What is this?

This is project of reverse engineering Ncompunting L230 PCB (rev 1.4).

What is there?

• cpld/ - template for CPLD firmware for Quartus
• fpga/ - template for FPGA firmware for Quartus
• pcb/- simplified schematic in Kicad format
• doc/- some datasheets for used chips

Main chips

• FPGA: EP1C12Q240C8N
• CPLD: EPM3128ATC100-10N
• Flash: AT45DB041B
• SDRAM: IS42S32400D-7TL
• Ethernet: RTL8201CL
• Audio input: PCM1808
• Audio output amplifier: LM358

Programming

Programming header J1 have this pinout:

#	Pin	Function
1	MAX-62	TCK
2	MAX-73	TDO
3	MAX-15	TMS
4	-	GND
5	MAX-4	TDI

To program FPGA on-the-fly you need:

1. Cut MAX-73 to J1-2 trace;
2. Connect MAX-73 to CY-155;
3. Connect CY-147 to J1-1;
4. Connect CY-149 to J1-2;
5. Connect CY-148 to J1-3.