參數(shù)資料
型號(hào)： μPD9210FGC-7EA
廠商： NEC Corp.
英文描述： USB Host Controller(USB主控制器)
中文描述： USB主機(jī)控制器（的USB主控制器）
文件頁(yè)數(shù)： 39/95頁(yè)
文件大?。?/td> 423K
代理商： ΜPD9210FGC-7EA
CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
39
3.5 Host Controller Communications Area
The HCCA (Host Controller Communications Area) is a 256-byte area in system memory that is used by the
system software for sending and receiving control/status information to and from the HC. The system software
always writes the address of the area to the HC’s HcHCCA field.
3.5.1 Host controller communications area format
Table 3-4. Description of Host Controller Communications Area
Offset
Size
(bytes)
Name
R/W
Description
0
128
HccalnterruptTable
R
This 32-Dword entry table is a pointer to ED interrupt lists.
0
×
80
2
HccaFrameNumber
W
This includes the current frame number. This value is updated by
the HC before periodic list servicing of the frame begins.
0
×
82
2
HccaPad1
W
When the HC updates the HccaFrameNumber value, the HC sets
“0” to this word.
0
×
84
4
HccaDoneHead
W
When the HC reaches the end of a frame and a decremented value
of “0” is shown as the Delay Interrupt value, the HC writes the
current HcDoneHead value to this field. At this point, interrupts
occur as valid interrupts. The HC does not write again until the
software clears the WD bit in the HcInterruptStatus register. If this
field has a value of “0”, interrupts can occur for reasons other than
updating of HccaDoneHead, and the HcInterruptStatus register
must be accessed to determine the cause of the interrupt. If this
field’s value is not “0”, the interrupt is due to updating of the Done
Queue. If this field’s LSb is not “0”, another interrupt event has
occurred. The HcInterruptStatus field must be checked to
determine the cause of that interrupt.
0
×
88
116
reserved
R/W
This field is reserved for use by the HC.
3.5.2 Host controller communications area description
HccaInterruptTable is a 32-Dword entry table which functions as a pointer to the ED list’s various interrupt lists.
The more of these lists that an ED is linked to, the higher the execution rate. The execution rate is 32 ms for an ED
that is in only one list, but it is 6 ms for an ED that is in two lists. An ED that is linked to all 32 lists is executed at a
rate of once per frame. The last entry in each of the 32 interrupt lists must specify an isochronous list.
After an SOF (Start Of Frame) token is sent, the HC overwrites HccaFrameNumber using the FrameNumber value
from HcFmNumber before it starting reading the ED to be serviced in a new frame.
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