USB334X datasheet(50/92 Pages) MICROCHIP

50 / 92 page

USB334x

DS00002646A-page 50

 2009-2018 Microchip Technology Inc.

Note 1: An ‘X’ is a do not care and can be either a logic 0 or 1.

2: The value of VbusValid is defined in Table 5-5.

6.3.1.1

Definition of Linestate

The Linestate information is used to relay information back to the Link on the current status of the USB data lines, DP

and DM. The definition of Linestate changes as the USB334x transitions between LS/FS mode, HS mode, and HS

Chirp.

6.3.1.1.1

LS/FS Linestate Definitions

In LS and FS operating modes the Linestate is defined by the outputs of the LS/FS Single Ended Receivers (SE RX).

The logic thresholds for single ended receivers, VILSE and VILSE are shown in Table 4-6.

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, "Definition of Linestate," on page 50

[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

[5:4]

Rx Event

Encoding

ENCODED UTMI EVENT SIGNALS

VALUE

RXACTIVE

RXERROR

HOSTDISCONNECT

[6]

State of

ID pin

Set to the logic state of the ID pin. A logic low indicates an A device. A logic high

indicates a B device.

[7]

alt_int

Asserted when a non-USB interrupt occurs. This bit is set when an unmasked event

occurs on any bit in the Carkit Interrupt Latch register. The Link must read the Carkit

Interrupt Latch register to determine the source of the interrupt. Section 6.8, "RID

Converter Operation," on page 61 describes how an interrupt can be generated when

the RidConversionDone bit is set.

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