CS5535 datasheet(278/555 Pages) NSC

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278

Revision 0.8

USB Register Descriptions (Continued)

USBC_HcControl Bit Descriptions

Bit

Name

HCD

Description

31:11

RSVD

R/W

Reserved. Read/write 0s.

RemoteWakeup

Connected

Enable

R/W

Remote Wakeup Connected Enable. This bit is used by the

HCD to enable or disable the remote wakeup feature upon the

detection of upstream resume signaling. When this bit is set and

the ResumeDetected bit in HcInterruptStatus is set, a remote

wakeup is signaled to the host system. Setting this bit has no

impact on the generation of hardware interrupt.

In the host controller, this bit is cleared to 0 on hardware reset

and is write-read. Otherwise, it does nothing. It can be used as a

flag by software as indicated above. Setting this bit will not enable

or disable remote wakeup. That is covered in the Power Manage-

ment Controller.

RemoteWakeup

Connected

R/W

Remote Wakeup Connected. This bit indicates whether the HC

supports remote wakeup signaling. If remote wakeup is sup-

ported and used by the system it is the responsibility of system

firmware to set this bit during POST. The HC clears the bit upon a

hardware reset but does not alter it upon a software reset.

Remote wakeup signaling of the host system is host-bus-specific

and is not described in this specification.

In the host controller, it is cleared to 0 on hardware reset and is

write-read. Otherwise, it does nothing. It can be used as a flag by

software as indicated above.

InterruptRouting

R/W

Interrupt Routing. This bit is used for interrupt routing.

0: Interrupts routed to normal interrupt mechanism (INT).

1: Interrupts routed to SMI.

7:6

HostController

FunctionalState

R/W

Host Controller Functional State. This field sets the HC state.

The HC may force a state change from UsbSuspend to UsbRe-

sume after detecting resume signaling from a downstream port.

States are:

00: UsbReset.

01: UsbResume.

10: UsbOperational.

11: UsbSuspend.

BulkListEnable

R/W

Bulk List Enable. When set, this bit enables processing of the

Bulk list.

ControlList

Enable

R/W

Control List Enable. When set, this bit enables processing of

the Control list.

Isochronous

Enable

R/W

Isochronous Enable. When clear, this bit disables the Isochro-

nous List when the Periodic List is enabled (so Interrupt EDs may

be serviced). While processing the Periodic List, the HC will

check this bit when it finds an isochronous ED.

PeriodicList

Enable

R/W

Periodic List Enable. When set, this bit enables processing of

the Periodic (interrupt and isochronous) list. The HC checks this

bit prior to attempting any periodic transfers in a frame.

1:0

ControlBulk

ServiceRatio

R/W

Control Bulk Service Ratio. Specifies the number of Control

Endpoints serviced for every Bulk Endpoint. Encoding is N-1

where N is the number of Control Endpoints (i.e., 00 = 1 Control

Endpoint; 11 = 3 Control Endpoints).

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