CS61884

2

DS485F1

TABLE OF CONTENTS

1. PINOUT - LQFP ........................................................................................................................................ 7

2. PINOUT - FBGA ........................................................................................................................................ 8

3. PIN DESCRIPTIONS ................................................................................................................................. 9

3.1 Power Supplies .................................................................................................................................. 9

3.2 Control .............................................................................................................................................. 10

3.3 Address Inputs/Loopbacks ............................................................................................................... 14

3.4 Cable Select ..................................................................................................................................... 15

3.5 Status ............................................................................................................................................... 15

3.6 Digital Rx/Tx Data I/O ....................................................................................................................... 16

3.7 Analog RX/TX Data I/O .................................................................................................................... 19

3.8 JTAG Test Interface ......................................................................................................................... 21

3.9 Miscellaneous ................................................................................................................................... 21

4. OPERATION ........................................................................................................................................... 22

5. POWER-UP ............................................................................................................................................. 22

6. MASTER CLOCK .................................................................................................................................... 22

7. G.772 MONITORING ............................................................................................................................... 22

8. BUILDING INTEGRATED TIMING SYSTEMS (BITS) CLOCK MODE .................................................. 23

9. TRANSMITTER ....................................................................................................................................... 24

9.1 Bipolar Mode .................................................................................................................................... 25

9.2 Unipolar Mode .................................................................................................................................. 25

9.3 RZ Mode ........................................................................................................................................... 25

9.4 Transmitter Powerdown / High-Z ...................................................................................................... 25

9.5 Transmit All Ones (TAOS) ................................................................................................................ 25

9.6 Automatic TAOS ............................................................................................................................... 26

9.7 Driver Failure Monitor ....................................................................................................................... 26

9.8 Driver Short Circuit Protection .......................................................................................................... 26

10. RECEIVER ............................................................................................................................................ 26

10.1 Bipolar Output Mode ...................................................................................................................... 26

10.2 Unipolar Output Mode .................................................................................................................... 26

10.3 RZ Output Mode ............................................................................................................................. 27

10.4 Receiver Powerdown/High-Z .......................................................................................................... 27

Contacting Cirrus Logic Support

Visit the Cirrus Logic web site at:

http://www.cirrus.com

IMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject

to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant

information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale

supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus

for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third

parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,

copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-

sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent

does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-

ERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE

IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DE-

VICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDER-

STOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED,

INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT

THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL

APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND

OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION

WITH THESE USES.

Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks

or service marks of their respective owners.