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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.  CJTPAT versus JTPAT
Should we stick with CJTPAT as the required pattern and not allow JTPAT as an equivalent?
Discussion leaned toward CJTPAT being a more stringent test since it includes a wider spectral content.
Question to all:
Do the header and CRC need to be valid? If these are generated by a tester that just makes up fake data, is that acceptable for the test?

2. Review of Annex B since de-embedding has a significant impact at 6Gbps.

3. JTF
We accepted the concept but have not discussed the implementation. No responses have been voiced concerning the Synthesis Research proposal to help close the measurement accuracy.

Does the use of this filtering give an equivalant value to using the single pole f/1667 if SSC is not applied? This question is in regards to the text in the eye diagram section. I have been reviewing how to incorporate 6G and think it may be best to integrate rather than make a totally new section.

Test equipment question:
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).

4.  SAS-2 6Gbps PHY Electrical Specification
Rev 8 to be posted late 6/20 to just before the call. Will have text from SAS-2 r10 with comments concerning incorporation of 6G in several areas.

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