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' CHAIN DATA ADDRESS AND
                                        COUNT
          .1.. ....      CCWCC          X'40' COMMAND CHAIN
          ..1. ....      CCWSILI        X'20' SUPPRESS INCORRECT LENGTH
          ...1 ....      CCWSKIP        X'10' SUPPRESS INBOUND DATA
                                        TRANSFER
          .... 1...      CCWPCIR        X'08' REQUEST PC INTERRUPTION
          .... .1..      CCWIDA         X'04' INDIRECT DATA ADDRESSING
          .... ..11      CCWINVAL       X'03' I/O UNDEFINED PAIR OF BITS
          .... ..1.      CCWSUSPN       X'02' I/O SUSPENSION/RESUMPTION
          .... ...1      CCWUNDEF       X'01' I/O UNDEFINED BIT
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
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