[T10] What should the PTT state machines jump if it detects a differential high signal level for less than 12 UIs in PTT_PL3 state

Tim Symons tim.symons at microsemi.com
Tue Sep 20 15:36:35 PDT 2016


Guojian,

Sorry for delayed response,

While in PPT_PL3, if a PHY detects a pattern marker  that has a high signal that is 12UI's or less then this will probably mean that the low signal will be 28UI or more. This is clearly an invalid pattern marker (see spl4r10 Figure 77) and so there will be a transition from PTT_PL3 to PTT_PL4 as described in 5.18.12.5.2.
5.18.12.5.2 Transition PTT_PL3:Lock_Acquired to PTT_PL4:Lost1
This transition shall occur:

a) after receiving an Invalid Pattern Marker message.

Regards
Tim Symons

(SPL editor)

-------- Forwarded Message --------
Subject:

[T10] What should the PTT state machines jump if it detects a differential high signal level for less than 12 UIs in PTT_PL3 state

Date:

Tue, 23 Aug 2016 03:26:50 +0000

From:

Guojian (F) <guojian111 at hisilicon.com><mailto:guojian111 at hisilicon.com>

To:

t10 at t10.org<mailto:t10 at t10.org> <t10 at t10.org><mailto:t10 at t10.org>



Hi,
About the detection of pattern marker, SAS protocol describe the valid and invalid rule of detection as follows:
[cid:image003.jpg at 01D21354.31CF8570]

What should the PTT state machines jump if it detects a differential high signal level for less than 12 UIs in PTT_PL3 state.
Consider it to be invalid and jump to PTT_PL4 state? Or ignore it, stay in PTT_PL3 and start a new detection?
[cid:image005.jpg at 01D21354.31CF8570]
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