HC11 Transistor Architecture

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Hai

Is there anybody give me guidance about RTL implementation of the complet
68HC11. I am involved in design of one such at transistor level and none o
the book or online reference talk about pure hardware implementation. All
could see is how to program a HC11 but not how to build one. An
information in this regard would help.
Thanks, Vijay



Re: HC11 Transistor Architecture

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You want to build an HC11 using resistor-transistor logic?

I suppose it's possible -- you could build one from relays if
you had enough of them, but why on earth would one attempt such
a thing?

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Grant Edwards                   grante             Yow!  I'm protected by
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Re: HC11 Transistor Architecture

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I believe Vijay is referring to Register Transfer Level representation of
the HC11. It's essentially a programmatic method of simulation.

-- Noel Henson
www.noels-lab.com       Chips, firmware and embedded solutions
www.vimoutliner.org     Work fast. Think well.

Re: HC11 Transistor Architecture

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Ah. I thought it must be something other than
resistor-transistor logic, but all Google came up with was the
German TV netowrk.  I probably should have thrown in a few more
keywords.

Is RTL synthesizable, or is it just for simulation?

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Grant Edwards                   grante             Yow!  I'm sitting on my
                                  at               SPEED QUEEN... To me,
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Re: HC11 Transistor Architecture
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RTL isn't a specific language, it's a level of abstraction.  I'm not
sure of a formal definition, but in general it involves defining
registers and the data paths and conbinatorial logic that links them.

RTL code would most commonly be written in Verilog or VHDL, though other
suitable languages exist.  Normally an RTL design should be
sythesizable; the non-synthesizable constructs in the HDLs generally
aren't appropriate for an RTL design.  An obvious example would be a
VHDL statement such as "wait 5 ns"; such a statement isn't consistent
with RTL.

Eric

Re: HC11 Transistor Architecture

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Thanks.  Got it. I thought it was a specific language, but
couldn't find anything concrete about it.

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Grant Edwards                   grante             Yow!  .. over in west
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Re: HC11 Transistor Architecture
Grant:

Only the old duffers in the group would remember RTL.  (I be one).   Fairchild
was the supplier I remember best.  The venerable 723/923 flip flop and the 900
buffers.  The packages were great little blobs of epoxy similar to the
transistors of the day.  We, of course, felt empowered by such technology.

Blakely

Grant Edwards wrote:

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Re: HC11 Transistor Architecture

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I must admit that I never actually used RTL (but it was still
covered briefly when I was in school).  One of the first places
I worked still had a few drawers of RTL parts for maintenance
purposes.

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Re: HC11 Transistor Architecture
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My first IC's - MC 700 series, NOR logic with severely limited
fan-in and fan-out. Year 1968 or 1969.

--

Tauno Voipio
tauno voipio (at) iki fi

Re: HC11 Transistor Architecture
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Wasn't Fairchild the only supplier?

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They were also great little hand warmers on cold days.

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It beat discrete components!

Re: HC11 Transistor Architecture
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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

Re: HC11 Transistor Architecture
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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   snipped-for-privacy@eskimo.com  
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