Group counting practice experiment 9 -- using cmstudio to design microprogram instructions based on segment model machine (2)

One 、 The experiment purpose

1. Master the instruction design of segmented model machine

Two 、 Experimental equipment

1. Hardware ： nothing
2. Software ：CMSstudio
   3、 ... and 、 Experimental content
3. Master the instruction design of segmented model machine
   Four 、 Experimental principle
4. The program and data are in the same ⼀ address space • AR To refer to as an address pointer • increase PC send AR Micromanipulation
5. • Programs and data are stored separately , Program segment and data segment , And stack segments • Fingering ：PC • Get the opcode and operand • Data access ：AR
6. • Stack pointer ：SP • The stack data – Stored in data segments • Stack data access ： – SP send AR – adopt AR To achieve
7. • INL DR • OUTL SR • STA [ADDR], SR • LD DR, [ADDR] • JMP ADDR

5、 ... and 、 The experimental steps

1. • For the following instructions
   – INL DR
   – OUTH SR
   – STA [ADDR], SR
   – LD DR, [ADDR]
   – JMP ADDR

2. • Write the machine instruction format • Draw the microinstruction flow chart

3. • send ⽤ The above instruction system is programmed , Realization
   – INPUT read ⼊ The data is saved to ADDR,
   – take ADDR The content is OUTPUT display ⽰.
   – cycle – Be careful ：INPUT read ⼊ To memory and memory output to OUTPUT What you have done ⽤ The register of The requirements are not the same ⼀ individual
   6、 ... and 、 Commissioning process 、 Results and Analysis

4. • For the following instructions
   – INL DR
   – OUTH SR
   – STA [ADDR], SR
   – LD DR, [ADDR]
   – JMP ADDR

5. • Write the machine instruction format
   According to the experiment 8 It is not difficult for us to set the following format

I designed my own instruction diagram

Source program

No addition data segment
assume ds:data

It means that this is a segmented （ Simultaneous use ROM and RAM）

Command system

The design of instruction code and length is detailed in my experiment 8 article

Microprogramming

Don't forget here
RD – p.
RS – accidentally
For example, when the source is Register, And the goal is IOL When , At this time, if we set the instruction code to 21
The first 21 convert to 16 Base number
0100 0001

0100 convert to 1101000000（ Corresponding forwarding address 640, therefore 2 The beginning corresponds to 640,0 Beginning correspondence 600）
If we use even pass even （ The second even finger here INPUT/OUTPUT Low position — That is to say IOL） So the first pair corresponds to RD part （ That is to say 01, That is to say R1 register ）
If you use odd even , So the corresponding odd uses RS part （ That is to say 00, That is to say R0 register ）

start

640

680

6C0

700

740

During the experiment, we can find that the program area is changed

The data area is also loaded with data by us

Finally, the remaining registers are filled according to the experimental requirements