USB3280 datasheet(8/44 Pages) MICROCHIP

8 / 44 page

USB3280

DS00001898A-page 8

 2004 - 2015 Microchip Technology Inc.

TABLE 4-2:

DATA INTERFACE SIGNALS

Name

Direction

Active

Level

Description

DATA[7:0]

(D7)

(D0)

Bidirectional

High

Data bus. 8-bit Bidirectional mode.

TXVALID

DATA[7:0]

output

input

TXVALID

(TXV)

Input

High

Transmit Valid.

Indicates that the DATA bus is valid for transmit. The

assertion of TXVALID initiates the transmission of SYNC on the USB

bus. The negation of TXVALID initiates EOP on the USB.

Control inputs (OPMODE[1:0], TERMSELECT,XCVRSELECT) must not

be changed on the de-assertion or assertion of TXVALID. The PHY

must be in a quiescent state when these inputs are changed.

TXREADY

(TXR)

Output

High

Transmit Data Ready.

If TXVALID is asserted, the SIE must always

have data available for clocking into the TX Holding Register on the

rising edge of CLKOUT. TXREADY is an acknowledgement to the SIE

that the transceiver has clocked the data from the bus and is ready for

the next transfer on the bus. If TXVALID is negated, TXREADY can

be ignored by the SIE.

RXVALID

(RXV)

Output

High

Receive Data Valid.

Indicates that the DATA bus has received valid

data. The Receive Data Holding Register is full and ready to be

unloaded. The SIE is expected to latch the DATA bus on the rising edge

of CLKOUT.

RXACTIVE

(RXA)

Output

High

Receive Active.

Indicates that the receive state machine has detected

Start of Packet and is active.

RXERROR

(RXE)

Output

High

Receive Error

0: Indicates no error.

1: Indicates a receive error has been detected.

This output is clocked with the same timing as the receive DATA lines

and can occur at anytime during a transfer.

TABLE 4-3:

USB I/O SIGNALS

Name

Direction

Active

Level

Description

I/O

N/A

USB Positive Data Pin.

I/O

N/A

USB Negative Data Pin.

TABLE 4-4:

BIASING AND CLOCK OSCILLATOR SIGNALS

Name

Direction

Active

Level

Description

RBIAS

(RB)

Input

N/A

External 1% bias resistor.

Requires a 12kΩ resistor to ground.

Used for setting HS transmit current level and on-chip termination

impedance.

XI/XO

Input

N/A

External crystal.

24MHz crystal connected from XI to XO.

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