American Megatrends Excalibur PCI, User Manual

Page: 9 / 102

Excalibur PCI Pentium ISA Motherboard User's Guide
9
PCI,
Continued
PCI Features
• is processor-independent,
• has a multiplexed address, command, and data bus and supports burst mode operation on reads and writes,
• runs synchronous with the CPU at speeds up to 33 MHz,
• has a maximum data transfer rate of 120 MBs (with a peak rate of 132 MBs on a 32-bit data path),
• has a maximum data transfer rate of 240 MBs (with a peak rate of 264 MBs on a 64-bit data path),
• has an optional 64-bit data path that is transparently interoperable with the 32-bit data path,
• has low latency random accesses (about 60 ns write access latency) to slave registers from a PCI bus master
on the PCI bus,
• is capable of full concurrency with the processor and PCI bus masters,
• has full multimaster capability, allowing any PCI Master peer-to-peer access to any PCI slave,
• has hidden and overlapped central arbitration,
• has a low pin count (master - 47; slave - 45),
• has address and data parity, and
• uses three physical address spaces: 32-bit memory, 32-bit I/O, and a 256 byte-per-agent configuration
space.