NET2890 datasheet(16/73 Pages) ETC

16 / 73 page

Specification

NET2890 USB Interface Controller

____________________________________________________________________________________

NetChip Technology, Inc., 1999

335 Pioneer Way, Mountain View, California 94041

TEL (650) 526-1490

FAX (650) 526-1494

http://www.netchip.com

Rev 2.0, Draft 9, July 16, 1999

LRESET#

O, 12mA,

TP, PU

Local Reset. This active low output is asserted when either the

RESET# pin is asserted, or a USB upstream port reset is detected. This

signal is not driven while the device is suspended, but will be pulled

high by the internal pull-up resistor.

WAKEUP#

I, PU

Wakeup. This active low input causes the NET2890 to request a USB

remote wakeup if device remote wakeup is enabled.

BUSPWR#

I, S

Bus Powered. This active low input indicates that the logic external to

the NET2890 is powered by the USB bus. If this input is high, then the

external logic is self-powered. This bit is readable by the local CPU

through the MAINCTL configuration register. Alternatively, this bit

can be used as a general input signal.

PWRGOOD#

I, S

Power Good. This active low input indicates that an external power

supply used for self-powered mode is operational. This bit is readable

by the local CPU through the MAINCTL configuration register.

Alternatively, this bit can be used as a general input signal.

SOF#

O, 12 mA,

TP, PU

Start of Frame. This signal pulses low for 8 USB full speed clocks

when the Frame Timer is locked and an SOF token or synthesized SOF

token is detected.

TEST

I, PD

Test. For normal operation, connect this pin to ground.

TESTOUT

O, 12 mA

Test Output. Used for manufacturing test.

No connect.

VDD

(USB, Core)

1, 13,

25,

37,43

Power

Core Supply Voltage. Connect this pin to the +3.3V supply voltage to

supply the core and the USB interface.

VDD

(Local)

Power

Local Supply Voltage. Connect this pin to the +3.3V or +5.0V supply

voltage to supply the local interface.

VSS

12, 24,

36, 46,

GND

Device Ground. Connect this pin to ground.

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