WIP

B1200

Modern Amiga 1200 clone implementation using Cyclone V FPGA

Features

The hardware design supports these features:

1. USB-C PD Sink / TCPC
2. USB-C DP Sink (4-lane Alt Mode)
   • DisplayPort Output
   • DisplayPort Retimer
3. USB-C 2.0 End point / Hub
   • USB Keyboard
   • USB Mouse
   • UART to FPGA Debug port
   • UART to ESP32 Programming port / bootstrap
4. KVM to switch Monitor/Keyboard/mouse between USB-C upstream or FPGA USB OTG
5. DVI-A output
   • DVI to FPGA
   • VGA to ESP32
6. ESP32 as the embedded controller
   • KVM Switch control
   • Fan Speed Control
   • A500 Keyboard scanner
   • USB HID
   • VGA (64 color) display for boot time messages
   • RTC Emulation on I2C
   • SLiRP Modem Emulation on UART
7. FPGA I2S to analog 3.5mm audio jack output
8. DDR RAM to FPGA expansion bus
9. Cyclone V FPGA on the draughtboard

Hardware Pin assignments:

EC (ESP32) Functions and pin assignments

@o: output @i: Input 3v3: +3.3V logic 1v8: +1.8V logic

• Boot strap (flash): IO0@i, EN@i, U0RXD@i3v3, U0TXD@o3v3
• TCPC
  • Negotiate SINK 5V@3A + 4-lane DP Alt Mode
• I2C Controller: IO21/SDA, IO38/SCL
• DVI-A/VGA output:
  • Red[0,1] = [IO10,IO11]@o3v3
  • Green[0,1] = [IO40,IO45]@o3v3
  • Blue[0,1] = [IO39,IO46]@o3v3
  • HSYNC = IO47@o1v8
  • VSYNC = IO48@o1v8
• DDR
  • Power Good: IO2@o3v3
  • I2C same pin as controller
• WiFi SLiRP modem, UART1
  • TxD = U1TXD@o3v3
  • RxD = U1RXD@i3v3
• KVM
  • User Switch: IO3@i falling edge
  • Port selection: IO5@o3v3, L = USBC DP, H = FPGA DP
• FPGA
  • Temp sensor interupt alaram IO4@i3v3 falling edge
  • Cooling Fan: SENS = IO7@i3v3, PWM = IO8@o3v3
  • I2C peripheral: IO41/SCL, IO42/SDA
• Expansion port:
  • ADC1_CH8
• A500 Keyboard:
  • CLK = IO12@o3v3
  • DATA = IO13@i3v3
  • RST = IO14@o3v3
  • LED STATUS = IO15@o3v3
  • LED INUSE = IO16@o3v3

FPGA (Cyclone V) Functions and pin assignments

• DP on HDMI Flext

Net	FPGA Pin
DP0-	AD11
DP0+	AD10
DP1-	AH5
DP1+	AH6
AUX-	AE7
AUX+	AF6
HPD	AF11

• DP on GPIO_1 header

Net	FPGA Pin
DP0-	AA15
DP0+	Y15
DP1-	AF28
DP1+	AF27
DP2-	AH27
DP2+	AG28
AUX-	AD26
AUX+	AE25
HPD	AC24
LP	AG26

• DVI-D

Net	FPGA Pin
D0+	AG25
D0-	AF25
D1+	AH24
D1-	AG24
D2+	AG23
D2-	AF23
CK+	AH23
CK-	AH22
HPD	AG21

• SNAC on HDMI

Pin	FPGA Pin
1	AH9
2	AG11
3	AF15
4	AH11
5	AH12
6	AG16
7	AF17
8	AD4

• I2S for Line Out

Net	FPGA Pin
DIN	AC4
LRCK	AG8
BCK	AG10
MUTE	AH8

• SliRP UART

Net	FPGA Pin
RXD	U9
TXD	V10

• I2C Controller

Net	FPGA Pin
SDA	AG9
SCK	U14

• Input Switches

Net	FPGA Pin
OSD	AF13
RST	AG13
USER	U13

• LED outputs

Net	FPGA Pin
PWR	AA23
USR	AE26
DSK	Y16

Thanks/Credit

Some sections of the hardware design were inspired by the following projects.

• Terasic DE10-Nano
• QMTECH_Cyclone_V_SoC_KFB
• Hardware_MiSTer: Daughter boards Hardware addons for MiSTer
• PicoDVI: Bitbanged DVI on the RP2040 Microcontroller
• SNAC: Accessory converter for MiSTer
• DE10Jamma JAMMA interface for DE10
• DPSwitch: a simple KVM-style device
• amigakb: Arduino Amiga keyboard interface
• amiga-keyboard: Mechanical Replacement Keyboard for Amiga 500 and 1200
• Amiga1200-Plus: a re-implementation of the Amiga 1200 board
• Amiga-Keyboard: map of Commodore Amiga keyboards

License

The hardware files in this repository are released under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)