USB3280 datasheet(7/44 Pages) MICROCHIP

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DS00001898A-page 7

USB3280

4.0

INTERFACE SIGNAL DEFINITION

TABLE 4-1:

SYSTEM INTERFACE SIGNALS

Name

Direction

Active

Level

Description

RESET

(RST)

Input

High

Reset.

Reset all state machines. After coming out of reset,

must wait 5 rising edges of clock before asserting TXValid

for transmit.

See Section 7.8.3

XCVRSELECT

(XSEL)

Input

N/A

Transceiver Select.

This signal selects between the FS

and HS transceivers:

0: HS transceiver enabled

1: FS transceiver enabled.

TERMSELECT

(TSEL)

Input

N/A

Termination Select.

This signal selects between the FS

and HS terminations:

0: HS termination enabled

1: FS termination enabled

SUSPENDN

(SPDN)

Input

Low

Suspend.

Places the transceiver in a mode that draws

minimal power from supplies. Shuts down all blocks not

necessary for Suspend/Resume operation. While

suspended, TERMSELECT must always be in FS mode to

ensure that the 1.5k

Ω pull-up on DP remains powered.

0: Transceiver circuitry drawing suspend current

1: Transceiver circuitry drawing normal current

CLKOUT

(CLK)

Output

Rising Edge

System Clock

. This output is used for clocking receive

and transmit parallel data at 60MHz.

OPMODE[1:0]

(OM1)

(OM0)

Input

N/A

Operational Mode.

These signals select between the

various operational modes:

[1]

[0]

Description

0: Normal Operation

1: Non-driving (all terminations removed)

2: Disable bit stuffing and NRZI encoding

3: Reserved

LINESTATE[1:0]

(LS1)

(LS0)

Output

N/A

Line State

. These signals reflect the current state of the

USB data bus in FS mode, with [0] reflecting the state of

DP and [1] reflecting the state of DM. When the device is

suspended or resuming from a suspended state, the

signals are combinatorial. Otherwise, the signals are

synchronized to CLKOUT.

[1]

[0]

Description

0: SE0

1: J State

2: K State

3: SE1

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