net2890 ETC-unknow, net2890 Datasheet - Page 46

• Manufacturer Part Number: net2890
• Description: Interface Controller
• Manufacturer: ETC-unknow

Specification
5.4.6 (Address 15h; EPUSBSTAT) Endpoint USB Status Register (one per
Endpoint)
5.4.7 (Address 16h; EPDOUT) Endpoint Data Out Register (one per Endpoint)
5.4.8 (Address 17h; EPDIN) Endpoint Data In Register (one per Endpoint)
Bits
Bits
Bits
____________________________________________________________________________________
7:0
7:0
7
6
5
4
3
2
1
0
Description
Timeout. For an IN endpoint, the last USB packet transmitted was not acknowledged
by the Host PC, indicating a bus error. The Host PC will expect the same packet to
be retransmitted in response to the next IN token. For an OUT endpoint, the last USB
packet received had a CRC or bit-stuffing error, and was not acknowledged by the
NET2890. The packet will be retransmitted by the Host PC. Writing a 1 clears this
bit.
USB STALL Sent. The last USB packet could not be accepted or provided because
the endpoint was stalled, and was acknowledged with a STALL. Writing a 1 clears
this bit.
USB IN NAK Sent. The last USB IN packet could not be provided, and was
acknowledged with a NAK. Writing a 1 clears this bit.
USB IN ACK Rcvd. The last USB IN data packet transferred was successfully
acknowledged with an ACK from the host. Writing a 1 clears this bit.
USB OUT NAK Sent. The last USB OUT data packet could not be accepted, and
was acknowledged with a NAK to the host. If retries are disabled, the FIFO data may
be corrupted and the local CPU should flush the FIFO. Writing a 1 clears this bit.
USB OUT ACK Sent. The last USB OUT data packet transferred was successfully
acknowledged with an ACK to the host. Writing a 1 clears this bit.
Short Packet Transferred. The length of the last packet was less than the Maximum
Packet Size (EPnPKTSIZ). Writing a 1 clears this bit.
Reserved.
Description
Endpoint Data Out Register. For an OUT endpoint, this register is used by the local
CPU to read data from the endpoint’s FIFO. This register is unused for an IN
endpoint.
Description
Endpoint Data In Register. For an IN endpoint, this register is used by the local
CPU to write data to the endpoint’s FIFO. This register is unused for an OUT
endpoint.
335 Pioneer Way, Mountain View, California 94041
TEL [phone] FAX [phone]
NetChip Technology, Inc., 1999
Rev 2.0, Draft 9, July 16, 1999
http://www.netchip.com
NET2890 USB Interface Controller
Read
Read
Read
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes/CLR
Yes/CLR
Yes/CLR
Yes/CLR
Yes/CLR
Yes/CLR
Yes/CLR
Write
Write
Write
Yes
No
No
Default
Default
Default
Value
Value
Value
0
0
0
0
0
0
0
0
0
0
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