[SI-LIST] Re: The maximum length of a bus?

Hi Cheng

I think it will be useful to simulate by means of hspice and to have a look at 
the s-para. Comparing the s-para with frequency domain of the signal will tell 
the length of transmission line.

Best Regards
Zhangkun
2002.10.28
----- Original Message ----- 
From: C.Y. Cheng <cycheng@xxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Monday, October 28, 2002 9:14 AM
Subject: [SI-LIST] The maximum length of a bus?


> Good day gurus,
> 
> I have been asked a question,"What is the maximum length of RGMII interface 
> that your chip can drive?"  We know that RGMII interface is a chip to chip 
> bus, all the data synchronous to the clock of the driver. Rise time of clock 
> is 0.75ns(20%-80%). Both edges of the reference clocks drives data at 125MHz. 
> Maximum length specified in the specification is 6 inches, but in some 
> application cases bus length would be more than 6 inches.
> 
> How do I model/analysis the bus to find the answer?
> 
> Regards,
> 
> 
> C.Y. Cheng
> System design Engineer 
> Realtek Semiconductor Inc.
>  
> 
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