[T10] SAS Maximum SSC frequency deviation

Kevin D Butt kdbutt at us.ibm.com
Wed Apr 13 14:53:16 PDT 2016

I have a question about Maximum SSC frequency deviation (SSCtol) listed in 
Table 73 of SAS-4r05. For 12 Gbit/s the table lists a maximum of -1000 

In searching for available clock generators capable of SSC, all parts we 
find provide a minimum of 0.5% spread. By our calculations from the 
standard for -1000 ppm would be equal to -0.1%. Are we misinterpreting the 


Kevin D. Butt
SCSI Architect, Tape Firmware, CAMSS
T10 Standards
MS 6TYA, 9000 S. Rita Rd., Tucson, AZ 85744
Tel: 520-799-5280
Fax: 520-799-2723 (T/L:321)
Email address: kdbutt at us.ibm.com

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