digraph G {
  newrank=true;
  overlap=false;
  splines=ortho;

  node [shape=box fillcolor=white style=filled fontname="Inter" width=1 target="_top"];
  edge [arrowsize="0.5"];
  rankdir=TB; 
  fontname="Inter";
  label=<<font point-size='24'> <br/>MNT Reform 2.0D-4 System Diagram<br/> </font>>;
  labelloc="t";

  rtc  [label="Realtime\nClock" href="system.html#rtc"];
  rtcbat  [label="Coin Cell" href="system.html#rtc"];
   
  subgraph cluster_som {
    fontname="Inter";
    color=lightgrey;
    label=<<br/><b>System on Module</b>>;
    labelloc="t";
    margin="25.0";
    
    style=filled;
    
    subgraph cluster_soc {
      fontname="Inter";
      color=white;
      label=<<br/>System on Chip (i.MX8M)>;
      labelloc="t";
      margin="25.0";
      
      dsi  [label="MIPI DSI" href="system.html#mipi-dsi"];
      hdmi  [label="HDMI" href="system.html#hdmi"];
      sai  [label="SAI" href="system.html#sai"];
      i2c0  [label="I2C 1" href="system.html#i2c"];
      
      usb0  [label="USB3 Root 1" href="system.html#usb3"];
      usb1  [label="USB3 Root 2" href="system.html#usb3"];

      ddrc [label="DDRC" href="system.html#ddrc"];

      sd1  [label="MMC/SD1" href="system.html#mmc"];
      sd2  [label="MMC/SD2" href="system.html#mmc"];
      
      uart1 [label="UART 2" href="system.html#uart"];
      pcie0  [label="PCIe 1" href="system.html#pcie"];
      pcie1  [label="PCIe 2" href="system.html#pcie"];
      uart0 [label="UART 1" href="system.html#uart"];
      
      //uart2 [label="UART 3"];
      
      pwm [label="PWM" href="system.html#pwm"];
      
      ethmac  [label="ETH MAC" href="system.html#eth-mac"];

      cpu0 [label="Cortex-A53" href="system.html#cortex-a53"];
      cpu1 [label="Cortex-M4F" href="system.html#cortex-m4f"];
      gpu [label="GPU GC7000L" href="system.html#gpu"];
      
      i2c1  [label="I2C 2" href="system.html#i2c"];
      spi1 [label="SPI" href="system.html#spi"];
    }

    ram [label="LPDDR4\nRAM 4GB" href="system.html#ddrc"];
    emmc [label="eMMC\n~8GB" href="system.html#mmc"];
    
    ethphy  [label="ETH PHY" href="system.html#eth-phy"];
    
    s5v  [label="5V Input"];
  }
  
  hub  [label="USB Hub" href="system.html#usb-hub"];
  
  adac  [label="DAC WM8960" href="system.html#dac"];
  dsi2edp  [label="DSI to eDP\nConverter" href="system.html#dsi2edp"];

  subgraph cluster_headers {
    fontname="Inter"
    labelloc="b";
    margin="25.0";
    color=lightgrey;
    style=filled;
    label=<<b>Internal Ports</b><br/> >;

    iuart0  [label="UART1" href="system.html#uart"];
    iuart1  [label="UART2\nConsole" href="system.html#uart"];

    iusb0 [label="IUSB1" href="system.html#usb3"];
    iusb1 [label="IUSB2" href="system.html#usb3"];

    impcie [label="mPCIe Slot" href="system.html#pcie"];
    im2 [label="M.2 Slot\nKey M" href="system.html#pcie"];
  }
  
  subgraph cluster_power {
    fontname="Inter"
    label=<<b>Power</b><br/> >;
    labelloc="b";
    color=lightgrey;
    style=filled;
    margin="25.0";
    
    subgraph cluster_system_control {
      fontname="Inter"
      label="System Control\n ";
      labelloc="b";
      color=white;
      style=filled;
      margin="25.0";
      
      lpc  [label="MCU LPC11U24" width=4 href="system.html#lpc"];
      ina  [label="Current &\nVoltage Monitor" href="system.html#ina"];
      
      ltc  [label="Buck/Boost\nDC-DC and Charger" href="system.html#ltc4020"];

      mon  [label="Cell Monitor\nBalancer" href="system.html#balancer"];
      
      lspi  [label="SPI" shape=diamond fillcolor=lightgrey href="system.html#spi"];
      li2c  [label="I2C" shape=diamond fillcolor=lightgrey href="system.html#i2c"];
    
      cells [label="8x LiFePO4 18650 Batteries" shape=rectangle href="system.html#cells"];
      supply [label="24V Power Supply\nfrom Barrel Jack" shape=rectangle href="system.html#barreljack"];
    
      enabchg [label="Charge On" shape=diamond fillcolor=lightgrey href="system.html#lpc"];
      enab5v [label="On" shape=diamond fillcolor=lightgrey href="system.html#lpc"];
      enab3v3 [label="On" shape=diamond fillcolor=lightgrey href="system.html#lpc"];
    }

    subgraph cluster_power_rails {
      fontname="Inter"
      label="Power Rails\n ";
      color=white;
      style=filled;
      margin="25.0";
      
      r28v  [label="~28V" shape=diamond fillcolor=lightgrey];
      stby [label="3V3 Standby" href="system.html#standby"];
      r5v  [label="5V" width=1.1 href="system.html#r5v"];
      r3v3 [label="3V3" href="system.html#r3v3"];
      
      r1v2 [label="1V2" width=0.5 href="system.html#r1v2"];
      r1v5 [label="1V5" width=0.5 href="system.html#r1v5"];
      r1v8 [label="1V8" width=0.5 href="system.html#r1v8"];
    }
  }

  subgraph cluster_ports {
    fontname="Inter"
    label=<<b>External Ports</b><br/> >;
    labelloc="b";
    margin="25.0";
    color=lightgrey;
    style=filled;
    
    pusb3  [label="USB3 Port 3" href="system.html#usb3"];
    pusb2  [label="USB3 Port 2" href="system.html#usb3"];
    pusb1  [label="USB3 Port 1" href="system.html#usb3"];

    pbarrel [label="Barrel Jack" href="system.html#barreljack"];
    
    phdmi  [label="HDMI Port" href="system.html#hdmi"];
    psdcard  [label="SD Card Slot" href="system.html#mmc"];
    peth [label="1G Ethernet Port" href="system.html#eth-mac"];

    paudio  [label="Headphone &\nMic Jack" href="system.html#audiojack"];
  }
  lshift  [label="Level Shifter" href="system.html#mmc"];
  
  //refclk  [label="PCIe Clock Generator"];
  
  
  subgraph cluster_hmi {
    fontname="Inter"
    color=lightgrey;
    style=filled;
    label=<<b>Human Machine Interface</b><br/> >;
    labelloc="b";
    margin="25.0";
    
    subgraph cluster_screen {
      fontname="Inter"
      color=white;
      style=filled;
      label="Screen Assembly\n ";
      margin="25.0";

      panel  [label="12.5\" 1920x1080\nIPS Panel" href="system.html#panel"];
      backlight  [label="Backlight" href="system.html#panel"];
      speakers  [label="Stereo\nSpeakers" href="system.html#speakers"];
    }
    
    subgraph cluster_trackball {
      fontname="Inter"
      color=white;
      style=filled;
      label="Trackball\n ";
      margin="25.0";
      
      tmcu  [label="MCU Atmega32U2" width=3 href="system.html#tbctrl"];
      tsens  [label="Motion Sensor" href="system.html#tbsensor"];
      
      ti2c  [label="I2C" shape=diamond fillcolor=lightgrey href="system.html#i2c"];
      tgpio  [label="GPIO" shape=diamond fillcolor=lightgrey href="system.html#tbctrl"];      
      tkeys  [label="5 Buttons" href="system.html#kbkeys"];
    }

    subgraph cluster_keyboard {
      fontname="Inter"
      color=white;
      style=filled;
      label="Keyboard\n ";
      margin="25.0";
      
      kmcu  [label="MCU Atmega32U4" width=3 href="system.html#kbctrl"];

      oled [label="OLED Display 128x32" href="system.html#oled"];
      
      ki2c  [label="I2C" shape=diamond fillcolor=lightgrey href="system.html#i2c"];
      kuart  [label="UART" shape=diamond fillcolor=lightgrey href="system.html#kbctrl"];
      kgpio  [label="GPIO" shape=diamond fillcolor=lightgrey href="system.html#kbctrl"];
      kkeys  [label="Key Matrix" href="system.html#kbkeys"];
    }
  }

  { rank=same; ddrc, cpu0, cpu1, gpu }
  
  { rank=same; kmcu, tmcu, lpc, panel }

  { rank=same; ltc, mon, ina }
  { rank=same; enab5v, enab3v3, cells, supply }
  
  { rank=same; iusb0, iusb1, iuart0, iuart1, impcie, im2, paudio}
    
  { rank=same; usb0, usb1, ethphy, rtc, i2c1 }
  { rank=same; adac, dsi2edp }

  { rank=same; spi1, i2c0, pwm }

  { rank=same; hdmi, ethmac, emmc }
  { rank=same; peth, hub, pusb3 }
  
  { rank=same; phdmi, psdcard, pbarrel }
  
  
  // power signals
  
  lpc -> lspi -> mon  [arrowhead=none];
  lpc -> li2c -> ina  [arrowhead=none];
  lpc -> enabchg -> ltc;
  
  mon -> cells [arrowhead=none];
  ina -> cells [arrowhead=none];
  
  ltc -> cells [arrowhead=none,color=red];
  supply -> ltc [arrowhead=none,color=red];

  lpc -> enab5v -> r5v;
  lpc -> enab3v3 -> r3v3;

  // power
  
  r28v -> r5v   [color=red];
  r28v -> r3v3  [color=red];
  r28v -> stby  [color=red];
  r5v -> r1v2   [color=red];
  r5v -> r1v5   [color=red];
  r3v3 -> r1v8  [color=red];
  ltc -> r28v   [color=red];
  cells -> r28v [color=invis];

  rtcbat -> rtc [arrowhead=none,color=red];
  
  stby -> lpc [color=red,constraint=false];
  stby -> kmcu [color=red,constraint=false];

  // soc/som signals, external ports
  usb1 -> hub [arrowhead=none];
  hub -> pusb1 [arrowhead=none];
  hub -> pusb2 [arrowhead=none];
  usb0 -> pusb3 [arrowhead=none];
  hdmi -> phdmi [arrowhead=none];

  sd2 -> lshift -> psdcard  [arrowhead=none];
  ethmac -> ethphy -> peth [arrowhead=none];
  sai -> adac  [arrowhead=none];
  
  ddrc -> ram [arrowhead=none];
  sd1 -> emmc [arrowhead=none];

  r5v -> s5v [color=red constraint=false];

  // internal ports
  pcie0 -> impcie [arrowhead=none];
  pcie1 -> im2 [arrowhead=none];
  uart0 -> iuart0 [arrowhead=none];
  uart1 -> iuart1 [arrowhead=none];
  hub -> iusb1 [arrowhead=none];
  hub -> iusb0 [arrowhead=none];

  iusb0 -> kmcu [arrowhead=none];
  iusb1 -> tmcu [arrowhead=none];

  // trackball internal signals

  tmcu -> ti2c -> tsens [arrowhead=none];
  tmcu -> tgpio -> tkeys [arrowhead=none];

  // keyboard internal signals
  
  kmcu -> ki2c -> oled [arrowhead=none];
  kmcu -> kgpio -> kkeys [arrowhead=none];
  kmcu -> kuart -> lpc [arrowhead=none];
  
  i2c1 -> rtc [arrowhead=none];
  i2c0 -> adac [arrowhead=none];

  // uart2 -> lpc;
  spi1 -> lpc [arrowhead=none,constraint=false];

  // screen assembly
  
  dsi -> dsi2edp;
  dsi2edp -> panel;
  panel -> backlight [arrowhead=none];
  pwm -> backlight [constraint=false];

  adac -> speakers [arrowhead=none,style=dashed];
  adac -> paudio [arrowhead=none,style=dashed,constraint=false];
}