CS5535 datasheet(289/555 Pages) NSC

289 / 555 page

Revision 0.8

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USB Register Descriptions (Continued)

5.5.4.20

Host Controller Root Hub Descriptor B (USBC_HcRhDescriptorB)

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.

5.5.4.21

Host Controller Root Hub Status (USBC_HcRhStatus)

This register is reset by the UsbReset state.

Note: Read back are 0s.

USB Memory Offset

4Ch

Type

HCD:

HC:

R/W

Reset Value

00000000h

USBC_HcRhDescriptorB Register Map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10

7654321

PortPowerControlMask

DeviceRemoveable

USBC_HcRhDescriptorB Bit Descriptions

Bit

Name

HCD

Description

31:16

PortPower

ControlMask

R/W

Port Power Control Mask. Global-power switching. This field is

only valid if NoPowerSwitching is cleared and PowerSwitching-

Mode is set (individual port switching). When set, the port only

responds to individual port power switching commands

(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

15:0

Device

Removeable

R/W

Device Removeable. USB ports default to removable devices.

0: Device not removable.

1: Device removable.

Port Bit relationship - Unimplemented ports are reserved,

read/write 0.

0: Reserved

1: Port 1

2: Port 2

...

15: Port 15

USB Memory Offset

50h

Type

HCD:

HC:

R/W

Reset Value

00000000h

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