USB Interrupt Status register
| ATL_IRQ_R | Field ATL_IRQ reader - ATL IRQ: Indicates that an ATL PTD (with I-bit set) was completed.
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| ATL_IRQ_W | Field ATL_IRQ writer - ATL IRQ: Indicates that an ATL PTD (with I-bit set) was completed.
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| FLR_R | Field FLR reader - Frame List Rollover: The host controller sets this bit to logic 1 when the frame list index rolls over its maximum value to 0.
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| FLR_W | Field FLR writer - Frame List Rollover: The host controller sets this bit to logic 1 when the frame list index rolls over its maximum value to 0.
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| INT_IRQ_R | Field INT_IRQ reader - INT IRQ: Indicates that an INT PTD (with I-bit set) was completed.
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| INT_IRQ_W | Field INT_IRQ writer - INT IRQ: Indicates that an INT PTD (with I-bit set) was completed.
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| ISO_IRQ_R | Field ISO_IRQ reader - ISO IRQ: Indicates that an ISO PTD (with I-bit set) was completed.
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| ISO_IRQ_W | Field ISO_IRQ writer - ISO IRQ: Indicates that an ISO PTD (with I-bit set) was completed.
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| PCD_R | Field PCD reader - Port Change Detect: The host controller sets this bit to logic 1 when any port has a change bit transition from a 0 to a one or a Force Port Resume bit transition from a 0 to a 1 as a result of a J-K transition detected on a suspended port.
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| PCD_W | Field PCD writer - Port Change Detect: The host controller sets this bit to logic 1 when any port has a change bit transition from a 0 to a one or a Force Port Resume bit transition from a 0 to a 1 as a result of a J-K transition detected on a suspended port.
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| R | Register USBSTS reader
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| SOF_IRQ_R | Field SOF_IRQ reader - SOF interrupt: Every time when the host sends a Start of Frame token on the USB bus, this bit is set.
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| SOF_IRQ_W | Field SOF_IRQ writer - SOF interrupt: Every time when the host sends a Start of Frame token on the USB bus, this bit is set.
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| USBSTS_SPEC | USB Interrupt Status register
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| W | Register USBSTS writer
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