Registered on :
10-30-2003
From Taiwan
Messages : 139
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Is there any suggestion about using uPSD3454 and face a USB boot or reboot fail in some PC or server (ex.model system x3200) with suspect of relating to the 34.9 of PCN listed below ?
PCN MPA-MIC/06/1940
Notification Date 07/18/2006
34.9 Missing ACK to host retransmission of SETUP packet
Description
If a host does not properly receive the ACK (due to noise) from the uPSD3400 in response
to a SETUP packet, it will resend the SETUP packet but the uPSD3400 will not respond with an ACK. The host will resend the SETUP packet a number of times and if an ACK is not
received from the uPSD3400, the host will issue a USB reset and then enumerate it again.
Upon detecting a USB reset, the uPSD3400 firmware will reset and initialize the USB SIE
putting the hardware back into the reset/initialized state so that when the next SETUP
packet is received, the uPSD3400 will respond with an ACK to the host.
Impact On Application
If this occurs during enumeration, the impact is minimal as the host will retry the
enumeration. If it happens after enumeration, the communication will break down between
the host application and the uPSD3400 and will need to be re-established after the
uPSD3400 is reset and enumerated again. In extremely noisy environments, the
uPSD3400 may not communicate well over USB with the host application.
Workaround
Revision A and B - None identified at this time.
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suggestion about uPSD3400 series revision?
Posted 23-01-2008 at 02:14 
