Altera Nios II User Manual page 182

8–2
R-type instructions include arithmetic and logical operations such as add and nor;
comparison operations such as cmpeq and cmplt; the custom instruction; and other
operations that need only register operands.
Table 8–2. R-Type Instruction Format
31 30 29 28 27 26 25
A
J-Type
J-type instructions contain:
■ A 6-bit opcode field
A 26-bit immediate data field
■
J-type instructions, such as call and jmpi, transfer execution anywhere within a
256-MB range.
Table 8–3. J-Type Instruction Format
31 30 29 28 27 26 25
Nios II Processor Reference Handbook
24 23 22 21 20 19 18 17
B C
24 23 22 21 20 19 18 17
IMM26
16 15 14 13 12 11 10 9
OPX
16 15 14 13 12 11 10 9
Chapter 8: Instruction Set Reference
Word Formats
8 7 6 5 4 3 2 1
OP
8 7 6 5 4 3 2 1
OP
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