suggestion about uPSD3400 series revision?

[hg-chen]

Posted on January 22, 2008 at 21:44

suggestion about uPSD3400 series revision?

[hg-chen]

Posted on May 17, 2011 at 11:51

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.