Re: [oc] T80 core

["jely donut" <jelydonut@iraqmail.com>]

Thanks,

I've been looking at the code and noticed the connection.  Its obviously gonna take some time to know that code inside and out.
Appreciate the help man!

jelydonut

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<-----Original Message----->
>  
> From: MikeJ
> Sent: 1/22/2003 3:08:44 PM
> To: cores@opencores.org
> Subject: Re: [oc] T80 core
> 
> Hi again,
>  
> I did some debugging on the original core, which I simulated running known code and looked at what 
> happened inside while it was running.
> The z80 databook explains states and mcycles etc - but simply a tstate is a clock and a Mcycle 
> (machine cycle) is a 'phase'. The processor will first execute an instruction fetch (the first 
> Mcycle, signal M1 is asserted) which takes 4 tstates. Then, depending on the instruction it 
> retrieves, a number of additional Mcycle's will occur (each of varying tstate lengths) to execute 
> the opcode. This is all defined in the big case statement in the instruction decoder.
>  
> your best bet is to play with it in the simulator ....
>  
> Cheers,
> Mike.
> ----- Original Message ----- 
> From: jely donut 
> To: cores@opencores.org 
> Sent: Wednesday, January 22, 2003 2:47 PM
> Subject: Re: [oc] T80 core
> 
> 
> Actually I was hoping to find some information on the internal lines in the system. As in the 
> meanings of the states in the state machine (Tstate, Mcycle) for instance. Im trying to figure out 
> how it works but due to the lack of comments its a difficult battle.
> 
> jelydonut
> 
> 
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> 
> <-----Original Message----->
> 
> From: MikeJ
> Sent: 1/21/2003 12:59:52 PM
> To: cores@opencores.org
> Subject: Re: [oc] T80 core
> 
> look for an old z80 datasheet / databook, that should tell you everything you need to know.
> There are some examples of how to wire it up in the distribution.
> /Mike
> ----- Original Message ----- 
> From: jely donut 
> To: cores@opencores.org 
> Sent: Tuesday, January 21, 2003 5:13 PM
> Subject: [oc] T80 core
> 
> 
> I don't know if anyone will get this as this is the second email i've sent but..
> 
> Does anyone have any information on the T80 core that is available on the site. Im looking 
> perferably for any documentation or even quick summary of the purpose of each bus/control line.
> 
> Thanks
> 
> jelydonut 
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