| Device specific known issues and workarounds |
| =============================================== |
| This page lists known issues and workarounds for specific devices. |
| |
| NXP LPC54600 |
| ---------------- |
| **Severity: High** |
| |
| **Not recommended for USB device applications (except high-speed host controller)** |
| |
| Reference: `LPC54600 Errata Sheet`_ |
| |
| .. _LPC54600 Errata Sheet: https://www.nxp.com/docs/en/errata/ES_LPC546XX.pdf |
| |
| The LPC54600 series have a very buggy USB controller, with 17 issues listed in the errata which is more than half of the total issues. |
| |
| Most severe issues are: |
| |
| - USB.2: In USB high-speed device mode, the NBytes field is not correct after BULK IN transfer |
| - USB.5: In USB full-speed host mode, linked list on done queue is broken. |
| - USB.15: USB high-speed device in endpoint TX data corruption |
| |
| WCH CH32F20x/CH32V20x/CH32V30x |
| --------------------------------- |
| **Severity: Medium** |
| |
| **Not recommended for USB audio applications** |
| |
| Reference: `CH32V30X Reference Manual`_ USBFS/USBHS controller chapter |
| |
| .. _CH32V30X Reference Manual: https://www.wch-ic.com/downloads/CH32FV2x_V3xRM_PDF.html |
| |
| Data corruption may occur on isochronous endpoints. Due to the lacking of FIFO for interrupt status registers, later completed transfer will overwrite `INT_ST` and `RX_LEN` register if previous transfer processing is not completed. |
| |
| Other types of transfers are not affected. |
