Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21

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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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