NET2890 datasheet(27/73 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

4.5.5 Interrupt Endpoints

Interrupt endpoints are used for returning small amounts of status information to the host with a bounded

service period. The USB Specification Version 1.0 only defines interrupt endpoint data transfers from the

device to the host (IN endpoints). In the NET2890, both directions of interrupt data transfers are supported.

4.5.5.1 Interrupt Out Transactions

Interrupt Out endpoints are used to transfer data from a USB host to the NET2890 local bus. An interrupt

OUT transaction to an Interrupt OUT endpoint consists of the following:

Stage

Packet Contents

# of

bytes

Source

OUT Token

OUT PID, address, endpoint, and CRC5

Host

Data (1/0)

DATA PID, N data bytes, and CRC16

N+3

Host

Status

ACK, NAK, or STALL

NET2890

The behavior of an Interrupt OUT endpoint is the same as a Bulk OUT endpoint, except for the toggle bit.

If the Interrupt Mode bit is cleared, the toggle bit of the Interrupt OUT endpoint is initialized to 0

(DATA0 PID), and behaves the same as a Bulk OUT endpoint. If the Interrupt Mode bit is set, the toggle

bit of the Interrupt OUT endpoint changes after each data packet is received from the host, without regard

to the Status stage.

Note: Interrupt write transactions are not supported in the Rev 1.0 USB Specification.

4.5.5.2 Interrupt In Endpoints

An Interrupt IN endpoint is polled at a rate which is specified in the endpoint descriptor. An interrupt

transaction from an Interrupt IN endpoint consists of the following:

Stage

Packet Contents

# of

bytes

Source

IN Token

IN PID, address, endpoint, and CRC5

Host

Data (1/0)

DATA PID, N data bytes, and CRC16

N+3

NET2890

Status

ACK

Host

The behavior of an Interrupt IN endpoint is the same as a Bulk IN endpoint, except for the toggle bit. If the

Interrupt Mode bit is cleared, the toggle bit of the Interrupt IN endpoint is initialized to 0 (DATA0 PID),

and behaves the same as a Bulk IN endpoint. An interrupt endpoint may be used to communicate rate

feedback information for certain types of isochronous functions. To support this mode, the Interrupt

Mode bit is set, and the toggle bit of the Interrupt IN endpoint changes after each data packet is sent to the

host, without regard to the Status stage.

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