Field Name Bits Default Description
USB Interrupt
Enable
0 0b When this bit is a one, and the USBINT bit in the USBSTS register is a
one, the host controller will issue an interrupt at the next interrupt
threshold. The interrupt is acknowledged by software clearing the
USBINT bit.
USB Error
Interrupt Enable
1 0b When this bit is a one, and the USBERRINT bit in the USBSTS register is
a one, the host controller will issue an interrupt at the next interrupt
threshold. The interrupt is acknowledged by software clearing the
USBERRINT bit.
Port Change
Interrupt Enable
2 0b When this bit is a one, and the Port Change Detect bit in the USBSTS
register is a one, the host controller will issue an interrupt. The interrupt is
acknowledged by software clearing the Port Change Detect bit.
Frame List
Rollover Enable
3 0b When this bit is a one, and the Frame List Rollover bit in the USBSTS
register is a one, the host controller will issue an interrupt. The interrupt is
acknowledged by software clearing the Frame List Rollover bit.
Host System Error
Enable
4 0b When this bit is a one, and the Host System Error Status bit in the
USBSTS register is a one, the host controller will issue an interrupt. The
interrupt is acknowledged by software clearing the Host System Error bit.
Interrupt on Async
Advance Enable
5 0b When this bit is a one, and the Interrupt on Async Advance bit in the
USBSTS register is a one, the host controller will issue an interrupt at the
next interrupt threshold. The interrupt is acknowledged by software
clearing the Interrupt on Async Advance bit.
Reserved 31:6 These bits are reserved and should be zero
FRINDEX –RW - 32 bits - [EOR_Reg : EHCI_EOR + 0Ch] Field Name Bits Default Description
Frame Index 13:0 0h W hen this bit is a one, and the Interrupt on Async Advance bit in the
USBSTS register is a one, the host controller will issue an interrupt at the
next interrupt threshold. The interrupt is acknowledged by software
clearing the Interrupt on Async Advance bit.
Reserved 31:14 These bits are reserved and should be zero
CTRLDSSEGMENT –RW - 32 bits - [EOR_Reg : EHCI_EOR + 10h] Field Name Bits Default Description
CTRLDSSEGME
NT
31:0 0h This 32-bit register corresponds to the most significant address bits
[63:32] for all EHCI data structures. If the 64-bit Addressing Capability
field in HCCPARAMS is a zero, then this register is not used. Software
cannot write to it and a read from this register will return zeros.
If the 64-bit Addressing Capability
field in HCCPARAMS is a one, then
this register is used with the link pointers to construct 64-bit addresses to
EHCI control data structures. This register is concatenated with the
link pointer from either the PERIODICLISTBASE, ASYNCLISTADDR, or
any control data structure link field to construct a 64-bit address.
This register allows the host software to locate all control data structures
within the same 4 Gigabyte memory segment.
PERIODICLISTBASE –RW - 32 bits - [EOR_Reg : EHCI_EOR + 14h] Field Name Bits Default Description
Reserved 11:0 These bits are reserved. Must be written as 0s. During runtime, the
values of these bits are undefined.
Base Address 31:12 000h These bits correspo nd to memory address signals [31:12], respectively.