def check_wr_protection_area(self, num_blk, wr_data):
# checks fields which have the write protection bit.
# if the write protection bit is set, we need to protect that area from changes.
write_disable_bit = self.read_field("WR_DIS", bitstring=False)
mask_wr_data = BitString(len(wr_data))
mask_wr_data.set(0)
blk = self.Blocks.get(self.Blocks.BLOCKS[num_blk])
if blk.write_disable_bit is not None and write_disable_bit & (
1 << blk.write_disable_bit
):
mask_wr_data.set(1)
else:
for e in self.Fields.EFUSES:
field = self.Fields.get(e)
if blk.id == field.block and field.block == num_blk:
if field.write_disable_bit is not None and write_disable_bit & (
1 << field.write_disable_bit
):
data = self.read_field(field.name)
data.set(1)
mask_wr_data.pos = mask_wr_data.length - (
field.word * 32 + field.pos + data.len
)
mask_wr_data.overwrite(data)
mask_wr_data.invert()
return wr_data & mask_wr_data
