SAS Drive - Presence detect
wcgintz at ix.netcom.com
Wed Jul 14 17:43:18 PDT 2004
* From the T10 Reflector (t10 at t10.org), posted by:
* William Gintz <wcgintz at ix.netcom.com>
Depends on which drive ground you use; For example, use of any ground =
adjacent to serial data pin could have significant Signal Integrity
and/or EMI consequences.There are also other potential dc path =
possibly altering hot plugging and transmission line transients.
Necessary bypassing and impedance control solutions are non trivial.=20
Subsequent confirmation of functionality, noise margin very desirable.
Some "home work" to be done on the drive side circuit paths.
At 03:28 PM 7/13/2004, Kevin Khuu wrote:
>* From the T10 Reflector (t10 at t10.org), posted by:
>* "Kevin Khuu" <kevin98146 at hotmail.com>
>Is there anything wrong with using one of the GND pins on the SAS hard =
>drive connector as presence detect?
>On the SAS hard drive backplane, I have this presence detect signal =
>up to VDD. When I plugged in a SAS hard drive, the GND pin on the =
>drive would pull this signal low.
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