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Topic: SAS-2 PHY WG
Date: Thursday
Time: 10:00 am, Central Daylight Time (GMT -05:00, Chicago)
Meeting number: 826 515 680
Meeting password: 6gbpsSAS


Agenda:

1. StatEye simulations status:
Harvey, Kevin, Mike
SAS-2 Channel StatEye Simulation Results (07-253) [Witt]
http://www.t10.org/ftp/t10/document.07/07-253r0.pdf

2. SAS-2: Improving a Jitter Definition (07-205)
http://www.t10.org/ftp/t10/document.07/07-205r0.pdf
Feedback is needed from other measurement equipment suppliers regarding the comments below.

Comments from Bent Hessen-Schmidt, SyntheSys Research, Inc.:

I suggest that we use text equivalent to:
 
The Reference Clock characteristics are controlled by the resulting JTF (Jitter Transfer Function) characteristics obtained by taking the time difference between the PLL output (the Reference Clock) and the data stream sourced to the PLL. The PLL CLTF -3 dB corner frequency, and other adjustable CLTF parameters such a peaking, are determined by the value required to meet the requirements of the JTF.
The JTF shall have the following characteristics for an encoded D24.3 pattern (1100110011 0011001100). This is the MFTP which is a test pattern that has clock-like characteristics and a transition density of 0.5.
1) The -3 dB corner frequency of the JTF shall be 3 MHz +/-1 MHz.
2) The magnitude peaking of the JTF shall be 3.5 dB maximum.
3) The attenuation at 30 KHz +/-1% shall be 75 dB +/-3 dB.
The JTF -3dB corner frequency and the magnitude peaking requirements shall be measured with sinusoidal PJ applied, with a peak-to-peak amplitude of 0.3 UI +/-10%. The relative attenuation at 30 KHz shall be measured with sinusoidal phase (time) modulation applied, with a peak-to-peak amplitude of 20.8 ns +/-10%.
 
You will see that we have changed to from 72 db to 75 dB and from 2.1 MHz to 3 MHz and added the word “relative” to the last sentence. Relative should indicate that the 75 dB are with respect to the actual magnitude of jitter on the 30 kHz stimulus. The +/-10% therefore merely sets the starting point and still allows the other vendor. All uncertainties are then included in the +/-3 dB term. Effective tightening of the tolerances can be seen on the residual of the 30 kHz being confined to less than 5.2 ps instead of (7.4 x 1.1 x 1.1 ps = 8.95 ps).

3.  10-meter cable specification (06-499r2)
Time domain versus frequency domain concerns.

4.  Zero-length test load  (07-013)
Update?

5.  Additional items and updates.



Alvin Cox
Seagate Technology, LLC
Office 405-381-8067
Cell 405-206-4809
E-Mail  alvin.cox@seagate.com