Adaptec AHA-2742T User Manual - Page 57

Bus Release Time

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AHA-2740 Series User's Manual Note The IRQ cannot be shared with ISA mode SCSI host adapters such as the Adaptec AHA-1540 and AHA-1520 Series adapters. If those adapters are installed in your EISA system, they must be assigned unique IRQs. Interrupt Level Host Adapter Interface Definitions ( ) IRQ 11 ( ) IRQ 9 ( ) IRQ 10 ( ) IRQ 12 ( ) IRQ 14 ( ) IRQ 15 Done=F10 Figure 3-2. Selecting Interrupt Level Bus Release Time Select Bus Release Time to configure the amount of time, in BCLKS (Bus Clocks), the host adapter will continue to transfer data after being pre-empted in bus master mode. Figure 3-3 displays your choices. The default setting is 60 BCLKS. Normally 60 BCLKS is optimum; however, if multiple bus master cards are installed in the system, you may want to lower the value to free the EISA bus sooner. 3-6 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page 3-6) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Note
The IRQ cannot be shared with ISA mode SCSI host adapters
such as the Adaptec AHA-1540 and AHA-1520 Series adapters.
If those adapters are installed in your EISA system, they must
be assigned unique IRQs.
Bus Release Time
Select
Bus Release Time
to configure the amount of time, in
BCLKS (Bus Clocks), the host adapter will continue to transfer
data
after
being pre-empted in bus master mode. Figure 3-3
displays your choices. The default setting is
60 BCLKS
.
Normally 60 BCLKS is optimum; however, if multiple bus master
cards are installed in the system, you may want to lower the
value to free the EISA bus sooner.
Host Adapter Interface Definitions
Interrupt Level
(
) IRQ
11
(
) IRQ
9
(
) IRQ
10
(
) IRQ
12
(
) IRQ
14
(
) IRQ
15
Done=F10
<Edit Resources=F6>
<Cancel=ESC>
Figure 3-2.
Selecting Interrupt Level
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page 3-6)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
AHA-2740 Series User’s Manual
3-6