NET2890 datasheet(42/73 Pages) ETC

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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

5.4 Endpoint / FIFO Registers

There are 5 sets of endpoint / FIFO registers, one for each endpoint.

5.4.1 (Address 10h; EPCFG) Endpoint Configuration Register (one per

Endpoint)

NOTE: For Endpoint 0, all fields in this register are assigned to fixed values, and are RESERVED.

Bits

Description

Read

Write

Default

Value

7:4

Endpoint Number. This field selects the number of the endpoint. Valid numbers are

0 to 15. This field has no effect on Endpoint 0, which always has an endpoint

number of 0.

Yes

Endpoint Direction. This bit selects the direction of this endpoint, if it is

unidirectional. 0 = OUT, 1 = IN. Endpoint 0 is bi-directional, and ignores this bit.

The direction is with respect to the USB host point of view. Note that a maximum of

one OUT and IN endpoint is allowed for each endpoint number.

Yes

Endpoint Enable. When set, this bit enables this endpoint. This bit has no effect on

Endpoint 0, which is always enabled.

Yes

1:0

Endpoint Type. This field selects the type of this endpoint. Endpoint 0 is forced to a

Control type.

Value

Description

Reserved

Isochronous

2Bulk

Interrupt

Yes

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