TCAT | Back to Index page

| Prolog Control Block Contents TCAT 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.

TCAT Control Block Content | Top of page

     TCAT DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      TCAT           FCX Transport Command Control Block
    0000    0 Bitstring    4 TCATW0RS       Reserved for IBM use
    0004    4 Signed       4 TCATCNT        Transport Count (unsigned) Or
                                            Write count for bidirectional
                                            data transfer
    0008    8 Signed       4 TCATRCNT       Read count (only included in TCAT
                                            for bidirectional data transfer)
              0000000C       TCATBSZ        *-TCAT Length of TCA trailer
              000000F0       TCAMAX         240
              00000004       TCWLMIN        TCATCNT-TCAT Min TCWTCCBL
                                            (TCWW1B1)
              000000F4       TCWLMAX        TCAMAX+TCWLMIN Max TCWTCCBL
                                            (TCWW1B1)
              0000000C       TCALMIN        (TCADCW-TCASAC)+(TCATCNT-TCAT)
                                            Min TCALEN
              000000FC       TCALMAX        TCAMAX+TCALMIN Max TCALEN
              0000010C       TCCBMXSZ       TCCBEND-TCCBK Max byte size of
                                            TCCB
              00000022       TCCBMXDW       (TCCBMXSZ+7)/8 Max dword size of
                                            TCCB

TCAT Storage Layout | Top of page

    *** TCAT - FCX Transport Command Control Block
    *
    *     +---------------------------+---------------------------+
    *   0 |         TCATW0RS          |         TCATCNT           |
    *     +---------------------------+---------------------------+
    *   8 |         TCATRCNT          | C
    *     +---------------------------+
    *
    *** TCAT - FCX Transport Command Control Block

TCAT Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    TCALMAX        0008 000000FC
    TCALMIN        0008 0000000C
    TCAMAX         0008 000000F0
    TCATBSZ        0008 0000000C
    TCATCNT        0004
    TCATRCNT       0008
    TCATW0RS       0000
    TCCBMXDW       0008 00000022
    TCCBMXSZ       0008 0000010C
    TCWLMAX        0008 000000F4
    TCWLMIN        0008 00000004

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:31:12 EDT.
Copyright IBM Corporation, 1990, 2020