[SI-LIST] Re: Bit pattern for high speed serial link simulation
- From: steve weir <weirsi@xxxxxxxxxx>
- To: perry.qu@xxxxxxxxxxx, "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 28 Nov 2005 13:25:47 -0800
Perry, if you are bypassing the encoder/decoder, then PRBS7 generates
sufficient run-length. If you are driving the encoder, you want a run
length > 15, so PRBS21 or PRBS31 would be a better choice.
Steve.
At 03:21 PM 11/28/2005 -0500, Perry Qu wrote:
>Hi,
>
>What will be a realistic bit pattern to use for simulation of a serial link
>(3Gbps) with 8B/10B encoding ? Right now I used PRBS7 pattern but I'm not
>sure whether it captured the worst case pattern compared to reality, where
>the live data traffic is a lot more random. 8B/10B has a run length of 5 but
>if it's fed with say a PRBS31 bit stream, will I get more spectrum peaks
>than just a pure PRBS7 pattern without encoding which repeat itself every
>127 bits ?
>
>Thanks
>
>Perry
>
>=======================================
>
>Perry Qu
>
>Design & Qualification, Alcatel Canada
>
>600 March Road, Ottawa ON, K2K 2E6
>
>DID: 613-7846720 Fax: 613-5993642
>
>Email: perry.qu@xxxxxxxxxxx
>
>=======================================
>
>
>
>
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