search

douggilliland / R32V2020

My 32-bit RISC CPU for smallish FPGAs
GNU General Public License v3.0
17 stars 3 forks source link

Create opcode constants table #33

Closed douggilliland closed 5 years ago

douggilliland commented 5 years ago

@mjgpy3 I have a VHDL pattern for the opcodes. It defines constants for the various opcodes. Looks like: constant NOP : std_Logic_Vector(7 downto 0) := "00000000"; constant HCF : std_Logic_Vector(7 downto 0) := "00000001"; constant RES : std_Logic_Vector(7 downto 0) := "00000010"; -- ALU constant ADS : std_Logic_Vector(7 downto 0) := "00100000"; ...

Would be cool if the whole table dropped out of the assembler. Would make it easier to keep things in sync.

douggilliland commented 5 years ago

Here's the current list I manually made (and update manually): -- System constant NOP : std_Logic_Vector(7 downto 0) := "00000000"; constant HCF : std_Logic_Vector(7 downto 0) := "00000001"; constant RES : std_Logic_Vector(7 downto 0) := "00000010"; -- ALU constant ADS : std_Logic_Vector(7 downto 0) := "00100000"; constant MUL : std_Logic_Vector(7 downto 0) := "00100001"; constant CMP : std_Logic_Vector(7 downto 0) := "00100010"; constant ORS : std_Logic_Vector(7 downto 0) := "00101000"; constant ARS : std_Logic_Vector(7 downto 0) := "00101001"; constant XRS : std_Logic_Vector(7 downto 0) := "00101010"; constant LS1 : std_Logic_Vector(7 downto 0) := "00110000"; constant RS1 : std_Logic_Vector(7 downto 0) := "00110001"; constant LR1 : std_Logic_Vector(7 downto 0) := "00110010"; constant RR1 : std_Logic_Vector(7 downto 0) := "00110011"; constant RA1 : std_Logic_Vector(7 downto 0) := "00110100"; constant ENS : std_Logic_Vector(7 downto 0) := "00111000"; -- Immediate Opcodes constant LIL : std_Logic_Vector(7 downto 0) := "01000000"; constant LIU : std_Logic_Vector(7 downto 0) := "01000001"; -- Load/Store Data Memory Opcodes constant LDB : std_Logic_Vector(7 downto 0) := "01100000"; constant SDB : std_Logic_Vector(7 downto 0) := "01100001"; constant LDS : std_Logic_Vector(7 downto 0) := "01100010"; constant SDS : std_Logic_Vector(7 downto 0) := "01100011"; constant LDL : std_Logic_Vector(7 downto 0) := "01100100"; constant SDL : std_Logic_Vector(7 downto 0) := "01100101"; -- Peripheral I/O Opcodes constant LPB : std_Logic_Vector(7 downto 0) := "10000000"; constant SPB : std_Logic_Vector(7 downto 0) := "10000001"; constant LPS : std_Logic_Vector(7 downto 0) := "10000010"; constant SPS : std_Logic_Vector(7 downto 0) := "10000011"; constant LPL : std_Logic_Vector(7 downto 0) := "10000100"; constant SPL : std_Logic_Vector(7 downto 0) := "10000101"; -- Stack Opcodes constant PSS : std_Logic_Vector(7 downto 0) := "10100000"; constant PUS : std_Logic_Vector(7 downto 0) := "10100001"; constant SSS : std_Logic_Vector(7 downto 0) := "10100010"; constant LSS : std_Logic_Vector(7 downto 0) := "10100011"; -- Flow Control constant JSR : std_Logic_Vector(7 downto 0) := "11000000"; constant RTS : std_Logic_Vector(7 downto 0) := "11000001"; constant BRA : std_Logic_Vector(7 downto 0) := "11010000"; constant BCS : std_Logic_Vector(7 downto 0) := "11010001"; constant BCC : std_Logic_Vector(7 downto 0) := "11010010"; constant BEZ : std_Logic_Vector(7 downto 0) := "11010011"; constant BE1 : std_Logic_Vector(7 downto 0) := "11010100"; constant BOV : std_Logic_Vector(7 downto 0) := "11010101"; constant BEQ : std_Logic_Vector(7 downto 0) := "11010110";

mjgpy3 commented 5 years ago

@douggilliland sounds like a great idea!

mjgpy3 commented 5 years ago

@douggilliland I took care of this. I'll update the wiki page to show how to run.

douggilliland commented 5 years ago

@mjgpy3

Awesome! Very nice to have that ability.

I am trying to figure out how to make the constant values into globals for the VHDL code. I think they have some sort of "package manager" that allows that. For the moment I will copy/paste it where it needs to go.

Thanks!