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The 64-bit PCI connector can be distinguished from a 32-bit connector by the additional 64-bit segment. Memory transactions between 64-bit devices may use all 64 bits to double the data transfer rate. Non-memory transactions (including configuration and I/O space accesses) may not use the 64-bit extension.
In those times, the fastest asynchronous voice-band modem could achieve at most speeds of 300 bit/s using frequency-shift keying (FSK) modulation, while synchronous modems could run at speeds up to 9600 bit/s using phase-shift keying (PSK). Synchronous transmission used only slightly over 80% of the bandwidth of the now more-familiar ...
6U cards have an identical J1, a J2 that is always used for 64-bit PCI, as well as J3, J4, and J5 connectors for a variety of uses either as user-defined I/O or specified signaling such as Telephony and/or Ethernet signaling. Hot-plugging is a supported feature of CompactPCI.
Most 32-bit PCI cards will function properly in 64-bit PCI-X slots, but the bus speed will be limited to the clock frequency of the slowest card, an inherent limitation of PCI's shared bus topology. For example, when a PCI 2.3 66-MHz card is installed into a PCI-X bus capable of 133 MHz, the entire bus backplane will be limited to 66 MHz.
It provided four PCI Express ×1 slots. The ×16 slot was provided by the MCH. The bottleneck Hub interface was replaced by a new Direct Media Interface (in reality a PCI Express ×4 link) with 1 GB/s of bandwidth per direction. Support for Intel High Definition Audio was included. In addition, AC'97 and the classical PCI 2.3 were still supported.
CardBus are PCMCIA 5.0 or later (JEIDA 4.2 or later) 32-bit PCMCIA devices, introduced in 1995 and present in laptops from late 1997 onward. CardBus is effectively a 32-bit, 33 MHz PCI bus in the PC Card design. CardBus supports bus mastering, which allows a controller on the bus to talk to other devices or memory without going through the CPU.
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One of the major improvements the PCI Local Bus had over other I/O architectures was its configuration mechanism. In addition to the normal memory-mapped and I/O port spaces, each device function on the bus has a configuration space, which is 256 bytes long, addressable by knowing the eight-bit PCI bus, five-bit device, and three-bit function numbers for the device (commonly referred to as the ...
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