Fujitsu MBC2073RC Primitive sequences, Primitives not specific to type of connections, Align

1.4 Link layer

1.4.2 Primitive sequences

Table 1.12 summarizes the types of primitive sequences.

Table 1.12 Primitive sequences

Primitive	Number of times the transmitter	Number of times the receiver
	transmits the primitive to transmit	receives the primitive to detect the
sequence type
	the primitive sequence	primitive sequence
Single	1	1
Triple	3	3
Redundant	6	3

Any number of ALIGNs and NOTIFYs may be sent inside primitive sequences without affecting the count or breaking the consecutiveness requirements. Rate matching ALIGNs and NOTIFYs shall be sent inside primitive sequences inside of connections if rate matching is enabled.

1.4.3 Primitives not specific to type of connections

1.4.3.1AIP (Arbitration in progress)

AIP is sent by an expander device after a connection request to specify that the connection request is being processed and specify the status of the connection request.

A drive performs the following processing when an AIP primitive is received:

1)When the drive receives an AIP primitive after sending the OPEN frame, the drive initializes the open timer held in the drive, and restarts it.

2)When the drive receives an AIP primitive before sending the OPEN frame, the received AIP primitive is discarded.

3)In a case of OPEN cross (a case where both the drive and initiator send the OPEN frame), when the drive receives an AIP primitive after sending the OPEN frame and, then, receives the OPEN frame from the expander, the drive does not perform the arbitration fairness procedure. Instead, the attempt from the drive is treated as unsuccessful, and the drive sends the OPEN_ACCEPT or an OPEN_REJECT primitive.

1.4.3.2ALIGN

ALIGNs are used for:

a)OOB signals;

b)character and dword alignment during the speed negotiation sequence;

c)clock skew management after the phy reset sequence;

d)rate matching during connections; and

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