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Second attempt to use dual reset async fifos and pulse synchronizers. The first one was 9810ef9a, later on reverted by 93d49e1f, because it was causing sync problems when unplugging/replugging the fiber. The problem was in the endpoint's rx path, where one side of the reset (the rx_clk side) was taking into account the state of the PHY (via the phy_rdy_i signal), while the other side (the sys_clk side) was not. This has been fixed in this commit, by using phy_rdy_i as an active-low reset source for both clock domains of the rx path. Tested on an SPEC, works.
b6dfc740