README
¶
td4sim
This is 4bit CPU Simulator made using only NAND and Latch. See Japanese book "How to make CPU" (ISBN4-8399-0986-5) for details.
TD4とは『CPUの創りかた - IC10個のお手軽CPU設計超入門 初歩のデジタル回路動作の基本原理と製作』で 説明されている4bitCPU。これを NAND と Latch から始めて 各IC部品の動作を組み立て、最終的にTD4として動くように作った。
How to use
td4sim [OPTIONS]
If there is no option, a demo instruction add 1 to register A and B is loaded.
And the clock advances automatically.
OPTIONS:
-load=FILE ... load memory image text.
-dipsw=0000 ... load dipsw initial status.
-manual ... clock ticking by hand.
-load=FILE
プログラムメモリを記述したテキストファイルを読む
テキストファイルは一行に8bit分、改行区切りで16行分
8bitは最上位ビットが先頭、最下位ビットが最後になる
0 または 1 を並べて記述する、スペースは無視される
#は以降はコメント
指定しない場合は、A,Bレジスタに交互に1をADDする
プログラムがロードされる
-dipsw=0000
ロード時のDIPスイッチの状態を0または1を並べて4bit分記述する
4bitは最上位ビットが先頭、最下位ビットが最後になる
指定しない場合は 0000 となる
-manual
クロックを手動で動かす
指定しない場合は 1Hz で自動でクロックが動く
Demo
repeat ADD A,0b0001 and ADD B,0b0001 endlessly.
Instructions
Memory is 8bit x 16words. There is also a 4bit DIPSW for input.
High Low Input
7 6 5 4 3 2 1 0 dipsw carry | mnemonic
------------------------------|------------
0 0 1 1 d a t a ---- - | MOV A,data
0 1 1 1 d a t a ---- - | MOV B,data
0 0 0 1 0 0 0 0 ---- - | MOV A,B
0 1 0 0 0 0 0 0 ---- - | MOV B,A
0 0 0 0 d a t a ---- - | ADD A,data
0 1 0 1 d a t a ---- - | ADD B,data
0 0 1 0 0 0 0 0 data - | IN A,data(dipsw)
0 1 1 0 0 0 0 0 data - | IN B,data(dipsw)
1 0 1 1 d a t a ---- - | OUT data == MOV C,data
1 0 0 1 0 0 0 0 ---- - | OUT B == MOV C,B
1 1 1 1 d a t a ---- - | JMP data
1 1 1 0 d a t a ---- c | JNC data (jump if carry==0)
Documentation
¶
Index ¶
- func Counter4(d0, d1, d2, d3, load, clear *Line) []*Line
- func Decoder(op0, op1, op2, op3, ncflg *Line) (sela, selb *Line, nload [4]*Line)
- func IC74HC153(c10, c11, c12, c13, c20, c21, c22, c23, a, b *Line) (y1, y2 *Line)
- func IC74HC161C(d0, d1, d2, d3, nload, nclear *Line) (q []*Line)
- func IC74HC161R(d0, d1, d2, d3, nload, nclear *Line) (q []*Line)
- func IC74HC283(a0, a1, a2, a3, b0, b1, b2, b3, c0 *Line) (s [4]*Line, c4 *Line)
- func IC74HC74(d, nclear *Line) (q, nq *Line)
- func Initialize()
- func ROM(memory [][]*Line, in []*Line) (out []*Line)
- func Register4(d0, d1, d2, d3, load, clear *Line) []*Line
- func TickTock()
- func ToString(list []int) string
- type CPUInfo
- func (c *CPUInfo) ChangeDIPSW(sw int)
- func (c *CPUInfo) GetStateOfCarryFlag() []int
- func (c *CPUInfo) GetStateOfDIPSW() []int
- func (c *CPUInfo) GetStateOfMemory() [][]int
- func (c *CPUInfo) GetStateOfProgramCounter() []int
- func (c *CPUInfo) GetStateOfRegisterA() []int
- func (c *CPUInfo) GetStateOfRegisterB() []int
- func (c *CPUInfo) GetStateOfRegisterC() []int
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func IC74HC153 ¶
func IC74HC153(c10, c11, c12, c13, c20, c21, c22, c23, a, b *Line) (y1, y2 *Line)
IC74HC153 is Selector
func IC74HC161C ¶
func IC74HC161C(d0, d1, d2, d3, nload, nclear *Line) (q []*Line)
func IC74HC161R ¶
func IC74HC161R(d0, d1, d2, d3, nload, nclear *Line) (q []*Line)
func IC74HC283 ¶
func IC74HC283(a0, a1, a2, a3, b0, b1, b2, b3, c0 *Line) (s [4]*Line, c4 *Line)
IC74HC283 is 4bit full adder
func Initialize ¶
func Initialize()
func ROM ¶
func ROM(memory [][]*Line, in []*Line) (out []*Line)
ROM is 8bit x 16word memory. Looping 8 times after enabling one of the selectors to retrieve memory contents. For example, if you want to get the last memory:
Input Selector Memory
+---------------+ <-+
(H,H,H,H) s[0] ----> | 8bit | |
(L) +---------------+ |
[4]in s[1] ----> | .... | | 16
| (L) +---------------+ | word
+-> BDec -> s[n] ----> | .... | |
(L) +---------------+ |
s[15] ---> | 8bit (Target) | |
(H) +---------------+ <-+
|
| x 8times loop
|
+---> [8]out
Types ¶
type CPUInfo ¶
type CPUInfo struct {
// contains filtered or unexported fields
}
func (*CPUInfo) ChangeDIPSW ¶
func (*CPUInfo) GetStateOfCarryFlag ¶
func (*CPUInfo) GetStateOfDIPSW ¶
func (*CPUInfo) GetStateOfMemory ¶
func (*CPUInfo) GetStateOfProgramCounter ¶
func (*CPUInfo) GetStateOfRegisterA ¶
func (*CPUInfo) GetStateOfRegisterB ¶
func (*CPUInfo) GetStateOfRegisterC ¶
Source Files
Directories
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