![]() ![]() This time period is given as t12-t10 in Table 6-22: At least 0.6 μs for U1, and at least 80 μs for U2 and U3. The purpose of this limit is to cover the case when both sides initiate a wakeup LFPS burst at the same time: Even though sensing the other side’s LFPS burst, both sides must continue transmitting the bursts long enough so the other side is guaranteed to detect it. It may seem odd that a minimal time for the initiating burst is defined at all: If the link partner responds with an LFPS, why not jump into the Gigabit phase immediately? This table is the reference in the following analysis of the these three items. ![]() Section 6.9.2 defines a significant number of timing restrictions in Table 6-22 for each of the low-power modes. This may have influence on the complexity of the detection mechanism, in particular for the short bursts possibly used to wake up from U1. In other words, how fast the detector needs to be.
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