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After about two years and two beta versions, I will present you KDCCX!

KDCCX is the evolution of the old KDCC in new system were brought (and come in future) all the new technologies of the DCC and XpressNet.

COMPUTING POWER

KDCCX is designed for the future as it is born fully multitasking biprocessore fact, unlike other projects in the web, it presents solutions nearest to a PC that a simple card with a PIC16F628 who usually do everything with little performance.
KDCCX have two microprocessors PIC18F2520 (future versions will be provided with the PIC18F2620 and PIC16F876 in this case will be limited) who works with a single 10MHz clock that is multiplied x4 to obtain an internal frequency of 40MHz, this speed, combined with a program memory of 32 KByte and a RAM of 1536 KByte (per processor), guarantees plenty of memory for future software upgrade.
The concept of biprocessore, already adopted by KDCC proved to be a good choice because it allows for 100% of a processor dedicated to a single task playing in the best possible. KDCCX provides the interface XpressNet with a PIC18F2520 and the other PIC dedicated to the generation of DCC signa, the two chips are connected by a fast parallel bus 8bit for data + 4-bit addresses.

SCHEME:

PCB and Firmwares

The pdf's files of PCB top - PCB bottom and the mircochips's firmwares ar aviable in Download page.

MODULARITY

KDCCX is also modular in design, I have given that the plant could adapt to the tastes of the user.
The first characteristic that makes KDCCX modular architecture is a dual processor fact, if you only want a CV program station (reading and writing CV), you only mount a single IC3.
The second characteristic is that the system’s pcb (10cm x 10cm) was designed to connect other expansion’s
fauters :

-Power-booster
-Booster for programming
-Expansion for RJ11 connectors
-RF modules
-RailCom
-form rectification and filtering loss of power
-etc ...

These expansions will be available in future and may be connected to KDCCX simply stacking one on top and connecting them through connections provided in the project.
Once complete, the plant will be a cube power!
Obviously the user will be according to your needs to decide what to connect KDCC!

AT THIS TIME

At this time, what can offer KDCCX?

Software:

-It can simultaneously control 40 locomotives (only 12 with 16F876) with addresses  from 1 to 9999 without the defect of the XpressNet protocol 99-127*

-It can control 1024 turnouts and signals (from firmware ver. 024 above)

-It can handle all 31 addresses XpressNet

-Supports any device that supports the protocol XpressNet (Lokmaus, Multimaus, etc.).

-Read and writes CV in DIRECT MODE

-Write CV in POM (Program On the Main)

-Supports 28 and 128 speed step

-FL (lights) and F1 through F12

-Ready to RailCom Cutout (as soon as his booster will be aviable)

Hardware:

>>>>>>>>>>>>>>>>>>>>>> Mettere il Pdf del pcb <<<<<<<<<<<<<<<<<<<<<

-ICSP connectors on board for each microprocessor you can program them without extract from card.

-Supply for separate hardware card and bus Xpressnet

-two DCC’s  signals phased for external Booster drive to bridge H

-Input signal short-circuit and ACK overvoltage protected (voltage applied from 3 volts to 24 volts)

-RJ11 female connector on board XpressNet

-Connector with signals XpressNet, 12 volt and mass.

-Indicator light (LED) to the central government.

99-127

* The protocol XpressNet presents an anomaly in the management of addresses.
From 1 to 99 XpressNet identifies such values as "short address" (CV1) instead from 100 until 9999 as "long address" (CV17 and CV18). This address management creates compatibility problems between central and decoder, in fact all decoders below the standard NMRA identify as "short address" the values of 1 to 127 and "long address” from 128, how can we understand there’s a discrepancy of 28 addresses between XpressNet and NMRA, this anomaly is reflected in an apparent malfunction of the decoder with short addresses between 100 and 127, because the decoder expect the command and instead receive others that can not process and therefore do not perform. KDCCX solves this problem by analyzing the XpressNet’s commands before sending to the decoder and, where necessary, it corrects the error without the user notice!