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DS31256

256-Channel, High-Throughput HDLC Controller

256-Channel HDLC Controller Capable of Handling Up to 60 T1 or 64 E1 Data Streams or Two T3 Data Streams

Overview

Technical Documents

Ordering Info

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Status

Part Number	Status
DS31256	This product is Not Recommended for New Designs.

Description

The DS31256 is a 256-channel HDLC controller that can handle up to 60 T1 or 64 E1 data streams or two T3 data streams. Each of the 16 physical ports can handle one, two, or four T1 or E1 data streams. The DS31256 is composed of the following blocks: Layer 1, HDLC processing, FIFO, DMA, PCI bus, and local bus.

There are 16 HDLC engines (one for each port) that are each capable of operating at speeds up to 8.192Mbps in channelized mode and up to 10Mbps in unchannelized mode. The DS31256 also has three fast HDLC engines that only reside on Ports 0, 1, and 2. They are capable of operating at speeds up to 52Mbps.

Data Sheet

Download	Rev 4	(PDF, 1.2MB)
E-Mail

Errata DS31256 31256B2.pdf
Errata DS31256 31256A2.pdf

Key Features

256 Independent, Bidirectional HDLC Channels
Up to 132Mbps Full-Duplex Throughput
Supports Up to 60 T1 or 64 E1 Data Streams
16 Physical Ports (16 Tx and 16 Rx) That Can Be Independently Configured for Channelized or Unchannelized Operation
Three Fast (52Mbps) Ports; Other Ports Capable of Speeds Up to 10Mbps (Unchannelized)
Channelized Ports Can Each Handle One, Two, or Four T1 or E1 Lines
Per-Channel DS0 Loopbacks in Both Directions
Over-Subscription at the Port Level
Transparent Mode Supported
On-Board Bit Error-Rate Tester (BERT) with Automatic Error Insertion Capability
BERT Function Can Be Assigned to Any HDLC Channel or Any Port
Large 16kB FIFO in Both Receive and Transmit Directions
Efficient Scatter/Gather DMA Maximizes Memory Efficiency
Receive Data Packets are Time-Stamped
Transmit Packet Priority Setting
V.54 Loopback Code Detector
Local Bus Allows for PCI Bridging or Local Access
Intel or Motorola Bus Signals Supported
Backward Compatibility with DS3134
33MHz 32-Bit PCI (V2.1) Interface
3.3V Low-Power CMOS with 5V Tolerant I/O
JTAG Support IEEE 1149.1
256-Pin Plastic BGA (27mm x 27mm)

Features continued on page 6 of the PDF data sheet.

Applications/Uses

Channelized and Clear Channel (Unchannelized) T1/E1 and T3/E3
High-Density Frame-Relay Access
High-Density V.35
Routers with Multilink PPP Support
SONET/SDH EOC/ECC Termination
Triple HSSI
xDSL Access Multiplexers (DSLAMs)

Diagram

Block Diagram

Application Notes

Application Note 390		DS31256 and T1/E1 Interface
Application Note 392		DS31256 Gapped Clock Applications
Application Note 399		DS31256 Loopback Modes
Application Note 2867		Initialization Steps for the DS31256
Application Note 2871		DS31256 HDLC Controller Step-by-Step Configuration—Configuration Mode
Application Note 2872		DS31256 HDLC Controller Step-by-Step Configuration—Bridge Mode
Application Note 3071		Internal Test Registers for the DS31256
Application Note 3259		DS31256 Envoy—Example Code for Registers Dump
Application Note 3344		DS31256 -- T3/E3 MUX/DS3112 Hardware Connections
Application Note 3345		Examples of DS31256 Applications
Application Note 3347		DS31256 Unchannelized T3/E3/HSSI/VDSL Port Configuration for Bridge Mode Applications
Application Note 3475		DS31256 PCI Bus Utilization
Application Note 3760		Interleaved Bus Operation
Application Note 3818		Enabling Fractional-T1 (FT1) Loopback Detection on the DS31256

Product Guides

Communications (PDF)

Reliability Reports

Reliability Report:

DS31256.pdf

Software/Models

DS31256 BSDL Model

DS31256 Cadence Concept Symbol

DS31256 IBIS Model

DS31256 Logical Symbol-XML Format

DS31256_A2 BSDL Model

DS31256_B1 BSDL Model

DS31256_B2 BSDL Model

DS31256_B2V BSDL Model

Ordering Information

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Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS31256			NRND	PBGA;256 pin;729 mm² Outline Drawing:21-0307 (PDF) Land Pattern: 90-0267 (PDF) Use pkgcode/variation: V256-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS31256+		N/A	NRND	BGA; Land Pattern: Not Available	0°C to +70°C	See data sheet
DS31256B			NRND	PBGA;256 pin;729 mm² Outline Drawing:21-0307 (PDF) Land Pattern: 90-0267 (PDF) Use pkgcode/variation: V256-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

More Information

New Product Press Release

[ 2002-11-21 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Errata Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 4; 2006-01-27
This page last modified: 2009-10-13