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trenz-al
Scholar
Scholar
9,078 Views
Registered: ‎11-09-2013

ZU+ PS GTR SATA reference clock

UG1085 clearly says that only reference clock option for SATA is 150MHz.

 

All settings for the REF clocks for ZCU102 define SATA ref clock to be either 100 or 27MHz ? both seem tobe incorrect

 

PCW does not validate those clock, so it is really hard to say what the required clocks are, so question:

 

Does ZU+ PS SATA Ref need to be 150MHz as UG1085 says? or can be 100MHz as ZCU102 is using or?

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venkata
Moderator
Moderator
8,289 Views
Registered: ‎02-16-2010

UG1085 should be correct.

The link layer can work at SATA generation 1 (1.5 Gb/s), generation 2 (3.0 Gb/s) and
generation 3 (6.0 Gb/s) speeds. For 1.5 Gb/s operation it must be clocked with a 37.5 MHz
clock derived from the receive side of the SATA PHY, for 3.0 Gb/s operation it is clocked with
a similarly derived 75 MHz clock and for 6.0 Gb/s operation, this becomes 150 MHz.
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