Hi, all.
Here's the code in arm.isa file
---------------------------------------------------------------------
decode COND_CODE {
0xF: ArmUnconditional::armUnconditional();
default: decode ENCODING {
format DataOp {
    0x0: decode SEVEN_AND_FOUR {
        1: decode MISC_OPCODE {
            0x9: decode PREPOST {
                0:
ArmMultAndMultAcc::armMultAndMultAcc();
                1:
ArmSyncMem::armSyncMem();
            }
            0xb, 0xd, 0xf: AddrMode3::addrMode3();
        }
...
...
...
---------------------------------------------------------------------
In line 4, what's the key word "format" ? 
I've studied the site, ISA Parser, http://www.m5sim.org/ISA_Parser , but get no
idea about it. 
I know "decode COND_CODE" in line 1 is like a switch case and the contents
between the braces 
are the code will be generated.
Does anyone tell me what is format? Any hint will be appreciated.
Best
M.Y. Lin
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