Community Translation: EZ-USB™FX3デバイスがホストからのウォームリセットLFPSに正しく応答しない -KBA234153
Version: **
This KBA describes the workaround for EZ-USB™ FX3 family of devices to prevent incorrect response to a warm reset LFPS. Details include trigger conditions, scope of impact, available workarounds, and silicon revision applicability. Contact your local sales representative if you have questions.
Part numbers affected
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Part number
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Device characteristic
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CYUSB301x-xxxx
CYUSB201x-xxxx
CYUSB306x-xxxx
CYUSB303x-xxxx
CYUSB3025-BZXI
CYUSB2024-BZXI
CYUSB2025-BZXI
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All variants
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EZ-USB™ FX3 qualification status
In Production
EZ-USB™ FX3 summary
The following table defines the applicability to available EZ-USB™ FX3 family devices.
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Items
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Part number
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Silicon revision
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Fix status
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EZ-USB™ FX3 device does not respond correctly to warm reset LFPS from the host.
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CYUSB301x-xxxx
CYUSB201x-xxxx
CYUSB306x-xxxx
CYUSB303x-xxxx
CYUSB3025-BZXI
CYUSB2024-BZXI
CYUSB2025-BZXI
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All revisions
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Use workaround
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EZ-USB™ FX3 device does not respond correctly to warm reset LFPS from the host.
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Problem definition
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When a USB host sends warm-reset LFPS, EZ-USB™ FX3 responds back with a warm-reset LFPS. As per USB 3.2 specification, warm reset LFPS should only be generated by a downstream port to an upstream port.
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Parameters affected
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NA
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Trigger condition(s)
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This condition is triggered when EZ-USB™ FX3 detects a warm reset LFPS sent by the host.
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Scope of impact
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When EZ-USB™ FX3 is connected to some hosts which use a re-timer and redriver, it is observed that the re-timer detects the LFPS from EZ-USB™ FX3 and handles it as a reset after the host has moved to the Rx detect state. This may cause the redriver to move to the U1 state resulting in link training failure.
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Workaround
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EZ-USB™ FX3 receives a state change interrupt whenever there is a LTSSM state change in the device. EZ-USB™ FX3 transitions to LTSSM reset state when it detects a warm reset LFPS. This state change interrupt is used to halt LFPS transmission till the device has reached LFPS polling state. It is observed that EZ-USB™ FX3 no longer transmits a warm reset LFPS signal in response to a detected warm reset after this workaround. The workaround is implemented in EZ-USB™ FX3 SDK v1.3.5.54 and the compiled libraries with this workaround are attached with this KBA.
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Fix status
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Suggested firmware workaround is tested and reliable.
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Attachments
EZ_USB_FX3_SDK_1_3_4_54_files.zip - Contains the compiled EZ-USB™ FX3 libraries and two code examples that use these library files.
