FT313HQ-R datasheet(28/67 Pages) FTDI

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Document No.: FT_000589

FT313H USB2.0 HS Host Controller Datasheet Version 1.2

Clearance No.: FTDI# 318

Bit

Name

Type

Default value

Description

The Port Enable Bit and Suspend Bit of this

Bits[Port Enable, Suspend]

Port State

Disable

Enable

Suspend

At the suspend state, the downstream

propagation of the data is blocked on this port,

except for the port reset. While at the suspend

state, the port is sensitive to resume detection.

Writing a ‘0’ to this bit is ignored by the host

controller. The host controller will

unconditionally set this bit to a ‘0’ when:

The software sets Force Port Resume bit to a ‘0’

(From a one)

The software sets Port Reset bit to a ‘1’ (From a

‘0’)

Note: Before setting this bit, RUN/STOP bit

should be set to 0.

F_PO_RESM

R/W

1’b0

Force Port Resume

1 = Resume detected/driven on port.

0 = No resume detected/driven on port.

Software sets this bit to a ‘1’ to resume signal.

The host controller sets this bit to a ‘1’ if a J-to-K

transition is detected while the port is in the

suspend state. When this bit transits to a ‘1’ for

the detection of a J-to-K transition, the Port

Change Detect bit in USBSTS register is also set

to a ‘1’.

[5:4]

Reserved

2’b00

PO_EN_CHG

R/WC

1’b0

Port Enable/Disable Change

1 = Port enable/disable status has changed.

0 = No change

PO_EN

R/W

1’b0

Port Enable/Disable

1 = Enable

0 = Disable

Ports can only be enabled by the host controller

as a part of the reset and enable. Software

cannot enable a port by writing a one to this

field.

CONN_CHG

R/WC

1’b0

Connect Status Change

1 = Change current connect status

0 = No change.

This bit indicates a change has occurred in the

current connect status of the port.

CONN_STS

1’b0

Current Connect Status

1 = Device is presented on the port.

0 = No device is presented.

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