28500-pbd-001-b mindspeed technologies ? 1 mindspeed proprietary and confidential 28500-pbd-001-b october 2006 cx28500 product bulletin products affected: cx2 8500-11p, cx28500-12p this document describes conditions that may cause the op eration of the above device to deviate from published specifications. possible miscalculation of frame check sequence (fcs) in transmit direction when pad count is less than two or pad adjust is enabled description: for channels configured in hdlc fcs-16 or fcs-32 modes, the fcs may be incorrectly calculated in the transmit direction when the pad coun t is less than two, or the pad adjust is enabled. recommended action: 1. use pad count >= 2 and 2. disable pad adjust. pad count is set in the transmitted buffer descriptor (only for the last buffer in a message), in bits 25:18. pad adjust is disabled by clearing bit #2 (tpadj) in the tslp channel configuration register (address 11000h + 4 * channel number). the relative amount of bandwidth left unexploited by using this method is at most 4.44% for 40-byte packets.
? 2006, mindspeed technologies ? , inc. all rights reserved. information in this document is provided in connection with mindspeed technologies ? ("mindspeed ? ") products. these materials are provided by mindspeed as a service to its customers and may be used for informational purposes only. except as provided in mindspeed?s terms and conditions of sale for such products or in any separate agreement related to this document, mindspeed assumes no liability whatso ever. mindspeed assumes no responsibility for errors or omissions in these mate rials. mindspeed may make c hanges to specifications and product descriptions at any time, without notice. mindspeed makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incom patibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" withou t warranty of any kind, either express or implied, relating to sale and/or use of mindspeed products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. mindspeed further does not warrant the accuracy or completeness of the information, text, graph ics or other items contained within these materials. mindspeed shall not be liable fo r any special, indirect, incidental, or consequential damages, including without li mitation, lost revenues or lost profits, which may result from the use of these materials. mindspeed products are not intended for use in medical, lifesaving or life sustaining applications. mindspeed customers using or selling mindspeed pr oducts for use in such applications do so at their own risk and agree to fully indemnify mindspeed for any damages resulting from such improper use or sale. www.mindspeed.com general information: telephone: (949) 579-3000 headquarters - newport beach 4000 macarthur blvd., east tower newport beach, ca 92660 28500-pbd-001-b mindspeed technologies ? mindspeed proprietary and confidential cx28500 product bulletin
|
