To: monika.talwar@nsysinc.com Cc: owner-t10@t10.org, t10@t10.org Subject: Re: Identify Frame and RRDY transmission. From: George Penokie <gop@us.ibm.com> Date: Thu, 14 Dec 2006 17:51:51 -0600 X-Message-Number: 7442 Formatted message: HTML-formatted message Mona, 1) The wording in 7.16.1 is not a problem as the there is no OPEN_ACCEPT sent if an RRDY cannot be sent within 1 ms. That's what the statement "and not accept the connection request" means. An SSP phy that accepts an OPEN address frame shall transmit at least one RRDY in that connection within 1 ms of transmitting an OPEN_ACCEPT. If the SSP phy is not able to grant credit, it shall respond with OPEN_REJECT (RETRY) and not accept the connection request. 2) They are approximately the same time, as the point at which the phy reset sequence completes is approximately the same as the point at which the identify message is sent which is all the overview is attempting to accomplish. The precise time at which to start the timer is what is defined in the state machine description. Bye for now, George Penokie Dept 9A8 030-3 A410 E-Mail: gop@us.ibm.com Internal: 553-5208 External: 507-253-5208 Mona <monika.talwar@nsysinc.com> Sent by: owner-t10@t10.org 12/14/2006 01:50 AM Please respond to monika.talwar@nsysinc.com To t10@t10.org cc Subject Identify Frame and RRDY transmission. Hello all, I am referring to sas2r07 version. 1)Please see the section 7.16.1 of the specification. 7.16.1 Opening an SSP connection An SSP phy that accepts an OPEN address frame shall transmit at least one RRDY in that connection within 1 ms of transmitting an OPEN_ACCEPT. If the SSP phy is not able to grant credit, it shall respond with OPEN_REJECT (RETRY) and not accept the connection request. According to this statement, OPEN_REJECT will be transmitted if RRDY can't b transmitted after accepting the connection. It means OPEN_REJECT(RETRY) will be transmitted after OPEN_ACCEPT is transmitted. But as stated in Table 88, OPEN_REJECT is transmitted when there is no connection. Both the statements are in contrary. 2) The last line of section 7.9.1 Identification and hard reset sequence overview states: (A) "If a phy does not receive a HARD_RESET primitive sequence or a valid IDENTIFY address frame within 1 ms of phy reset sequence completion, it shall restart the phy reset sequence." But 3rd para of section 7.9.4.5.3.1 State description states: (B) "After this state receives an Identify Transmitted message, it shall initialize and start the Receive Identify Timeout timer." Does spec. refer to same timer in both the statements. In case they are same (A) asks to start the timer after phy reset sequence is over while (B) asks to start the timer after transmitting the Identify Frame. There will always be overhead or delays related to Identify frame transmission. Which is the correct implementation. Shall the timer be started after Frame is transmitted or after phy reset sequence is over. Please suggest. Thanks & Best regards Mona nSys http://www.nsysinc.com Accelerating designs +1-510-402-4544 ----------------------------------