tinyriscv/rtl/perips/i2c/i2c.hjson

// Copyright lowRISC contributors.
// Licensed under the Apache License, Version 2.0, see LICENSE for details.
// SPDX-License-Identifier: Apache-2.0
{ name: "i2c",
  clocking: [{clock: "clk_i", reset: "rst_ni"}],
  bus_interfaces: [
    { protocol: "tlul", direction: "device" }
  ],
  regwidth: "32",
  registers: [
    { name: "CTRL",
      desc: "I2C control register",
      swaccess: "rw",
      hwaccess: "hrw",
      hwqe: "true",
      fields: [
        { bits: "0",
          name: "START",
          desc: "I2C start",
        }
        { bits: "1",
          name: "INT_EN",
          desc: "I2C interrupt enable",
        }
        { bits: "2",
          name: "INT_PENDING",
          swaccess: "rw1c",
          desc: "I2C interrupt pending",
        }
        { bits: "3",
          name: "MODE",
          desc: "I2C mode, 0: master, 1: slave",
        }
        { bits: "4",
          name: "WRITE",
          desc: "0: write, 1: read",
        }
        { bits: "5",
          name: "ERROR",
          swaccess: "ro",
          desc: "0: no error, 1: error",
        }
        { bits: "6",
          name: "SLAVE_WR",
          swaccess: "ro",
          desc: "0: write, 1: read",
        }
        { bits: "7",
          name: "SLAVE_RDY",
          desc: "0: not ready, 1: ready",
        }
        { bits: "15:8",
          name: "SLAVE_ADDR",
          desc: "I2C slave address",
        }
        { bits: "31:16",
          name: "CLK_DIV",
          desc: "I2C clock divider count",
        }
      ]
    }
    { name: "MASTER_DATA",
      desc: "I2C master transfer data register",
      swaccess: "rw",
      hwaccess: "hrw",
      fields: [
        { bits: "7:0",
          name: "ADDRESS",
          desc: "I2C slave address",
        }
        { bits: "15:8",
          name: "REGREG",
          desc: "I2C write or read reg",
        }
        { bits: "23:16",
          name: "DATA",
          desc: "I2C write or read data",
        }
      ]
    }
    { name: "SLAVE_ADDR",
      desc: "I2C slave read or write address register",
      swaccess: "ro",
      hwaccess: "hrw",
      fields: [
        { bits: "7:0",
          name: "ADDR0",
          desc: "I2C slave read or write address[7:0]",
        }
        { bits: "15:8",
          name: "ADDR1",
          desc: "I2C slave read or write address[15:8]",
        }
        { bits: "23:16",
          name: "ADDR2",
          desc: "I2C slave read or write address[23:16]",
        }
        { bits: "31:24",
          name: "ADDR3",
          desc: "I2C slave read or write address[31:24]",
        }
      ]
    }
    { name: "SLAVE_WDATA",
      desc: "I2C slave write data register",
      swaccess: "ro",
      hwaccess: "hrw",
      fields: [
        { bits: "7:0",
          name: "WDATA0",
          desc: "I2C slave write data[7:0]",
        }
        { bits: "15:8",
          name: "WDATA1",
          desc: "I2C slave write data[15:8]",
        }
        { bits: "23:16",
          name: "WDATA2",
          desc: "I2C slave write data[23:16]",
        }
        { bits: "31:24",
          name: "WDATA3",
          desc: "I2C slave write data[31:24]",
        }
      ]
    }
    { name: "SLAVE_RDATA",
      desc: "I2C slave read data register",
      swaccess: "rw",
      hwaccess: "hro",
      fields: [
        { bits: "31:0",
          desc: "I2C slave read data",
        }
      ]
    }
  ]
}