Fujitsu MBA3300RC, MBC2036RC, MBC2073RC, MBA3147RC Bits 79-64 79 is MSB Bits 63-0 0 is LSB

SAS Interface

Each SAS port and expander port shall include an Arbitration Wait Time timer which counts the time from the moment when the port makes a connection request until the request is accepted or rejected. The Arbitration Wait Time timer shall count in microseconds from 0 μs to 32 767 μs and in milliseconds from 32 768 μs to 32 767 ms + 32 768 μs. The Arbitration Wait Time timer shall stop incrementing when its value reaches 32 767 ms + 32 768 μs.

SAS ports (i.e., SAS INIT ports and SAS TARG ports) shall start the Arbitration Wait Time timer when they transmit the first OPEN address frame for the connection request. When the SAS port retransmits the OPEN address frame (e.g., after losing arbitration and handling an inbound OPEN address frame), it shall set the ARBITRATION WAIT TIME field to the current value of the Arbitration Wait Time timer.

SAS ports should set the Arbitration Wait Time timer to zero when they transmit the first OPEN address frame for the connection request. A SAS INIT port or SAS TARG port may be unfair by setting the ARBITRATION WAIT TIME field in the OPEN address frame to a higher value than its Arbitration Wait Time timer indicates. However, unfair SAS ports shall not set the ARBITRATION WAIT TIME field to a value greater than or equal to 8000h; this limits the amount of unfairness and helps prevent livelocks.

The expander port that receives an OPEN address frame shall set the Arbitration Wait Time timer to the value of the incoming ARBITRATION WAIT TIME field and start the Arbitration Wait Time timer as it arbitrates for internal access to the outgoing expander port. When the expander device transmits the OPEN address frame out another expander port, it shall set the outgoing ARBITRATION WAIT TIME field to the current value of the Arbitration Wait Time timer maintained by the incoming expander port.

A port shall stop the Arbitration Wait Time timer and set it to zero when it wins arbitration (i.e., it receives either OPEN_ACCEPT or OPEN_REJECT from the destination SAS port rather than from an intermediate expander device). If a port receives a connection request that satisfies its arbitration request (i.e., it receives an OPEN address frame from the destination SAS port with the INITIATOR PORT bit set to the opposite value and a matching PROTOCOL field), it shall stop the Arbitration Wait Time timer unless it accepts the request (i.e., transmits an OPEN_ACCEPT rather than an OPEN_REJECT).

If two connection requests pass on a physical link, the phy shall determine the winner by comparing OPEN address frame field contents using the arbitration priority described in Table 1.26.

Table 1.26 Arbitration priority for OPEN address frames passing on a physical link

Bits 79-64 (79 is MSB)	Bits 63-0 (0 is LSB)
ARBITRATION WAIT	SOURCE SAS ADDRESS
TIME field value	field value

68 C141-C013