hi all: is there sombody know where can i get the scrambler/descrambler code?now i am developing sata ip core ,but i found the speed of the scrambler/descrambler is difficult to solve,somebody can help me??thanks! ========================================================AOC请您看奥运-2004年雅典奥运会AOC助威团　http://design.163.com/aocmonitor/index.html 真情回馈 超值优惠 VIP邮箱买一送四 买三送十二！ http://vip.163.com 中国最大的免费邮箱在等你 25兆空间4兆附件！　　　　　 http://mail.163.com 点击网易泡泡惊喜无限 全免费手机短信任你发!　　　　 http://popo.163.com

Maybe you could explain the speed problem. Are you trying to run your scrambler serial or byte wide? You can take any scrambler and make it run several bits at a time(or more, I've seen 300+ bit wide scramblers in 40Gbps fiber chips). Is this what you want to know? I can explain how to do it. -Brian -----Original Message----- From: cores-bounces at opencores.org on behalf of ??? Sent: Wed 6/2/2004 8:42 PM To: cores at opencores.org Cc: Subject: [oc] scrambler/descrambler hi all: is there sombody know where can i get the scrambler/descrambler code?now i am developing sata ip core ,but i found the speed of the scrambler/descrambler is difficult to solve,somebody can help me??thanks! ========================================================AOC?????-2004??????AOC??? http://design.163.com/aocmonitor/index.html ???? ???? VIP?????? ?????! http://vip.163.com ???????????? 25???4???! http://mail.163.com ?????????? ??????????! http://popo.163.com _______________________________________________ http://www.opencores.org/mailman/listinfo/cores -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/ms-tnef Size: 2823 bytes Desc: not available Url : http://www.opencores.org/forums.cgi/cores/attachments/20040603/5e505c01/attachment.bin

Hi,

I was wondering if somebody can let me know how the De-Scrambler can synchronize to the scrambler.
This question might be a bit stupid. But I missed somehow this point.

The scrambler that I see usually behave like a polynomial division.
The input data stream gets divided by the divisor polynome.
The receiver side must then multiply the received stream by the same value.
But then again, I don't know where the stream started .... This De-Scrambler looks very magic to me. Does anybody have an easy explanation for dumies ??

Best regards

Georg P. Israel

This is a very good question - not stupid at all. I do not know the answer for this Core, but generally a serial stream will have some sort of code that is not ever supposed to appear in the scrambled stream, and that is used to signal the start. MPEG is a bit-stream, and uses a start code that may not always appear on a byte boundary.

I cannot tell which scrambler is being referred to in this thread, but there is mention of SATA. If that is the scrambler that you want to understand, then I suggest obtaining the specifications for SATA so you can study them. Synchronization will surely be described in the official specification.