MFM Encoder

In principle, a MFM Encoder works exactly the other way round like the MFM Decoder described in the chapter 1.7.

A MFM Encoder works according to the principle of time shifting and phase shifting. This method is based on the transmitting frequency and the MFM signals are generated in connection with the double transmitting frequency. More details concerning the MFM can be obtained from several sites in the Internet .

In the meantime, I have got used to the hardware description language Verilog at my RL02 simulator project very well. My ready developed MFM-ENCODER is obvious in the version V1.2 with a detailed description here.

The MFM Encoder at my RL02 simulator project works with a transmitting frequency of 4.1 MHz. The necessary 8.2 MHz are created via divider with an input frequency of 16.4 MHz. The 16.4 MHz are conditional historically since at my MAXII CPLD either these MFM encoder came to use, no PLL was available, though, so that the frequency had to be created with an external oscillator.
In the following picture the real one part of the Encoder is represented as a schematic circuit diagram for everyone who prefers this graphic rendition comparing to a Verilog implementation.

Development process:
The development based on blockdiagram with individual components and gates got more problematic and inefficient. I have given up this kind of development and replaced most of my modules by Verilog programs.
The individual steps at the development of the MFM encoder also are shown to complete this section:
First development with wiring block diagram.
B) Second
development with wiring block diagram and Verilog module.