Computer architecture - Push & Pop.

[CookieMonster]

I would be very greatful if someone could point me in the right direction. While I understand this to be the execute sequence for a PUSH in register transfer language:

 

[AC] --> ALU --> ALUB

 

[ALUB] --> MWB

 

[sP] --> MAR

 

[MAR] --> Address decoder

 

[MWB] --> M

 

[sP] + 1 --> SP

 

I am unsure as to the POP instruction. Would it be the opposite of the push i.e.

 

[sP] - 1 --> SP

M --> [MWB]

Adress decoder --> [MAR]

 

or is this completely wrong. Any help would greately appreciated.