How to desgin a backplane from SAS controller to SATA drive?

Thread Starter

Enshuo

Joined Jul 15, 2020
7
Hi experts,
I study a SAS 9305 HBA card through a backplane to SATA HDD, how to design the backplane correctly?

The left side is miniSAS HD connector, and the right side is SAS connector, but it's for SATA HDD.


1599236064709.png





I checked the pinout SAS and SATA is the opposite. Since 9305 HBA is SAS controller, should I follow SAS pinout? or stick to SATA pinout.
For example, SATA0_TX_DP/N from miniSAS HD should connect to S6/S7 or S2/S3 for SATA HDD, or it doesn't matter. Perhaps, SAS can automatically reverse like PCIE.

Furthermore, the 29 pins SAS connector of BP should be compatible with SATA HDD, right?
SAS (SFF-8482)
1599236105639.png

SATA
1599235660513.png
 

nsaspook

Joined Aug 27, 2009
7,587
I've used SATA drives in a SAS drive backplane so they are compatible. (In the HP server series) The reverse is not true. Just use the same physical size drive in the correct drive carrier.
 

Thread Starter

Enshuo

Joined Jul 15, 2020
7
I found Pin 2/3 is TX at the host side, so it should be RX at the drive side. I guess SAS (SFF-8482) uses for cable (TX -> RX) mostly, so it's defined at the drive side.
1599448586153.png
 

Attachments

Top