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EFC: Implement OOB reset

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occheung 2023-09-02 19:25:08 -07:00 committed by GitHub
parent 904afe1632
commit 838cc80922
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 59 additions and 0 deletions

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@ -11,6 +11,7 @@ class RXSerdes(Module):
self.cnt_in = [ Signal(5) for _ in range(4) ]
self.cnt_out = [ Signal(5) for _ in range(4) ]
self.bitslip = [ Signal() for _ in range(4) ]
self.o = [ Signal() for _ in range(4) ]
ser_in_no_dly = [ Signal() for _ in range(4) ]
ser_in = [ Signal() for _ in range(4) ]
@ -34,6 +35,7 @@ class RXSerdes(Module):
o_Q6=self.rxdata[i][4],
o_Q7=self.rxdata[i][3],
o_Q8=self.rxdata[i][2],
o_O=self.o[i],
o_SHIFTOUT1=shifts[i][0],
o_SHIFTOUT2=shifts[i][1],
i_DDLY=ser_in[i],
@ -391,6 +393,56 @@ class SerdesSingle(Module):
& decoders[0].k))
class OOBReset(Module):
def __init__(self, iserdes_o):
ce_counter = Signal(13)
activity_ce = Signal()
transition_ce = Signal()
self.sync.clk200 += Cat(ce_counter, activity_ce).eq(ce_counter + 1)
self.comb += transition_ce.eq(ce_counter[0])
idle_low_meta = Signal()
idle_high_meta = Signal()
idle_low = Signal()
idle_high = Signal()
idle = Signal()
self.rst = Signal(reset=1)
# Detect the lack of transitions (idle) within 2 clk200 cycles
self.specials += [
Instance("FDCE", p_INIT=1, i_D=1, i_CLR=iserdes_o,
i_CE=transition_ce, i_C=ClockSignal("clk200"), o_Q=idle_low_meta,
attr={"async_reg", "ars_ff1"}),
Instance("FDCE", p_INIT=1, i_D=idle_low_meta, i_CLR=0,
i_CE=transition_ce, i_C=ClockSignal("clk200"), o_Q=idle_low,
attr={"async_reg", "ars_ff2"}),
Instance("FDCE", p_INIT=1, i_D=1, i_CLR=~iserdes_o,
i_CE=transition_ce, i_C=ClockSignal("clk200"), o_Q=idle_high_meta,
attr={"async_reg", "ars_ff1"}),
Instance("FDCE", p_INIT=1, i_D=idle_high_meta, i_CLR=0,
i_CE=transition_ce, i_C=ClockSignal("clk200"), o_Q=idle_high,
attr={"async_reg", "ars_ff2"}),
]
# Detect activity for the last 2**13 clk200 cycles
# The 2**13 cycles are fully partitioned into 2**12 time segments of 2
# cycles in duration. If there exists 2-cycle time segment without
# signal level transition, rst is asserted.
self.sync.clk200 += [
If(activity_ce,
idle.eq(0),
self.rst.eq(idle),
),
If(idle_low | idle_high,
idle.eq(1),
self.rst.eq(1),
),
]
class EEMSerdes(Module, TransceiverInterface, AutoCSR):
def __init__(self, platform, data_pads):
self.rx_ready = CSRStorage()
@ -472,4 +524,8 @@ class EEMSerdes(Module, TransceiverInterface, AutoCSR):
self.submodules += serdes_list
self.submodules.oob_reset = OOBReset(serdes_list[0].rx_serdes.o[0])
self.rst = self.oob_reset.rst
self.rst.attr.add("no_retiming")
TransceiverInterface.__init__(self, channel_interfaces, async_rx=False)

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@ -89,6 +89,9 @@ class Satellite(BaseSoC, AMPSoC):
self.add_csr_group("drtioaux", ["drtioaux0"])
self.add_memory_group("drtioaux_mem", ["drtioaux0_mem"])
# Async reset gateware if data lane is idle
self.comb += self.crg.reset.eq(self.eem_transceiver.rst)
i2c = self.platform.request("fpga_i2c")
self.submodules.i2c = gpio.GPIOTristate([i2c.scl, i2c.sda])
self.csr_devices.append("i2c")