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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure DEARG Define Extent CCW argument mapping
0000 0 Bitstring 32 DEDATA (0)
0000 0 Bitstring 1 DEMSKBTE Mask byte
11.. .... DEALLWRT X'C0' DEALLWRT Permit all write
commands
.1.. .... DEINHWRT X'40' DEINHWRT Inhibit all write
operations
1... .... DEUPDWRT X'80' DEUPDWRT Permit update
write operations only
.... .... DESOMWRT X'00' DESOMWRT Permit all write
operations exept write H and
write RO MASK BYTE BIT 2 is
reserved, must be 0 MASK BYTE
BITS 3-4
.... .... DEALLSK X'00' DEALLSK Permit all seek and
recalibrate commands
.... 1... DESKCHD X'08' DESKCHD Permit Seek
Cylinder and Seek Head only
...1 .... DESKHED X'10' DESKHED Permit Seek Head
only
...1 1... DEINHSK X'18' DEINHSK Inhibit all seek
commands & multitrack operations
MASK BYTE BITS 5-6 If non-zero,
control unit cache is bypassed.
.... .... DEAUTHNR X'00' DEAUTHNR Normal
authorization
.... ..1. DEAUTHDS X'02' DEAUTHDS Can access all
tracks, perform all Locate
Records (device support
authorization)
.... .1.. DEAUTHDG X'04' DEAUTHDG Diagnostic
authorization
.... .... DEAUTHID X'00' DEAUTHID Inhibit Data-Check
Correction and retry and device
support authorization MASK BYTE
BIT 7
.... ...1 DEPCIFTC X'01' DEPCIFTC PCI Fetch mode
MASK BYTE BITS 0-1
0001 1 Bitstring 1 DEGLATTR Global attributes
11.. .... DEGLECKD X'C0' DEGLECKD ECKD Global
attribute byte bit 2
..1. .... DEGLCONV X'20' DEGLCONV CKD conversion
mode Global attribute byte bits
3-5
.... .... DEGLCACH X'00' DEGLCACH Use normal cache
replacement
.... .1.. DEGLNOCA X'04' DEGLNOCA Bypass cache
.... 1... DEGLNCAL X'08' DEGLNCAL Inhibit cache
loading
.... 11.. DEGLSEQA X'0C' DEGLSEQA Sequential access
Global attribute byte bit 6
.... ..1. DEGLCFWR X'02' DEGLCFWR Use cache fast
write Global attribute byte bit 7
reserved
Global attribute byte bits 0-1
0002 2 Bitstring 2 DEBLKSZE Block size
0004 4 Bitstring 3 * Reserved Bytes 4-6
0007 7 Bitstring 1 DE7BYTE Byte 7
0008 8 Bitstring 2 DEBEGCYL Beginning of cylinder extent
000A 10 Bitstring 2 DEBEGHD Beginning of head extent
000C 12 Bitstring 2 DEENDCYL End of cylinder extent
000E 14 Bitstring 2 DEENDHD End of head extent
00000010 DENXRCL *-DEARG XRC not supported data
length
Extension of data area for XRC time stamping support
Bytes 16 through 23 (I/O time stamp)
0010 16 Bitstring 8 DETSTAMP Time stamp
00000018 DEXRCL *-DEARG XRC supported data length
Bytes 24 through 31 (reserved)
0018 24 Bitstring 8 DERSRVD Reserved for hardware use
00000020 DEARGLEN *-DEARG DEFINE EXTENT data area
length
00000040 DEPFXLEN 64 PREFIX LENGTH
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