Computer Architecture Question : Function & Address Decoder?

[Steven_McL]

Hi , I'm having a real problem with this college assessment I have.

I have got every answer written out except for the last one , I cannot find anywhere on the internet with a 5 / 6 line description of the following components within a CPU.

Address Decoder
Function Decoder

Could any kind person please help?
Thanks so much if you can

[elglg]

The Function Decoder is used to decode a specific operation. So for example, the CPU will read in a certain instruction as a 2 digit hexadecimal code, the function decoder will then use a look up table to decode the digits into a certain function already programmed into the cpu.

The address decoder is pretty similar except does it for addresses, maybe for external ram for example. So it would decode 2 hex digits to be passed out through the address ports of a cpu to address external ram.

[Steven_McL]

perfect mate , thank you so much

[elglg]

no probs