? copyright cirrus logic, inc. 2003 mar ?03 (all rights reserved) er508b1 1 ep73xx rev c devices errata pertains to the ep7312, ep7311, and EP7309 devices www.cirrus.com lcd frame buffer (all ep73xx devices) the lcd frame buffer memory is part of a dma process of transferring data from an external memory source to the lcd controller internal buffer memory. this dma process to the internal lcd frame buffer is 32 bit only. all external memory devices used to store lc d information fo r dma must be in a x32 configu ration. workaround for smaller lcd panels, 320x240x4bpp, all lcd content will fit inside the internal 48kb sram, which is configured as x32. all external ram/sdram devices must obse rve a x32 c onfigu ration. spi2 (all ep73xx devices) spi2 timing diagrams as shown in the ep7312 data sheet are consistent wi th the operation of the spi2 periphe ral. this spi2 port will not work for most master slave d evices. for a typical device, the transmit data bit is shifted out on the rising edge of clock. receive bits are sampled on the same rising edge of sclk. workaround an external d-flip/flop would be needed on ssitxda pin to clock data out only on the fa lling edge of sclk. this will re-align the data for other external devices using ssi2 for master/slave communication. data to transmit will need to be shifted up by one bit before being sent to the ssi2 fifo, to prevent loss of the lsb at the rece iving end. ssitxfr will de-assert before the lsb ca n be clocked out in this configuration. i2s (dai peripheral- ep7312 and EP7309 only) for receiving data, 64fs and 128fs m odes do not sam ple data i mmedi ately after the fall ing/rising edge of lrclk and the assertion of sclk. 1. dai 64fs mode: data sampling is delayed by 1/2 of 1 sclk after lrclk and sclk assert. 2. dai 128f mode: data sampling is delayed 3/4 of 1 sclk delay after lrclk and sclk assert. workaround software: configure the adc for i2s mode. i2s mode w ill delay data by one sclk for each sample. configure the dai for 64fs mode to receiv e data. clock edges to data va lid will align properly.
2 ? copyright cirrus logic, inc. 2003 er508b1 (all rights reserved) ep7312, ep7311, and EP7309 devices contacting cirrus logic support for all product questions and inquiries contact a cirrus logic sales r epresentative. to find one nearest you go to www.cirrus.com important notice cirrus logic, inc. and its subs idiaries ("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 ob t ain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold s ubject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infri ngement, and limita tion of liability. no res ponsibility 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, cir rus 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 consent for copies to be made of the information only for use within your or ganization with respect to cirrus integrated c ircuits or other parts of cirrus. this consent does not extend to other copying such as copying for general distribution, adver tising or promotional purposes, or for creating any work for resale. an export permit needs to be obtained from the competent authorities of the japanese government if any of the products or techn ologies described in this material and controlled under the "foreign exchange and foreign trade law" is to be exported or taken out of ja pan. an export license and/or quota needs to be obtained from the competent authorities of the chinese government if any of the products or technologies described in this material is s ubject to the prc foreign trade law and is to be exported or taken out of the prc. 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 applicatio ns, products s urgically implanted into the body, life support pro ducts or other critical applications (including medical devices, aircraft systems or components and pe rsonal or auto motive safety or security devices). inclusion of cirrus products in such applications is understood 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 ci rrus product that is used in such a manne r. if the customer or customer?s customer uses or perm its the use of cirrus pro ducts in critical applicati ons, customer agrees, by such use, to fully indemnify cirrus, its officers, directors, employees, dist ributors and other agents from any and all liability, includ- ing attorneys? fees and costs, that may result from or arise in connection with t hese 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.
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