JPH0452254U - - Google Patents
Info
- Publication number
- JPH0452254U JPH0452254U JP9288890U JP9288890U JPH0452254U JP H0452254 U JPH0452254 U JP H0452254U JP 9288890 U JP9288890 U JP 9288890U JP 9288890 U JP9288890 U JP 9288890U JP H0452254 U JPH0452254 U JP H0452254U
- Authority
- JP
- Japan
- Prior art keywords
- bus
- switching
- initiator
- target device
- switched
- 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
- 239000003999 initiator Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Bus Control (AREA)
Description
第１図は本考案の一実施例を示す構成ブロツク
図、第２図は動作を示すフローチヤート、第３図
は従来のこの種のバス切換装置の一例を示す構成
概念図である。
１，２……イニシエータ、３……バス切換装置
、４……ターゲツト装置、３２……バスビジーフ
ラグ手段、３３……ＩＤ判断手段、３４……フエ
ーズ検出手段、３５……切換制御手段、３６……
使用中イニシエータＩＤ記憶手段、ＢＳ１〜ＢＳ
３……ＳＣＳＩバス、Ｒ……終端抵抗。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the operation, and FIG. 3 is a conceptual diagram showing an example of the structure of a conventional bus switching device of this type. 1, 2... Initiator, 3... Bus switching device, 4... Target device, 32... Bus busy flag means, 33... ID judgment means, 34... Phase detection means, 35... Switching control means, 36 ……
Initiator ID storage means in use, BS1 to BS
3...SCSI bus, R...terminal resistor.
Claims (1)
ニシエータにつながるＳＣＳＩバスをターゲツト
装置か、ＳＣＳＩバス終端抵抗のどちらかに接続
切換えるＳＣＳＩバス切換装置であつて、 セレクシヨンフエーズが否かを検出するフエー
ズ検出手段と、 セレクシヨンフエーズにおいて、イニシエータ
によつて指定されたＩＤが自分が切換えるバスに
割り付けてあるＩＤに一致するか否かを判断する
ＩＤ判断手段と、 ターゲツト装置に接続されるバスのビジー状態
を表示するバスビジーフラグ手段と、 ターゲツト装置がどのイニシエータによりアク
セスされているか（使用中）を記憶する使用中イ
ニシエータＩＤ記憶手段と、 ＩＤに一致する場合であつて、前記バスビジー
フラグ手段と使用中イニシエータＩＤ記憶手段の
ＩＤを参照し、バスの切換を制御する切換制御部
を設け、 前記切換制御部は、フエーズ検出手段がセレク
シヨンフエーズを検出し、ＩＤ判断手段が指定さ
れたＩＤが自分の担当するＩＤであることを判断
した場合、そのＩＤに従つて切換先を決定すると
共に、バスビジーフラグ手段が立つていない場合
にその切換えを実施し、使用中イニシエータＩＤ
記憶手段のＩＤを参照して、ターゲツト装置への
切換えを行つたイニシエータが終端抵抗側への切
換えを完了するまでは、他のイニシエータからの
バス切換え要求を受け付けないようにすることを
特徴とするＳＣＳＩバス切換装置。[Scope of Claim for Utility Model Registration] A SCSI bus switching device that, by specifying multiple initiators, switches the connection of the SCSI bus connected to these initiators to either a target device or a SCSI bus terminating resistor, wherein the selection phase is a phase detection means for detecting whether or not the bus is switched; an ID determination means for determining whether the ID specified by the initiator matches the ID assigned to the bus to be switched in the selection phase; and the target device. bus busy flag means for displaying the busy state of a bus connected to the target device; in-use initiator ID storage means for storing which initiator the target device is being accessed (in use); , a switching control section is provided for controlling bus switching by referring to the ID of the bus busy flag means and the in-use initiator ID storage means; When the determination means determines that the specified ID is the ID for which it is in charge, it determines the switching destination according to that ID, and if the bus busy flag means is not set, it performs the switching and uses it. Medium initiator ID
The present invention is characterized in that bus switching requests from other initiators are not accepted until the initiator that has switched to the target device completes switching to the terminating resistor side by referring to the ID in the storage means. SCSI bus switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9288890U JPH0452254U (en) | 1990-09-04 | 1990-09-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9288890U JPH0452254U (en) | 1990-09-04 | 1990-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452254U true JPH0452254U (en) | 1992-05-01 |
Family
ID=31829680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9288890U Pending JPH0452254U (en) | 1990-09-04 | 1990-09-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452254U (en) |
-
1990
- 1990-09-04 JP JP9288890U patent/JPH0452254U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0452254U (en) | ||
| JPH0452255U (en) | ||
| JPH02106749U (en) | ||
| JPH0325949U (en) | ||
| JPH0317807U (en) | ||
| JPS5926056U (en) | Defog device | |
| JPH03121905U (en) | ||
| JPS6387131U (en) | ||
| JPH02140153U (en) | ||
| JPH03121105U (en) | ||
| JPS5814015U (en) | Vehicle interior circulation air volume automatic control device | |
| JPS6429005U (en) | ||
| JPH0353062U (en) | ||
| JPS6189982U (en) | ||
| JPS61160599U (en) | ||
| JPH03130012U (en) | ||
| JPS6189981U (en) | ||
| JPH02144165U (en) | ||
| JPH02100621U (en) | ||
| JPH0462599U (en) | ||
| JPH01134522U (en) | ||
| JPS63195664U (en) | ||
| JPH0295424U (en) | ||
| JPH02105291U (en) | ||
| JPS63187488A (en) | Recording medium reproducer |