Home
  VHDL
  Structure
    LUT
    MUX1
    MCC
    MCROM
    MUX2
    Register
    ALU
    EMU
  ImpReport
  InstrSet
  Links
  Nicht gefunden
MCROM

e-mail: info@flexputer.de

29/07/02 10:43

The Micro Code ROM (MCROM) is a 1024 x 20 bit ROM(RAM) and contains the micro code instructions.

JP

19

Fetch
1 Bit
18


3 Bit
17 16 15


5 Bit
14 13 12 11 10


5 Bit
9 8 7 6 5


5 Bit
4 3 2 1 0

0

 

ALU Opr

DstReg

SrcBReg

SrcAReg

1

 

0 - Jump
1 - Jump Zero
2 - Call
3 - Call Z
4 - Return
5 - finish

Jump Address

SrcAReg

1

 

6 - Read Mem
7 - WriteMem

No of bytes

AddrReg

DataReg

When JP is 0 a register to register operation is executed.

The Fetch Bit (FB) is used to tell the External Memory Unit to fetch the next instruction, even if the current micro code sequence is not finished.

Call and Return are currently not implemented.