CY3663 datasheet(21/92 Pages) CYPRESS

21 / 92 page

CY7C67200

Document Number: 38-08014 Rev. *I

Page 21 of 92

The USB n Control register is used in both host and device mode. It monitors and controls the SIE and the data lines of the USB ports.

This register can be accessed by the HPI interface.

Port A D+ Status (Bit 13)

The Port A D+ Status bit is a read-only bit that indicates the value

of DATA+ on Port A.

1: D+ is high

0: D+ is low

Port A D– Status (Bit 12)

The Port A D– Status bit is a read-only bit that indicates the value

of DATA– on Port A.

1: D– is high

0: D– is low

LOA (Bit 10)

The LOA bit selects the speed of Port A.

1: Port A is set to Low-speed mode

0: Port A is set to Full-speed mode

Mode Select (Bit 9)

The Mode Select bit sets the SIE for host or device operation.

When set for device operation only one USB port is supported.

The active port is selected by the Port Select bit in the Host n

Count Register.

1: Host mode

0: Device mode

Port A Resistors Enable (Bit 7)

The Port A Resistors Enable bit enables or disables the

pull-up/pull-down resistors on Port A. When enabled, the Mode

Select bit and LOA bit of this register sets the pull-up/pull-down

resistors appropriately. When the Mode Select is set for Host

mode, the pull-down resistors on the data lines (D+ and D–) are

enabled. When the Mode Select is set for Device mode, a single

pull-up resistor on either D+ or D–, determined by the LOA bit,

will be enabled. See Table 23 for details.

1: Enable pull-up/pull-down resistors

0: Disable pull-up/pull-down resistors

Port A Force D± State (Bits [4:3])

The Port A Force D± State field controls the forcing state of the

D+ D– data lines for Port A. This field forces the state of the Port

A data lines independent of the Port Select bit setting. See

Table 24 for details.

Suspend Enable (Bit 2)

The Suspend Enable bit enables or disables the suspend feature

on both ports. When suspend is enabled the USB transceivers

are powered down and can not transmit or received USB packets

but can still monitor for a wakeup condition.

1: Enable suspend

0: Disable suspend

Port A SOF/EOP Enable (Bit 0)

The Port A SOF/EOP Enable bit is only applicable in host mode.

In Device mode this bit must be written as ‘0’. In host mode this

bit enables or disables SOFs or EOPs for Port A. Either SOFs or

EOPs will be generated depending on the LOA bit in the USB n

Control Register when Port A is active.

1: Enable SOFs or EOPs

0: Disable SOFs or EOPs

Reserved

All reserved bits must be written as ‘0’.

Table 23. USB Data Line Pull-up and Pull-down Resistors

L0A

Mode

Select

Port n

Resistors

Enable

Function

Pull up/Pull down on D+ and

D– Disabled

Pull down on D+ and D–

Enabled

Pull up on USB D– Enabled

Pull up on USB D+ Enabled

Table 24. Port A Force D± State

Port A Force D± State

Function

MSB

LSB

Normal Operation

Force USB Reset, SE0 State

Force J-State

Force K-State

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