SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 295

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

Revision 3.0
Core Logic Module
Note:
Offset 4Ch-4Fh
Note:
Offset 50h-53h
31:16
30:18
15:0
14:2
7:0
Bit
31
17
16
15
9
8
This register is only reset by a power-on reset (PCIRST#). It is written during system initialization to configure the Root Hub.
These bit should not be written during normal operation.
This register is only reset by a power-on reset (PCIRST#). It is written during system initialization to configure the Root Hub.
These bit should not be written during normal operation.
Description
NoPowerSwitching. This bit should be written to support the external system port power switching implementation.
0: Ports are power switched.
1: Ports are always powered on.
PowerSwitchingMode. This bit is only valid when NoPowerSwitching is cleared. This bit should be written 0.
0: Global Switching.
1: Individual Switching
NumberDownstreamPorts (Read Only). USB supports three downstream ports.
PortPowerControlMask. Global-power switching. This field is only valid if NoPowerSwitching is cleared and Power-
SwitchingMode is set (individual port switching). When set, the port only responds to individual port power switching com-
mands (Set/ClearPortPower). When cleared, the port only responds to global power switching commands
(Set/ClearGlobalPower).
0: Device not removable.
1: Global-power mask.
Port Bit relationship - Unimplemented ports are reserved, read/write 0.
0 = Reserved
1 = Port 1
2 = Port 2
...
15 = Port 15
DeviceRemoveable. USB ports default to removable devices.
0: Device not removable.
1: Device removable.
Port Bit relationship
0 = Reserved
1 = Port 1
2 = Port 2
...
15 = Port 15
Unimplemented ports are reserved, read/write 0.
ClearRemoteWakeupEnable (Write Only). Writing a 1 to this bit clears DeviceRemoteWakeupEnable. Writing a 0 has no
effect.
Reserved. Read/Write 0s.
OverCurrentIndicatorChange. This bit is set when OverCurrentIndicator changes. Writing a 1 clears this bit. Writing a 0
has no effect.
Read: LocalPowerStatusChange. Not supported. Always read 0.
Write: SetGlobalPower. Write a 1 issues a SetGlobalPower command to the ports. Writing a 0 has no effect.
Read: DeviceRemoteWakeupEnable. This bit enables ports' ConnectStatusChange as a remote wakeup event.
0: Disabled.
1: Enabled.
Write: SetRemoteWakeupEnable. Writing a 1 sets DeviceRemoteWakeupEnable. Writing a 0 has no effect.
Reserved. Read/Write 0s.
Table 5-42. USB_BAR+Memory Offset: USB Controller Registers (Continued)
(Continued)
HcRhDescriptorB Register (R/W)
HcRhStatus Register (R/W)
295
Reset Value = 00000000h
Reset Value = 00000000h
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