Reference count set of experimental test instructions - Jane books , add some details.
1. Add bne instruction
Modify ctrl.v
After modifying mipstestloopjal_sim.asm, mars dump is bnetest.dat
Modify sccomp_tb
modelsim compilation, simulation. Signal Add sccomp_tb: u_ctrl -> i_bne, npc, pc
Visible i_bne control signal is 1, npc becomes 44. Add bne success
2. Add the jr instruction
Look at the format.
R type instruction.
Therefore, in ctrl.v modified as follows.
ctrl.v and two changes
Then modify the NPC.v. Note that adding parameters and input
= Reason RD1 visible sccpu.v
In ctrl_encode_def defined NPC_JR
Add parameters .RD1 in sccpu.v
Then write test procedures
$ Ra first assigned to 4. This should continue to cycle.
Export test
Do not forget to modify sccomp_tb
1c can be seen from the waveform diagram of PC 4 is set to change. Added successfully
3. Add JALR
ctrl.v
JAL R & lt instruction format is JAL R & lt RS
Save unconditional jump instruction specified by the register rs, and the address of the next instruction in register $ ra
Test code
14 seen from the jump 4,
And $ ra record 18
4. Add instruction NOR
In the alu.v
Test code
Waveform:
register:
5. Add instruction sll & sra & srl
Note that this extension done
Note also modify the width of the input ALUOp
Then in ctrl.v
Write register
Note that only changed RegWrite, RD did not change following
Add Output
In the sccpu.v
Test code:
Waveform: see ALUop correspond sll, srl, sra's 1000,1001,1010
Register value:
6.sllv and srlv
Here sllv using rs lower five write himself fifth stage of the CPU (3) - Logic MIPS instruction set, shift and space command - yxwkaifa - blog Park
sllv $t1，$t2，$t3。
则t1值为t2左移t3的低五位
但是这里不太懂，没搞明白是怎么实现的逻辑左右移，位数可变
这里犯了一次错误。复制粘贴后忘了改数字了
测试代码：
波形：
寄存器变化
7.stli指令
小于则置一
测试代码：
波形：
寄存器值：
8.lui指令
取高十六位
测试代码：
波形图：
寄存器值：
9.andi指令
别忘了RT
aluop同and
测试代码：
波形图：
寄存器：
以上。nice！
学号后八位排序
01510029
lui 0x0151
ori 0x0029
记得改sccomp_tb
跑完看result.txt
大概是完成了排序。