Re: [smartmontools-support] Icybox IB319 external enclosure - broken JMicron bridge chip?

[Franc Z. <fz...@in...>]

>Date: Thu, 11 Aug 2011 13:18:23 +0100
>From: Tim Small <ti...@se...>
>Subject: [smartmontools-support] Icybox IB319 external enclosure -
>         broken  JMicron bridge chip?
>To: sma...@li...
>Message-ID: <4E4...@se...>
>Content-Type: text/plain; charset=ISO-8859-1
>
>FYI,
>
>I have an Icybox IB-319  (IB-319StUS2-B) (EAN 4250078184485 ) - it has a
>JMicron JM20329 USB bridge chip in it.  When connected over either USB
>or eSATA, running smartctl can make the bridge chip lock up.
>
>I can't really understand what's causing this in eSATA mode, because
>looking at the PCB traces, the eSATA signals do not go through the
>JM20329 - (actually the eSATA connector and the JM20329 have their data
>lines wired together, and then there are capacitors in between those
>traces and the SATA connector which goes to the drive - no other
>connections to the SATA data lines).  Maybe the JM20329 eavesdrops on
>the eSATA traffic?

FYI, here is a datasheet:
http://uploadpdf.icpdf.com/2009-8-12/JM20329_www.ic37.com.pdf

... and a reference circuit:
http://www.hxwtek.com/upload/jm20329_standardsch_lqfp48_1v0_for%20open.pdf

-Franc