Document No.: FT_000589
FT313H USB2.0 HS Host Controller Datasheet Version 1.1
Clearance No.: FTDI# 318
Bit
Name
Type
Default value
Description
The Port Enable Bit and Suspend Bit of this
register define the port state as follows:
Bits[Port Enable, Suspend] Port State
0X
10
11
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.
Force Port Resume
6
F_PO_RESM
R/W
1’b0
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]
3
Reserved
RO
2’b00
-
Port Enable/Disable Change
PO_EN_CHG
R/WC
1’b0
1 = Port enable/disable status has changed.
0 = No change
Port Enable/Disable
2
PO_EN
R/W
1’b0
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.
Connect Status Change
1
0
CONN_CHG
CONN_STS
R/WC
1’b0
1’b0
1 = Change current connect status
0 = No change.
This bit indicates a change has occurred in the
current connect status of the port.
Current Connect Status
RO
1 = Device is presented on the port.
0 = No device is presented.
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