USB3300 datasheet(27/53 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001783B-page 27

USB3300

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 6-10, "External Vbus Indicator Logic".

6.1.7

USB3300 TRANSMITTER

The USB3300 ULPI transmitter fully supports HS, FS, and LS transmit operations. Figure 6-2, "ULPI Digital Block Dia-

gram" 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 high speed and full/low speed transmitters. When using the USB3300, Table 6-8, "DP/DM Termi-

nation vs. Signaling Mode" should always be used as a guideline on how to configure for various modes of operation.

The transmitter decodes the inputs of Xcvrselect, Termselect, opmodes, DpPulldown and DmPulldown to determine

what operation is expected. Users must strictly adhere to the modes of operation given in Table 6-8.

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

The USB3300 transmitter will transmit a 32-bit long high speed synch before every high speed packet. In full and low

speed modes a 8-bit synch is transmitted.

When the device or host needs to chirp for high speed port negotiation, the Opmode Bits=10 will turn off the bit-stuffing

and NRZI encoding in the transmitter. At the end of a chirp, the USB3300 Opmode register bits should be changed only

after the RXCMD linestate encoding indicates that the transmitter has completed transmitting. Should the opmode be

switched to normal bit-stuffing and NRZI encoding before the transmit pipeline is empty, the remaining data in the pipe-

line 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.

6.1.7.1

High Speed Long EOP

When operating as a Hi-Speed host, the USB3300 will automatically generate a 40 bit long End of Packet (EOP) after

a SOF PID (A5h). The USB3300 determines when to send the 40-bit long EOP by decoding the ULPI TXD CMD bits

[3:0] for the SOF. The 40-bit long EOP is only transmitted when the DpPulldown and DmPulldown bits are asserted. The

Hi-Speed 40-bit long EOP is used to detect a disconnect in high speed mode.

In device mode, the USB3300 will not send a long EOP after a SOF PID.

TABLE 6-5:

ULPI RX CMD ENCODING

Data [7:0]

Name

Description and Value

[1:0]

Linestate

UTMI Linestate Signals

DATA[1] = Linestate[1]

DATA[0] = Linestate[0]

[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]

Reserved

Always

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