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Answer: |
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1. point-to-point
links. And traditional compared to the PCI bus, PCI Express on
the way with the fundamental |
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innovation -- using point-to-point bus connections. We know that
the traditional PCI bus bandwidth is the |
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exclusive way to work. Any time a PCI bus can only have a
communications equipment, once on the PCI bus equipment |
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increased, Bus control over the use of the issue will be
seriously constrained PCI device performance play. PCI |
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Express, using the point-to-point connection, Each equipment in
the transmission of data required when building |
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their own transmission channels Other equipment for this channel
is closed, all Noninterference access, data |
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transmission efficiency so. |
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2. the
means of transmission of serial PCI Express for serial data
transmission, use "voltage differential signal |
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transmission", that is, two lines, to the inter-voltage
differential as a logic "0" and "1" gesture. Every two |
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lines to form a pathway (Lane), Each pathway theoretical
transmission rate of 2.5 Gbit / s, in reality there are |
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two transmission paths, into uplink and
downlink, this PCI Express can work in duplex mode, will provide
higher |
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transmission speed and quality. |
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3. high-speed
transmission into PCI Express x1, x2, x4, x8, x16 and x32
several forms. X1 shortest shape it, the more |
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it up longer. They are downward compatible. PCI Express
x16 on single channel with five GB / s (16 × 2.5Gb / 8 = |
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5GB / s) bandwidth, but because using eight b/10b coding, In
fact the effective bandwidth of 4 GB / s (deduct 20% |
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of the implanted clock signal). Similarly,
replace the existing PCI slots, the "PCI Express x1" single
channel |
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should be 250 MB / s with wide, and the traditional PCI bus
bandwidth of 133 MB / s. PCI-Express high-bandwidth, |
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to achieve higher data throughput capacity. |
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4. Hot
Swap support (must be mainboard support) PCI Express bus data
transmission distance of up to 3m. makes the |
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hardware subsystems can be completely separated from each
other space, the only cable link. It supports hot swap |
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function can be right all the access equipment for real-time
monitoring, This hardware manufacturers can design |
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the shape and size are consistent with the
requirements of the modular components, users need to expand and
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upgrade hardware, simply need to unplug the old, the new plant
will be, it does not shutdown. |
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5. Another
good compatibility of PCI Express software is compatible with
PCI-level norms, not update the operating |
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system and BIOS can be used. Future use of the PCI
Express bus can support the Main Board PCI slot, various PCI |
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expansion cards to be low bandwidth normal operation mode. This
PCI Express for the rapid popularization of the |
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foundation, without waiting for software to
face an embarrassing situation. |
