TNETA1575

ATM SEGMENTATION AND REASSEMBLY DEVICE

WITH PCI-HOST AND COPROCESSOR INTERFACES

SDNS040C – MAY 1996 – REVISED JUNE 1998

1

POST OFFICE BOX 655303

AAL5 Packets in Accordance With ITU-T

Specifications I.361 and I.363

(11/93 Update)

Interface for Transferring Packet Data to

and From Host Memory

to 2048 Packets

to 2048 Packets

and 16 VCI Bits) for Transmit and Receive

Operations

via High-Priority Mechanism or Local Static

Scheduler Table

in 32-Bit PCI Mode

(ABR) Traffic via External Coprocessor

Interface (COPI)

External COPI

SAR Polling Channels When No Packets

Are Queued

Sideband Signals to Reduce Polling Across

the PCI Bus

Can Be Performed Indirectly via the

TNETA1575 Local Peripheral Bus

Into the TNETA1575 PCI-Bus Address

Space

Information

and Receive Buffer Chaining)

Segmentation Begins Once a Transmit

Buffer Is Filled, Instead of Waiting for the

Entire Packet to Be Available in Host

Memory

an Outgoing Cell

Operate as Either a Physical (PHY-Layer)

Interface or as a SAR/Switch (ATM-Layer)

Interface

Incoming Packets

From Transmit to Receive

Five-Wire JTAG Interface in Accordance

With IEEE Std 1149.1-1990 (Includes IEEE

Std 1149.1a-1993)

description

The TNETA1575 is an asynchronous transfer mode (ATM) segmentation and reassembly (SAR) device with

a peripheral component interconnect (PCI)-bus interface and a coprocessor interface (COPI). The TNETA1575

continues the line of Texas Instruments (TI)

™ ATM SAR devices directed toward the classical LAN-to-ATM

translation market segment. Features have been extended to include the COPI interface, which interfaces to

an external scheduler with high-performance features to eliminate polling on the PCI bus. The TNETA1575 is

designed for the emerging class of high-performance enterprise networking hubs that utilize ATM in the

backplane, in addition to the traditional frame-/packet-based bus systems. Some of the features required for

this application include: high level of virtual channel/virtual path support, support for isochronous services, early

segmentation, and high-performance, 32-bit PCI-bus support. The feature set required by cell-operating

enterprise hubs is different from the sets being offered by other SAR devices, which are directed primarily toward

the adapter card market.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

© 1998, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Thundercell and TI are trademarks of Texas Instruments Incorporated.