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CD2481 Datasheet

Programmable 4-Channel Communications Controller

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CD2481
Programmable Four-Channel Communications Controller
Datasheet
The CD2481 is a four-channel synchronous/asynchronous communications controller
specifically designed to reduce host-system processing overhead and increase efficiency in a
wide variety of communications applications. A special member of the CD24X1 family, the
device allows easy field upgrades and enhancement with an on-chip 8K-word microcode store
for downloaded control code. The CD2481 is packaged in a 100-pin MQFP package that offers
10 data/clock/modem pins per channel. The device has four fully independent serial channels to
support standard asynchronous, PPP, MNP4, SLIP, bit-synchronous (HDLC), and byte-
synchronous (bisync, X.21) protocols. The device is non-functional until the microcode is
downloaded; only a small boot ROM with code to perform device initialization is included.
The device is based on a proprietary on-chip RISC processor that performs all the time-critical,
low-level tasks otherwise performed by the host system.
The CD2481 boosts system efficiency with eight on-chip DMA channels, on-chip FIFOs (16
bytes/direction), intelligent vectored interrupts, and intelligent protocol processing. The on-chip
DMA controller provides ‘fire-and-forget’ transmit support — the host need only inform the
CD2481 of the location of the packet to send. Similarly, on receive, the CD2481 automatically
receives a complete packet with no host intervention or assistance. The DMA controller also has
a transmit ‘Append mode’ for use in asynchronous applications.
The DMA controller uses a dual-buffer scheme that easily implements simple or complex buffer
schemes. Each channel and direction in the dual-buffer scheme has two active buffers.
The CD2481 can be programmed to interrupt the host at the completion of a frame or buffer. In
applications where buffers are of a small, fixed size, the dual-buffer scheme allows large frames
to be divided into multiple buffers.
For applications where a DMA interface is not desired, the device can be operated as either
interrupt-driven or polled. This choice is available for each channel and each direction. For
example, a channel can be programmed for DMA transmit and interrupt-driven receive. In either
case, 16-byte FIFOs on each channel and in each direction reduce latency time requirements,
making both software and hardware designs less time-critical. Threshold levels on the FIFOs are
user-programmable.
Vectored interrupts are another way the CD2481 helps system efficiency. Separate interrupts are
generated for transmit, receive, and modem-signal/timer changes with unique, user-defined
vectors for each type and channel. This allows very flexible interfacing and fast, efficient
interrupt coding. For example, the Good Datainterrupt allows the host to vector directly to a
routine that transfers the receive data — no status or error checking is required.
As of May 2001, this document replaces the Basis Communications Corp.
document CL-CD2481 — Programmable Four-Channel Communications Controller.
May 2001




Intel

CD2481 Datasheet Preview

CD2481 Datasheet

Programmable 4-Channel Communications Controller

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Information in this document is provided in connection with Intel® products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
The CD2481 may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current
characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by calling 1-800-
548-4725 or by visiting Intel’s website at http://www.intel.com.
Copyright © Intel Corporation, 2001
*Third-party brands and names are the property of their respective owners.
Datasheet


Part Number CD2481
Description Programmable 4-Channel Communications Controller
Maker Intel
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