Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### S1CCW

Prolog

Control Block Contents
S1CCW DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### S1CCW Prolog

     NAME       : HCPS1CCW
     DESCRIPTION: SPOOLing Format 1 Channel Control
                  Word Pairs
     DSECT      : S1CCW
     FUNCTION   : Provide symbolic references for the fields of
                  the format 1 (XA) CCW pairs used by spooling
                  in the spool files.
     LOCATED BY : N/A
     CREATED BY : N/A
     DELETED BY : N/A

#### S1CCW Control Block Content

#### S1CCW DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      S1CCW          SPOOLing Format 1 Channel Control
    0000    0 Bitstring   16 S1CCWPAR (0)   FORMAT 1 (System 370/XA CCW Pair)
    0000    0 Signed       4 S1CCWWD0 (0)   First word of the CCW pair
    0000    0 Bitstring    1 S1CCWCMD       CCW command code
    0001    1 Bitstring    1 S1CCWFLG       Control of CCW flags
              1... ....      CCWDC          X'80' CCWDC CHAIN DATA ADDRESS
                                            AND COUNT
              .1.. ....      CCWCC          X'40' CCWCC COMMAND CHAIN
              ..1. ....      CCWSILI        X'20' CCWSILI SUPPRESS INCORRECT
                                            LENGTH
              ...1 ....      CCWSKIP        X'10' CCWSKIP SUPPRESS INBOUND
                                            DATA TRANSFER
              .... 1...      CCWPCIR        X'08' CCWPCIR REQUEST PC
                                            INTERRUPTION
              .... .1..      CCWIDA         X'04' CCWIDA INDIRECT DATA
                                            ADDRESSING
              .... ..11      CCWINVAL       X'03' CCWINVAL I/O UNDEFINED PAIR
                                            OF BITS
              .... ..1.      CCWSUSPN       X'02' CCWSUSPN I/O
                                            SUSPENSION/RESUMPTION The
                                            CCWUNDEF definition is left here
                                            because some code still uses this
                                            field where the CCWMIDA bit is
                                            not applicable.
              .... ...1      CCWUNDEF       X'01' CCWUNDEF I/O UNDEFINED BIT
              .... ...1      CCWMIDA        X'01' CCWMIDA
                                            Modified-CCW-indirect-data-addres
                                            sing
    0002    2 Signed       2 S1CCWCNT       Count for I/O
    0004    4 Address      4 S1CCWADR       CCW address (31-BIT)
    0008    8 Signed       4 S1CCWWD2 (0)   Third word of CCW pair
    0008    8 Bitstring    1 S1CCWTCC       CCW command code
    0009    9 Bitstring    1 S1CCWTCU (3)   No TIC flags or count For a
                                            format 1 CCW, this unused field
                                            of the TIC must be zero.
    000C   12 Address      4 S1CCWTCA       CCW address (31-BIT)
    0010   16 Dbl-Word     8 S1CCWDAT (0)   Start of variable length data
              00000010       S1CCWLEN       (*-S1CCW) Length of a FORMAT 1
                                            CCW pair in bytes
                 S1CCWOL is a 2 byte field used to contain the
                 original data length for CCWs which have had
                 blanks compressed from the data.  This field is
                 nonexistent for CCWs in which compression does not
                 occur.
                 The exception is TAG processing which always has
                 the original data length appended to the end of
                 the tag data field.
                 S1CCWOL is located following the data.
                 However, direct addressability cannot be achieved
                 due to the preceding variable length data field.
    0010   16 Bitstring    2 S1CCWOL        Value of the original data length

#### S1CCW Storage Layout

    *** S1CCW - SPOOLing Format 1 Channel Control
    *
    *     +------+------+-------------+---------------------------+
    *   0 |:CWCMD|:CWFLG|  S1CCWCNT   |         S1CCWADR          |
    *     +------+------+-------------+---------------------------+
    *   8 |:CWTCC|     S1CCWTCU       |         S1CCWTCA          |
    *     +------+------+-------------+---------------------------+
    *  10 |  S1CCWOL    | 12
    *     +-------------+
    *
    *** S1CCW - SPOOLing Format 1 Channel Control

#### S1CCW Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    CCWCC          0001 40
    CCWDC          0001 80
    CCWIDA         0001 04
    CCWINVAL       0001 03
    CCWMIDA        0001 01
    CCWPCIR        0001 08
    CCWSILI        0001 20
    CCWSKIP        0001 10
    CCWSUSPN       0001 02
    CCWUNDEF       0001 01
    S1CCWADR       0004
    S1CCWCMD       0000
    S1CCWCNT       0002
    S1CCWDAT       0010
    S1CCWFLG       0001
    S1CCWLEN       0010 00000010
    S1CCWOL        0010
    S1CCWPAR       0000
    S1CCWTCA       000C
    S1CCWTCC       0008
    S1CCWTCU       0009
    S1CCWWD0       0000
    S1CCWWD2       0008

This information is based on z/VM V6R1.0. Last updated on 18 Feb 2010 at 09:16:37 EDT.
Copyright IBM Corporation, 1990, 2008