[SI-LIST] Re: Ghz/Gbs convert
- From: Patrick_Carrier@xxxxxxxx
- To: jooonguyen@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 20 Jun 2002 18:43:48 -0500
Hey Joe--
That's a tricky one.
It all depends on what kind of bus you are running.
U320 SCSI, for instance, runs at 80 MHz, yet they call it U320 because it
throughputs 320MB/s. The 80MHz clock is double-edge triggered giving you
160 Mb/s on each line, and since the bus is 2 BYTES (16 bits) wide, you get
320 MegaBYTES per second.
For most GHz-range serial busses, I believe your throughput will be twice
the fundamental frequency. So if your max toggle rate is 1 GHz, that
assumes a 101010 sequence of bits each 500ps wide, or 2Gb/s.
So, to answer your question, take your Gb/s and divide by two to get your
actual GHz number for running a pulse train in a simulation.
So, GHz = Gbs/2
Also, make sure you know what is being taken into account as far as overhead
for the bus. For instance, 2 Gigabit FibreChannel actually runs at 2.125
Gb/s, or a fundamental frequency of 1.0625 GHz.
--Pat
-----Original Message-----
From: joe nguyen [mailto:jooonguyen@xxxxxxxxxxx]
Sent: Thursday, June 20, 2002 3:27 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ghz/Gbs convert
Dear Si Expert,
Just a silly question. How would you convert Ghz to Gbs? What is the rule
of thumb?
Thank you in advance,
JOe
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