Texas Instruments 1394 Physical Layer Devices Errata

This document describes a slight potential for PHY lock-up in a receiving node (including a repeating node) when a peer node is powered off or unplugged while transmitting data to the receiving node. If node B is unplugged or powered down while transmitting, its peer node A could see corrupted data on its port's twisted pair lines during the unplug or powerdown sequence. A rare condition has been discovered in which the node A PHY has the potential to enter a lock-up state after receiving a particular sequence of corrupted signals on the twisted pairs during unplug or powerdown of node B as node B is transmitting. Node A does see the bus reset event caused by the unplug or powerdown of node B but does not complete the collection of valid SelfID's. When in this state, the node A PHY is unaware of and does not respond to the bus reset caused by the plug-in of a new node C (or to the power-up of node B), this causes the just-connected node B or C to continuously issue bus resets. This causes the entire network to cease to function until the node A PHY is hard reset or disconnected from the network. This condition has never been reported in normal use; rather, it was observed in rigorous lab testing. All future releases of these devices shall have this issue fixed.

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