Undefined Instruction; Instruction Cycle Times; Assembler Syntax - Samsung S3C2501X User Manual

INSTRUCTION SET S3C2501X

3.17 UNDEFINED INSTRUCTION

The instruction is only executed if the condition is true. The various conditions are defined in Table 3-2. The
instruction format is shown in Figure 3-28.
31 28 27 25 24 5 4 3 0
xxxxxxxxxxxxxxxxxxxx xxxx
011 1
Cond
Figure 3-28. Undefined Instruction
If the condition is true, the undefined instruction trap will be taken.
Note that the undefined instruction mechanism involves offering this instruction to any coprocessors which may
be present, and all coprocessors must refuse to accept it by driving CPA and CPB HIGH.

3.17.1 INSTRUCTION CYCLE TIMES

This instruction takes 2S + 1I + 1N cycles, where S, N and I are defined as sequential (S-cycle), non-sequential
(N-cycle), and internal (I-cycle).

3.17.2 ASSEMBLER SYNTAX

The assembler has no mnemonics for generating this instruction. If it is adopted in the future for some specified
use, suitable mnemonics will be added to the assembler. Until such time, this instruction must not be used.
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