Encoding:

SB32

000110

rt

base

offset

6

5

5

16

Format: 

SB rt, offset(base)

microMIPS

Store Byte

Purpose:

Store Byte

To store a byte to memory.

Description: 

 memory[GPR[base] + offset] = GPR[rt]

The least-significant 8-bit byte of GPR rt is stored in memory at the location specified by the effective address. The

16-bit signed offset is added to the contents of GPR base to form the effective address.

Restrictions:

None

Operation: 

vAddr = sign_extend(offset) + GPR[base]
(pAddr, CCA) = AddressTranslation (vAddr, DATA, STORE)
pAddr = pAddrPSIZE-1..3 || (pAddr2..0 xor ReverseEndian3)
bytesel = vAddr2..0 xor BigEndianCPU3
datadoubleword = GPR[rt]63-8*bytesel..0 || 08*bytesel
StoreMemory (CCA, BYTE, datadoubleword, pAddr, vAddr, DATA)

Exceptions:

TLB Refill, TLB Invalid, TLB Modified, Bus Error, Address Error, Watch