Hitachi HUS154530VLF400 User Manual

  

 Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

100

The drive uses FCAL timers as specified in PLDA 2.1 as required in the standard. 

 

AL_TIME represents two times the worst case round trip latency for a very large loop. 

 

LIS_HOLD_TIME is the maximum amount of time between when a node receives a Loop Initialization Sequence 
until it forwards it to the next node. 

 

R_T_TOV is used by the receiver logic to detect a Link Failure. A Link Failure is defined as loss of synchronization 
for a period greater than R_T_TOV. 

 

E_D_TOV is the minimum time a port shall wait for the next expected frame in a sequence before detecting an error.

R_A_TOV is defined by the PLDA to be two distinct timers. 

SEQ_QUAL

 defines the minimum time a port shall wait before reuse of the sequence qualifiers SEQ_CNT  

and SEQ_ID. The PLDA defines the value of R_A_TOV

SEQ_QUAL

 to be zero seconds.

Twice the value of R_A_TOV

ELS

 defines the minimum time a port shall wait for the response to an Extended Link 

Service Request. The PLDA defines this value to be two seconds. Therefore a port must wait twice this value (four 
seconds) before timing out an ELS.

In the FLA, there is no split definition of the R_A_TOV value. One timer value is used for both 

R_A_TOV

SEQ_QUAL

 and R_A_TOV

ELS

.

 

RR_TOV is the minimum time a target shall wait for an Initiator to perform exchange authentication following LIP. If 
this timer expires, the Target will implicitly log out the Initiator and free up the resources associated with that timer. 
An RR_TOV timer is maintained for each Initiator that has logged in. 

Arbitrated Loop Timeout Value 

15 ms 

Loop Initialization Sequence Hold Time 

1 ms 

Receiver Transmitter Timeout Value 

100 ms 

Error Detect Timeout Value

2 sec./2 sec.*

Resource Allocation Timeout Value

2 sec./10 sec.*

Resource Recovery Timeout Value 

2 sec. 

Loop Timeout Value 

2 sec.