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6

ULTRA2 SCSI LVD EXPANDER

2. Introduction

2.1 Overview

The Ultra2 SCSI LVD Expander is a Low Voltage Differential (LVD) 16-bit Wide
SCSI-bus extender. The Expander effectively divides the SCSI bus into two LVD or
SE (single-ended) segments—one segment connected to each of its two ports. The
Expander translates signals, and facilitates communication, between the segments.

When used in conjunction with an Ultra2 SCSI host adapter, the Expander

maintains backward compatibility with previous generations of devices on single-
ended segments, while retaining optimal performance and maximum cable length
of LVD. The Expander can also be used with an Ultra SCSI (“SCSI-3,” 40-MB-per-
second) host adapter to add Ultra2 devices to its bus and increase cable lengths.
Because it performs only signal-level translation, the Expander operates
transparently; users will hardly know it’s there. It places no limits on the quantity or
location of SCSI devices beyond the normal limits of the SCSI specification.

The Expander’s ports are “multimode,” meaning they can operate in single-

ended or LVD mode. (This selection is controlled automatically by a sensing signal
[DIFFSENSE] provided by the SCSI devices on the bus. As soon as you connect it
to the bus, the Expander will autoconfigure its ports as necessary.) Because of this,
you can use the Expander to effectively double the length of a single-ended SCSI
bus, or to access LVD peripherals farther away from your host adapter than the
normal maximum of 12 m (40 ft.). You can also connect two Expanders point-to-
point across as much as 24 m (80 ft.) of cable, as long as there aren’t any other
SCSI devices in-line between them.

Содержание IC540A

Страница 1: ... 877 BBOX FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com AUGUST 2000 IC540A Ultra 2 SCSI LVD Expander Ultra2 SCSI LVD Multimode Extender ...

Страница 2: ... can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult an experienced radio TV technician for ...

Страница 3: ... aparato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso La co...

Страница 4: ...r una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de poder o ...

Страница 5: ...3 Observing the Internal LEDs 14 4 Installation 15 4 1 Connecting the SCSI Bus Cables 15 4 2 Connecting AC Power and Observing the External LEDs 16 5 Applications 17 5 1 Applications That Will Work 17 5 2 Applications That Won t Work 19 6 Troubleshooting 20 6 1 Calling Black Box 20 6 2 Shipping and Packaging 20 Appendix A Port Pinouts 21 A 1 Low Voltage Differential LVD Pinout 21 A 2 Single Ended ...

Страница 6: ... per second Maximum Distance Extends LVD SCSI bus as far as 25 m 82 ft with a single unit farther with daisychained units User Controls 4 Internal jumpers for termination additional internal jumpers are reserved Indicators LEDs 2 Front mounted Power and Busy 5 Internal 4 Bus Type 1 Busy An additional internal LED is reserved Connectors 2 Micro D68 female see Appendix A for pinouts Power 110 to 220...

Страница 7: ...us and increase cable lengths Because it performs only signal level translation the Expander operates transparently users will hardly know it s there It places no limits on the quantity or location of SCSI devices beyond the normal limits of the SCSI specification The Expander s ports are multimode meaning they can operate in single ended or LVD mode This selection is controlled automatically by a...

Страница 8: ...ing with Figure 2 1 shows a typical Expander application If you d like to examine a block diagram of the Expander refer to Appendix B Figure 2 1 One SCSI bus with two physical segments Using an Expander to access legacy single ended devices with an LVD host adapter Single Ended Segment Single Ended Devices LVD Devices Ultra2 SCSI LVD Host Adapter Ultra2 SCSI LVD Expander LVD Segment ...

Страница 9: ...at extends your single ended bus Can be daisychained to achieve even higher distances Transparent operation requires no software and no SCSI ID Supports arbitration parity disconnect reconnect and sync or async data transfer Can act as either a target or initiator on either connected SCSI bus segment LEDs show power status and bus activity at all times Can optionally provide TERMPWR terminator pow...

Страница 10: ...ile the unit is ON Conversely even while the Expander is OFF you need to avoid damaging its circuit board with static electricity If possible stand on an anti static mat when you open the Extender and wear anti static gloves or wrist straps At the very least ground yourself before you open the Expander by touching something metal Take these steps to open the Expander 1 Use a small Phillips head sc...

Страница 11: ...e external LED will be connected to the right hand post on JP8 and the two wires going to the external LED will be connected to JP7 All other jumper posts will be empty Jumper posts JP1 JP4 JP9 and JP12 control termination their possible settings are described in Section 3 1 Jumper posts JP7 and JP8 form the electrical connection to the external Busy LED don t disturb this connection The other jum...

Страница 12: ...ed bus starts or vice versa leave both of these jumpers installed For each port into which you will be plugging two cables through a three connector adapter not a stub cable so that the SCSI bus segment will pass through that port remove the jumper If a segment will pass through Port A remove the jumper from JP9 If a segment will pass through Port B remove the jumper from JP4 Example For applicati...

Страница 13: ...pander Ultra2 SCSI LVD Expander Ultra2 SCSI LVD Expander Ultra2 SCSI LVD Expander Bus B JP9 ON JP9 OFF JP9 OFF JP4 OFF JP4 ON JP4 ON Bus A Bus A Bus B Multiconnector ribbon cable Multiconnector ribbon cables Bus A Bus A Tape drive Disk drive Disk drive Host adapter Host adapter Host adapter DVD ROM drive Disk drive Host adapter Termination enabled Termination enabled Termination Enabled Terminatio...

Страница 14: ...It s easy to make mistakes when installing external SCSI termination If you ll need to do so please call Black Box Technical Support to discuss your application If the remote termination for the segments that will be attached to the Expander can be handled with another device s internal terminator or with an external terminator that gets its TERMPWR from some other device s you can leave jumper po...

Страница 15: ...nded mode D2 When lit Port B is operating in LVD mode D3 Reserved for factory testing D4 When steadily dark either the Expander is OFF or not receiving power or there is continuous heavy traffic on the attached SCSI bus segments When steadily lit the Expander is ON but there is no activity on the SCSI bus When flickering the Expander is ON and there is a normal amount of traffic on the attached SC...

Страница 16: ... adapter or cable must be wired so that it does not contain a stub does not branch stubbing branching will cause your SCSI bus to fail Instead the cable or adapter should be constructed so that all of the wires run from one connector to the next to the next and so on in sequence For LVD T connections we suggest our 7 connector LVD ribbon cable product code EVMSCC22 For single ended T connections w...

Страница 17: ...us operation The Expander s Power LED is easy to spot even when it s dark there is a special cutout for it in the lower right hand corner of the front panel The amber Busy LED isn t so easy to see when it s not lit it s embedded in the venting in the front panel s upper right hand corner However the Busy LED will begin flashing as soon as data begins flowing on either attached SCSI bus segment Dur...

Страница 18: ...oth ends Figure 5 1 shows how to use an Expander to extend an Ultra SCSI SCSI 3 bus beyond its normal distance limits to reach faraway LVD devices Figure 5 1 Extending an Ultra SCSI bus Ultra2 SCSI LVD Expander JP4 ON JP9 OFF Multiconnector ribbon cable Bus B 32 bit PCI bus Bus A SE LVD Ultra SCSI host adapter Termination enabled Termination enabled LVD devices max cable 12 m 40 ft top data rate i...

Страница 19: ...for SE segments still apply to the segments at either end of this Extender to Extender link Figure 5 2 Adding maximum LVD point to point cabling Ultra2 SCSI LVD Expander JP4 ON JP9 OFF Two Ultra2 SCSI LVD Expanders with all ports terminated and an LVD SCSI cable between them up to 25 m 82 ft long Multiconnector ribbon cable Bus B 3 m 10 ft max 3 m 10 ft max 32 bit PCI bus Bus A LVD SE SE SE LVD Ul...

Страница 20: ...ers through which SCSI data can pass Figure 5 4 An application with too many Expanders Applications like that shown in Figure 5 5 won t work either because you can t have two LVD segments connected by a SE segment The two LVD devices would attempt to communicate at 40 MHz a transfer rate not supported by the SE segment and the system would fail Figure 5 5 An application with an SE segment between ...

Страница 21: ...u have a complete description including the nature and duration of the problem when the problem occurs the components involved in the problem that is what type of cable SCSI host adapter SCSI devices etc any particular application that when used appears to create the problem or make it worse and the results of any testing you ve already done 6 2 Shipping and Packaging If you need to transport or s...

Страница 22: ...gnals when you use flat ribbon cable A 1 Low Voltage Differential LVD Pinout Signal Pin Wire No Wire No Pin Signal Name No in Cable in Cable No Name DB 12 1 1 2 35 DB 12 DB 13 2 3 4 36 DB 13 DB 14 3 5 6 37 DB 14 DB 15 4 7 8 38 DB 15 DB P1 5 9 10 39 DB P1 DB 0 6 11 12 40 DB 0 DB 1 7 13 14 41 DB 1 DB 2 8 15 16 42 DB 2 DB 3 9 17 18 43 DB 3 DB 4 10 19 20 44 DB 4 DB 5 11 21 22 45 DB 5 DB 6 12 23 24 46 ...

Страница 23: ...n Cable in Cable No Name BSY 23 45 46 57 BSY ACK 24 47 48 58 ACK RST 25 49 50 59 RST MSG 26 51 52 60 MSG SEL 27 53 54 61 SEL C D 28 55 56 62 C D REQ 29 57 58 63 REQ I O 30 59 60 64 I O DB 8 31 61 62 65 DB 8 DB 9 32 63 64 66 DB 9 DB 10 33 65 66 67 DB 10 DB 11 34 67 68 68 DB 11 ...

Страница 24: ...7 13 14 41 DB 1 RETURN 8 15 16 42 DB 2 RETURN 9 17 18 43 DB 3 RETURN 10 19 20 44 DB 4 RETURN 11 21 22 45 DB 5 RETURN 12 23 24 46 DB 6 RETURN 13 25 26 47 DB 7 RETURN 14 27 28 48 DB P GROUND 15 29 30 49 GROUND GROUND 16 31 32 50 GROUND TERMPWR 17 33 34 51 TERMPWR TERMPWR 18 35 36 52 TERMPWR RESERVED 19 37 38 53 RESERVED GROUND 20 39 40 54 GROUND RETURN 21 41 42 55 ATN GROUND 22 43 44 56 GROUND RETUR...

Страница 25: ...PANDER Signal Pin Wire No Wire No Pin Signal Name No in Cable in Cable No Name RETURN 29 57 58 63 REQ RETURN 30 59 60 64 I O RETURN 31 61 62 65 DB 8 RETURN 32 63 64 66 DB 9 RETURN 33 65 66 67 DB 10 RETURN 34 67 68 68 DB 11 ...

Страница 26: ...h the internal logic of the Expander which takes care of cleaning up the signals as well as translating any differences between the buses The Expander contains logic to control the signal flow between the two SCSI ports It also has filtering and delay circuits to remove false edges from the REQ and ACK signals This logic enables the bus segments to be in the same SCSI bus state after a short delay...

Страница 27: ...D SEL LVD DATA AND PARITY LVD CD LVD MSG LVD I O LVD ATN LVD REQ LVD ACK LVD RST LVD BSY LVD SEL LVD DATA AND PARITY LVD CD LVD MSG LVD I O LVD ATN LVD REQ LVD ACK Port A Port B Bus Control Mode Logic Bus Control Mode Logic Bus Control Mode Logic Information Transfer Logic REQ ACK Filtering Data Retiming ...

Страница 28: ...L INFORMATION DISCLAIMERS Information in this manual is subject to change without notice The manufacturer and its agents assume no responsibility for errors appearing in or information omitted from this manual ...

Страница 29: ...NOTES ...

Страница 30: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2000 Black Box Corporation All rights reserved ...

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