
Microprocessor
Stand-Alone Switch
1.2 Gbps
622 Mbps
Multi Switch
Memory
APC Lite
Memory
APC Lite
UTOPIA II
UTOPIA II
TAPC640L3x
Product Brief
ATLANTA ATM Lite Port Controller (APC Lite)June 2001
2
Figure 2: APC Lite Block Diagram
The APC Lite can receive and transmit ATM cells from
one or two independently configured, industry-standard
UTOPIA Level 2 interfaces. Once the ATM cells are
received, the APC Lite performs header look-up and
translation, updates the virtual connection table,
performs policing, manages both STATIC and DYNAMIC
thresholds, schedules the traffic, and then transmits the
cells to the switch fabric. Figure 2 shows the APC Lite
components.
External Interfaces
The APC Lite has the following interfaces:
s
Data path interfaces--one or two 8- or 16-bit
independent industry-standard UTOPIA Level 2
interfaces for the data path input and output.
s
Memory interfaces--up to 64K connections for header
lookup and virtual connection tables.
s
Enhanced service interface (ESI)--bidirectional 24-bit
external interface that supports scheduling functions
for ABR virtual source and destination features as well
as customer-defined functions.
s
Microprocessor interface (MPI)--32-bit asynchronous
external interface to the microprocessor for
configuration, maintenance, statistics, read/writes, and
interrupt services.
s
Switch fabric interfaces (SXI)--8-bit parallel data bus
operating at 100 MHz for servicing the ATLANTA
switch fabric with a loopback mode for stand-alone
configurations.
Global Features
The features shared by both APC Lite products are as
follows:
s
Bidirectional bandwidth (622 Mbits/s)
s
Maximum number of fabric ports, virtual output queues
(8)
s
Per VC queuing
s
VP/VC translation and VPI/VCI look up
s
UTOPIA A interface
UTOPIA
Fabric
Buffer
Memory
Buffer
Interface
Control
Memory
VC Table
Memory
To and From
MPHY Device
HLX
VCT
Ingress Queue
Egress Queue
Scheduler
Scheduler
Statistics and OAM
Controller
Policing
Thresholding
Buffer
AFE/ABR Flow
Control Engine
Microprocessor
Synchronization
Pulse
APC IC
External Memory
MPI Microprocessor
I/F and Configuration
Registers
TCT
Time
Counter
To and From
WCK
World
Clock
ESI
Enhanced
Service
Interface
RST
Reset
Drivers
JTG
Test Access Port
and
Scan Controller
ATLANTA
Interface
Fabric
System Clock
Adjunct Device
System Reset
System Test
SXI
TAPC640L3x
Product Brief
ATLANTA ATM Lite Port Controller (APC Lite)
June 2001
3
s
Buffer Management--STATIC (both basic and
midrange) and ADT (midrange only)
s
Stand-alone switching
s
Policing
s
Scheduling--WRR (both basic and midrange) and
hierarchical (midrange only)
s
Multicast--spatial (both basic and midrange) and
logical (midrange only)
s
Package type (600 LBGA)
Unique Features
The unique features that differentiate the APC midrange
and APC basic products are shown in the table below:
Applications
The Agere APC Lite handles ATM cell traffic up to 5
Gbits/s over up to 8 ports (OC-12). Applications include
the following:
s
Routing
s
Switching
s
Network management
s
Monitoring
Feature
Differences
APC Lite
midrange
APC Lite
basic
rt-VBR
yes
WRR
schedulers only
ABR: EFCI and
Explicit Rate
yes
no
Number of
Connections
64k
16k
ADT Buffer
Management
yes
no
UTOPIA B Interface
yes
no
ESI Access per
VC Statistics
yes
no
Hierarchical
Scheduling
yes
no
MPHY
31
16
Virtual MPHY
yes
no
Logical Multicast
yes
no
Agere Systems, Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
PayloadPlus is a trademark of Agere Systems, Inc.
Copyright 2001 Agere Systems, Inc.
All Rights Reserved
Printed in U.S.A.
6/1/01
Document Number PB01-129ATM
Printed On
Recycled Paper
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