NEC Network Controller uPD98502 - Manual (Page 537)

APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM 537
ORI
Or Immediate
ORI
rs
ORI
0 0 1 1 0 1
rt immediate
31 26 25 21 20 16 15 0
6 5 5 16
Format:
ORI rt, rs, immediate
Description:
The 16-bit immediate is zero-extended and combined with the contents of general register rs in a bit-wise logical
OR operation. The result is placed into general register rt.
Operation:
32 T: GPR [rt] ← GPR [rs]
31...16
|| (immediate or GPR [rs]
15...0
)
64 T: GPR [rt] ← GPR [rs]
63...16
|| (immediate or GPR [rs]
15...0
)
Exceptions:
None