2-54
Functional Description
Figure 2.6
Interrupt Routing Hardware Using the LSI53C1000
There can only be one entity controlling a mainboard SCSI core or
conflicts will occur. Typically a SCSI core is controlled by the SCSI BIOS
and an operating system driver. When a SCSI core is allocated to a RAID
adapter, however, a mechanism must be implemented to prevent the
SCSI BIOS and operating system driver from trying to access the SCSI
core. The mainboard designer has several options to choose from for
doing this.
•
The first option is to have the SCSI core load its PCI Subsystem ID
using a serial EPROM on power-up. If bit 15 in this ID is set, the LSI
Logic BIOS and operating system drivers will ignore the chip. This
makes it possible to control the assignment of the mainboard SCSI
cores using a configuration utility.
•
The second option is to provide mainboard and system BIOS
support for Nonvolative Storage (NVS). The SCSI core may then be
enabled or disabled using the SCSI BIOS configuration utility. Not all
versions of the drivers support this capability.
A4
A6
A7
SCSI Core
LSI53C1000
ALT_INTA/
2.7 K
+ 5 V
INTA/
INTA/
INTC/
TDI
+ 5 V
INT_DIR
PCI RAID
Upgrade
Slot INTA/
MB SCSI INTA/
These interrupt lines are
connected to the other PCI
slot interrupt lines as
determined by the
mainboard interrupt
routing scheme.
10 K
PCI RAID UPGRADE SLOT
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
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Страница 318: ...6 44 Specifications This page intentionally left blank...
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Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...