APPENDIX A MIPS III INSTRUCTION SET DETAILS
538 Preliminary Users Manual S15543EJ1V0UM
SB Store Byte SB
base

SB

1 0 1 0 0 0 rt offset

31 26 25 21 20 16 15 0
655 16
Format:
SB 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 least-significant byte of register
rt
is stored at the effective address.
Operation:
32 T: vAddr ((offset15)16 || offset15...0) + GPR [base]
(pAddr, uncached) AddressTranslation (vAddr, DATA)
pAddr pAddrPSIZE - 1...3 || (pAddr2...0 xor (ReverseEndian3))
byte vAddr2...0 xor BigEndianCPU3
data GPR [rt]63 8 * byte...0 || 08 * byte
StoreMemory (uncached, BYTE, data, pAddr, vAddr, DATA)
64 T: vAddr ((offset15)48 || offset15...0) + GPR [base]
(pAddr, uncached) AddressTranslation (vAddr, DATA)
pAddr pAddrPSIZE - 1...3 || (pAddr2...0 xor (ReverseEndian3))
byte vAddr2...0 xor BigEndianCPU3
data GPR [rt]63 8 * byte...0 || 08 * byte
StoreMemory (uncached, BYTE, data, pAddr, vAddr, DATA)
Exceptions:
TLB refill exception
TLB invalid exception
TLB modification exception
Bus error exception
Address error exception