CS5535 datasheet(288/555 Pages) NSC

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288

Revision 0.8

USB Register Descriptions (Continued)

USBC_HcRhDescriptorA 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

PowerOnToPowerGoodTime

RSVD

NumberDownstreamPorts

USBC_HcRhDescriptorA Bit Descriptions

Bit

Name

HCD

Description

31:24

PowerOnTo

PowerGoodTime

R/W

PowerOn To PowerGood Time. This field value is represented

as the number of 2 ms intervals, ensuring that the power switch-

ing is effective within 2 ms. Only bits [25:24] are implemented as

R/W. The remaining bits are read only as 0. It is not expected that

these bits be written to anything other than 1h, but limited adjust-

ment is provided. This field should be written to support system

implementation. This field should always be written to a non-zero

value.

23:13

RSVD

R/W

Reserved. Read/write 0s.

NoOverCurrent

Protection

R/W

No Over-Current Protection. This bit should be written to sup-

port the external system port over-current implementation.

0: Over-current status is reported.

1: Over-current status is not reported.

OverCurrent

ProtectionMode

R/W

Over Current Protection Mode. This bit should be written 0 and

is only valid when NoOverCurrentProtection is cleared.

0: Global Over-Current.

1: Individual Over-Current

DeviceType

Device Type (Read Only). USB is not a compound device,

therefore this field will return 0.

9NoPower

Switching

R/W

No Power Switching. 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.

PowerSwitching

Mode

R/W

Power Switching Mode. This bit is only valid when NoPower-

Switching is cleared. This bit should be written 0.

0: Global Switching.

1: Individual Switching

7:0

NumberDown-

streamPorts

Number Downstream Ports (Read Only). USB supports two

downstream ports, therefore this field will return 02h.

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