Info needed on SCSI card from IBM RS/6000
Dave (from the UK)
card?
This card as two internal connectors (50 and 68 pin) and one external
one (68-pin). I want to connect it to a device externally that is 50
pins, via a 68-> 50 cable.
I'm hoping it might be possible to terminate the high byte only and
leave the low-byte unterminated. But with no information on the card, I
don't know.
--
Dave K MCSE.
MCSE = Minefield Consultant and Solitaire Expert.
Please note my email address changes periodically to avoid spam.
It is always of the form: month-year@domain. Hitting reply will work
for a couple of months only. Later set it manually.
Eric Kollerie
Type 4-K #6206 - Bloomer
AIX 4.1 and 4.2 fileset: #6206 devices.pci.00100f00.xxx
Common Symbios PCI SCSI I/O Controller
Standard NCR53C810 SCSI Software
Support AIX 4.2 IX65868
AIX 4.1 IX65866
a.. Current level of devices.pci.00100f00.* SYM53C8xxA PCI SCSI I/O
a.. Current level of devices.pci.00100100.com Common Symbios PCI SCSI
/O
a.. Current level of devices.pci.00100100.rte Standard NCR53C810 SCSI
oftware
___________ J3
|__________| 50-pos |________
|_ __________________ |
68-pos || | |__________________| |
conn || | J4 internal 68-pos |
16-bit || | |
|| | |
J2 || | FRU P/N 93H3809 |
|| | _____ |
|_| __ |_J7__| _ ___|
|___| |_______________| |__|
Adapter-to-First Device Cables
F/C Cable Description
Length (meters)
_________________________________________________________________________________________ 2111 Adapter-to-first device (where first device has 70G98581.0 two connectors), 8-bit narrow bus 2113 Adapter-to-first device (where first device has 52G01741.5 one connectors), 8-bit narrow bus 2115 Adapter-to-first device (where first device has 52G01741.5 two connectors), 16-bit narrow bus 06H60361.0 SCSI adapter to backplane 06H6660Jumper Settings and Multi-Adapter ConfigurationsThe PCI SCSI-2 Fast/WideSingle-Ended Adapter contains built-in SCSI terminators.The adapterdetermines if it is in the middle of the SCSI chain or at the end ofthechain and enables or disables the built-in terminators as required. Thisisaccomplished by determining which, if any, cables are attached to theadapter.Jumper Block J7: The default configuration for the adapter placesall the jumpersettings to OUT and is how the adapter is shipped. Thisconfiguration is for a singleadapter on a SCSI chain allowing the adapter tosense where it is in the chain, in themiddle or on the end. The adapterenables or disables its built-in SCSI terminator asrequired.Typicalinstallations use only one adapter with some internal or externalSCSIdevices. In these cases, the jumpers are left in the factoryposition.Multi-Adapter Configurations: Using more than one SCSI adapter onanysingle SCSI bus may require the automatic termination sensing logic tobeoverridden by setting the individual jumpers on jumper block J7.Theautomatic sensing logic that controls the enablement and disablement ofthebuilt-in terminators detects external and internal terminators on theexternal andinternal SCSI bus. This control logic cannot sense otherbuilt-in terminators ofanother adapter on the SCSI bus. For those instances,you must tell the adaptersthat the external cabling is in use by moving thejumpers on jumper block J7.Switch Setting Definitions: The various switchsettings and cable attachmentscan be combined in many different ways. Thefollowing switch setting definitionsexplain how the terminators areaffected:S1 When placed in the OUT position, the termination controllogicautomatically determines the attachment or non-attachment of aninternalnarrow cable and terminator.When placed in the IN position, thetermination control logic indicates thatan internal narrow cable andterminator is attached.S2 When placed in the OUT position, the terminationcontrol logicautomatically determines the attachment or non-attachment of aninternalwide SCSI cable and terminator.Appendix C. Jumper Settings andMulti-Adapter Configurations C-1When placed in the IN position, thetermination control logic indicates thatan internal wide device isattached.S3 When placed in the OUT position, the termination controllogicautomatically senses a narrow or wide SCSI cable and terminator ontheexternal bus.When placed in the IN position, the termination controllogic indicates thatan external narrow SCSI cable and terminator isattached.This is useful in cases where a narrow device is incorrectlyidentified aswide. This is necessary if the SCSI cable improperly groundsall unusedpins, which indicates to the logic that a wide cable andterminator isattached.S4 When placed in the OUT position, the terminationcontrol logicautomatically determines that a cable and terminator areattached to theexternal bus. This is used in conjunction with S3 todetermine whether acable and terminator is attached and whether it is narrowor wide.When placed in the IN position, the termination control logicindicates thatan external device is attached. This works in conjunction withS3 todetermine narrow or wide device attachment.When there are no cablesattached, the jumpers are set to the default setting of OUTand the SCSIterminators are enabled for wide SCSI. This ensures that an adapterwithnothing attached has SCSI terminators enabled to pass diagnostics.FigureC-1. Jumper Locations and Default SettingsC-2 PCI SCSI-2 Fast/WideSingle-Ended Adapter Installation GuideSetting the Device TerminationSomedevices have built-in termination that are controlled by a DIP switch,jumper, orpush button. Other devices use terminators on a cable or on aconnector where aterminator is plugged. To determine if a device hasbuilt-in termination, refer to itsdocumentation.The following example showsthe default configuration for jumper block J7 on theSCSI adapter. Theadapter was shipped with the jumpers in this configuration.Thisconfiguration is for a single adapter on a SCSI chain. It allows theadapter to sensewhether it is at the end of a SCSI chain or in the middle ofa SCSI chain. Theadapter then enables or disables its built-in SCSIterminators as required.Typical installations use only one adapter and somenumber of internal or externalSCSI devices. In these cases the jumpers areleft in the factory-set default position.Default Position of Jumper BlockJ7For Automatic Termination selectionJumper J7 settings------------------s4s3 s2 s1out out out outIf the adapter is on one end of the SCSI chain, youmust provide a SCSI terminatorat the other end of the chain after the lastdevice. If the adapter is in the middle ofthe SCSI chain, you must provide aterminator at each end of the SCSI chain.Appendix C. Jumper Settings andMulti-Adapter Configurations C-3Figure C-2. SCSI Chain with Internal andExternal DevicesTerm is the SCSI terminator on the last device or the end ofthe cable.Try this linkhttp://publib16.boulder.ibm.com/pseries/en_US/infocenter/base/hardware_docs/pdf/a4a50bas.pdfEnjoy Eric."Dave (from the UK)" <see-my-s...@southminster-branch-line.org.uk>wrote in message news:444f...@212.67.96.135...> Does anyone know the function of the jumpers on an IBM FRU 93H3809 SCSIcard?>> This card as two internal connectors (50 and 68 pin) and one external one(68-pin). I want to connect it to a device externally that is 50 pins, via a68-> 50 cable.>> I'm hoping it might be possible to terminate the high byte only and leavethe low-byte unterminated. But with no information on the card, I don'tknow.>> --> Dave K MCSE.>> MCSE = Minefield Consultant and Solitaire Expert.>> Please note my email address changes periodically to avoid spam.> It is always of the form: month-year@domain. Hitting reply will work> for a couple of months only. Later set it manually.
Dave (from the UK)
> Does anyone know the function of the jumpers on an IBM FRU 93H3809 SCSI
> card?
>
> This card as two internal connectors (50 and 68 pin) and one external
> one (68-pin). I want to connect it to a device externally that is 50
> pins, via a 68-> 50 cable.
>
> I'm hoping it might be possible to terminate the high byte only and
> leave the low-byte unterminated. But with no information on the card, I
> don't know.
>
Thanks to Eric for providing the information. That is just what I
needed. I was unalbe to find that myself with a Google.
Sorry I am unable to reply under your text, but for some reason your
attempting to reply to your post causes Mozilla to crash on my Sun. So
I'm replying under my original message.