FW82801BA S L5FC Intel, FW82801BA S L5FC Datasheet - Page 211
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FW82801BA S L5FC
Manufacturer Part Number
FW82801BA S L5FC
Description
Manufacturer
Intel
Datasheet
1.FW82801BA_S_L5FC.pdf
(671 pages)
Specifications of FW82801BA S L5FC
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5.19.6.2
Intel
®
82801EB ICH5 / 82801ER ICH5R Datasheet
Non-Transaction Based Interrupts
Data Buffer Error
This event indicates that an overrun of incoming data or a under-run of outgoing data has occurred
for this transaction. This would generally be caused by the ICH5 not being able to access required
data buffers in memory within necessary latency requirements. Either of these conditions causes
the C_ERR field of the TD to be decremented.
When C_ERR decrements to 0, the Active bit in the TD is cleared, the Stalled bit is set, the USB
Error Interrupt bit in the HC Status register is set to 1 at the end of the frame and a hardware
interrupt is signaled to the system.
Bit Stuff Error
A bit stuff error results from the detection of a sequence of more that six 1s in a row within the
incoming data stream. This causes the C_ERR field of the TD to be decremented. When the
C_ERR field decrements to 0, the Active bit in the TD is cleared to 0, the Stalled bit is set to 1, the
USB Error Interrupt bit in the HC Status register is set to 1 at the end of the frame and a hardware
interrupt is signaled to the system.
If an ICH5 process error or system error occur, the ICH5 halts and immediately issues a hardware
interrupt to the system.
Resume Received
This event indicates that the ICH5 received a RESUME signal from a device on the USB bus
during a global suspend. If this interrupt is enabled in the Interrupt Enable register, a hardware
interrupt is signaled to the system allowing the USB to be brought out of the suspend state and
returned to normal operation.
ICH5 Process Error
The HC monitors certain critical fields during operation to ensure that it does not process corrupted
data structures. These include checking for a valid PID and verifying that the MaxLength field is
less than 1280. If it detects a condition that would indicate that it is processing corrupted data
structures, it immediately halts processing, sets the HC Process Error bit in the HC Status register
and signals a hardware interrupt to the system.
This interrupt cannot be disabled through the Interrupt Enable register.
Host System Error
The ICH5 sets this bit to 1 when a Parity error, Master Abort, or Target Abort occur. When this
error occurs, the ICH5 clears the Run/Stop bit in the Command register to prevent further
execution of the scheduled TDs. This interrupt cannot be disabled through the Interrupt Enable
register.
Functional Description
211
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