![]() ![]() To sum up, we only need to flip the names on the link coming to the PCIe switch, since the PCIe switch acts as a device on the card the two links from the switch go to the E-key socket, and for that socket’s purposes, the PCIe switch acts as a host. As the diagram demonstrates, we connect the socket’s TX to chip’s RX and vice-versa if we ever get confused, the laptop schematic is there to help us make things clear. ![]() Connectors will use host-side naming, and vice-versa. PCIe needs TX pairs connected to RX on another end, like UART – and this is non-negotiable. By now, the schematic is done, the component placement has been figured out, and we only need to route the differential pairs – should be simple, right? Buckle up. We’ve started designing a PCIe card last week, an adapter from M.2 E-key to E-key, that adds an extra link to the E-key slot it carries – useful for fully utilizing a few rare but fancy E-key cards. ![]()
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