Topic       : Documentation of the CT60
Author      : Didier MEQUIGNON
Version     : Version 2.00 (December 11, 2010)
Subject     : Documentation
Nodes       : 135
Index Size  : 3664
HCP-Version : 3
Compiled on : Atari
@charset    : atarist
@lang       : 
@default    : 
@help       : 
@options    : -i
@width      : 75
View Ref-File3.3.2  The CTCM module with a DS1085Z-50                          CT60

It's possible to add a programmable clock generator by step of 50 KHz
on the CT60. The module use a DS1085Z-50 connected on the CT60
oscillator socket and two SDRAM module I2C signals SDA (82) and SLC
(83).





 ATTENTION ! 

The CTCM module use the two unused pins on the DIL14 socket by the
pins 2 SCL to the pin 83 of the SDRAM socket, and 3 SDA to the pin 83
of the SDRAM socket in order to remove easily the clock module.
Solder two very fine wires.




               +-------------+
               |            +5V      CLK      CLK
               |           14o__o__o__o__o__o__o
               |        +-------------'        |8
               |        |    |                 |
               |        |     )   CT60 clock   |
   ____________o__o__o__o_   |      socket     |
  |strap      +5V      OUT  1|SCL SDA          |7
  |  X                  0|   o--o--o--o--o--o--o
  |        CTCM   +-------------+  | GND      GND
  |       module  |      |         |  |
  |               |  +-------------+  |
  +---------------o--o--o-GND         |
                SCL SDA +-------------+

 Synoptic 





   ∙ The programmable CT60 clock output is OUT0. If the CTRL0 input
     is at 1 the clock is between 33 and 66 MHz (strap cut). If the
     CTRL0 input is at 0 the clock is between 66 and 110 MHz (strap
     put).

     WARNING! The boot 2.0 not support this jumper because the CTCM
     clock is not stable (no PLL) and it's impossible to read the
     state of the jumper. So the frequency range is 66 to 110 MHz
     (the DALLAS used on the CTCM isn't certified for work below 66
     MHz).

   ∙ OUT1 can be used for user clock, but there are always a link
     with the CT60 clock with a divider from 2 to 6, excepted for a
     frequency <= 66 MHz :


                CT60 clock (MHz)  OUT1 (MHz)  Divider 
                     66.000         33.000      /2 
                     66.600         16.650      /4 
                     66.000         33.000      /2 
                     99.000         33.000      /3 


 Remark :  This possibility is disabled on the CTCM module because
the CTRL1 pin is at 1 (connected to the +5V).

The TOS check if the module exist and can change the clock between 33
and 66 MHz or 66 and 110 MHz according to the strap on the module
(see also the part 'Change the CT60 frequency').

Look at http://www.czuba-tech.com for more informations about this
module.

 Remark :  For the frequency to 100 MHz, you must fix the CT60 clock
(look at 'CT60-100 clock').