DaynaPort SCSI/Link: SCSI Command Set Revision 1.20 (16 July 2005) Copyright 2002-2005 by Roger Burrows. All Rights Reserved. Permission is granted to copy this document providing that no changes are made to the contents. LIMITATION OF LIABILITY AND DISCLAIMER OF WARRANTY -------------------------------------------------- The information cantained in this document is provided "as-is", without warranty of any kind, expressed or implied, including without limitation any warranty concerning the accuracy, adequacy, or completeness of such information or material. The Author shall not be responsible for any claims attributable to errors, omissions, or other inaccuracies in the information or material contained in this document, and in no event shall the Author be liable for direct, indirect, special, incidental, or consequential damages arising out of the use of such information or material. SCOPE ----- This document applies to the following hardware devices: DaynaPort SCSI/Link-T (Model DP0801) DaynaPort SCSI/Link-3 (Model DP0802) and to the following firmware revisions: 1.4a 2.0f It probably also applies to other firmware revisions; it may also apply to other Dayna SCSI/Link devices. Any feedback on this is welcomed. Please supply any additions or corrections to Roger Burrows (roger@anodynesoftware.com). REVISION HISTORY ---------------- Version 1.00 (8/August/2002) Original version Version 1.10 (22/April/2005) Added description of 'Set Interface Mode/Set MAC Address' command Version 1.20 (16/July/2005) Corrected description of 'Set Interface Mode/Set MAC Address' command NOTATION -------- All numbers are expressed in hexadecimal, unless otherwise noted. COMMAND SET SUMMARY ------------------- The following is a partial list of implemented SCSI commands: 03 Request Sense 08 Read 09 Retrieve Statistics 0a Write 0c Set Interface Mode / Set MAC Address 0e Enable/disable Interface 12 Inquiry A number of other SCSI commands are implemented, but their usage is not yet fully known. Enable/disable Interface (0e) ----------------------------- Command: 0e 00 00 00 00 XX (XX = 80 or 00) Function: Enable (80) / disable (00) Ethernet interface Type: No data transferred Notes: After issuing an Enable, the initiator should avoid sending any subsequent commands to the device for approximately 0.5 seconds Inquiry (12) ------------ Command: 12 00 00 00 LL 00 (LL is data length) Function: Perform a standard SCSI Inquiry command: reference the SCSI spec for further information Type: Input; reference the SCSI spec for the data returned Notes: The length is user-selectable to a maximum of 25 (37 decimal) Read (08) --------- Command: 08 00 00 LL LL XX (LLLL is data length, XX = c0 or 80) Function: Read a packet at a time from the device (standard SCSI Read) Type: Input; the following data is returned: LL LL NN NN NN NN XX XX XX ... CC CC CC CC where: LLLL is normally the length of the packet (a 2-byte big-endian hex value), including 4 trailing bytes of CRC, but excluding itself and the flag field. See below for special values NNNNNNNN is a 4-byte flag field with the following meanings: FFFFFFFF a packet has been dropped (?); in this case the length field appears to be always 4000 00000010 there are more packets currently available in SCSI/Link memory 00000000 this is the last packet XX XX ... is the actual packet CCCCCCCC is the CRC Notes: . When all packets have been retrieved successfully, a length field of 0000 is returned; however, if a packet has been dropped, the SCSI/Link will instead return a non-zero length field with a flag of FFFFFFFF when there are no more packets available. This behaviour seems to continue until a disable/enable sequence has been issued. . The SCSI/Link apparently has about 6KB buffer space for packets. Request Sense (03) ------------------ Command: 03 00 00 00 00 00 Function: Perform a standard SCSI Request Sense command Type: Input; reference the SCSI spec for the data returned Notes: . This command always transfers exactly 9 bytes of data (note that cdb byte 4 is always zero, however). . If the sense key is 5, the driver should reinitialise the device via a disable/enable sequence; otherwise, it need do nothing. Retrieve Statistics (09) ------------------------ Command: 09 00 00 00 12 00 Function: Retrieve MAC address and device statistics Type: Input; returns 18 (decimal) bytes of data as follows: . bytes 0-5: the current hardware ethernet (MAC) address . bytes 6-17: three long word (4-byte) counters (little-endian). Notes: The contents of the three longs are typically zero, and their usage is unclear; they are suspected to be: . long #1: frame alignment errors . long #2: CRC errors . long #3: frames lost Set Interface Mode (0c) ----------------------- Command: 0c 00 00 00 FF 80 (FF = 08 or 04) Function: Allow interface to receive broadcast messages (FF = 04); the function of (FF = 08) is currently unknown. Type: No data transferred Notes: This command is accepted by firmware 1.4a & 2.0f, but has no effect on 2.0f, which is always capable of receiving broadcast messages. In 1.4a, once broadcast mode is set, it remains set until the interface is disabled. Set MAC Address (0c) -------------------- Command: 0c 00 00 00 FF 40 (FF = 08 or 04) Function: Set MAC address Type: Output; overrides built-in MAC address with user-specified 6-byte value Notes: This command is intended primarily for debugging/test purposes. Disabling the interface resets the MAC address to the built-in value. Write (0a) ---------- Command: 0a 00 00 LL LL XX (LLLL is data length, XX = 80 or 00) Function: Write a packet at a time to the device (standard SCSI Write) Type: Output; the format of the data to be sent depends on the value of XX, as follows: . if XX = 00, LLLL is the packet length, and the data to be sent must be an image of the data packet . if XX = 80, LLLL is the packet length + 8, and the data to be sent is: PP PP 00 00 XX XX XX ... 00 00 00 00 where: PPPP is the actual (2-byte big-endian) packet length XX XX ... is the actual packet ========================= END OF DOCUMENT =========================