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User’s Guide 21020285 D
Chapter 7 Board-control Commands
Extended Unit Options (18H) Page 7 - 47
Retry Control
This field is used to particularize the retry operation for this unit. This field
allows you to select the type of errors to retry and how they are reported.
INT Issue Interrupt - When ISB bit is set, allows you to select whether the
adapter posts an interrupt for retry Status Block(s) when returned. Valid only
when ISB is set.
0 ⇒ Do not interrupt for retry Status Block(s).
1 ⇒ Interrupt when retry Status Block(s) returned.
ISB Issue Status Block - Allows you to select that a Status Block be returned
for each command retry performed. Enabling this will cause multiple Status
Blocks to be returned for a command that requires retries.
0 ⇒ Do not issue a Status Block for each retry.
1 ⇒ Issue a Status Block for each retry.
RPE Retry Parity Errors - Allows retries of SCSI commands that failed with
a parity error.
0 ⇒ Do not retry for parity errors.
1 ⇒ Retry parity errors.
RCE Retry Command Errors - Allows you to select whether the adapter
will respond to a device error with a retry of the failed command.
0 ⇒ Do not retry for device errors.
1 ⇒ Retry commands returning bad SCSI status.
RBE Retry Bus (SCSI) Errors - Enables retries in the event that a command
fails.
0 ⇒ Do not perform Bus Error retries.
1 ⇒ Perform Bus Error retries.
Select Time-out
According to SCSI specifications, a target must respond to initiator selection
by asserting the BSY signal in response to SEL, with its ID on the bus. With
this field you can select the amount of time that the RF3880 adapter will wait
for response before timing out with an error.
The Select Time-out period is specified in increments of 1 millisecond. The
default value is 250 (FAH), which selects a period of 250 milliseconds.
The longest time-out period possible is 392 milliseconds, selected with a value
of 392 (188H). Any larger value placed in this field will still select 392
milliseconds.
A value of 0 will select the shortest time-out period possible, which is about 1
millisecond.
BITS
76543210
0 0 0 RBE RCE RPE ISB INT
Table 105: Bit-meanings of Retry Control Field