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soc: optimize programmable identifier

This commit is contained in:
Sebastien Bourdeauducq 2020-03-12 23:09:13 +08:00
parent 9e66dd7075
commit 4a8d361ace
1 changed files with 8 additions and 15 deletions
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23
artiq/build_soc.py
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@ -34,21 +34,14 @@ class ReprogrammableIdentifier(Module, AutoCSR):
raise ValueError("Identifier string must be 255 characters or less")
contents.insert(0, l)
init_params = {i: 0 for i in range(0x40)}
for i, c in enumerate(contents):
# 0x38 was determined empirically. Another Xilinx mystery.
row = 0x38 + i//32
col = 8*(i % 32)
init_params[row] |= c << col
init_params = {"p_INIT_{:02X}".format(k): v for k, v in init_params.items()}
self.specials += Instance("RAMB18E1", name="identifier_str",
i_ADDRARDADDR=Cat(C(0, 3), self.address.storage),
i_CLKARDCLK=ClockSignal(),
o_DOADO=self.data.status,
i_ENARDEN=1,
p_READ_WIDTH_A=9,
**init_params)
for i in range(8):
self.specials += Instance("ROM256X1", name="identifier_str"+str(i),
i_A0=self.address.storage[0], i_A1=self.address.storage[1],
i_A2=self.address.storage[2], i_A3=self.address.storage[3],
i_A4=self.address.storage[4], i_A5=self.address.storage[5],
i_A6=self.address.storage[6], i_A7=self.address.storage[7],
o_O=self.data.status[i],
p_INIT=sum(1 << j if c & (1 << i) else 0 for j, c in enumerate(contents)))
def add_identifier(soc, *args, **kwargs):