Pci Slot Numbering - Compaq AlphaServer DS20 Service Manual

Table 1-1 PCI Slot Numbering
Slot PCI0
5 PCI to ISA bridge
6 Adaptec SCSI
7 PCI slot
8 PCI slot
9 PCI slot
The logic for two PCI buses is on the system board.
•
PCI0 is a 64-bit bus with three PCI slots, a Cypress chip, and an Adaptec SCSI
controller. The Cypress chip is the PCI to ISA bus bridge and controls the
following: the keyboard, mouse, IDE bus, real-time clock, and the USB bus. (The
IDE bus and the USB bus are not used.) Connected to the ISA bus is an Adaptec
UltraSCSI controller with two ports (also not used).
•
PCI1 is a 64-bit bus with three PCI slots.
The cable connector to the floppy is on the system board. Connectors for the mouse,
keyboard, and COM2 are on the bulkhead and are connected directly to the Cypress
chip. The connector for COM1 is also on the bulkhead, but its path is from the
Cypress chip to the RCM connector out to the server feature module and back through
the RCM connector and then to the bulkhead. The path to the OCP is also carried
through the RCM connector to the server feature module and then on to the OCP.
PCI1 ISA
ISA device
PCI slot
PCI slot
PCI slot ISA device
Shared
logically
physically
System Overview 1-21