Fujitsu MBC2073RC SSP link layer, Rate matching Align and/or Notify insertion requirements

SAS Interface

Table 1.30 Rate matching ALIGN and/or NOTIFY insertion requirements

Physical	Connection	Requirement
link rate	rate
1,5 Gbps	1,5 Gbps	None
		One ALIGN or NOTIFY within every 2 dwords that are not
3,0 Gbps	1,5 Gbps	clock skew management ALIGNs or NOTIFYs (i.e., every
		overlapping window of 2 dwords)
	3,0 Gbps	None

A phy shall start inserting ALIGNs and/or NOTIFYs for rate matching at the selected connection rate with the first dword that is not an ALIGN or NOTIFY inserted for clock skew management following:

a)transmitting the EOAF for an OPEN address frame; or

b)transmitting an OPEN_ACCEPT.

The source phy transmits idle dwords including ALIGNs and NOTIFYs at the selected connection rate while waiting for the connection response. This enables each expander device to start forwarding dwords from the source phy to the destination phy after forwarding an OPEN_ACCEPT.

A phy shall stop inserting ALIGNs and/or NOTIFYs for rate matching after:

a)transmitting the first dword in a CLOSE;

b)transmitting the first dword in a BREAK;

c)receiving an OPEN_REJECT for a connection request; or

d)losing arbitration to a received OPEN address frame.

1.5.6 SSP link layer

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.

SSP is a full duplex protocol. An SSP phy may receive an SSP frame or primitive in a connection while it is transmitting an SSP frame or primitive in the same connection. A wide SSP port may send and/or receive SSP frames or primitives concurrently on different connections (i.e., on different phys).

When a connection is open and an SSP phy has no more SSP frames to transmit on that connection, it transmits a DONE to start closing the connection. The other direction may still be active, so the DONE may be followed by one or more of the following primitives: CREDIT_BLOCKED, RRDY, ACK, or NAK.

72 C141-C013