NET2890 datasheet(3/73 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

NET2890 USB Interface Controller

HIGHLIGHTS ...................................................................................................................................... 7

1.1

FEATURES ........................................................................................................................................ 7

1.2

OVERVIEW ....................................................................................................................................... 7

1.3

NET2890 BLOCK DIAGRAM ............................................................................................................ 9

1.4

NET2890 TYPICAL SYSTEM BLOCK DIAGRAM................................................................................ 9

1.4.1

Pin Changes .......................................................................................................................... 10

1.4.2

Register Changes .................................................................................................................. 10

1.4.3

Functional Changes .............................................................................................................. 10

1.5

CHANGES FROM REV 1 TO REV 2................................................................................................... 10

1.5.1

Pin Changes .......................................................................................................................... 10

1.5.2

Register Changes .................................................................................................................. 10

1.5.3

Functional Changes .............................................................................................................. 12

1.5.4

Documentation Changes ....................................................................................................... 12

PIN CONNECTION DIAGRAM ...................................................................................................... 13

PIN DESCRIPTION ........................................................................................................................... 14

FUNCTIONAL DESCRIPTION ....................................................................................................... 17

4.1

USB INTERFACE ............................................................................................................................ 17

4.2

USB PROTOCOL ............................................................................................................................ 17

4.2.1

Tokens ................................................................................................................................... 17

4.2.2

Packets .................................................................................................................................. 17

4.2.3

Transaction ........................................................................................................................... 17

4.2.4

Transfer................................................................................................................................. 17

4.3

AUTOMATIC RETRIES..................................................................................................................... 18

4.3.1

Out Transactions................................................................................................................... 18

4.3.2

In Transactions ..................................................................................................................... 18

4.4

PACKET LENGTHS .......................................................................................................................... 18

4.5

USB ENDPOINTS............................................................................................................................ 18

4.5.1

Control Endpoint - Endpoint 0 ............................................................................................. 18

4.5.2

Control Write Transfer Details .............................................................................................20

4.5.3

Isochronous Endpoints.......................................................................................................... 23

4.5.4

Bulk Endpoints ...................................................................................................................... 25

4.5.5

Interrupt Endpoints ............................................................................................................... 27

4.6

FIFOS ............................................................................................................................................ 28

4.6.1

IN FIFOs............................................................................................................................... 28

4.6.2

OUT FIFOs ........................................................................................................................... 29

4.7

INTERRUPT AND STATUS REGISTER OPERATION ............................................................................ 29

4.7.1

Interrupt Status Register 1 (IRQSTAT1) ............................................................................... 29

4.7.2

Interrupt Status Register 2 (IRQSTAT2) ............................................................................... 29

4.7.3

Endpoint Response Registers (EPRSPSET, EPRSTCLR) ..................................................... 29

4.7.4

Endpoint Interrupt Status Register (EPIRQSTAT)................................................................ 29

4.8

LOCAL BUS .................................................................................................................................... 30

4.8.1

Maximum Throughput........................................................................................................... 30

4.8.2

DMA Transfers from NET2890 to Local Bus........................................................................ 31

4.8.3

DMA Transfers from Local Bus to NET2890 ........................................................................ 31

4.8.4

Terminating DMA Transfers ................................................................................................. 32

4.9

SUSPEND MODE ............................................................................................................................. 33

4.9.1

The Suspend Sequence .......................................................................................................... 33

4.9.2

Host-Initiated Wake-Up ........................................................................................................ 33

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