hw/top_earlgrey/doc/top_earlgrey.hjson

// Copyright lowRISC contributors.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0
//
// TOP Earlgrey configuration
{ name: "earlgrey",
  type: "top",

  datawidth: "32",  # 32-bit datawidth

  clocks: [
    { name: "main", freq: "100000000" }
  ]

  // Number of cores: used in rv_plic and timer
  num_cores: "1",

  // `module` defines the peripherals.
  // Details are coming from each modules' config file `ip.hjson`
  // TODO: Define parameter here
  module: [
    { name: "uart",     // instance name
      type: "uart",     // Must be matched to the ip name in `ip.hson` (_reg, _cfg permitted)
                        // and `hw/ip/{type}`
      clock: "main",    // `ip.hjson` clock is internal name, here top determines
                        // actual clock (signal matched at the top)
      base_addr: "0x40000000",
    },
    { name: "gpio",
      type: "gpio",
      clock: "main",
      base_addr: "0x40010000",
    }

    { name: "spi_device",
      type: "spi_device",
      clock: "main",
      base_addr: "0x40020000",
    },
    { name: "flash_ctrl",
      type: "flash_ctrl",
      clock: "main",
      base_addr: "0x40030000",
    },
    { name: "rv_timer",
      type: "rv_timer",
      clock: "main",
      base_addr: "0x40080000",
    },
    { name: "hmac",
      type: "hmac",
      clock: "main",
      base_addr: "0x40120000",
    },
    { name: "rv_plic",
      type: "rv_plic",
      clock: "main",
      base_addr: "0x40090000",
      generated: "true"         // Indicate this module is generated in the topgen
      parameter: {
        // FIND_MAX determines the algorithm for searching highest priority interrupt.
        // Available: { SEQUENTIAL, MATRIX }
        FIND_MAX: "MATRIX",     // Parameter as key
      }
    }
  ]

  // Memories (ROM, RAM, eFlash) are defined at the top.
  // It utilizes the primitive cells but configurable
  memory: [
    { name: "rom",      type: "rom",    base_addr: "0x00008000", size: "0x2000"  },
    { name: "ram_main", type: "ram_1p", base_addr: "0x10000000", size: "0x10000" },
    { name: "eflash",   type: "eflash", base_addr: "0x20000000", size: "0x80000" },
  ],

  debug_mem_base_addr: "0x1A110000",

  // Crossbars: having a top level crossbar
  // This version assumes all crossbars are instantiated at the top.
  // Assume xbar.hjson is located in the same directory of top.hjson
  xbar: [
    { name: "main",
      clock: "main",    // Main clock, used in sockets
    },
  ],

  // ===== INTERRUPT CTRL =====================================================
  // `rv_plic`  will be instantiate (need to be defined in `module` field
  // If interrupt is not defined, it uses the order from the module list
  // and include every modules.
  // first item goes to LSB of the interrupt source
  interrupt_module: ["gpio", "uart", "spi_device", "flash_ctrl", "hmac" ]

  // RV_PLIC has two searching algorithm internally to pick the most highest priority interrupt
  // source. "sequential" is smaller but slower, "matrix" is larger but faster.
  // Choose depends on the criteria. Currently it is set to "matrix" to meet FPGA timing @ 50MHz

  // generated:
  interrupt: [
  ]

  // TODO: ALERT HANDLER

  // TODO: PINMUX
  pinmux: {

    // Dedicated IO modules. The in/out ports of the modules below are connected
    //  to TOP IO port through PADS directly. It bypasses PINMUX multiplexers
    dio_modules: [
      { name: "spi_device", pad: ["ChB[0..3]"] },
      { name: "uart.tx", pad: ["ChA[0]"]},
      // { name: "dio_module.signal_input", pad: ["ChA[31]"] }
    ],

    // Multiplexing IO modules. The in/out ports of the modules below are
    //  connected through PINMUX, which gives controllability of the connection
    //  between the modules and the IO PADS.
    //  If `mio_modules` aren't defined, it uses all remaining modules from
    //  module list except defined in `dio_modules`.
    mio_modules: ["uart", "gpio"]

    // If any module isn't defined in above two lists, its inputs will be tied
    //  to 0, and the output/OE signals will be floating (or connected to
    //  unused signal). `rv_plic` is special module, shouldn't be defined here.
    nc_modules: ["rv_timer", "hmac"]

    // Below fields are generated.
    // inputs: [
    //  { name: "xxx", width: xx },
    //  ]
    // outputs: [
    //  { name: "xxx", width: xx },
    //  ]
    // inouts: [
    //  { name: "xxx", width: xx },
    //  ]
  }

  // PADS instantiation
  //  Number of in/outs and the numer of PAD instances doesn't have to be
  //  same. The number given below excludes clock/reset and other necessary
  //  PADS but only defines GPIO pads.
  padctrl: {
    attr_default: ["STRONG"],
    pads: [
      { name: "ChA" type: "IO_33V", count: 32 }, // Accessing as ChA[0] .. ChA[31]
      { name: "ChB" type: "IO_33V", count: 4, attr: ["KEEP", "WEAK"]},
    ]
  }

}