ISO/IEC PRF 24079
(Main)Information technology — Network Controller Sideband Interface (NC-SI) Specifications Collection
Information technology — Network Controller Sideband Interface (NC-SI) Specifications Collection
Technologies de l’information — Collection de spécifications pour l’interface entre contrôleur réseau et contrôleur de gestion système (NC-SI)
General Information
Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/IEC FDIS
ISO/IEC JTC 1
Information technology — Network
Secretariat: ANSI
Controller Sideband Interface (NC-
Voting begins on:
SI) Specifications Collection
2024-06-17
Voting terminates on:
2024-08-12
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Reference number
ISO/IEC FDIS 24079:2024(en) © ISO/IEC 2024
FINAL DRAFT
ISO/IEC FDIS 24079:2024(en)
International
Standard
ISO/IEC FDIS
ISO/IEC JTC 1
Information technology — Network
Secretariat: ANSI
Controller Sideband Interface (NC-
Voting begins on:
SI) Specifications Collection
Voting terminates on:
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO/IEC 2024
IN ADDITION TO THEIR EVALUATION AS
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
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TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ISO/IEC FDIS 24079:2024(en) © ISO/IEC 2024
© ISO/IEC 2024 – All rights reserved
ii
ISO/IEC FDIS 24079:2024(en)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members
of ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular �ields of technical activity. ISO and IEC
technical committees collaborate in �ields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
document should be noted (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent database
available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held responsible for
identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO speci�ic terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by DMTF [as DMFT Network Controller Sideband Interface (NC-SI) Speci�ications
Collection] and drafted in accordance with its editorial rules. It was adopted, under the JTC 1 PAS procedure,
by Joint Technical Committee ISO/IEC JTC 1, Information technology.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2024 – All rights reserved
iii
ISO/IEC FDIS 24079:2024(en)
Contents
Foreword . x
Introduction . xii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
3.1 Requirement term definitions . 3
3.2 NC-SI term definitions . 3
3.3 Numbers and number bases . 6
3.4 Reserved fields . 6
4 Symbols and abbreviated terms . 6
5 Network Controller Sideband Interface (NC-SI) Specification (DSP0222) . 8
5.1 NC-SI overview . 8
5.2 Operational behaviors . 13
5.3 Arbitration in configurations with multiple Network Controller packages . 33
5.4 Packet definitions . 43
5.5 Packet-based and op-code timing . 101
5.6 RBT Electrical specification . 103
6 Network Controller Sideband Interface (NC-SI) Collection (DSP0261) . 110
6.1 NC-SI over MCTP overview . 110
6.2 NC-SI over MCTP specific considerations . 112
6.3 Supported NC-SI commands. 121
6.4 Message types . 123
6.5 NC-SI support specific to MCTP transport . 127
6.6 Packet-Based Timing Specific to MCTP Binding . 130
ANNEX A (normative) Extending the model . 131
A.1 Commands extension . 131
A.2 Design considerations . 131
ANNEX B (informative) Relationship to RMII Specification . 132
ANNEX C (informative) Notation and conventions . 134
Bibliography . 135
© ISO/IEC 2024 – All rights reserved
iv
ISO/IEC FDIS 24079:2024(en)
Figures
Figure 1 – NC-SI func�onal block diagram . 9
Figure 2 – NC-SI traffic flow diagram . 9
Figure 3 – Example topologies supported by the NC-SI . 10
Figure 4 – Network Controller integra�on op�ons . 11
Figure 5 – NC-SI transport stack . 13
Figure 6 – NC-SI opera�onal state diagram . 17
Figure 7 – NC-SI opera�onal state diagram for hardware arbitra�on opera�on . 18
Figure 8 – MC steps when the MC does not have prior knowledge of hardware arbitra�on . 25
Figure 9 – NC-SI packet filtering flowchart . 30
Figure 10 – Basic mul�-drop block diagram . 34
Figure 11 – Mul�ple Network Controllers in a ring format . 35
Figure 12 – Op-code to RXD rela�onship . 37
Figure 13 – Example TOKEN to transmit rela�onship . 40
Figure 14 – Hardware arbitra�on state machine . 41
Figure 15 – Ethernet frame encapsula�on of NC-SI packet data without VLAN tag . 43
Figure 16 – Example NC-SI signal interconnect topology . 103
Figure 17 – DC measurements . 105
Figure 18 – AC measurements . 106
Figure 19 – Overshoot measurement . 108
Figure 20 – Undershoot measurement . 109
Figure 21 – NC-SI over RBT traffic flow diagram . 111
Figure 22 – NC-SI over MCTP traffic flow diagram . 112
Figure 23 – Single MCTP EID to mul�ple NC-SI channels mapping . 113
Figure 24 – Mul�ple MCTP EIDs to mul�ple NC-SI channels mapping . 114
Figure 25 – Mul�ple MCTP transport bindings example . 117
© ISO/IEC 2024 – All rights reserved
v
ISO/IEC FDIS 24079:2024(en)
Tables
Table 1 – Component documents . x
Table 2 – NC-SI opera�ng state descrip�ons . 14
Table 3 – Channel ID format . 19
Table 4 – Channel Ready state configura�on se�ngs . 20
Table 5 – Hardware arbitra�on di-bit encoding . 36
Table 6 – Hardware arbitra�on op-code format . 36
Table 7 – Hardware arbitra�on states .
...
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