60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
from typing import TYPE_CHECKING
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from collections import namedtuple
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from systemrdl.component import Reg
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from systemrdl.node import RegNode
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from ..forloop_generator import RDLForLoopGenerator
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if TYPE_CHECKING:
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from . import WriteBuffering
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class WBufLogicGenerator(RDLForLoopGenerator):
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i_type = "genvar"
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def __init__(self, wbuf: 'WriteBuffering') -> None:
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super().__init__()
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self.wbuf = wbuf
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self.exp = wbuf.exp
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self.template = self.exp.jj_env.get_template(
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"write_buffering/template.sv"
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)
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def enter_Reg(self, node: 'RegNode') -> None:
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super().enter_Reg(node)
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assert isinstance(node.inst, Reg)
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if not node.get_property('buffer_writes'):
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return
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regwidth = node.get_property('regwidth')
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accesswidth = node.get_property('accesswidth')
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strb_prefix = self.exp.dereferencer.get_access_strobe(node, reduce_substrobes=False)
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Segment = namedtuple("Segment", ["strobe", "bslice"])
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segments = []
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if accesswidth < regwidth:
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n_subwords = regwidth // accesswidth
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for i in range(n_subwords):
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strobe = strb_prefix + f"[{i}]"
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if node.inst.is_msb0_order:
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bslice = f"[{regwidth - (accesswidth * i) - 1}: {regwidth - (accesswidth * (i+1))}]"
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else:
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bslice = f"[{(accesswidth * (i + 1)) - 1}:{accesswidth * i}]"
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segments.append(Segment(strobe, bslice))
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else:
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segments.append(Segment(strb_prefix, ""))
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trigger = node.get_property('wbuffer_trigger')
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is_own_trigger = (isinstance(trigger, RegNode) and trigger == node)
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context = {
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'wbuf': self.wbuf,
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'wbuf_prefix': self.wbuf.get_wbuf_prefix(node),
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'segments': segments,
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'node': node,
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'cpuif': self.exp.cpuif,
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'get_resetsignal': self.exp.dereferencer.get_resetsignal,
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'get_always_ff_event': self.exp.dereferencer.get_always_ff_event,
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'is_own_trigger': is_own_trigger,
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}
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self.add_content(self.template.render(context))
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