Appendix C. Supplementary Application Information

***** 03F4 REQUESTS BEFORE INITIATING A SELECTION SEQUENCE • INITIAL SELECTION SEQUENCE HAS BEEN STARTED BY THE CHANNEL.

Flow Diagram 1. Initiation of Polling or Selection

Appendix C. Supplementary Application Infonnation C-l

NOTE 1 COMPLETES THE SIGNAL SEQUENCE FOR THIS CONTROL UNIT.

***** 02J2 OR ANOTHER SELECTION SEQUENCE.

Appendix C. Supplementary Application Information C-3

NOTE 1

ALL MENTION OF SELECT OUT ASSUMES PROPER OPERATION OF HOLD OUT AS WELL.

THUS. SELECT OUT UP MEANS SELECT OUT AND HOLD OUT UP. AND SELECT OUT DOWN MEANS EITHER SELECT OUT OR HOLD OUT DOWN.

NOTE 4

THE BYTE ON BUS OUT MUST HAVE BEEN VALID FOR AT LEAST 100 NSEC PRIOR TO THE RAISING OF THE OUT TAG.

NOTE 5

THE BYTE ON BUS IN MUST BE VALID WITHIN 100 NSEC AFTER THE RAISING OF THE IN TAG.

NOTE 6

THE BYTE ON BUS OUT NEED NOT BE VALID AFTER THE FALL OF THE IN TAG.

NOTE 7

THE BYTE ON BUS IN NEED NOT BE VALID AFTER THE RISE OF THE OUT TAG.

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: SELECT OUT :

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THE COMMAND AS REQUIRED.

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THE CONTROL UNIT PROCESSES

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H2 *. H3 *. ****"H4**"'·.******

.* *. .* *cu* *. .. "CU'" ..

NO.* "CU- *. NO.* STATUS *. YES ... STATUS BYTE ..

*. INBOUND . * < - - - * . ^TRANSFER . * - > * TO ...

*. DATA .* *. R E O . . * .. aus IN ..

* . . * * . . * ... ...

*. ....

i

^YES ... ... ^" *****************

NOTE 5 v I

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" OATA BYTE TO BUS IN

L-___________________________ > <: __________________ - - J

*****

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Flow Diagram 3. Command Transfer

C-4

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03 * •

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*. COMMAND • *

NOTE 5

THE BYTE ON BUS IN MUST BE VALID WITHIN 100 NSEC AFTER THE RAISING OF THE IN TAG.

Flow Diagram 4. Status/Data Presentation

*. OUT .*

*. .*

* •• *

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.* *CU* *. YES

*. SERVICE .*

tt. OUT .*

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i '"

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*. INITIATED .* '---~

*.SEQUENCE .* TRANSFER INITIAL

STATUS BYTE.

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* •• *

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-*. REQUEST .*

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NOTE 5 II

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* RAISE

* SERVICE IN

••• ** II

*06 *

* A4*

* * *

NOTE 5 II

*****H4********.*

* *

* *CU* *

* RAISE *

: STATUS IN :

•• ** •• *** •• ******

Appendix C. Supplementary Application Information C-5

1

Flow Diagram 5. Response to Status/Data Presentation

C-6 ASSUMES PROPER OPERATION OF HOLD OUT AS WELL. THUS.

THE STATUS IS ACCEPTED. INDICATED IF SUPPRESS OUT IS UP AT THE

Flow Diagram 6. Response to Stack/Stop/Accept

* *

*

*. .*

THE FALL OF OPERATIONAL IN COMPLETES THE CONTROL-UNIT PORTION OF THIS SIGNAL SEQUENCE.

Appendix C. Supplementary Application Information C-7

***** 07J3

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63 *.

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A CHANNEL MAY NEED TO TEMPORARILY HOLD UP DATA TRANSFER. IT MAY ACCOMPLISH THIS BY RAISING SUPPRESS OUT.

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.* ^CH) *. .* -.

." ATA *. YES .* (CH) *. YES

*. TRANSFER . * 1 *. OPERATIONAL .*

OPERATIONAL IN MUST FALL PRIOR TO DROPPING COMMAND OUT TO PREVENT THE STATUS FROM BEING PRESENTED AGAIN.

TO BE EFFECTIVE. SUPPRESS OUT MUST RISE AT LEAST 250 NSEC PRIOR TO THE FALL OF SERVICE OUT FOR THE PRECEDING BYTE.

*. STOPPED .* *. IN ."

*. .* *. .*

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(CH) DROP COMMAND OUT

*

* ..

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^{*** ••••• * •.•• * •• **}

THIS SIGNAL SEQUENCE IS COMPLETE. THE CHANNEL NOW WAITS FOR A NEW INITIAL SELECT I ON SEQUENCE OR A REQUEST FOR POLLING.

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F10\v Diagram 7. Response to Fall of Status/Service In

C-B

THE CHANNEL ASSUMES A BURST-TYPE SEQUENCE AND WAITS FOR FURTHER CONTROL-UNIT ACTIVITY.

NOTE 4 IS OPTIONALLY SUPPRESSABLE •

• \1.

ASSUMES PROPER OPERATION OF HOLD OUT AS WELL. THUS •

Flow Diagram 8. Burst Mode Waiting Loop

L-___________

^> SERVICE IN.

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Appendix C. Supplementary Application Information C-9

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Sequence Chart 1. Selector Channel Operation Appendix C. Supplementary Application Information C-ll

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Sequence Chart 2. Control Unit Forced Burst Mode - Multiplexer Channel Appendix C. Supplementary Application Information C-13

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A22·6843·3

International Business Machines Corporation Data Procellsing Division

112 East Pout Road, White Plains, N.Y.I060t [USA Only]

IBM World Trade Corporation

821 United Nations Plaza, New York, New York 10017 Iinternatiollal]

Im Dokument IBM System/360 I/O Interface Channel to Control Unit (Seite 37-52)