38.6.3.13 Interrupts

See the structure of the USB host interrupt system on Figure 38-3.

There are two kinds of host interrupts: processing, i.e., their generation is part of the normal processing, and exception, i.e., errors (not related to CPU exceptions).

Global Interrupts

The processing host global interrupts are:

• Device Connection (USBHS_HSTISR.DCONNI)
• Device Disconnection (USBHS_HSTISR.DDISCI)
• USB Reset Sent (USBHS_HSTISR.RSTI)
• Downstream Resume Sent (USBHS_HSTISR.RSMEDI)
• Upstream Resume Received (USBHS_HSTISR.RXRSMI)
• Host Start of Frame (USBHS_HSTISR.HSOFI)
• Host Wakeup (USBHS_HSTISR.HWUPI)
• Pipe x (USBHS_HSTISR.PEP_x)
• DMA Channel x (USBHS_HSTISR.DMAxINT)

There is no exception host global interrupt.

Pipe Interrupts

The processing host pipe interrupts are:

• Received IN Data (USBHS_HSTPIPISRx.RXINI)
• Transmitted OUT Data (USBHS_HSTPIPISRx.TXOUTI)
• Transmitted SETUP (USBHS_HSTPIPISRx.TXSTPI)
• Short Packet (USBHS_HSTPIPISRx.SHORTPACKETI)
• Number of Busy Banks (USBHS_HSTPIPISRx.NBUSYBK)

The exception host pipe interrupts are:

• Underflow (USBHS_HSTPIPISRx.UNDERFI)
• Pipe Error (USBHS_HSTPIPISRx.PERRI)
• NAKed (USBHS_HSTPIPISRx.NAKEDI)
• Overflow (USBHS_HSTPIPISRx.OVERFI)
• Received STALLed (USBHS_HSTPIPISRx.RXSTALLDI)
• CRC Error (USBHS_HSTPIPISRx.CRCERRI)

  DMA Interrupts

The processing host DMA interrupts are:

• The End of USB Transfer Status (USBHS_HSTDMASTATUSx.END_TR_ST)
• The End of Channel Buffer Status (USBHS_HSTDMASTATUSx.END_BF_ST)
• The Descriptor Loaded Status (USBHS_HSTDMASTATUSx.DESC_LDST)

There is no exception host DMA interrupt.