6502.org Forum  Projects  Code  Documents  Tools  Forum
It is currently Fri Nov 15, 2024 1:38 pm

All times are UTC




Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Mon Oct 14, 2019 2:16 pm 
Offline

Joined: Mon Oct 14, 2019 2:01 pm
Posts: 1
I know that the state can be set to T0 by the #TWOCYCLE.phi1 signal (signal names from visual6502) but that is just in the case of a two cycle instruction.
Also someone said that setting the state to T0 is handled by the pla in the case of instructions with more cycles but I just can't find out which pla outputs handle this.

I would love if someone could tell me the pla outputs.


Top
 Profile  
Reply with quote  
PostPosted: Tue Oct 15, 2019 7:58 pm 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10980
Location: England
Welcome, Sphereso. You might like to read some of the visual6502 wiki, for example
http://visual6502.org/wiki/index.php?ti ... Decode_ROM

About T0: in a sense, there is not a T0 state. There are a number of state bits, and one of them we call T0, but they are not exclusive. In a typical simulation you'll see combinations of the 'tcstate' bits which we describe in the 'State' column as T0 and as T0+T2. See for example
http://www.visual6502.org/JSSim/expert. ... loglevel=3


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC


Who is online

Users browsing this forum: DRG and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: