Hello Mr. jez Smith,

I had to look up the definition VHDL to understand what you were referring to.
I also came across an good tutor site. I am sure your design took many years of experience to get done. Thanks for sharing with us.

VHDL=Very High Speed Integrated Circuit Hardware Description Language
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An excellent tutor can be see at the following web site.

http://www.vhdl-online.de/~vhdl/tut...inhalt.htm

Regards,

Charles Bannister