Disposition of short or long SSP frames in SAS
steve.finch at st.com
Thu Apr 10 07:40:59 PDT 2008
* From the T10 Reflector (t10 at t10.org), posted by:
* Stephen FINCH <steve.finch at st.com>
Ah, but the standard is clear! In section:
"188.8.131.52 SSP_RF (receive frame control) state machine"
"This state shall discard the frame if:
a) this state receives more than 263 Data Dword Received messages after an
SOF Received message and before an EOF Received message;
b) this state receives fewer than 7 Data Dword Received messages after an
SOF Received message and before an EOF Received message,
c) this state receives an Rx Credit Status (Credit Exhausted) message; or
d) this state receives a DONE Received message."
And later it states that an ACK or NAK is sent only if the frame is not
Therefore, an ACK or NAK is not sent for a frame of invalid size.
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of
Gary.Franco at emulex.com
Sent: Thursday, April 10, 2008 4:05 AM
To: t10 at t10.org
Subject: Disposition of short or long SSP frames in SAS
During SSP frame reception if the frame was either too short (less than 6
DWORDS) too long (greater than 262 DWORDS) and the CRC was good, should a
NAK be generated for the frame?
I cannot find anything about this in the SAS 2.0 Rev 14 spec
Gary Franco Consultant Engineer
Emulex Network Systems
972-671-7433 Dallas Office
972-671-7435 Dallas Office Fax
720-652-6387 Longmont Colorado Office
720-494-1817 Longmont Colorado Office Fax
972-839-5694 Cell Phone
Middle age is when you have a choice of two temptations and choose the one
that will get you home earlier.
* For T10 Reflector information, send a message with
* 'info t10' (no quotes) in the message body to majordomo at t10.org
More information about the T10