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 7.2.0 Last updated on 24 Jun 2020 at 09:27:38 EDT.
Copyright IBM Corporation, 1990, 2020