FW82801ER S L742 Intel, FW82801ER S L742 Datasheet - Page 475
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FW82801ER S L742
Manufacturer Part Number
FW82801ER S L742
Description
Manufacturer
Intel
Datasheet
1.FW82801ER_S_L742.pdf
(671 pages)
Specifications of FW82801ER S L742
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12.2.3
12.2.4
Intel
®
82801EB ICH5 / 82801ER ICH5R Datasheet
USBINTR—USB Interrupt Enable Register
I/O Offset:
Default Value:
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. Fatal errors
(Host Controller Processor Error-bit 4, USBSTS Register) cannot be disabled by the host
controller. Interrupt sources that are disabled in this register still appear in the Status Register to
allow the software to poll for events.
FRNUM—Frame Number Register
I/O Offset:
Default Value:
Bits [10:0] of this register contain the current frame number that is included in the frame SOF
packet. This register reflects the count value of the internal frame number counter. Bits [9:0] are
used to select a particular entry in the Frame List during scheduled execution. This register is
updated at the end of each frame time.
This register must be written as a word. Byte writes are not supported. This register cannot be
written unless the host controller is in the STOPPED state as indicated by the HCHalted bit
(USBSTS register). A write to this register while the Run/Stop bit is set (USBCMD register) is
ignored.
15:11
15:4
10:0
Bit
Bit
3
2
1
0
Reserved
Short Packet Interrupt Enable — R/W.
0 = Disabled.
1 = Enabled.
Interrupt on Complete Enable (IOC) — R/W.
0 = Disabled.
1 = Enabled.
Resume Interrupt Enable — R/W.
0 = Disabled.
1 = Enabled.
Timeout/CRC Interrupt Enable — R/W.
0 = Disabled.
1 = Enabled.
Reserved
Frame List Current Index/Frame Number — R/W. This field provides the frame number in the
SOF Frame. The value in this register increments at the end of each time frame (approximately
every 1 ms). In addition, bits [9:0] are used for the Frame List current index and correspond to
memory address signals [11:2].
Base + (04
0000h
Base + (06
0000h
–
–
05h)
07h)
Description
Description
Attribute:
Size:
Attribute:
Size:
R/W (Writes must be Word Writes)
16 bits
UHCI Controllers Registers
R/W
16 bits
475
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