Nec Network Controller uPD98502 Manuel d'utilisateur Page 503

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APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary Users Manual S15543EJ1V0UM
503
LBU
Load Byte Unsigned
LBU
base
LBU
1 0 0 1 0 0
rt offset
31 26 25 21 20 16 15 0
655 16
Format:
LBU rt, offset (base)
Description:
The 16-bit
offset
is sign-extended and added to the contents of general register
base
to form a virtual address.
The contents of the byte at the memory location specified by the effective address are zero-extended and loaded
into general register
rt
.
Operation:
32 T:
vAddr ((offset
15
)
16
|| offset
15..0
) + GPR [base]
(pAddr, uncached) AddressTranslation (vAddr, DATA)
pAddr p
Addr
PSIZE - 1..3
|| (pAddr
2..0
xor ReverseEndian
3
)
mem LoadMemory (uncached, BYTE, pAddr, vAddr, DATA)
byte vAddr
2..0
xor BigEndianCPU
3
GPR [rt] 0
24
|| mem
7 + 8* byte..8* byte
64 T:
vAddr ((offset
15
)
48
|| offset
15..0
) + GPR [base]
(pAddr, uncached) AddressTranslation (vAddr, DATA)
pAddr pAddr
PSIZE - 1..3
|| (pAddr
2..0
xor ReverseEndian
3
)
mem LoadMemory (uncached, BYTE, pAddr, vAddr, DATA)
byte vAddr
2..0
xor BigEndianCPU
3
GPR [rt] 0
56
|| mem
7 + 8* byte..8* byte
Exceptions:
TLB refill exception
TLB invalid exception
Bus error exception
Address error exception
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