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PM7366 FREEDM-8
APPLICATION NOTE PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
PM7366
FREEDM-8
FRAME ENGINE AND DATA LINK MANAGER
TECHNICAL OVERVIEW
ISSUE 2: SEPTEMBER 1997
PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000
PM7366 FREEDM-8
APPLICATION NOTE PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
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PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000
PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
CONTENTS 1 OVERVIEW .............................................................................................. 1 1.1 2 3 4 5 ADDITIONAL FREEDM-8 DOCUMENTATION .............................. 2
APPLICATION EXAMPLES...................................................................... 3 GLOSSARY.............................................................................................. 7 NOTES ................................................................................................... 10 CONTACTING PMC-SIERRA................................................................. 11
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
1
OVERVIEW
The FRame EnginE and Data Link Manager (FREEDM-8) is an advanced data link layer processor that is ideal for applications such as Internet access equipment, frame relay switches, ATM switches, packet-based CDMA base station controllers and Digital Subscriber Loop Access multiplexers (DSLAM). The cornerstone of the FREEDM-8 product is the revolutionary TimePipeTM architecture (as shown in Figure 1). The TimePipe architecture enables a single FREEDM-8 device to support up to 8 full-duplex physical links, 128 HDLC channels and 8 KB of integral packet buffer in each of the transmit and receive direction. Each one of the 8 physical links can be independently timed from 56 Kbit/s to 52 Mbit/s. This unparalleled level of integration not only simplifies networking equipment designs, but also enables a new generation of line card designs that can use a common data link layer processor for a wide variety of line rates ranging from T1, E1, E3, T3 to HSSI. Figure 1: FREEDM-8 Block Diagram and the TimePipe Architecture
LINK SIDE FREEDM-8 TimePipeTM Architecture
8
SYSTEM SIDE
Transmit Channel Mapper
Transmit HDLC Controller
128
Transmit Buffer (8KB)
Transmit DMA Controller
Links 8
HDLC Channels
PC I Interface
Receive Buffer (8KB) Receive DMA Controller
Receive Channel Mapper
Receive HDLC Controller
128
Power is useful only if it can be directed to perform the intended work. The TimePipe architecture is not only powerful but also highly configurable as well. A flexible channel mapper mechanism is provided such that any link can be assigned to any HDLC channel in software. In the case of a channelized application, data carried on one or more time-slots within the same link can be grouped and assigned to a single HDLC channel.
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
The 8KB packet buffer can be flexibly allocated to active HDLC channels. The 8KB buffer is organized as 512 blocks of 16 byte FIFOs. The number of blocks assigned to any HDLC channel is configurable in software. In the receive direction, the Receive HDLC Controller performs flag delineation, bit destuffing, CRC verification using either CRC-32 or CRC-CCITT algorithm and length checking. In the transmit direction, the Transmit HDLC Controller performs flag insertion, bit stuffing and FCS calculation using either CRC-32 or CRC-CCITT algorithm. On the system side, FREEDM-8 provides a 33 MHz, 32 bit PCI 2.1 compliant bus interface. Two efficient transmit and receive DMA controllers are provided to support burst data transfers across the PCI bus. FREEDM-8 is packaged in a 256 pin BGA package with a physical dimension of 27 mm by 27 mm. 1.1 Additional FREEDM-8 Documentation
A list of FREEDM-8 documents is provided below. Please contact PMC-Sierra for an updated list.
Document Number PMC-970532 PMC-970931 PMC-970930 PMC-970935 PMC-970933
Document Title FREEDM-8 Short Form Datasheet FREEDM-8 Technical Overview FREEDM-8 Datasheet FREEDM-8 Bus Application Note Utilization and Latency Test
Interfacing FREEDM-8 to the ST-Bus Application Note.
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
2
APPLICATION EXAMPLES
FREEDM-8 is ideal for networking equipment supporting a large number of data links. Figure 2 shows the typical architecture for an Internet access concentrator. Figure 2: Typical Architecture of an Internet Access Concentrator
ACCESS SIDE UPLINK SIDE
T1
PM4314 QDSX
PM4388 TOCTL
FREEDM-8
T1 Access Module PCI Bus
HSSI Module HSSI Uplink Module
HSSI
E1
PM4314 QDSX
PM6344 EQUAD
Packet Memory
Microprocessor
E1 Access Module
Processor Module
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
Figure 3: 2 unchannelized DS3 links using FREEDM-8 and a SUNI-QJET
1 PM7366 FREEDM-8 1 PM7346 SAR SUNI-QJET
1 T3 LIU T3
1 T3 LIU T3
For direct T1 access, the TOCTL seamlessly interfaces to two PM4314 QDSX to support eight T1 links as shown in Figure 4. The QDSX integrates four full-featured T1/E1 duplex DSX-1 compatible line interface circuits in a single device. The QDSX is currently in production and is packaged in a 128 PQFP. Figure 4: 8 Channel T1 Interface for Frame Relay or Internet Access
4
PM4314 QDSX
4 T1
PM7366 FREEDM-8
8
PM4388 TOCTL
4
PM4314 QDSX
4
T1
4
PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
For direct E1 access, the EQUAD seamlessly interfaces to two PM4314 QDSX to support eight E1 links as shown in Figure 5. The QDSX integrates four full-featured T1/E1 duplex DSX-1 compatible line interface circuits in a single device. The QDSX is currently in production and is packaged in a 128 PQFP. Figure 5: 8 Channel E1 Interface for Frame Relay or Internet Access
4
PM6344 EQUAD
4
PM4314 QDSX
4 E1
PM7366 FREEDM-8
8
4
PM6344 EQUAD
4
PM4314 QDSX
4
E1
On the uplink side, FREEDM-8 can interface to two high speed links such as HSSI, DS3 or E3. FREEDM-8 can also be used on the access side of a packet-based DSLAM to interface with xDSL physical layer devices (as shown in Figure 6). In this application, FREEDM-8 performs data link layer processing on packet data transferred between the xDSL network and the packet memory. For a DSLAM with ATM uplinks, a segmentation and reassembly (SAR) device is required to convert packets into ATM cells. The cells are switched by an ATM switching fabric (not shown) and sent out on one of the ATM uplinks: * * * * The PM7346 S/UNI-PDH can be used for a DS-3/E3 ATM uplink; The PM5346 S/UNI-LITE or PM5348 S/UNI-DUAL can be used for an OC-3 ATM UNI uplink; The PM5347 S/UNI-PLUS can be used for an OC-3 ATM NNI uplink; The PM5355 S/UNI-622 can be used for an OC-12 ATM UNI or NNI uplink.
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
Figure 6: DSLAM with ATM Uplinks
ACCESS SIDE ATM UPLINK SIDE
PM7345 S/UNI-PDH
DS3/E3 DS3/E3 ATM FREEDM-8 SAR PCI Bus STS-3c ATM UNI xDSL XDSL PHY xDSL Access Module
PM7322 RCMP PM5346 S/UNI-LITE PM5348 S/UNI-DUAL
OC-3
Packet Memory
Microprocessor
PM5347 S/UNI-PLUS
OC-3
STS-3c ATM NNI
PM5355 S/UNI-622
OC-12
Processor Module
STS-12c ATM UNI/NNI
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
3
GLOSSARY
Bit Stuffing
A process in data communications protocols where a string of "one" bits in the data payload is broken by an inserted "zero". The idea of inserting the zero is to ensure that no flag control character is found in the user payload. Cyclic Redundancy Check: Check sums generated from recursive algorithms that can be used to determine the integrity of data by a receiver. Certain CRC algorithms allows the receiver to detect as well as correct certain number of bit errors. Data Link Connection Identifier (DLCI): The frame relay virtual circuit number corresponding to a particular destination which is part of the frame relay header and is usually ten bits long. The DLCI is typically associated with a particular PVC on the network. Digital Service, level 0: There are 24 DS-0 channels in a DS-1. Each DS-0 has a bandwidth of 64 Kbit/s. Digital Service, level 1: It is 1.544 Mbit/s in North America. In channelized mode, each DS-1 consists of 24 DS-0 channels. In unchannelized mode, each DS-1 has a fullduplex bandwidth of 1.544 Mbit/s. Digital Service, level 3: DS-3 is equivalent to 28 DS-1 channels. It operates at 44.736 Mbit/s. Digital Subscriber Loop Access Multiplexer: Frame Check Sequence: Bits added to the end of a frame for error detection. In bit-oriented protocols, a frame check sequence is a 16-bit field added to the end of a frame that contains transmission error-checking information. In synchronous transmission, a flag is a pattern of "01111110" used to mark the beginning and end of a frame. Frame Relay Access Device.
CRC
DLCI
DS-0 DS-1
DS-3 DSLAM FCS
Flag
FRAD
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
Frame
A frame is also referred to as a "packet" and is a logical transmission unit. A frame consists of a group of data bits in a specific format. Generally, a flag is used at each end of the frame to delimit the start and end of the frame. The term "frame relay" is used in multiple contexts and can be used to refer to a switching technology, an interface standard or a set of data services. Refers to simultaneous transmission in two directions. High Level Data Link Control: protocol developed by ITU. High Speed Serial Interface Internet Service Provider: Electronic equipment which allows two or more signals to pass over one communication circuit. Network Access Point: Open System Interconnect: An ISO publication that defines seven independent layers of communication protocols. Each layer enhances the communication services of the layer just below it and shields the layer above it from the implementation details of the lower layer. The only internationally accepted framework of standards for communication between different systems made by different vendors. The OSI model organizes the communications process into the following seven layers: Layer 1 - Physical Layer Layer 2 - Data Link Layer Layer 3 - Network Layer Layer 4 - Transport Layer Layer 5 - Session Layer Layer 6 - Presentation Layer Layer 7 - Application Layer A packet is also referred to as a "frame" and is a logical transmission unit. Peripheral Component Interconnect A standard bit-oriented
Frame Relay
Full-Duplex HDLC HSSI ISP Multiplexor NAP OSI
OSI Model
Packet PCI
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
POP
Point of Presence: In telecommunication, POP refers to the physical place within a LATA where a long distance carrier interfaces with the network of the local exchange carrier. User Network Interface: The physical and electrical demarcation point between the user and the public network service provider.
UNI
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
4
NOTES
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PM7366 FREEDM-8
TECHNICAL OVERVIEW PMC-970931 ISSUE 2 FRAME ENGINE AND DATA LINK MANAGER
5
CONTACTING PMC-SIERRA, INC.
PMC-Sierra, Inc. 105-8555 Baxter Place Burnaby, BC Canada V5A 4V7 Tel: Fax: (604) 415-6000 (604) 415-6200 document@pmc-sierra.com info@pmc-sierra.com apps@pmc-sierra.com http://www.pmc-sierra.com
Document Information: Corporate Information: Application Information: Web Site:
None of the information contained in this document constitutes an express or implied warranty by PMC-Sierra, Inc. as to the sufficiency, fitness or suitability for a particular purpose of any such information or the fitness, or suitability for a particular purpose, merchantability, performance, compatibility with other parts or systems, of any of the products of PMC-Sierra, Inc., or any portion thereof, referred to in this document. PMC-Sierra, Inc. expressly disclaims all representations and warranties of any kind regarding the contents or use of the information, including, but not limited to, express and implied warranties of accuracy, completeness, merchantability, fitness for a particular use, or non-infringement. In no event will PMC-Sierra, Inc. be liable for any direct, indirect, special, incidental or consequential damages, including, but not limited to, lost profits, lost business or lost data resulting from any use of or reliance upon the information, whether or not PMC-Sierra, Inc. has been advised of the possibility of such damage. (c) 1997 PMC-Sierra, Inc. PMC-970931 (R2) Issue date: September 1997
PMC-Sierra, Inc.
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000

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