SAF1760BE/V1,557 NXP Semiconductors, SAF1760BE/V1,557 Datasheet - Page 101

• Manufacturer Part Number: SAF1760BE/V1,557
• Manufacturer: NXP Semiconductors

Specifications of SAF1760BE/V1,557

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
SAF1760_1
Product data sheet
17.3.3.2 Condition 2
17.3.3.3 Remarks
Condition 2 refers to the condition when a HALT occurs during PTD processing without
other bus errors (that is, babble, transaction error).
To determine and resolve the problematic condition, the following steps are taken:
See also
Because of this erratum, Keep-Alive EOP will not appear on the USB bus for more than
3 ms and the device will enter the suspend state. After implementing the above mentioned
workaround, Keep-Alive EOP will start and the device will wake up to continue the
function. In rare cases, because of the device implementation, there is a possibility that
the device may not accept further requests from the host after the workaround. In such
cases, application must perform the following partial enumeration steps to make the
device work:
As SAF1760 has individual port power control mechanism, above sequence will be
effective if the full-speed or low-speed device is directly connected to SAF1760 ports.
1. Port power off
2. Port power on
3. Get descriptor
4. Set interface
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Check the completion status once a PTD scheduled towards a full-speed or
low-speed device and connected through the internal hub is completed.
If the PTD has been completed successfully, clear the variable that keeps track of the
number of the times the port has been force enabled.
If the PTD has been completed with a HALT condition, get the port status of the port
on which it is connected to the internal hub.
Determine if the Port Enable bit is cleared when a device is still connected to the port.
Ensure that the port has not been force enabled three consecutive times by checking
the variable that keeps track of the number of times the port has been force enabled.
Otherwise, reset the port if it has been force enabled three consecutive times.
Invoke the software workaround.
Section
17.3.3.3.
Rev. 01 — 9 November 2009
Embedded Hi-Speed USB host controller
SAF1760
© NXP B.V. 2009. All rights reserved.
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