NET2270 datasheet(24/90 Pages) ETC2

24 / 90 page

Specification

NET2270 USB Interface Controller

______________________________________________________________________________

 NetChip Technology, Inc., 2003

335 Pioneer Way, Mountain View, California 94041

TEL (650) 526-1490

FAX (650) 526-1494

http://www.netchip.com

Rev 3.6, April 17, 2003

4.5.5 I/O Performance

4.5.5.1 Non-Multiplexed Read Transaction

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Read Access Time: 35 nsec

•

I/O Recovery Time: 33 nsec

•

For an 8-bit bus, the maximum performance is:

1/68 nsec = 14 Mbytes/sec

•

For a 16-bit bus, the maximum performance is:

2/68 nsec = 29 Mbytes/sec

4.5.5.2 Multiplexed Read Transaction

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ALE Width: 5 nsec

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Address float: 5 nsec (system dependant)

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Read Access Time: 35 nsec

•

I/O Recovery Time: 33 nsec

•

For an 8-bit bus, the maximum performance is:

1/78 nsec = 13 Mbytes/sec

•

For a 16-bit bus, the maximum performance is:

2/78 nsec = 26 Mbytes/sec

4.5.5.3 Non-Multiplexed Write Transaction

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Write Width: 5 nsec

•

Write to Write Recovery Time: 55 nsec

•

For an 8-bit bus, the maximum performance is:

1/60 nsec = 16 Mbytes/sec

•

For a 16-bit bus, the maximum performance is:

2/60 nsec = 33 Mbytes/sec

4.5.5.4 Multiplexed Write Transaction

•

ALE Width: 5 nsec

•

Address float: 5 nsec (system dependant)

•

Write Width: 5 nsec

•

Write to Write Recovery Time: 55 nsec

•

For an 8-bit bus, the maximum performance is:

1/70 nsec = 14 Mbytes/sec

•

For a 16-bit bus, the maximum performance is:

2/70 nsec = 28 Mbytes/sec

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