JPH01144927U - - Google Patents
Info
- Publication number
- JPH01144927U JPH01144927U JP4065188U JP4065188U JPH01144927U JP H01144927 U JPH01144927 U JP H01144927U JP 4065188 U JP4065188 U JP 4065188U JP 4065188 U JP4065188 U JP 4065188U JP H01144927 U JPH01144927 U JP H01144927U
- Authority
- JP
- Japan
- Prior art keywords
- scsi
- bus
- scsi bus
- power
- switching means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Small-Scale Networks (AREA)
Description
第１図〜第４図は本考案のＳＣＳＩシステムの
一実施例を示す図であり、第１図はそのＳＣＳＩ
システムのブロツク図、第２図はそのＳＣＳＩバ
スと終端回路との関係を示す回路図、第３図はそ
の終端回路への供給電源の切換を行う切換手段（
リレー）部分の回路図、第４図はその切換手段（
リレー）と選択手段（ビツトスイツチ）部分の回
路図である。第５図は本考案のＳＣＳＩシステム
の他の実施例の切換手段（リレー）と選択手段（
ＣＰＵ）部分を示す回路図である。
１……ＳＣＳＩシステム、２……ＳＣＳＩバス
、３〜１０……ＳＣＳＩ装置、２１……リレー（
切換手段）、２２……コントロール端子、｛２４
……ビツトスイツチ、３１……ＣＰＵ、３２……
バツフア｝選択手段、Ｌ０〜Ｌ１７……信号線、
Ｚａ，Ｚｂ……終端回路、Ｌｔ……ＴＥＲＭＰＷ
Ｒライン。
1 to 4 are diagrams showing one embodiment of the SCSI system of the present invention, and FIG. 1 shows the SCSI system of the present invention.
A block diagram of the system, Figure 2 is a circuit diagram showing the relationship between the SCSI bus and the termination circuit, and Figure 3 is a switching means for switching the power supply to the termination circuit.
Figure 4 shows the circuit diagram of the switching means (relay).
FIG. 2 is a circuit diagram of a relay) and a selection means (bit switch). FIG. 5 shows the switching means (relay) and selection means (relay) of another embodiment of the SCSI system of the present invention.
FIG. 2 is a circuit diagram showing a CPU portion. 1...SCSI system, 2...SCSI bus, 3-10...SCSI device, 21...relay (
switching means), 22...control terminal, {24
...bit switch, 31...CPU, 32...
Buffer} selection means, L 0 to L 17 ... signal line,
Z a , Z b ... Termination circuit, L t ... TERMPW
R line.
Claims (1)
装置がＳＣＳＩバス上で対となつてデータ交換を
行うＳＣＳＩシステムであつて、ＳＣＳＩバスが
信号線としてＳＣＳＩ装置間で所定の電力を供給
する電力線を有し、ＳＣＳＩ装置が所定の電力が
供給されると接続されているＳＣＳＩバスの線路
の整合性を向上させる終端回路と、該ＳＣＳＩ装
置がＳＣＳＩバス終端装置として接続されたとき
、該終端回路に供給する電源として該ＳＣＳＩ装
置の電源とＳＣＳＩバスの電力線とを択一的に選
択して接続する切換手段と、を有し、該切換手段
が、該ＳＣＳＩ装置に電源が投入されていないと
きには、ＳＣＳＩバスの電力線に接続し、ＳＣＳ
Ｉ装置に電源が投入されているときには、該ＳＣ
ＳＩ装置の電源あるいはＳＣＳＩバスの電力線の
いずれかに接続することを特徴とするＳＣＳＩシ
ステム。 (2) 前記ＳＣＳＩ装置が、電源の投入されてい
るときの前記切換手段による終端回路の接続相手
を選定する選択手段を備えたことを特徴とする請
求項１記載のＳＣＳＩシステム。[Claims for Utility Model Registration] (1) Multiple SCSIs connected to a SCSI bus
A SCSI system in which devices exchange data in pairs on a SCSI bus, where the SCSI bus has a power line serving as a signal line that supplies a predetermined amount of power between the SCSI devices, and the SCSI devices are supplied with a predetermined amount of power. and a termination circuit that improves the line integrity of the SCSI bus connected to the SCSI bus, and when the SCSI device is connected as a SCSI bus termination device, the power supply of the SCSI device and the SCSI bus serve as the power supply to the termination circuit. switching means for selectively connecting to the power line of the SCSI bus; when the SCSI device is not powered on, the switching means connects to the power line of the SCSI bus;
When the I device is powered on, the SC
A SCSI system characterized by being connected to either a power supply of an SI device or a power line of a SCSI bus. (2) The SCSI system according to claim 1, wherein the SCSI device includes selection means for selecting a connection partner of the termination circuit by the switching means when the SCSI device is powered on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4065188U JPH01144927U (en) | 1988-03-28 | 1988-03-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4065188U JPH01144927U (en) | 1988-03-28 | 1988-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01144927U true JPH01144927U (en) | 1989-10-05 |
Family
ID=31267118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4065188U Pending JPH01144927U (en) | 1988-03-28 | 1988-03-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01144927U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413992U (en) * | 1990-05-25 | 1992-02-04 |
-
1988
- 1988-03-28 JP JP4065188U patent/JPH01144927U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413992U (en) * | 1990-05-25 | 1992-02-04 |
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