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Mylex was bought by LSI Logic. Downloads {for
now] are HERE
LED Operation BIOS Revisions Access BusLogic Firmware Menus Drive Power Connector LittleFuse Multitasking ADF Sections BT-646 S/D and SDC3211F 32-Bit Fast SCSI-2 
U28 may be an
Emulex 2400150 or a QLogic FAS236FAS236 datasheet BT-646S
single-ended termination - has RP2 and RP3 only. BT-646D
differential termination - has RP6-RP13 DS36954AV The
DS36954 is a low power, quad EIA-485 differential bus
transceiver especially suited for high speed, parallel,
multipoint, I/O bus applications. Five devices can
implement a complete SCSI initiator or target interface.
Three transceivers in a package are pinned out for data
bus connections. The fourth transceiver, with the
flexibility provided by its individual enables, can
serve as a control bus transceiver.Datasheet Primary Controller in Non-IML System Enable the BIOS. Set your boot drive to ID0 or the BT-64x will not be able to boot from it. Also, you should set the boot drive to "autostart" so it spins up as soon as the system is turned on. I had a 0662 set to ID0, but the BT-646 complained about Target 0, Lun 0 not being detected, but then showed the 0662 at ID0, then the CD at 6,0. After jumpering the 0662 to autostart, everything was fine. BT-646S/D SCSI Adapter for
MicroChannel Systems A 20MHz Intel 80186 16-bit MPU is used to supply the speed for low command overhead. This MPU coordinates all activity on the BT-646S/D under the direction of the board’s firmware, including initialization, command decoding, interrupt generation, and control of the data flow among the board’s components. Accessing BusLogic Firmware Menus Boot from a DOS disk (which should include debug.exe) a:debug - -g=dc00:6 (BIOS Base Address:Offset Number) DC00 is the default BIOS address A screen will appear and prompt you to proceed. You can use these menus to SCSI Format (Low-Level Format) a disk, or perform other SCSI functions. Buslogic Tips * Ensure that all Buslogic Host Adapters in a Multiple Host environment are at the same Firmware/BIOS level. This is important if you are replacing or adding new Host Adapters in an existing system. * Check that C43, a surface mount capacitor on the reverse side of the PIB is removed. This was to cure loss of video on warm-boot. This change has been incorporated into the Buslogic Boards supplied with new Systems at Firmware level 3.37/4.73. * Prior to Firmware level 3.37/4.73 you must ensure that you do not have a Tape or CD- ROM device set at ID=1 on the Primary Host Adapter. It interferes with the Buslogic POST testing as it expects to see a Hard Disk only. * 3430 System BIOS 1.07 or greater is required for use with BusLogic cards. * DOS will only see two hard disks attached to the Buslogic Subsystem, at ID=0 and ID=1, you must use DOS device drivers to see any more. Refer to the RAID section of this manual for more info. * During Buslogic Initialization the screen shows which SCSI devices are responding on the Primary Host Adapter only. * You can use DOS Debug command to scan the SCSI Bus for devices. * Under NT 4.0, the MS default Buslogic driver will not allow sharing of interrupts. To work around this, use the driver from NT 3.5x or a copy of the driver from BusLogic/Mylex. Buslogic Firmware History There are 4 EPROMS on the Buslogic PIB's. 2 are the PIB's Firmware, U5 & U6. and two are BIOS extensions, U15 & U16. Current F/W levels (Note the version without a suffix is the latest, i.e. 3.36c precedes 3.36) Firmware EPROM BIOS EPROM U5 & U6 U15 & U16 NT USE? ------- --------- -------- 3.31 4.50 Do Not Use 3.36c 4.70 OK *1 *2 3.36 4.71A OK *2 3.36 4.73 OK *2 3.37f 4.73 OK 3.37 4.73 OK 3.38 4.73 OK (needed for Differential w NCR RAID) 3.39 4.73 OK (Required for NT 4.0) Ensure all Buslogic HBAs in Multiple Host environment use same Firmware/BIOS level. *1 - Does not issue spin-up command, so jumper Hard Disks to enable spin-up at power on. *2 - SCSI bug that causes periodic SCSI bus timeouts, and can be a problem for large NT systems. If you have these versions, check your Event Log for SCSI errors to determine if you need to upgrade. These versions will also give errors if Tape and CD-ROM devices are at ID=1 on the primary controller. Subsequent releases of firmware since 3.37f/4.73 correct various minor SCSI matters, but are not system threatening. LED Operation When power is first applied to the BT-640A, an on-board diagnostic routine is run to verify that the major functional components of the board are operating correctly. The bus master chip, the SCSI controller chip, the firmware PROM, the local RAM and internal data buses are tested. Results of the tests are indicated by an LED on the board. The LED will first turn on when power is applied. If the diagnostics find no malfunctions, the LED will then go off. In normal operation, the LED will be illuminated when command or SCSI bus activity occurs on the board. If an error is detected by the diagnostics, the LED will repeatedly flash a specific number of times, with a long pause between flashes, to indicate the board function which failed. This will continue until the board is powered down or reset. Failure interpretation from the number of flashes is as follows:
*This error is when single-ended SCSI drives are
connected to the differential SCSI bus. Disk Drive Power Connector A 4-pin disk drive power connector (J4) is located at the top edge of the BT-64x board next to the SCSI connector Jl. This connector provides +12V and +5V power. Note: The BT-64x brings the 12 volt power supply to the 4-pin power connector (14) via three gold fingers on the edge connector. The power rating of the Micro Channel edge connector on the12 volt is one ampere per finger. Consequently, the maximum power allowed from the 12 volts (Pin 1 of J4) is three amperes. Because certain large SCSI drives may require more than three amperes when their motors are spinning up, BusLogic recommends that this connector not be connected to these large SCSI drives. Based on the power rating of the SCSI drives, if is recommended that this power connector not be daisy chained to multiple drives. Term Power Fuse SDCxx11x and BT-64x use a Microlite Little Fuse that is 125v and 1.6A (Littel 27301.5 125V 1.5A or equivalent micro fuse). It is difficult to see that the fuse is blown so you will need to use a VOM to test for continuity. The fuse can blow if termination power settings are not correct on the SCSI devices or if you disconnect the SCSI cables while the card or SCSI devices have power. (Ed. Sure ain't kidding!) Multitasking Operation For operating systems such as UNIX, NetWare, and OS/2, the mailbox protocol of the BT-64x provides true multitasking operation. Through the use of a mailbox structure, the BT-64x can support up to 255 tasks with minimum host processor intervention. Onboard firmware controls all of the SCSI activity that a task requires, including the Arbitration, Selection, Disconnection, Reconnection, and command completion status. This same mailbox protocol supports both initiator and target mode operation permitting high speed host-to-host communication and scatter-gather data transfers. AdapterID 0709 BT-646 / SDC3211F 32-bit FAST SCSI Host Adapter File @0709.ALL Contains all of the options available to this adapter. I/O Port Address Interrupt Request Arbitration Level Adapter SCSI Bus ID
BIOS Address SCSI Parity Checking
Synchronous Negotiation
; The function of this bit was changed. The data width
function is detected by the host adapter and this switch
was ignored. Data Streaming Arbitration Fairness
1Gbyte Translation See the following section for more
details Disk > 1 GB and not SCO
UNIX. Under SC0 UNIX 3.2.2, the >lGB option must be turned off because the operating system itself has a 1 GByte limitation. Otherwise, disk images may be corrupted when the 1 GByte boundary is reached. For SC0 UNIX 3.2.4, the operating system does not impose the 1 GByte limit, and this option can be turned on or off accordingly. Consequently, the >lGByte support must be turned on under the following two conditions: (1) the combined space of all the DOS partitions exceeds lGByte, or (2) >lGByte disk accesses are required to boot the operating system. To enable the > 1 GB support, turn on this option. Note: If this option is changed, you must reformat the disk to avoid corrupting the existing file system. {Ed. The >1GB translation scheme is incompatible with IBM SCSI controllers. After formatting a DPES-13080 1.08GB drive on a BT-646S (>1GB translation enabled), I was unable to access it after then attaching the drive to a Corvette. I had to reformat the drive with the Corvette.] |