Product Brief
June 2001
TAPC640U3x
ATLANTA
ATM UltraLite Port Controller (APC UltraLite)
Introduction
The Agere Systems ATM Port Controller (APC)
UltraLite 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 UltraLite
The APC products can be used with the Agere
Systems PayloadPlusTM components or on its
own.
APC UltraLite Products
This product brief covers the features of the APC
UltraLite product tier. The APC UltraLite products
are designated for applications that require a
maximum of 2.5 Gbits or less of switching
capacity using up to eight fabric ports.
The APC UltraLite has three configurations:
s
APC UltraLite (max configuration)
s
APC UltraLite (mid configuration)
s
APC UltraLite (basic configuration)
Features
The key benefits of the APC UltraLite products
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 UltraLite Configurations
PHY
/TC
Memory
APC UltraLite
SAR
Microprocessor
Stand-Alone Switch
1.2 Gbps
311 Mbps
Multi Switch
Memory
APC
Memory
APC
UTOPIA II
UTOPIA II
UltraLite
UltraLite
TAPC640U3x
Product Brief
ATLANTA ATM UltraLite Port Controller (APC UltraLite)
June 2001
2
Figure 2: APC UltraLite Block Diagram
The APC UltraLite 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 UltraLite 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
UltraLite components.
External Interfaces
The APC UltraLite has the following interfaces:
s
Data Path Interfaces--one or two 8-bit 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 all APC UltraLite products are:
s
Bidirectional bandwidth (311 Mbs)
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
s
Buffer Management--STATIC (all UltraLite products)
and ADT (max and mid configurations only)
s
Stand-alone switching
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
TAPC640U3x
Product Brief
ATLANTA ATM UltraLite Port Controller (APC UltraLite)
June 2001
3
s
Policing
s
Scheduling--WRR (all UltraLite products) and
hierarchical (Max and Mid Configuration only)
s
Multicast--spatial (all UltraLite products) and logical
(max and mid configurations only)
s
Package type (680 plastic)
Unique Features
The unique features that differentiate the APC UltraLite
products from each other (the max configuration, mid
configuration, and basic configuration) are shown in the
table below:
Applications
The Agere APC UltraLite handles ATM cell traffic up to
2.5 Gbits/s over up to 8 ports (OC-6). Applications
include the following:
s
Routing
s
Switching
s
Network management
s
Monitoring
Feature
Differences
APC UltraLite
Maximum Configuration
APC UltraLite
Mid Configuration
APC UltraLite
Basic Configuration
rt-VBR
yes
yes
WRR schedulers only
ABR: EFCI and explicit rate
yes
yes
no
Number of connections
64k
64k
16k
ADT Buffer Management
yes
yes
no
UTOPIA B Interface
yes
yes
no
ESI Access:
VS/VD
VC per Statistics
yes
yes
no
yes
no
no
Hierarchical scheduling
yes
yes
no
MPHY
31
31
16
Virtual MPHY
yes
yes
no
Logical multicast
yes
yes
no
Switching: back-back operations
yes
no
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 PB01-130ATM
For additional information, contact your Agere Systems Account Manager or the following:
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Tel. (65) 778 8833, FAX (65) 777 7495
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Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700
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