Since PCI Extended lacks a split-response mechanism to permit the target to return data at a later time, the bus remains occupied by the target issuing retry-cycles until the read data is ready.
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10 Facts About PCI Extended
2.
PCI Extended suffered from the relative scarcity of unique interrupt lines.
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3.
PCI Extended-X added Message Signaled Interrupts, an interrupt system using writes to host-memory.
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4.
Intel gave only a qualified welcome to PCI Extended-X, stressing that the next generation bus would have to be a "fundamentally new architecture".
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5.
Actual PCI Extended-X branding only became standard later, likely coinciding with widespread availability of PCI Extended-X equipped motherboards.
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6.
Similar to PCI Extended-Express, PtP functions were added to allow for devices on the bus to talk to each other without burdening the CPU or bus controller.
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7.
PCI Extended-X revised the conventional PCI Extended standard by doubling the maximum clock speed and hence the amount of data exchanged between the computer processor and peripherals.
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8.
PCI Extended-X improves the fault tolerance of PCI Extended, allowing, for example, faulty cards to be reinitialized or taken offline.
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9.
The first is that PCI Extended-X is a 64-bit parallel interface that is backward compatible with 32-bit PCI Extended devices.
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10.
PCI Extended-X has technological and economical disadvantages compared to PCI Extended Express.
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