HC11 Transistor Architecture

Noone wrote:
> Only the old duffers in the group would remember RTL.
> (I be one).   Fairchild was the supplier I remember best.

Everett M. Greene wrote:
> Wasn't Fairchild the only supplier?

No, there were many suppliers.  Motorola and TI also made RTL.
I think Signetics did as well, but I'm not 100% certain.

Motorola may have been the vendor to most recently discontinue RTL;
some of the RTL parts were still available from them in the late 1980s.

Eric

In article <WuadnfD9MpXRIfXeRVn-sA@giganews.com>,
harivj <harivj@rediffmail.com> wrote:
>Hai
>
>Is there anybody give me guidance about RTL implementation of the complete
>68HC11. I am involved in design of one such at transistor level and none of
>the book or online reference talk about pure hardware implementation. All I
>could see is how to program a HC11 but not how to build one. Any
>information in this regard would help.

Look for the "Cycle-by-Cycle Bus Activity" description in the programmers
reference or datasheet.  Digging on the bookshelf, the old (1985)
Programmer's Manual MC68HC11PM/AD gives a lot more information on what
happens on a cycle by cycle basis than the later Reference Manual (which
puts this on the page for each instruction instead of a seperate section).

Getting a more detailed block diagram (than shows up in the later 68HC11
documents) of the CPU section out of a 6800 or 6801 may add some insight.

Mark Zenier  mzenier@eskimo.com  
Googleproofaddress(account:mzenier provider:eskimo domain:com)