Fujitsu MBA3300RC, MBC2036RC, MBC2073RC, MBA3147RC, MBA3073RC specifications Connections

SAS Interface

1.1.6 Connections

A connection is a temporary association between a SAS INIT port and a SAS TARG port. During a connection all dwords from the SAS INIT port are forwarded to the SAS TARG port, and all dwords from the SAS TARG port are forwarded to the SAS INIT port.

A connection is pending when an OPEN address frame has been delivered along a completed pathway to the destination phy but the destination phy has not yet responded to the connection request. A connection is established when an OPEN_ACCEPT is returned to the source phy.

A connection enables communication for one protocol: SSP, STP, or SMP. For SSP and STP, connections may be opened and closed multiple times during the processing of a command.

The connection rate is the effective rate of dwords through the pathway between a SAS INIT phy and a SAS TARG phy, established through the connection request. Every phy shall support a 1,5 Gbps connection rate regardless of its physical link rate.

One connection may be active on a physical link at a time. If the connection is an SSP or SMP connection and there are no dwords to transmit associated with that connection, idle dwords are transmitted.

The number of connections established by a SAS port shall not exceed the number of SAS phys within the SAS port (i.e., only one connection per SAS phy is allowed). There shall be a separate connection on each physical link.

If multiple potential pathways exist between the SAS INIT port(s) and the SAS TARG port(s), multiple connections may be established by a SAS port between the following:

a)one SAS INIT port to multiple SAS TARG ports;

b)one SAS TARG port to multiple SAS INIT ports; or

c)one SAS INIT port to one SAS TARG port.

Once a connection is established, the pathway used for that connection shall not be changed (i.e., all the physical links that make up the pathway remain dedicated to the connection until it is closed).

28 C141-C013