Nec Network Controller uPD98502 Manuel d'utilisateur Page 510

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Vue de la page 509
APPENDIX A MIPS III INSTRUCTION SET DETAILS
510
Preliminary Users Manual S15543EJ1V0UM
LDR
Load Doubleword Right (3/3)
LDR
Given a doubleword in a register and a doubleword in memory, the operation of LDR is as follows:
B C D E F GA H
J K L M N OI P
Register
Memory
LDR
vAddr2..0 Destination Type
Offset
(LEM)
0
1
2
3
4
5
6
7
IJKLMNOP
AIJKLMNO
ABI JKLMN
ABCI JKLM
ABCDI JKL
A BCDE I J K
A BCDEF I J
A BCDEFG I
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
Remark
LEM
Little-endian memory (BigEndianMem = 0)
Type
AccessType (see Table 2-3. Byte Specification Related to Load and Store Instructions)
sent to memory
Offset
pAddr2..0 sent to memory
Exceptions:
TLB refill exception
TLB invalid exception
Bus error exception
Address error exception
Reserved instruction exception (32-bit user mode/supervisor mode)
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