USB3320 datasheet(39/70 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001792B-page 39

USB3320

If an RXCMD event occurs during a 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.

Note 1:

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

The value of VbusValid is defined in Table 5-6.

Note 6-1

LineState: These bits in the RXCMD byte reflect the current state of the Full-Speed single ended

receivers. LineState[0] directly reflects the current state of DP. LineState[1] directly reflects the current

state of DM. When DP=DM=0 this is called "Single Ended Zero" (SE0). When DP=DM=1, this is

called "Single Ended One" (SE1).

6.2.4

USB3320 TRANSMITTER

The USB3320 ULPI transmitter fully supports HS, FS, and LS transmit operations. Figure 6-1 shows the high speed, full

speed, and low speed transmitter block controlled by ULPI Protocol Block. Encoding of the USB packet follows the bit-

stuffing and NRZI outlined in the USB 2.0 specification. Many of these functions are re-used between the HS and FS/LS

transmitters. When using the USB3320, Table 5-1 should always be used as a guideline on how to configure for various

modes of operation. The transmitter decodes the inputs of XcvrSelect[1:0], TermSelect, OpMode[1:0], DpPulldown, and

DmPulldown

to determine what operation is expected. Users must strictly adhere to the modes of operation given in

Table 5-1.

Several important functions for a device and host are designed into the transmitter blocks.

The USB3320 transmitter will transmit a 32-bit long high speed sync before every high speed packet. In full and low

speed modes a 8-bit sync is transmitted.

When the device or host needs to chirp for high speed port negotiation, the OpMode = 10b setting in the Function Con-

trol register will turn off the bit-stuffing and NRZI encoding in the transmitter. At the end of a chirp, the USB3320 OpMode

bits should be changed only after the RXCMD linestate encoding indicates that the transmitter has completed transmit-

ting. Should the opmode be switched to normal bit-stuffing and NRZI encoding before the transmit pipeline is empty, the

remaining data in the pipeline may be transmitted in an bit-stuff encoding format.

Please refer to the ULPI specification for a detailed discussion of USB reset and HS chirp.

TABLE 6-3:

ULPI RX CMD ENCODING

Data[7:0]

Name

Description and Value

[1:0]

Linestate

UTMI Linestate Signals Note 6-1

[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

[5:4]

Rx Event

Encoding

ENCODED UTMI EVENT SIGNALS

VALUE

RXACTIVE

RXERROR

HOSTDISCONNECT

[6]

State of ID

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 5.6.1.3

describes how a change on the ID pin can generate an interrupt. Section 6.6 describes

how an interrupt can be generated when the RidConversionDone bit is set.

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