Pci 64-bit 66 mhz bus interface – HP XU800 User Manual
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2 System Board
PCI 64-bit Hub
The following table shows the available P64H features.
PCI 64-bit 66 MHz Bus Interface
The P64H provides the interface to a PCI 64-bit 66 MHz bus interface
supporting both 64-bit and 32-bit 33 MHz or 66 MHz devices.
This interface implementation is compliant with PCI Rev 2.2 Specification,
and it can support up to 533 MB/sec data transfer rates.
It also supports PCI master capabilities and the Adaptec AIC 7892
16-bit Ultra 160 SCSI controller.
A table on
shows the P64H interrupts.
Feature
Feature
•
PCI Interface:
❒ Both 64-bit and 32-bit 33 MHz or 66 MHz devices.
❒ Provides Synchronous operation to the P64H using
1:1(66 MHz) or 2:1 (33 MHz) hub interface/PCI bus gearing
ratio.
❒ Allows input/output operations to occur with processor
transactions to isolate traffic.
❒ Parity and System Error (PERR
# /
PERR
#).
❒ Allows peer-to-peer communication within a single PCI bus
segment.
❒ Provides PCI transaction forwarding for all I/O and memory
(Type 1-to-Type 1, Type 1-to-Type 0, Type 1 to a special
cycle).
❒ Provides address decoding for:
16-bit I/O addressing.
32-bit memory mapped I/O addressing.
44-bit prefetchable memory addressing (upstream only).
VGA addressing.
❒ Includes downstream LOCK
#
capabilities.
❒ Fast Back-to-Back cycles (upstream only).
❒ Bus parking.
❒ Implements Delayed Transaction for;
PCI configuration read/written I/O read, and memory read
commands (downstream).
Memory read, I/O read and I/O write commands (upstream).
•
Scalability / Flexibility:
❒ Provides arbitration support for all PCI devices.
❒ Supports 2 x 66 MHz PCI slots.
❒ Processes dual address cycle (DAC) for upstream access
>4 GB.
❒ Handles 3.3 V operation with 5.0 V tolerant on all input pins.
•
Upstream Hub Link 16 Interface:
❒ Connects to the MCH via a 16-bit hub interface.
❒ Provides 64-bit and 32-bit addressing.
❒ Utilizes 66 MHz base clock.
❒ Utilizes 133 MHz double-clocked strobes.
•
Integrated Functions:
❒ I/O APIC to provide 24 interrupts.
❒ Six copies of PCLKOUT signals to its PCI devices.