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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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NET2890 数据表(PDF) 46 Page - List of Unclassifed Manufacturers |
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NET2890 数据表(HTML) 46 Page - List of Unclassifed Manufacturers |
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46 / 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 46 5.4.6 (Address 15h; EPUSBSTAT) Endpoint USB Status Register (one per Endpoint) Bits Description Read Write Default Value 7 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. Yes Yes/CLR 0 6 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. Yes Yes/CLR 0 5 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. Yes Yes/CLR 0 4 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. Yes Yes/CLR 0 3 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. Yes Yes/CLR 0 2 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. Yes Yes/CLR 0 1 Short Packet Transferred. The length of the last packet was less than the Maximum Packet Size (EPnPKTSIZ). Writing a 1 clears this bit. Yes Yes/CLR 0 0 Reserved. Yes No 0 5.4.7 (Address 16h; EPDOUT) Endpoint Data Out Register (one per Endpoint) Bits Description Read Write Default Value 7:0 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. Yes No 0 5.4.8 (Address 17h; EPDIN) Endpoint Data In Register (one per Endpoint) Bits Description Read Write Default Value 7:0 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. No Yes 0 |
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