NH82801HBM S LB9A Intel, NH82801HBM S LB9A Datasheet - Page 208

• Manufacturer Part Number: NH82801HBM S LB9A
• Description: CONTROLLER HUB, ICH8M, I/O, 82801HBM
• Manufacturer: Intel

Specifications of NH82801HBM S LB9A

• Power Dissipation Pd: 2.4W
• Digital Ic Case Style: BGA
• No. Of Pins: 676
• Pci Bus Type: I/O Controller Hub
• Pci Express Base Spec: PCIe 1.1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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When the C_ERR field decrements to 0, the following occurs:
If the CRC/Time out interrupt is enabled in the Interrupt Enable register, a hardware
interrupt will be signaled to the system.
Interrupt on Completion
Transfer Descriptors contain a bit that can be set to cause an interrupt on their
completion. The completion of the transaction associated with that block causes the
USB Interrupt bit in the HC Status Register to be set at the end of the frame in which
the transfer completed. When a TD is encountered with the IOC bit set to 1, the IOC bit
in the HC Status register is set to 1 at the end of the frame if the active bit in the TD is
set to 0 (even if it was set to 0 when initially read).
If the IOC Enable bit of Interrupt Enable register (bit 2 of I/O offset 04h) is set, a
hardware interrupt is signaled to the system. The USB Interrupt bit in the HC status
register is set either when the TD completes successfully or because of errors. If the
completion is because of errors, the USB Error bit in the HC status register is also set.
Short Packet Detect
A transfer set is a collection of data which requires more than one USB transaction to
completely move the data across the USB. An example might be a large print file which
requires numerous TDs in multiple frames to completely transfer the data. Reception of
a data packet that is less than the endpoint’s Max Packet size during Control, Bulk or
Interrupt transfers signals the completion of the transfer set, even if there are active
TDs remaining for this transfer set. Setting the SPD bit in a TD indicates to the HC to
set the USB Interrupt bit in the HC status register at the end of the frame in which this
event occurs. This feature streamlines the processing of input on these transfer types.
If the Short Packet Interrupt Enable bit in the Interrupt Enable register is set, a
hardware interrupt is signaled to the system at the end of the frame where the event
occurred.
Serial Bus Babble
When a device transmits on the USB for a time greater than its assigned Max Length, it
is said to be babbling. Since isochrony can be destroyed by a babbling device, this error
results in the Active bit in the TD being cleared to 0 and the Stalled and Babble bits
being set to 1. The C_ERR field is not decremented for a babble. The USB Error
Interrupt bit in the HC Status register is set to 1 at the end of the frame. A hardware
interrupt is signaled to the system.
If an EOF babble was caused by the ICH8 (due to incorrect schedule for instance), the
ICH8 forces a bit stuff error followed by an EOP and the start of the next frame.
Stalled
This event indicates that a device/endpoint returned a STALL handshake during a
transaction or that the transaction ended in an error condition. The TDs Stalled bit is
set and the Active bit is cleared. Reception of a STALL does not decrement the error
counter. A hardware interrupt is signaled to the system.
• The Active bit in the TD is cleared
• The Stalled bit in the TD is set
• The CRC/Time-out bit in the TD is set.
• At the end of the frame, the USB Error Interrupt bit is set in the HC status register.
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Functional Description
ICH8 Family Datasheet