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

Guojian (F) guojian111 at hisilicon.com
Wed Aug 24 19:34:40 PDT 2016



发件人: Guojian (F)
发送时间: 2016年8月25日 9:51
收件人: 't10 at t10.org'
抄送: Guojian (F)
主题: Question about TTIU detection. // What should the PTT state machines jump if it detects a differential high signal level for less than 12 UIs in PTT_PL3 state



发件人: Guojian (F)
发送时间: 2016年8月23日 11:27
收件人: t10 at t10.org<mailto:t10 at t10.org>
主题: What should the PTT state machines jump if it detects a differential high signal level for less than 12 UIs in PTT_PL3 state

Hi,
About the detection of pattern marker, SAS protocol describe the valid and invalid rule of detection as follows:

If the SAS dword mode is enabled, then during the Train_Tx-SNW if the phy’s receiver detects:
1) a differential high signal level for greater than or equal to 19 UIs less than or equal to 24 UIs; and
2) a differential low signal level for greater than or equal to 19 UIs less than or equal to 21 UIs,
then the phy's receiver shall consider the pattern marker to be valid (see figure 78).
If the SAS dword mode is enabled, then during the Train_Tx-SNW if the phy’s receiver detects:
a) a differential high signal level for greater than or equal to 13 UIs and less than 19 UIs;
b) a differential high signal level for greater than 24 UIs;
c) a differential low signal level for greater than or equal to 13 UIs and less than 19 UIs; or
d) a differential low signal level for greater than 21 UIs,
then the phy's receiver shall consider the pattern marker to be invalid.


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?

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