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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.
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