6951 International Standard OSI INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPTAHW3AUMA HO CTAHAAPTW3AUMWORGANISATION INTERNATIONALE DE NORMALISATION Information processing -- Processor system bus interface (Eurobus A) Traitementde I'information-- Bus d'interfaces entre processeurs (Eurobus A) First edition - 1986-12-15 ISO 6951-1986 (E) UDC 681.3.01 Ref.No.ISO 6951-1986 (E) connecting equipment, specifications,instructions Price based on 54 pages ed withoutlicense from IHS Not for Resale Foreword iSO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with iSO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6951 was prepared by Technical Committee ISO/TC 97. Informationprocessing systems. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. C) InternationalOrganizationforStandardization,1986 Printed in Switzerland ii nitted without license from IHS Not for Resale ISO6951-1986(E) Contents Page oIntroduction 1 Scope and field of application 2 2Definitions 3 3 Designation of a particular Eurobus 4 4 Compliance 5 Protocols for Eurobus A 4 6 Electrical and timing requirements 11 Annexes A Eurobus 10/A logical implementation 20 BEurobus 18/A logical implementation 20 C Eurobus 26/A logical implementation 20 D Eurobus 34/A logical implementation . 21 E Connector allocation 21 F Examples of application of protocol rules 24 GMethod of address allocation for mixed data widths . 40 H Example of Eurobus backplane construction . 43 J Mechanical option 1 : Forced air convection cooled double Eurocard . 43 K Extender panel . 48 Exampies of the appication of Eurobus A timing requirements 48 M Bus receiver a.c. noise rejection 52 N Test circuitand waveform fordetermination of transientsink current 53 P Publicationsreferredto 54 ii Copyright Intermational Organization for Standardization ed without license from IHS