NET2890 datasheet(19/73 Pages) ETC

19 / 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

4.5.1.1 Control Write Transfer

A successful control write transfer to Control Endpoint 0 consists of the following:

Transaction

Stage

Packet Contents

# of bytes

Source

Setup

Setup Token

SETUP PID, address, endpoint, and CRC5

Host

Data

DATA0 PID, 8 data bytes, and CRC16

Host

Status

ACK

NET2890

Data (zero, one

or more packets)

OUT Token

OUT PID, address, endpoint, and CRC5

Host

Data (1/0)

DATA PID, N data bytes, and CRC16

N+3

Host

Status

ACK

NET2890

Status

IN Token

IN PID, address, endpoint, and CRC5

Host

Data

DATA1 PID, zero length packet, and CRC16

NET2890

Status

ACK

Host

During the Setup transaction, the NET2890 stores the data stage packet in its Setup Registers. The

NET2890 returns an ACK handshake to the host after all 8 bytes have been received. A Setup Packet

Interrupt status bit is set to notify the local CPU that a setup packet has been received. The 8-byte data

packet is then read and interpreted by the local CPU. A Setup transaction cannot be stalled or NAKed, but if

the data is corrupted, then the NET2890 will not return an ACK to the host.

During the Data transaction, zero, one or more data packets are written into the Endpoint 0 FIFO. For each

packet:

•

Interrupt status bits are set and can interrupt the local CPU

•

The local CPU reads the FIFO

•

The NET2890 returns an ACK if no error has occurred.

For a successful Status transaction, the NET2890 returns a zero length data packet. A NAK or STALL can

be returned if an error occurred.

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