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# Copyright (c) 2013 Amin Farmahini-Farahani
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# Copyright (c) 2015 The University of Bologna
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"""Interfaces for DDR3 memories

These memory "interfaces" contain the timing, energy, etc. parameters for each
memory type and are usually based on datasheets for the memory devices.

You can use these interfaces in the MemCtrl object as the `dram` timing
interface.
"""

from m5.objects import DRAMInterface


class DDR3_1600_8x8(DRAMInterface):
    """
    A single DDR3-1600 x64 channel (one command and address bus), with
    timings based on a DDR3-1600 4 Gbit datasheet (Micron MT41J512M8) in
    an 8x8 configuration.

    """

    # size of device in bytes
    device_size = "512MiB"

    # 8x8 configuration, 8 devices each with an 8-bit interface
    device_bus_width = 8

    # DDR3 is a BL8 device
    burst_length = 8

    # Each device has a page (row buffer) size of 1 Kbyte (1K columns x8)
    device_rowbuffer_size = "1KiB"

    # 8x8 configuration, so 8 devices
    devices_per_rank = 8

    # Use two ranks
    ranks_per_channel = 2

    # DDR3 has 8 banks in all configurations
    banks_per_rank = 8

    # 800 MHz
    tCK = "1.25ns"

    # 8 beats across an x64 interface translates to 4 clocks @ 800 MHz
    tBURST = "5ns"

    # DDR3-1600 11-11-11
    tRCD = "13.75ns"
    tCL = "13.75ns"
    tRP = "13.75ns"
    tRAS = "35ns"
    tRRD = "6ns"
    tXAW = "30ns"
    activation_limit = 4
    tRFC = "260ns"

    tWR = "15ns"

    # Greater of 4 CK or 7.5 ns
    tWTR = "7.5ns"

    # Greater of 4 CK or 7.5 ns
    tRTP = "7.5ns"

    # Default same rank rd-to-wr bus turnaround to 2 CK, @800 MHz = 2.5 ns
    tRTW = "2.5ns"

    # Default different rank bus delay to 2 CK, @800 MHz = 2.5 ns
    tCS = "2.5ns"

    # <=85C, half for >85C
    tREFI = "7.8us"

    # active powerdown and precharge powerdown exit time
    tXP = "6ns"

    # self refresh exit time
    tXS = "270ns"

    # Current values from datasheet Die Rev E,J
    IDD0 = "55mA"
    IDD2N = "32mA"
    IDD3N = "38mA"
    IDD4W = "125mA"
    IDD4R = "157mA"
    IDD5 = "235mA"
    IDD3P1 = "38mA"
    IDD2P1 = "32mA"
    IDD6 = "20mA"
    VDD = "1.5V"


class DDR3_2133_8x8(DDR3_1600_8x8):
    """
    A single DDR3-2133 x64 channel refining a selected subset of the
    options for the DDR-1600 configuration, based on the same DDR3-1600
    4 Gbit datasheet (Micron MT41J512M8). Most parameters are kept
    consistent across the two configurations.
    """

    # 1066 MHz
    tCK = "0.938ns"

    # 8 beats across an x64 interface translates to 4 clocks @ 1066 MHz
    tBURST = "3.752ns"

    # DDR3-2133 14-14-14
    tRCD = "13.09ns"
    tCL = "13.09ns"
    tRP = "13.09ns"
    tRAS = "33ns"
    tRRD = "5ns"
    tXAW = "25ns"

    # Current values from datasheet
    IDD0 = "70mA"
    IDD2N = "37mA"
    IDD3N = "44mA"
    IDD4W = "157mA"
    IDD4R = "191mA"
    IDD5 = "250mA"
    IDD3P1 = "44mA"
    IDD2P1 = "43mA"
    IDD6 = "20mA"
    VDD = "1.5V"