USB334X datasheet(59/92 Pages) MICROCHIP

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DS00002646A-page 59

USB334x

In serial mode, interrupts are possible from unmasked sources. The state of each interrupt source is sampled prior to

the assertion of DIR and this is compared against the asynchronous level from interrupt source.

Exiting the serial modes is the same as exiting Low Power Mode. The Link must assert STP to signal the PHY to exit

serial mode. When the PHY can accept a command, DIR is de-asserted and the PHY will wait until the Link de-asserts

STP to resume synchronous ULPI operation. The RESETB pin can also be pulsed low to reset the USB334x and return

it to Synchronous Mode.

6.6.1

3-PIN FS/LS SERIAL MODE

Three pin serial mode utilizes the data bus pins for the serial functions shown in Table 6-8.

6.6.2

6-PIN FS/LS SERIAL MODE

Six pin serial mode utilizes the data bus pins for the serial functions shown in Table 6-9.

6.7

Carkit Mode

The USB334x includes Carkit Mode to support a USB UART and USB Audio Mode.

By entering Carkit Mode, the USB334x current drain is minimized. The internal PLL is disabled and the 60 MHz ULPI

CLKOUT will be stopped to conserve power by default. The Link may configure the 60 MHz clock to continue by setting

the ClockSuspendM bit of the Interface Control register before entering Carkit Mode. If set, the 60 MHz clock will con-

tinue during the Carkit Mode of operation.

TABLE 6-8:

PIN DEFINITIONS IN 3 PIN SERIAL MODE

Signal

Connected to

Direction

Description

tx_enable

DATA[0]

Active High transmit enable.

data

DATA[1]

I/O

TX differential data on DP/DM when tx_enable is high.

RX differential data from DP/DM when tx_enable is low.

SE0

DATA[2]

I/O

TX SE0 on DP/DM when tx_enable is high.

RX SE0_b from DP/DM when tx_enable is low.

interrupt

DATA[3]

OUT

Asserted when any unmasked interrupt occurs. Active high.

Reserved

DATA[7:4]

OUT

Driven Low.

TABLE 6-9:

PIN DEFINITIONS IN 6 PIN SERIAL MODE

Signal

Connected to

Direction

Description

tx_enable

DATA[0]

Active High transmit enable.

tx_data

DATA[1]

Tx differential data on DP/DM when tx_enable is high.

tx_se0

DATA[2]

Tx SE0 on DP/DM when tx_enable is high.

interrupt

DATA[3]

OUT

Asserted when any unmasked interrupt occurs. Active high.

rx_dp

DATA[4]

OUT

Single ended receive data on DP.

rx_dm

DATA[5]

OUT

Single ended receive data on DM.

rx_rcv

DATA[6]

OUT

Differential receive data from DP and DM.

Reserved

DATA[7]

OUT

Driven Low.

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