NET2890 datasheet(36/73 Pages) ETC

36 / 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

5. Configuration Registers

5.1 Register Description

The NET2890 occupies a 32 byte local register space which can be accessed by a CPU on the local bus.

The base registers are accessed directly, while the paged registers are paged in using the PAGESEL

accessed directly from the Base Register range.

After the NET2890 is powered-up or reset, the registers are set to their default values. Writes to unused

registers are ignored, and reads from unused registers return a value of 0.

For compatibility with future revisions, reserved bits within a register should always be written with a zero.

5.2 Register Summary

5.2.1 Base registers (unpaged)

Address

Name

Page

00h

PAGESEL

Paged Register Select

01h

MAINCTL

Main Control

02h

DMACTL

DMA Control

03h

IRQSTAT1

Interrupt Request Status 1

04h

IRQSTAT2

Interrupt Request Status 2

05h

Reserved

06h

IDXADDR

Indexed Register Address

07h

IDXDATA

Indexed Register Data

08h

Reserved

09h

Reserved

0Ah

Reserved

0Bh

PKTLENLSB

Packet Length (LSB)

0Ch

PKTLENMSB

Packet Length (MSB)

0Dh-0Fh

Reserved

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