Is the 8085 pipelined processor or not?

[aniketd]

IS 8085 pipelined???

can any one tell me 8085 is pipe lined processor or not?
i think it's not? but my friends are telling me that there are differnt fetch and execution cycle.

 

[rkodaira]

Re: IS 8085 pipelined???

You are right. It is not. See the datasheet and you will realize that the machine cycles are sequential, i.e. they occur one at a time and there is no different machine cycles executing at same time.

 

[Code Warrior]

IS 8085 pipelined???

8085 is not and it is now out dated processor.

 

[PaulHolland]

Re: IS 8085 pipelined???

No.

Paul.

 

[pvinbox@yahoo.com]

Re: IS 8085 pipelined???

hai

8085 is not a pipelined one
8086 is the pipelined one.
but both were outdated long time back

 

[rituparnasaikia]

IS 8085 pipelined???

no

 

[PaulHolland]

Re: IS 8085 pipelined???

Hi, 8085 AND 8086 are both NOT pipelined CPU's, they use the "Von Neumann" execution model.

https://en.wikipedia.org/wiki/Von_Neumann_architecture

CPU's with a pipeline use the "Harvard" execution model.

https://en.wikipedia.org/wiki/Harvard_architecture

8085, 8086, 80186 are NOT. pipeline started from 80486 !!..

Paul.

 

[neils_arm_strong]

IS 8085 pipelined???

hi PaulHolland,
8086 is pipelined whereas8085 is not. 8086 has a 6 byte que remember?.

 

[PaulHolland]

Re: IS 8085 pipelined???

Hi, But is it really a pipeline in the sence that it is executing ONE instruction at a clock ??.. if not then its a normal state machine part of von neumann.

A true pipelined cpu is taking an instruction at clock one and the next at clock two, but what you mean is that it takes an instruction and devices it into parts. This is also done by the 8051 .....

Paul.

 

[abhikohli]

Re: IS 8085 pipelined???

Pipelining is when we break combinational path by adding reg. in between. When we were kids at that time we were told 8086 is pipelined as it has instruction que..... however that is not pipelineing in true sense , another thing is each stage of pipelining always add one clock latancy, this can easily tell you if the given design is pipelined, and upto what extent ...

 

[nand_gates]

Re: IS 8085 pipelined???

8085 is not purely pipelined processor!
But for single byte instructions it does pipelining,
while executing currently fetched and decoded instuction
it fetches next instruction to be executed. It you try to write
verilog code for 8085 you will get this concept. Or you can check
gl85 vhdl code for 8085! I have implemented my verilog 8085 in same way!

 

[the_risk_master]

Re: IS 8085 pipelined???

Hi,

I think 8085 is semi-pipeline through the Instruction Register (according to its architechture) and it is true that 8086 has 6 que while 8088 has 4 These microprocessors are the real piped-line ones.

 

[sample]

Re: IS 8085 pipelined???

no 8085 is not apipelined processor
but it successor 8086 is pipelined one

for more details u can ask

 

[beta0]

IS 8085 pipelined???

A CISC architecture is hardly to pipeline

 

[PaulHolland]

Re: IS 8085 pipelined???

To: the_risk_master and all others.

These processors are NOT pipelined, maybe your VHDL code you have has build a core that is pipelined and able to run 8085/86 code but the original is NOT pipelined. If you know the PIC microchip fam, they also have a que of 2 instructions and still is NOT pipelined.

Paul.

 

[Harmasha]

Re: IS 8085 pipelined???

Hi,

8085 is not pipe lined and it is true that its Van Nuemann...

But Paul do note that 8086 is Harvard Architecture only.