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implement relationship between delay pinouts

This commit is contained in:
Sam Crow 2023-06-14 17:10:07 -07:00
parent bf516a927d
commit dbc9de6c9a
1 changed files with 23 additions and 3 deletions
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26
compiler/modules/control_logic_delay.py
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@ -105,9 +105,29 @@ class control_logic_delay(control_logic_base):
pinout_list=self.delay_chain_pinout_list)
def calculate_delay_chain_size(self):
self.delay_chain_pinout_list = []
# calculate it... dummy values for now
self.delay_chain_pinout_list = [2, 12, 13, 15, 29]
"""
calculate the pinouts needed for the delay chain based on:
wl driver delay, bl minus vth delay, precharge duration
delays 1 & 2 need to be even for polarity
delays 3 - 5 need to be odd for polarity
"""
# TODO: calculate relevant delay constants
stage_delay = None
precharge_duration = None
bitline_vth_delay = None
delays = []
# hardcode 2 delay stages as keepout between p_en and wl_en
delays[1] = 2
delays[3] = delays[1] + precharge_duration / stage_delay
# delays[2] can be any even value less than delays[3]
delays[2] = delays[3] - 1
# delays[4] hardcoded 2 delays[ ]stages as keepout between p_en and wl_en
delays[4] = delays[3] + 2
delays[5] = delays[4] + bitline_vth_delay / stage_delay
self.delay_chain_pinout_list = delays
# FIXME: fanout should be used to control delay chain height
# for now, use default/user-defined fanout constant
self.delay_chain_fanout_list = self.delay_chain_pinout_list[-1] * [OPTS.delay_chain_fanout_per_stage]
def setup_signal_busses(self):