DCWBK Back to Index page
 
Prolog 
Control Block Contents 
   DCWBK 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.


  DCWBK Prolog Top of page
  
 NAME       : HCPDCWBK
 DESCRIPTION: Device Command Word (DCW)
 DSECT      : DCWBK
 FUNCTION   : Provide symbolic reference to the fields of a
              Device Command Word (DCW) used by Fibre Channel
              Extensions (FCX)
 LOCATED BY : N/A
 CREATED BY : N/A
 DELETED BY : NA
 
 
  DCWBK Control Block Content Top of page
  




 DCWBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DCWBK          Device Command Word (DCW)
0000    0 Signed       4 DCWCFCT (0)    DCW first word - cmd, flag, and
                                        control data count
0000    0 Bitstring    1 DCWCMND        DCW Command Code
0001    1 Bitstring    1 DCWFLAG        DCW Flag byte
          .1.. ....      DCWCC          X'40' DCWCC Chain-Command (CC)
                                        flag All other bits reserved for
                                        IBM use
0002    2 Bitstring    1 DCWW0B2        Reserved for IBM use
0003    3 Bitstring    1 DCWCDCT        DCW Control Data Count
0004    4 Signed       4 DCWCNT         DCW Data Count (unsigned)
0008    8 Dbl-Word     8 DCWNEXT (0)    DCW following current DCW
          00000008       DCWBKBSZ       (*-DCWBK) DCW byte size
          00000001       DCWBKDSZ       (*-DCWBK+7)/8 DCW dword size
 
 
  DCWBK Storage Layout Top of page
  
          
*** DCWBK - Device Command Word (DCW)
*
*     +------+------+------+------+---------------------------+
*   0 |:CMND |:FLAG |:W0B2 |:CDCT |          DCWCNT           |
*     +------+------+------+------+---------------------------+
*
*** DCWBK - Device Command Word (DCW)
 
 
  DCWBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DCWBKBSZ       0008 00000008
DCWBKDSZ       0008 00000001
DCWCC          0001 40
DCWCDCT        0003
DCWCFCT        0000
DCWCMND        0000
DCWCNT         0004
DCWFLAG        0001
DCWNEXT        0008
DCWW0B2        0002
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:48:48 EDT.
Copyright IBM Corporation, 1990, 2022