TCCBK Back to Index page
 
Prolog 
Control Block Contents 
   TCCBK 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.


  TCCBK Prolog Top of page
  
              Description: FCX Transport Command Control Block
              DSECT      : TCCBK
              Function   : Provide symbolic reference to the fields of a
              Transport Command Control Block used by Fibre
              Channel Extensions (FCX)
              Located by : N/A
              Created by : N/A
              Delete By  - N/A
 
 
  TCCBK Control Block Content Top of page
  




 TCCBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      TCCBK          FCX Transport Command Control Block
0000    0 Bitstring   16 TCAH (0)       Transport Command Area Header
0000    0 Bitstring    1 TCAFMT         Format
          0000007F       TCAFMT7F       X'7F' TCAFMT7F Format 7F
0001    1 Bitstring    3 TCAHW0RS       Reserved for IBM use
0004    4 Bitstring    3 TCAHW1RS       Reserved for IBM use
0007    7 Bitstring    1 TCALEN         TCA byte Length (20-252) Must be
                                        multiple of 4
0008    8 Signed       2 TCASAC         Service Action Code (unsigned)
          00001FFE       TCA1FFE        X'1FFE' TCA1FFE SAC 1FFE
          00001FFF       TCA1FFF        X'1FFF' TCA1FFF SAC 1FFF
000A   10 Bitstring    1 TCAHW2RS       Reserved for IBM use
000B   11 Bitstring    1 TCAPRI         Priority (0-255)
000C   12 Bitstring    4 TCAHW3RS       Reserved for IBM use
          00000010       TCAHBSZ        (*-TCAH) TCAH byte size
                                 *******************************-
                                 * Transport Command Area
                                 *******************************-
0010   16 Dbl-Word     8 TCADCW         1st DCW in TCA
0018   24 Bitstring    1 TCADCWDA (0)   Control data for first DCW
0018   24 Dbl-Word     8 TCADCW2        2nd DCW assuming first DCW has
                                        zero data length
0020   32 Bitstring    1 TCADCWD2 (0)   Control data for second DCW
0010   16 Bitstring    1 * (240)        Space for DCWs
0100  256 Bitstring    1 TCCBTCAT (12)  Space for bidirectional trailer
010C  268 Signed       2 TCCBEND (0)    End of TCCB
      The TCA Trailer is a fixed length data area located at the
      end of the variable length Transport Command Area.
      However, the TCAT is 2 words long for unidirectional I/O
      and 3 words long for bidirectional I/O.
 
 
  TCCBK Storage Layout Top of page
  
          
*** TCCBK - FCX Transport Command Control Block
*
*     +------+--------------------+--------------------+------+
*   0 |TCAFMT|     TCAHW0RS       |     TCAHW1RS       |TCALEN|
*     +------+------+------+------+--------------------+------+
*   8 |   TCASAC    |:HW2RS|TCAPRI|         TCAHW3RS          |
*     +-------------+------+------+---------------------------+
*  10 |                        TCADCW                         |
*     +-------------------------------------------------------+
*  18 |                       TCADCW2                         |
*     +-------------------------------------------------------+
*
*** TCCBK - FCX Transport Command Control Block
          
*** Overlay for TCADCW in TCCBK
*
*     +-------------------------------------------------------+
*  10 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
* 100 |                       TCCBTCAT                        |
*     |                           +---------------------------+
*     |                           |
*     +---------------------------+
*
*** Overlay for TCADCW in TCCBK
 
 
  TCCBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
TCADCW         0010
TCADCWDA       0018
TCADCWD2       0020
TCADCW2        0018
TCAFMT         0000
TCAFMT7F       0000 0000007F
TCAH           0000
TCAHBSZ        000C 00000010
TCAHW0RS       0001
TCAHW1RS       0004
TCAHW2RS       000A
TCAHW3RS       000C
TCALEN         0007
TCAPRI         000B
TCASAC         0008
TCA1FFE        0008 00001FFE
TCA1FFF        0008 00001FFF
TCCBEND        010C
TCCBTCAT       0100
 
This information is based on z/VM 7.4.0 Last updated on 24 Jun 2024 at 11:34:40 EDT.
Copyright IBM Corporation, 1990, 2024