NEDBK Back to Index page
 
Prolog 
Control Block Contents 
   NEDBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  NEDBK Prolog Top of page
  
 NAME       : HCPNEDBK
 DESCRIPTION: Node Element Descriptor Block
 DSECT      : NEDBK
 FUNCTION   : Describes the Contents of a Node Element
              Desciptor.
 LOCATED BY : CUITOKND - Pointer to the Token NED in an I/O
              Subsystem.  Other NEDs are linked using
              the Boeblingen Building Block N-ary Tree
              Structure.
 CREATED BY : HCPCDT - Configuration Data Table Services
 DELETED BY : None.
 SERIALIZED : This block will be serialized by the RDEV lock.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : Data map is hand drawn.
 
 
  NEDBK Control Block Content Top of page
  




 NEDBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      NEDBK          Node Element Descriptor Block
0000    0 Bitstring   32 NEDDATA (0)    Node Element Data
0000    0 Bitstring    1 NEDFLAGS       Flags.
          111. ....      NEDFNVAL       X'E0' NEDFNVAL Node-ID Validity.
                                        Describes the validity of the
                                        node ID in bytes 4-31.
          11.. ....      NEDFLDID       X'C0' NEDFLDID Field id = '11'b
          ..1. ....      NEDTOKEN       X'20' NEDTOKEN Token NED
                                        Indicator. If ON, the node
                                        described by this Node Element
                                        Descriptor (NED) is a Token NED.
          ...1 ....      NEDFTYP        X'10' NEDFTYP Node Type. If ON,
                                        the node described by this Node
                                        Element Descriptor (NED) is a
                                        Central Processing Complex (CPC)
                                        type node. If OFF, the node
                                        described by this NED is a Device
                                        Type node.
          .... 1...      NEDFINFT       X'08' NEDFINFT Interface Type. If
                                        ON, the attachable unit interface
                                        that determines this node is an
                                        internal interface. If OFF, the
                                        attachable unit interface that
                                        determines this node is an
                                        external interface.
          .... .1..      NEDFINFQ       X'04' NEDFINFQ Interface
                                        Qualifier. When (NEDFTYP = '1'B)
                                        & (NEDFINFT = '0'B) & (NEDFINFQ =
                                        '0'B) THEN the channel path
                                        interface has an associated
                                        CHPID. When (NEDFTYP = '1'B) &
                                        (NEDFINFT = '0'B) & (NEDFINFQ =
                                        '1'B) THEN the channel path
                                        interface has NO associated
                                        CHPID. For all other settings of
                                        flag bits 3 and 4, a zero in flag
                                        bit 5 has no meaning.
          .... ..1.      NEDFINVA       X'02' NEDFINVA Node ID is not
                                        valid. The CPC is not
          .... ...1      NEDFNCUR       X'01' NEDFNCUR Node ID is valid,
                                        but may not be current.
          .... ....      NEDFVALN       X'00' NEDFVALN Node ID is valid.
                                        able to obtain the requested node
                                        ID.
0001    1 Bitstring    3 NEDNPARM       Node Parameters.
0004    4 Bitstring    6 NEDTYPEN       TYPE NUMBER contains the EBCDIC
                                        type number (0-9) of the
                                        attachable unit.
000A   10 Bitstring    3 NEDMODN        Model Number contains the EBCDIC
                                        model number (0-9 or upper case
                                        A-Z) of the attachable unit.
000D   13 Bitstring    3 NEDMANUF       Manufacturer contains EBCDIC code
                                        (0-9 or upper-case A-Z) which
                                        identifies the manufacturer of
                                        the attachable unit e.g. "IBM".
0010   16 Bitstring    2 NEDPMANF       Plant of Manufacture contains
                                        EBCDIC code (0-9 or upper-case
                                        A-Z) which identifies the plant
                                        of manufacture for the attach-
                                        able unit.
0012   18 Bitstring   12 NEDSEQN (0)    Sequence Number.
0012   18 Bitstring    7 NEDSEQN1       Sequence Number contains the
                                        EBCDIC code (0-9 or upper-case
                                        A-Z) which identifies the first 7
                                        chars of the sequence number of
                                        the attachable unit.
0019   25 Bitstring    5 NEDSEQN2       Sequence Number contains the
                                        EBCDIC code (0-9 or upper-case
                                        A-Z) which identifies the last 5
                                        chars of the sequence number of
                                        the attachable unit.
001E   30 Bitstring    2 NEDTAG         Tag contains physical identifier
                                        for an interface of the
                                        attachable unit.
0020   32 Address      4 NEDSCPDT       NED Scope Function data which is
                                        used during the CDT Scope
                                        Function. Depending on the type
                                        of NED this block is used for,
                                        this filed will contain different
                                        data. If DNED, this field holds
                                        the RDEV address Otherwise, this
                                        field holds the CHPID list
                                        address.
              Field Redefinitions
0001    1 Bitstring    1 NEDTYPE        Type of NED
          00000001       NEDDEVND       X'01' NEDDEVND I/O device NED
          00000002       NEDCUNED       X'02' NEDCUNED Storage Control
                                        NED
0002    2 Bitstring    1 * (2)          Reserved for future IBM use.
0001    1 Bitstring    1 * (2)          Reserved for future IBM use.
0003    3 Bitstring    1 NEDCHPID       Channel Path ID.
        Node parameter definition for a SWITCH Node
        Descriptor obtained from a Store Event Info
        CHSC after a link incident CRW was stored.
0001    1 Bitstring    1 *              Reserved for future IBM use.
0002    2 Bitstring    1 NEDCLASS       I/O Device Class
          .... 1.1.      NEDSWICH       X'0A' NEDSWICH Switch
0003    3 Bitstring    1 NEDLINKA       Link Address
0020   32 Address      4 NEDRDEV        RDEV address if Device NED
0020   32 Address      4 NEDCHPTR       Otherwise, CHPID list pointer
0024   36 Address      4 NEDMPPTR       Pointer to a BBLX linked list of
                                        multiparent NEDBK addresses.
            Mappings for NEDTAG
      For a Volume NED
001E   30 Bitstring    1 NEDLCU         ESCON Logical CU number.
001F   31 Bitstring    1 NEDUA          Unit address of the Volume.
          00000005       NEDSIZE        (*-NEDBK+7)/8 Size of NEDBK in
                                        doublewords.
          00000028       NEDLEN         (*-NEDBK) Size of NEDBK in bytes.
 
 
  NEDBK Storage Layout Top of page
  
          
*** NEDBK - Node Element Descriptor Block
*
*     +------+--------------------+---------------------------+
*   0 |:FLAGS|     NEDNPARM       |        NEDTYPEN-          |
*     +------+------+-------------+------+--------------------+
*   8 |   -(004)    |      NEDMODN       |     NEDMANUF       |
*     +-------------+--------------------+--------------------+
*  10 |  NEDPMANF   |               NEDSEQN1-                 |
*     +------+------+---------------------------+-------------+
*  18 |-(012)|            NEDSEQN2              |   NEDTAG    |
*     +------+--------------------+-------------+-------------+
*  20 |         NEDSCPDT          |///////////////////////////|
*     +---------------------------+---------------------------+
*  28
*
*** NEDBK - Node Element Descriptor Block
          
*** Overlay for NEDNPARM in NEDBK
*
*            +------+-------------+
*   0 ..   1 |:TYPE |/////////////| 4
*            +------+-------------+
*
*** Overlay for NEDNPARM in NEDBK
          
*** Overlay for NEDNPARM in NEDBK
*
*            +-------------+------+
*   0 ..   1 |/////////////|:CHPID| 4
*            +-------------+------+
*
*** Overlay for NEDNPARM in NEDBK
          
*** Overlay for NEDNPARM in NEDBK
*
*            +------+------+------+
*   0 ..   1 |//////|:CLASS|:LINKA| 4
*            +------+------+------+
*
*** Overlay for NEDNPARM in NEDBK
          
*** Overlay for NEDSCPDT in NEDBK
*
*     +---------------------------+
*  20 |         NEDRDEV           | 24
*     +---------------------------+
*
*** Overlay for NEDSCPDT in NEDBK
          
*** Overlay for NEDSCPDT in NEDBK
*
*     +---------------------------+---------------------------+
*  20 |         NEDCHPTR          |         NEDMPPTR          |
*     +---------------------------+---------------------------+
*  28
*
*** Overlay for NEDSCPDT in NEDBK
          
*** Overlay for NEDTAG in NEDBK
*
*                                               +------+------+
*  18 ...                                    1E |NEDLCU|NEDUA |
*                                               +------+------+
*  20
*
*** Overlay for NEDTAG in NEDBK
 
 
  NEDBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
NEDCHPID       0003
NEDCHPTR       0020
NEDCLASS       0002
NEDCUNED       0001 00000002
NEDDATA        0000
NEDDEVND       0001 00000001
NEDFINFQ       0000 04
NEDFINFT       0000 08
NEDFINVA       0000 02
NEDFLAGS       0000
NEDFLDID       0000 C0
NEDFNCUR       0000 01
NEDFNVAL       0000 E0
NEDFTYP        0000 10
NEDFVALN       0000 00
NEDLCU         001E
NEDLEN         001F 00000028
NEDLINKA       0003
NEDMANUF       000D
NEDMODN        000A
NEDMPPTR       0024
NEDNPARM       0001
NEDPMANF       0010
NEDRDEV        0020
NEDSCPDT       0020
NEDSEQN        0012
NEDSEQN1       0012
NEDSEQN2       0019
NEDSIZE        001F 00000005
NEDSWICH       0002 0A
NEDTAG         001E
NEDTOKEN       0000 20
NEDTYPE        0001
NEDTYPEN       0004
NEDUA          001F
 
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:55:01 EDT.
Copyright IBM Corporation, 1990, 2013