import globals
import design
from math import log
import design
from tech import GDS,layer
import utils

class ms_flop(design.design):
    """
    Memory address flip-flop
    """

    pins = ["din", "dout", "dout_bar", "clk", "vdd", "gnd"]
    chars = utils.auto_measure_libcell(pins, "ms_flop", GDS["unit"], layer["boundary"])

    def __init__(self, name):
        design.design.__init__(self, name)

        self.width = ms_flop.chars["width"]
        self.height = ms_flop.chars["height"]

        self.clk_offset = ms_flop.chars["clk"]
        self.din_offset = ms_flop.chars["din"]
        self.dout_offset = ms_flop.chars["dout"]
        self.dout_bar_offset = ms_flop.chars["dout_bar"]

    def delay(self, slope, load = 0.0):
        #import pinv
        # use inv to mimic the delay
        # din -> mout
        #ref =  pinv.pinv("reference_inv")
        #mid_load = ref.input_load()
        #din_t_mout_delay = ref.delay(slope = slope, load = mid_load)

        # mout -> out
        #mout_t_out_delay = ref.delay(slope = slope, load = load)
        #result = din_t_mout_delay + mout_t_out_delay

        # dont k how to calculate this now, use constant in tech file
        from tech import spice
        result = self.return_delay(spice["msflop_delay"], spice["msflop_slope"])
        return result