URL https://opencores.org/ocsvn/tinycpu/tinycpu/trunk

Subversion Repositories tinycpu

[/] [tinycpu/] [trunk/] [docs/] [design.md.txt] - Diff between revs 25 and 27

Rev 25	Rev 27
Line 287...	Line 287...
`legend:`	`legend:`
`r = register choice`	`r = register choice`
`C = conditional portion`	`C = conditional portion`
`s = segment register choice`	`s = segment register choice`
`i = immediate data`	`i = immediate data`
	`N = not used`
	`o = opcode choice (for groups)`

`0000 rrrC iiii iiii`	`0000 rrrC iiii iiii`
`mov reg, immediate`	`mov reg, immediate`

	`0001 rrrC iiii iiii`
	`mov [reg], immediate`

	`group 3 comparions`
	`0011 rrrC Crrr Nooo`
	`opcode choices`
	`000: is greater than reg1,reg2 (TR=reg1>reg2)`
	`001: is greater or equal to reg,reg`
	`010: is less than reg,reg`
	`011: is less than or equal to reg,reg`
	`100: is equal to reg,reg`
	`101: is not equal to reg,reg`
	`110: equals 0 reg`
	`111: not equals 0 reg`

	`group 4 bitwise`
	`0100 rrrC Crrr Nooo`
	`opcode choices`
	`000: and reg1,reg2 (reg1=reg1 and reg2)`
	`001: or reg, reg`
	`010: xor reg,reg`
	`011: not reg1,reg2 (reg1=not reg2)`
	`100: left shift reg,reg`
	`101: right shift reg,reg`
	`110: rotate right reg,reg`
	`111: rotate left reg,reg`