NH82801FBM S L89K Intel, NH82801FBM S L89K Datasheet - Page 206

• Manufacturer Part Number: NH82801FBM S L89K
• Manufacturer: Intel

Specifications of NH82801FBM S L89K

• Lead Free Status / RoHS Status: Compliant

Functional Description
5.20.8.1
206
Figure 5-10. Intel
Port-Routing Logic
Integrated into the EHC functionality is port-routing logic, that performs the multiplexing between
the UHCI and EHCI host controllers. The ICH6 conceptually implements this logic as described in
Section 4.2 of the Enhanced Host Controller Interface Specification for Universal Serial Bus,
Revision 1.0. If a device is connected that is not capable of USB 2.0’s high-speed signaling
protocol or if the EHCI software drivers are not present as indicated by the Configured Flag, then
the UHCI controller owns the port. Owning the port means that the differential output is driven by
the owner and the input stream is only visible to the owner. The host controller that is not the owner
of the port internally sees a disconnected port.
Note that the port-routing logic is the only block of logic within the ICH6 that observes the
physical (real) connect/disconnect information. The port status logic inside each of the host
controllers observes the electrical connect/disconnect information that is generated by the
port-routing logic.
Only the differential signal pairs are multiplexed/demultiplexed between the UHCI and EHCI host
controllers. The other USB functional signals are handled as follows:
The Port-Routing logic is implemented in the Suspend power well so that re-enumeration and
re-mapping of the USB ports is not required following entering and exiting a system sleep state in
which the core power is turned off.
The ICH6 also allows the USB Debug Port traffic to be routed in and out of Port #0. When in this
mode, the Enhanced Host controller is the owner of Port #0.
•
The Overcurrent inputs (OC[7:0]#) are directly routed to both controllers. An overcurrent
event is recorded in both controllers’ status registers.
®
ICH6-USB Port Connections
Port 7
Port 6
Port 5
Port 4
Port 3
Port 2
Port 1
Port 0
Debug
Port
UHCI #3
(D29:F3)
Enhanced Host Controller Logic
Intel
(D29:F2)
UHCI #2
®
I/O Controller Hub 6 (ICH6) Family Datasheet
(D29:F1)
UHCI #1
(D29:F0)
UCHI #0