1. Joshua Beaudet & Michael Klempa
UNH-IOL SAS Test Tool
Joshua Beaudet & Michael Klempa

2. Project Goals
Create a tool using an FPGA for the UNH-IOL that connects to a SAS device
Make it versatile for future testing

3. Practical Uses
Testing a SAS drive or host’s state machines (SN, OOB, etc.)
Golden Reference device

4. Design Inspiration

5. LeCroy Sierra M6-2 Advantages Disadvantages Established Software GUI
Analyzer built in
Disadvantages
Crashes frequently
Returns false data

6. Virtex 6

7. Virtex 6 Advantages Disadvantages Speed capabilities Robustness
Versatility
Abundant References
Disadvantages
Highly Complex infrastructure
Fragile
Unfamiliarity

8. Setup

9. Why VHDL?
Robustness
IEEE Standard
Ubiquitous

10. SAS Referencing SAS 2.1 Rev. 7 Specification Serial Attached SCSI
Enterprise Level Storage Technology
8b/10b encoding, differential NRZ signaling
Focus: Establishing Link between two devices

11. OOB
Definition:
Out of band (OOB) signals are low-speed signal patterns that do not appear in normal data streams. OOB signals consist of defined amounts of idle time followed by defined amounts of burst time

12. OOB State Machine

13. OOB Demo

14. COMINIT & COMSAS COMINIT begins the OOB sequence
COMSAS is used to show that the device is a SAS device

15. Speed Negotiation
Goal: Find a commonly supported speed between two link partners
Covers 6, 3, and 1.5G SAS
Series of “Windows”

16. Speed Negotiation State Machine

17. Budget Item Cost Actual From Virtex 6 FPGA $5,000 $0 Xilinx SAS Drive
$300
UNH IOL

18. Project Schedule

19. Questions?