questions

[gda]

1.which is better for processor architecture design and why? external
RAM or internal RAM?

2.which is better for processor architecture design and why? external
ROM or internal ROM?

3.what is the advantages and disadvantages of simple processor with
pipelining and without pipelining?

 

[ALuPin]

3.what is the advantages and disadvantages of simple processor with
pipelining and without pipelining?

one advantage: Because of partitioning the logic task into several stages
the timing of your circuit can be improved.

one disadvantage : Latency is introduced by the use of the pipelining stages.

Rgds

 

[Jeroen]

one advantage: Because of partitioning the logic task into several stages
the timing of your circuit can be improved.

one disadvantage : Latency is introduced by the use of the pipelining

stages.

There are more disadvantages to pipelining, like datahazards, the need to
flush the pipeline when the flow of the execution changes etc. There is
additional logic needed to cover these situations. On opencores.org there is
a design of an AVR compatible core which includes a very in-depth discussion
of pipelining.

Jeroen