PCIe显卡，16对 Receive 信号是闲置的吗？

Quantum_

1. x16 的显卡， 共有HSI(0)n/p ~ HSI(15)n/p 16对Receive信号（显卡到CPU）.
2. 显卡只是一个输出设备，只接收CPU的输出， 并不需要与CPU高速交互。
7 a$ o8 `$ ~6 `1 E6 c3. 那么， 第1点描述的16对线， 是否就一直是闲置的？ (这么浪费，有点不可思议！特发此问）
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**参考文书：
https://en.wikipedia.org/wiki/PCI_Express
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% Z0 Q# X& x6 @; ], u% q谢谢！

超級狗

PCI Express Basics and Background
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Quantum_

Dear Super
I still can't understand what happened to PCIe receiver signals to make them transmit signal from Device to Host, after reading your attachment carefully.
7 v# T, \, {# @2 v2 r4 IDo you mean that the answer of my question is concluded in the chapter below?
8 ?; I$ [6 m: y) f* @" z& e"Credit-based flow control is point-to-point based, not end-to-end, "
or
"Split Transactions"

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Do you have any other stuff for a rookie EE to learn about the PCIe Dispaly Card.

7 a8 Q/ R& c: r' {Thanks very much.
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ykwym

PCIe的有些包发出来是需要接收端发信息回去，确保包是一定被收到的。so。。。

alexfu1984

就需要这个东东，好就一个字