Encoding:

EXTEND

11110

offset 10:5

offset 15:11

SB

11000

rx

ry

offset 4:0

5

6

5

5

3

3

5

Format: 

SB ry, offset(rx)

MIPS16e

Store Byte (Extended)

Purpose:

Store Byte (Extended)

To store a byte to memory.

Description: 

memory[GPR[rx] + offset] = GPR[ry]

The 16-bit offsetis sign-extended and then added to the contents of GPR rx to form the effective address. The leastsignificant byte of GP

ry is stored at the effective address.

Restrictions:

None

Operation: 

vAddr = sign_extend(offset) + GPR[Xlat(rx)]
(pAddr, CCA) = AddressTranslation (vAddr, DATA, STORE)
pAddr = pAddrPSIZE-1..2 || (pAddr1..0 xor ReverseEndian2)
bytesel = vAddr1..0 xor BigEndianCPU2
dataword = GPR[rt]31-8*bytesel..0 || 08*bytesel
StoreMemory (CCA, BYTE, dataword, pAddr, vAddr, DATA)

Exceptions:

TLB Refill, TLB I valid, TLB Modified, Bus Erro , Address Error