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)： 70/95頁(yè)
文件大小： 423K
代理商： ΜPD9210FGC-7EA
CHAPTER 5 REGISTER INFORMATION
70
Register: HcLSThreshold
Offset Address: 44h
Read/Write
Field
Bit
HCD
HD
Value
(Default)
Comment
LSThreshold (LST)
11 : 0
R/W
R
0628h
This includes a value that is used to determine whether or
not to send the LS packet before the EOF token.
Reserved
31 : 12
R/W
R
Xh
Reserved
Register: HcRhDescriptorA
Offset Address: 48h
Read/Write
Field
Bit
HCD
HD
Value
(Default)
Comment
NumberDownstreamPorts
(NDP)
Note
7 : 0
R
R
02h
This bit indicates the number of downstream ports that are
supported by the root hub.
PowerSwitchingMode
(PSM)
Note
8
R/W
R
1b
0: Power supply is applied to all ports at the same time.
1: Power supply is applied separately to each port.
NoPowerSwitching (NPS)
Note
9
R/W
R
0b
0: Power supply to ports can be switched on and off.
1: Power supply to ports is always applied when HC’s
power is on.
DeviceType (DT)
Note
10
R
R
0b
Indicates that the root hub is not a hybrid type of device.
OverCurrentProtectionMode
(OCPM)
Note
11
R/W
R
1b
0: Overcurrent status is reported to all downstream ports
at once.
1: Overcurrent status is reported separately to each port.
NoOverCurrentProtection
(NOCP)
Note
12
R/W
R
0b
0: Overcurrent status is reported.
1: Overcurrent protection is not supported.
Reserved
23 : 13
R/W
R
Xh
Reserved
PowerOnToPowerGoodTime
(POTPGT)
Note
31 : 24
R/W
R
FFh
This bit indicates the amount of time that the HCD must
wait before accessing the root hub port to which a power
supply is applied.
Note
This field can only be used for hardware resets.
Register: HcRhDescriptorB
Offset Address: 4Ch
Read/Write
Field
Bit
HCD
HD
Value
(Default)
Comment
DeviceRemovable (DR)
Note
15 : 0
R/W
R
0000h
bit0: Reserved
bit1: Device is connected to Port#1
bit2: Device is connected to Port#2
…
bit15: Device is connected to Port#15
PortPowerControlMask
(PPCM)
Note
31 : 16
R/W
R
FFFEh
bit0: Reserved
bit1: Power supply to Port#1 set is masked
bit2: Power supply to Port#2 set is masked
…
bit15: Power supply to Port#15 set is masked
Note
This field can only be used for hardware resets.
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