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Tue Aug 14 23:15:48 EDT 2018

Sizes of things

140 LUTs for UART transmit and CPU.
That's not a whole lot.

I wonder what a good ratio is for LUT to transistor count.
4004 had 2300 transistors.

A FF is about 10 transistors.

A LUT is about 20 transistors maybe?  Accounting for low resource use?

This says one LUT is 6 NAND gate equivalent.
A CMOS NAND gate is 4 transistors.

Which is 24 transistors per LUT.

https://blogs.synopsys.com/breakingthethreelaws/2015/02/how-many-asic-gates-does-it-take-to-fill-an-fpga/


So the CPU is about (* 24 140) 3360 transistor equivalent.

Orig Z80 was 8500 NMOS

Compare this to a PIC.
PIC12C508 8-bit 1200 nanometre process
https://en.wikipedia.org/wiki/PIC_microcontrollers

That's quite a big feature size.  1985 technology.

https://en.wikipedia.org/wiki/Microprocessor_chronology

https://www.pcmag.com/encyclopedia/term/49759/process-technology


     Nanometers  Micrometers
 Year     (nm)        (┬Ám)

 1957   120,000      120.0
 1963    30,000       30.0
 1971    10,000       10.0
 1974     6,000        6.0
 1976     3,000        3.0
 1982     1,500        1.5
 1985     1,300        1.3
 1989     1,000        1.0
 1993       600        0.6
 1996       350        0.35
 1998       250        0.25
 1999       180        0.18
 2001       130        0.13
 2003        90        0.09
 2005        65        0.065
 2008        45        0.045
 2010        32        0.032
 2012        22        0.022
 2014        14        0.014
 2017        10        0.010
 2018         7        0.007
  ??          5        0.005




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