TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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11 TMC8462-BA Errata
11.1 Case 1 – Lost Link Counters
Description The TMC8462 features lost link error counters for each of the two MII ports. The Lost Link
Counters can be read from ESC addresses 0x0310 and 0x0311. See also Section 6.4.8.6.
The observed behavior is that after reset and after power cycling each counter already shows a value of 1
(one) but it should be 0 (zero). Regardless if there is a physical TPC cable connection to a master or another
slave or not. This behavior is repeatable. The same effect (increasing the counter) can be achieved by
manually disconnecting and re-connecting a TPC cable from an active port.
Impact on Applications There is no known impact on the application. The Lost Link Counters are for
diagnosis only and do not have a direct impact on other functions of the EtherCAT slave controller.
Root Cause The LINK/ACT LEDs also show a very short pulse of ca. 250 milliseconds after reset and
power-cycling which internally lead to a single increment of the Lost Link Counters. The root cause for this
behavior is not yet identified.
Possible Workaround There is no workaround available yet. Please check for updates.
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