FW82801DBM S L6DN Intel, FW82801DBM S L6DN Datasheet - Page 218

• Manufacturer Part Number: FW82801DBM S L6DN
• Manufacturer: Intel

Specifications of FW82801DBM S L6DN

• Lead Free Status / RoHS Status: Not Compliant

Functional Description
5.17.8.2
5.17.8.3
218
Device Connects
Section 4.2 of the Enhanced Host Controller Interface (EHCI) for Universal Serial Bus
Specification describes the details of handling Device Connects. There are four general scenarios
that are summarized below.
Device Disconnects
Section 4.2 of the Enhanced Host Controller Interface (EHCI) for Universal Serial Bus
Specification describes the details of handling Device Connects. There are three general scenarios
that are summarized below.
1. Configure Flag = 0 and a USB Full-speed/Low-speed -only Device is connected
2. Configure Flag = 0 and an USB High-speed-capable Device is connected
3. Configure Flag = 1 and a USB Full-speed/Low-speed-only Device is connected
4. Configure Flag = 1 and an USB High-speed-capable Device is connected
1. Configure Flag = 0 and the device is disconnected
2. Configure Flag = 1 and a USB Full-speed/Low-speed-capable Device is disconnected
3. Configure Flag = 1 and a USB High-speed-capable Device is disconnected
— In this case, the USB UHCI Controller is the owner of the port both before and after the
— In this case, the USB UHCI Controller is the owner of the port both before and after the
— In this case, the USB EHCI Controller is the owner of the port before the connect occurs.
— In this case, the USB EHCI Controller is the owner of the port before, and remains the
— In this case, the USB UHCI Controller is the owner of the port both before and after the
— In this case, the USB UHCI Controller is the owner of the port before the disconnect
— In this case, the USB EHCI Controller is the owner of the port before, and remains the
connect occurs. The EHC (except for the port-routing logic) never sees the connect occur.
The UHCI driver handles the connection and initialization process.
connect occurs. The EHC (except for the port-routing logic) never sees the connect occur.
The UHCI driver handles the connection and initialization process. Since the USB UHCI
Controller does not perform the high-speed chirp handshake, the device operates in
compatible mode.
The EHCI driver handles the connection and performs the port reset. After the reset
process completes, the EHC hardware has cleared (not set) the Port Enable bit in the
EHC’s PORTSC register. The EHCI driver then writes a 1 to the Port Owner bit in the
same register, causing the USB UHCI Controller to see a connect event and the EHC to
see an “electrical” disconnect event. The UHCI driver and hardware handle the
connection and initialization process from that point on. The EHCI driver and hardware
handle the perceived disconnect.
owner after, the connect occurs. The EHCI driver handles the connection and performs the
port reset. After the reset process completes, the EHC hardware has set the Port Enable bit
in the EHC’s PORTSC register. The port is functional at this point. The USB UHCI
Controller continues to see an unconnected port.
disconnect occurs. The EHC (except for the port-routing logic) never sees a device
attached. The UHCI driver handles disconnection process.
occurs. The disconnect is reported by the USB UHCI Controller and serviced by the
associated UHCI driver. The port-routing logic in the EHC cluster forces the Port Owner
bit to 0, indicating that the EHC owns the unconnected port.
owner after, the disconnect occurs. The EHCI hardware and driver handle the
disconnection process. The USB UHCI Controller never sees a device attached.
Intel
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82801DBM ICH4-M Datasheet