---
tags: RISCV, 伴學松, 伴學松活動記錄
---
# 從0到有製作自己的CPU！！ 第七周活動記錄 20220818

[TOC]

# 直播紀錄連結

{%youtube SwTbELYmL2g %}

## 出席

- [x] KIM_WENG
- [x] 名名
- [ ] chuan
- [x] bill503084699
- [ ] 楓糖
- [x] 謝祥辰
- [x] 黑貓
- [x] sixkwnp
- [ ] Bonki
- [x] ouo314
- [x] Willwho
- [x] GYLABA
- [x] mikuthebest
- [x] Penquuin
- [x] 葉子
- [ ] painCake
- [x] EZ4ENCE
- [ ] 頂漿汗腺
- [x] 角角
- [ ] adam chen
# 討論內容

1. branch跟jump指令實作(先 Jump ~~後 Branch~~)
2. 下週目標由第一組做 Jump

# 本周作業

# 討論重點
1. s type(save/store)
rs1 =b01 …
rs2 =b10 value =b100
rs1[imm +: 8]=
rs1[7:0]
[name= penquuin]

2. jump -UJ TYPE
IMM ,RD
PC +=IMM
RD =PC
[name= penquuin]
#### penquuin

//<@541602475640356875>

00200093 // 000000000010 00000 000 00001 0010011 -- put 2 in 00001
00208113 // 000000000010 00001 000 00010 0010011 -- add 00001(data = 2) and 2 -> store in 00010(data becomes 4)
00116463
// imm12 | imm 10:5 |                 | imm 4:1 | imm 11 |
// 0     | 000000   | 00001 00010 110 | 0100    | 0      | 1100011
// if data at 00010 is bigger than data at 00001 then jump from here to 8 (2 commands after)
// imm has been **left-shifted** by one, so putting 0100 at 4:1 actually
// assigns imm with the value 8 instead of 4
00300193 // 000000000011 00000 000 00011 0010011 -- put 3 in 00011
00400193 // 000000000100 00000 000 00011 0010011 -- put 4 in 00011 // jump to here!

//這是我測試B-Type的指令，等等可以用

#### 黑貓的code

    localparam  branch_beq  = 3'b000;
    localparam  branch_bne  = 3'b001;
    localparam  branch_blt  = 3'b010;
    localparam  branch_bge  = 3'b011;
    localparam  branch_bltu = 3'b110;
    localparam  branch_bgeu = 3'b111;

    always @(*) begin
        case(op) begin

            branch_beq: 
                branch_out = (rs1 == rs2)   ? 1'b1 : 1'b0; 
            branch_bne: 
                branch_out = (rs1 != rs2)   ? 1'b1 : 1'b0; 
            branch_blt: 
                branch_out = (rs1 < rs2)    ? 1'b1 : 1'b0; 
            branch_bge: 
                branch_out = (rs1 > rs2)    ? 1'b1 : 1'b0; 
            branch_bltu: 
                branch_out = (rs1 < $unsigned(rs2)) ? 1'b1 : 1'b0; 
            branch_bgeu: 
                branch_out = (rs1 > $unsigned(rs2)) ? 1'b1 : 1'b0; 
            default:
                branch_out = 1'b0;
                
        end 
    end

module branch(
	input[31:0]rs1,
	input[31:0]rs2,
	input[2:0] op,
	output reg branch_out
);
alway@(*)begin
	case(op)
		3'b000:begin 
			if(rs1==rs2)
				branch_out=1'b1;
			else 
				branch_out=1'b0;
		end//
		3'b001:begin 
			if(rs1!=rs2)
				branch_out=1'b1;
			else 
				branch_out=1'b0;
		end//
		3'b100:begin 
			if(rs1<rs2)
				branch_out=1'b1;
			else 
				branch_out=1'b0;
		end//
		3'b110:begin 
			if(rs1<-rs2)
				branch_out=1'b1;
			else 
				branch_out=1'b0;
		end//
		3'b101:begin 
			if(rs1>=rs2)
				branch_out=1'b1;
			else 
				branch_out=1'b0;
		end//
		3'b111:begin 
			if(rs1>=rs2)
				branch_out=1'b1;
			else
				 branch_out=1'b0;
		end//
		default:branch_out=1'b0;
	endcase
end
endmodule


## 網址
[why are risc-v](https://stackoverflow.com/questions/58414772/why-are-risc-v-s-b-and-u-j-instruction-types-encoded-in-this-way)
[risc-v 解決， b type](https://ithelp.ithome.com.tw/articles/10268196)
## 點子 / 撇步
- i-type(immediate) 因為rs2取代成imm ,因此會先load在rs1地址
[name=第三組]
- s-type(save/store)
[name=第三組]
- jump的imm較為複雜是因為最高的位元…看正負號……
[name=第三組]
- rs1 如果 ujenable 為 on, 所以 rs1=pc
[name=第三組]
- 用vscode講解jump指令
[name=第三組]
- jump enable為什麼沒有關掉instrution…要用posedge 關掉
[name=第三組]
- 討論剩下 J,B type並將指令剩下第三組的部分兜起來
[name=kim]
- live coding
[name=第三組]
- a u I pc 算法也差不多
[name=willwho]
- w 關起來用disable
[name=第三組]
- imm有缺的地方要補起來
[name=第三組]
- 如果bq rs1 ＝ rs2 加上pc地址後的
[name=第三組]
- 黑貓查原廠收藏
[name=黑貓，dctime]
- 要接回 pc 怎麼辦
[name=黑貓]
- 有module其實一次用很多次運算，一次輸入輸出
- 跟軟體很不一樣
- modipraser
- 不能回到 register file
[name=Willwho]

## 聊天室內容