USB333X datasheet(46/85 Pages) MICROCHIP

46 / 85 page

USB333x

DS00001880A-page 46

 2009 - 2015 Microchip Technology Inc.

Transfer of the RXCMD byte occurs in Synchronous Mode when the PHY has control of the bus. The ULPI Protocol

Block shown in Figure 6-1 determines when to send an RXCMD. A RXCMD will occur:

• When a linestate change occurs.

• When VBUS or ID comparators change state.

• During a USB receive when NXT is low.

• After the USB333x deasserts DIR and STP is low during start-up.

• After the USB333x exits Low Power Mode, Serial Modes, or Carkit Mode after detecting that the Link has de-

asserted STP, and DIR is low.

When a USB Receive is occurring, RXCMD’s are sent whenever NXT = 0 and DIR = 1. During a USB Transmit, the

RXCMD’s are returned to the Link after STP is asserted.

If an RXCMD event occurs during a High Speed USB transmit, the RXCMD is blocked until STP de-asserts at the end

of the transmit. The RXCMD contains the status that is current at the time the RXCMD is sent.

FIGURE 6-7:

ULPI RXCMD TIMING

TABLE 6-3:

ULPI RX CMD ENCODING

Data[7:0]

Name

Description and Value

[1:0]

Linestate

UTMI Linestate Signals. See Section 6.3.1.1

[3:2]

Encoded

VBUS State

ENCODED VBUS VOLTAGE STATES

VALUE

VBUS VOLTAGE

SESSEND

SESSVLD

VBUSVLD2

VVBUS < VSESS_END

VSESS_END < VVBUS <

VSESS_VLD

VSESS_VLD < VVBUS <

VVBUS_VLD

VVBUS_VLD < VVBUS

DIR

CLK

DATA[7:0]

STP

NXT

RXCMD

Idle

Turn around

RXCMD

Idle

Turn around

RXCMD

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