def decode_phi(self, xlow, xup):
"""
for the HW represntation: the phi variable goes across 32bit word boundary
at the boundary a control bit is reserved
"""
# this is a specialized function because phi reaches over the word boundary
ctrl_mask = bithlp.get_mask(31, 31)
# +1 because dinyar shaves off the 32nd bit in the vhdl-file
raw_mask = bithlp.get_mask(xlow, xup+1)
# mask is 11110111111 for phi
mask = raw_mask ^ ctrl_mask
raw_val = self.bitword & mask
raw_val = raw_val >> xlow
lsw_mask = bithlp.get_mask(0, 5)
msw_mask = bithlp.get_mask(7, 10)
val = (raw_val & lsw_mask) + ((raw_val & msw_mask) >> 1)
return val
def decode_phi(self, xlow, xup):
"""
for the HW represntation: the phi variable goes across 32bit word boundary
at the boundary a control bit is reserved
"""
# this is a specialized function because phi reaches over the word boundary
ctrl_mask = bithlp.get_mask(31, 31)
# +1 because dinyar shaves off the 32nd bit in the vhdl-file
raw_mask = bithlp.get_mask(xlow, xup+1)
# mask is 11110111111 for phi
mask = raw_mask ^ ctrl_mask
raw_val = self.bitword & mask
raw_val = raw_val >> xlow
lsw_mask = bithlp.get_mask(0, 5)
msw_mask = bithlp.get_mask(7, 10)
val = (raw_val & lsw_mask) + ((raw_val & msw_mask) >> 1)
return val
def encode_phi(self, phi):
"""
As the hardware expects a control bit on position 31 and phi
goes across the word boundary we need to put a zero in the
middle.
"""
mask_lsw = bithlp.get_mask(0, 5) # 0-5 for phi
lsw = int(phi) & mask_lsw
msw = int(phi) >> 6
encoded_phi = lsw + (msw << 7)
return encoded_phi
def encode_phi(self, phi):
"""
As the hardware expects a control bit on position 31 and phi
goes across the word boundary we need to put a zero in the
middle.
"""
mask_lsw = bithlp.get_mask(0, 5) # 0-5 for phi
lsw = int(phi) & mask_lsw
msw = int(phi) >> 6
encoded_phi = lsw + (msw << 7)
return encoded_phi
