82NM10 Datasheet, PDF (542/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

EHCI Controller Registers (D29:F7)
16.2.2.3
Bit
Description
2 Port Change Detect — R/WC. This bit is allowed to be maintained in the Auxiliary
power well. Alternatively, it is also acceptable that on a D3 to D0 transition of the EHCI
HC device, this bit is loaded with the OR of all of the PORTSC change bits (including:
Force port resume, overcurrent change, enable/disable change and connect status
change). Regardless of the implementation, when this bit is readable (i.e., in the D0
state), it must provide a valid view of the Port Status registers.
0 = No change bit transition from a 0 to 1 or No Force Port Resume bit transition from 0
to 1 as a result of a J-K transition detected on a suspended port.
1 = The Host controller sets this bit to 1 when any port for which the Port Owner bit is
set to 0 has a change bit transition from a 0 to 1 or a Force Port Resume bit
transition from 0 to 1 as a result of a J-K transition detected on a suspended port.
1 USB Error Interrupt (USBERRINT) — R/WC.
0 = No error condition.
1 = The Host controller sets this bit to 1 when completion of a USB transaction results in
an error condition (e.g., error counter underflow). If the TD on which the error
interrupt occurred also had its IOC bit set, both this bit and Bit 0 are set. See the
EHCI specification for a list of the USB errors that will result in this interrupt being
asserted.
0 USB Interrupt (USBINT) — R/WC.
0 = No completion of a USB transaction whose Transfer Descriptor had its IOC bit set.
No short packet is detected.
1 = The Host controller sets this bit to 1 when the cause of an interrupt is a completion
of a USB transaction whose Transfer Descriptor had its IOC bit set.
The Host controller also sets this bit to 1 when a short packet is detected (actual
number of bytes received was less than the expected number of bytes).
USB2.0_INTR—USB 2.0 Interrupt Enable Register
Offset:
MEM_BASE + 28h–2Bh
Default Value: 00000000h
Attribute:
Size:
R/W
32 bits
This register enables and disables reporting of the corresponding interrupt to the
software. When a bit is set and the corresponding interrupt is active, an interrupt is
generated to the host. Interrupt sources that are disabled in this register still appear in
the USB2.0_STS Register to allow the software to poll for events. Each interrupt enable
bit description indicates whether it is dependent on the interrupt threshold mechanism
(see Section 4 of the EHCI specification), or not.
Bit
31:6
5
Description
Reserved. These bits are reserved and should be 0 when writing this register.
Interrupt on Async Advance Enable — R/W.
0 = Disable.
1 = Enable. When this bit is a 1, and the Interrupt on Async Advance bit
(D29:F7:CAPLENGTH + 24h, bit 5) in the USB2.0_STS register is a 1, 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.
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