NET2890 datasheet(12/73 Pages) ETC

12 / 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

1.5.3 Functional Changes

•

Each of the four data endpoints (A-D) has a 128 byte FIFO permanently associated with it.

•

FIFOs 5-7 are obsolete: each endpoint has a FIFO attached to it (FIFO A - D), and each endpoint may

be configured as an IN or an OUT endpoint.

•

There is a separate 16 byte FIFO (FIFO 0) for Endpoint 0 (the default control pipe).

•

There is no second bank of SETUP registers.

•

“Packet Transmitted” interrupt (in EPIRQSTAT) only occurs when data is transmitted to the host

There is no interrupt when the NET2890 responds with a NAK or STALL to the host.

•

FIFO registers are grouped into the same page as the corresponding endpoint, instead of separate

pages.

•

FIFOs A-D increased to 128 bytes. Corresponding threshold and count registers increased to 8 bits.

•

Failed packets are automatically retried. If retries are enabled and a packet transfer fails, no interrupt or

status information in the NET2890 changes.

•

FIFO_VALID_MODE and FIFO_VALID can be used to generate zero-length-packets when required.

•

An interrupt (Control Status Phase) can be generated when the host begins a control status phase.

•

The new DIAG register can be used to artificially generate USB error conditions.

1.5.4 Documentation Changes

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Instead of referring to “Physical” endpoints 1-4 and “Logical” endpoints 1-4, the local side will access

endpoints as Endpoints A-D. Endpoints A-D may each be mapped to any available endpoint address (1-

15), in any direction.

•

References to “Mapped” registers are all changed to “Paged”.

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