USB334X datasheet(65/92 Pages) MICROCHIP

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DS00002646A-page 65

USB334x

7.1.1.5

Function Control

Address = 04-06h (read), 04h (write), 05h (set), 06h (clear)

7.1.1.6

Interface Control

Address = 07-09h (read), 07h (write), 08h (set), 09h (clear)

Field Name

Bit

Access

Default

Description

XcvrSelect[1:0]

1:0

rd/w/s/c

01b

Selects the required transceiver speed.

00b: Enables HS transceiver

01b: Enables FS transceiver

10b: Enables LS transceiver

11b: Enables FS transceiver for LS packets (FS

preamble automatically pre-pended)

TermSelect

rd/w/s/c

Controls the DP and DM termination depending on

XcvrSelect, OpMode, DpPulldown, and DmPulldown.

The DP and DM termination is detailed in Table 5-1.

OpMode

4:3

rd/w/s/c

00b

Selects the required bit encoding style during

transmit.

00b: Normal Operation

01b: Non-Driving

10b: Disable bit-stuff and NRZI encoding

11b: Reserved

Reset

rd/w/s/c

Active high transceiver reset. This reset does not

reset the ULPI interface or register set. Automatically

clears after reset is complete.

SuspendM

rd/w/s/c

Active low PHY suspend. When cleared the PHY will

enter Low Power Mode as detailed in Section 6.5,

"Low Power Mode," on page 55. Automatically set

when exiting Low Power Mode.

LPM Enable

rd/w/s/c

When enabled the PLL start-up time is shortened to

allow fast start-up for LPM. The reduced PLL start-up

time is achieved by bypassing the VCO process

compensation which was done on initial start-up.

Field Name

Bit

Access

Default

Description

6-pin FsLsSerialMode

rd/w/s/c

When asserted the ULPI interface is redefined to the

6-pin Serial Mode. The PHY will automatically clear

this bit when exiting serial mode.

3-pin FsLsSerialMode

rd/w/s/c

When asserted the ULPI interface is redefined to the

3-pin Serial Mode. The PHY will automatically clear

this bit when exiting serial mode.

CarkitMode

rd/w/s/c

When asserted the ULPI interface is redefined to the

Carkit interface. The PHY will automatically clear this

bit when exiting Carkit Mode.

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