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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure DFDA FBA Define Extent data area
0000 0 Bitstring 16 DFDAREA (0) FBA Define extent data area
Byte 0 (Mask byte)
Although defined as BITs, the contents of the
mask byte are, architecturally, multiple codes.
0000 0 Bitstring 1 DFDMASK Mask
11.. .... DFDMWC X'C0' DFDMWC Mask byte, bits 0
and 1 ------- Codes for use with
DFDMWC
.... .... DFDMWCNF X'00' DFDMWCNF Non-formatting
write permitted, formatting wirte
inhibited
.1.. .... DFDMWCIW X'40' DFDMWCIW Inhibit all write
operations
1... .... DFDMWCRS X'80' DFDMWCRS Reserved
11.. .... DFDMWCPA X'C0' DFDMWCPA Permit all write
commands
..1. .... DFDMB2 X'20' Mask, bit 2 (not used)
zeroes
...1 .... DFDMB3 X'10' Mask, bit 3 (not used)
zeroes
.... 1... DFDMB4 X'08' Mask, bit 4 ------- Codes
for use with DFDMB4
.... .... DFDMB4DA X'00' Data area
.... 1... DFDMB4ND X'08' Non-data area
.... .11. DFDMB5 X'06' Mask byte, bit 5 -------
Codes for use with DFDMB5
.... .... DFDMB5ID X'00' Inhibit diagnostic commands
.... .11. DFDMB5PD X'06' Permit diagnostic commands
.... ..11 DFDMB6 X'03' Mask byte, bits 6 and 7
------- Codes for use with DFDMB6
.... .... DFDMB6CE X'00' CE area
.... ...1 DFDMB6S1 X'01' Subsystem 1 area
.... ..1. DFDMB6S2 X'02' Subsystem 2 area
.... ..11 DFDMB6RS X'03' Reserved
Byte 1 (must be zero)
0001 1 Bitstring 1 DFDZERO Reserved, must be zero
Bytes 2 and 3 (block size)
0002 2 Bitstring 2 DFDBLKSZ Block size in bytes
Bytes 4 through 7 (Extent Locator)
0004 4 Bitstring 4 DFDEXTLC Extent Locator for this extent
Bytes 8 through 11 (beginning extent address)
0008 8 Bitstring 4 DFDBXBEG Beg extent address in block
number
Bytes 12 through 15 (ending extent address)
000C 12 Bitstring 4 DFDEXEND Ending extent block number
Length equates
00000010 DFDBSIZE *-DFDAREA Size of DFDA in bytes
00000002 DFDSIZE ((*-DFDAREA)+7)/8 Size of DFDA in
DWs
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