Removal of a two_dword phy test pattern example from SPL

Penokie, George George.Penokie at lsi.com
Wed Jun 9 09:58:49 PDT 2010


Formatted message: <a href="http://www.t10.org/cgi-bin/ac.pl?t=r&f=r1006090_f.htm">HTML-formatted message</a>
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I have received the following letter ballot on SPL. Unless someone objects I
plan on accepting it.
Delete this pattern from the list.  Although SAS-1.1 specified using that
pattern for external cable assembly DJ testing, SAS-2 no longer does so.
Table 190 - TWO_DWORDS phy test pattern examples
[cid:image002.png at 01CB07CB.1F493CC0]
The main reason for deleting this is because getting a lone-bit pattern
depends on the disparity:
Given:
D11.7 = EBh
-110100 1110
+110100 1000
D20.7 = F4h
-001011 0111
+001011 0001
EBF4EBF4h only provides lone-bits for + starting disparity:
(+110100 1000 -001011 0111) (+110100 1000 -001011 0111)
		 ^lone-bit	 ^lone-bit
and none for - starting disparity:
(-110100 1110 +001011 0001) (-110100 1110 +001011 0001)
      (no lone-bits)
The F4EBF4EBh order is needed to provide lone-bits for - starting disparity:
(-001011 0111 +110100 1000) (-001011 0111 +110100 1000)
		  ^lone-bit	^lone-bit
but yields none for - starting disparity:
(+001011 0001 -110100 1110) (+001011 0001 -110100 1110)
      (no lone-bits)
Bye for now,
George Penokie
LSI Corporation
3033 41st St. NW
Suite 100
Rochester, MN 55901
507-328-9017
george.penokie at lsi.com



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