SLINKCMD_2
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
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