Specifications

17 January 1997 – Subject to Change
Functional Description 4–7
PCI Devices
Figure 4–3 AlphaPC 164 PCI Bus Devices
The PCI bus supports multiplexed, burst mode, read and write transfers. It supports
synchronous operation of between 25 MHz and 33 MHz. It also supports either a
32-bit or 64-bit data path with 32-bit device support in the 64-bit configuration.
Depending upon the configuration and operating frequencies, the PCI bus supports
anywhere between 100-MB/s (25 MHz, 32-bit) to 264-MB/s (33 MHz, 64-bit) peak
throughput. The PCI provides parity on address and data cycles. Three physical
address spaces are supported:
•
32-bit memory space
•
32-bit I/O space
•
256-byte-per-agent configuration space
PC164-04
CIA
pc164.7
82378ZB
pc164.22
pc164.18
PCI0646
SIO Bridge
IDE Controller
PCI Bus
PCI
Slot 0
J29
PCI
PCI
Slot 1
Slot 2
J26
J20
PCI
Slot 3
J19
Device IDSEL Select
pci_ad16
pci_ad17
pci_ad18
pci_ad19
pci_ad20
pci_ad21
pci_ad22
Slot 2
Slot 0
Slot 1
SIO Bridge
Slot 3
Reserved
IDE Control
Drive 0
J14
Drive 1
J13
ISA Bus