urukul: add sync_in generator

for #1143

Signed-off-by: Robert Jördens <rj@quartiq.de>

artiq/coredevice/urukul.py

@@ -115,6 +115,7 @@ class CPLD:
     :param spi_device: SPI bus device name
     :param io_update_device: IO update RTIO TTLOut channel name
     :param dds_reset_device: DDS reset RTIO TTLOut channel name
+    :param sync_device: AD9910 SYNC_IN RTIO TTLClockGen channel name
     :param refclk: Reference clock (SMA, MMCX or on-board 100 MHz oscillator)
         frequency in Hz
     :param clk_sel: Reference clock selection. For hardware revision >= 1.3
@@ -122,8 +123,8 @@ class CPLD:
         internal MMCX. For hardware revision <= v1.2 valid options are: 0 -
         either XO or MMCX dependent on component population; 1 SMA. Unsupported
         clocking options are silently ignored.
-    :param sync_sel: SYNC clock selection. 0 corresponds to SYNC clock over EEM
-        from FPGA. 1 corresponds to SYNC clock from DDS0.
+    :param sync_sel: SYNC_IN selection. 0 corresponds to SYNC_IN over EEM
+        from FPGA. 1 corresponds to SYNC_IN from DDS0.
     :param rf_sw: Initial CPLD RF switch register setting (default: 0x0).
         Knowledge of this state is not transferred between experiments.
     :param att: Initial attenuator setting shift register (default:
@@ -134,7 +135,8 @@ class CPLD:
     kernel_invariants = {"refclk", "bus", "core", "io_update"}
 
     def __init__(self, dmgr, spi_device, io_update_device=None,
-                 dds_reset_device=None, sync_sel=0, clk_sel=0, rf_sw=0,
+                 dds_reset_device=None, sync_device=None,
+                 sync_sel=0, clk_sel=0, rf_sw=0,
                  refclk=125e6, att=0x00000000, core_device="core"):
 
         self.core = dmgr.get(core_device)
@@ -147,6 +149,8 @@ class CPLD:
             self.io_update = _RegIOUpdate(self)
         if dds_reset_device is not None:
             self.dds_reset = dmgr.get(dds_reset_device)
+        if sync_device is not None:
+            self.sync = dmgr.get(sync_device)
 
         self.cfg_reg = urukul_cfg(rf_sw=rf_sw, led=0, profile=0,
                                   io_update=0, mask_nu=0, clk_sel=clk_sel,
@@ -289,3 +293,20 @@ class CPLD:
                                SPIT_ATT_RD, CS_ATT)
         self.bus.write(self.att_reg)
         return self.bus.read()
+
+    @kernel
+    def set_sync_div(self, div):
+        """Set the SYNC_IN AD9910 pulse generator frequency
+        and align it to the current RTIO timestamp.
+
+        The SYNC_IN signal is derived from the coarse RTIO clock
+        and the divider must be a power of two two.
+        Configure ``sync_sel == 0``.
+
+        :param div: SYNC_IN frequency divider. Must be a power of two.
+            Minimum division ratio is 2. Maximum division ratio is 16.
+        """
+        ftw_max = 1 << 4
+        ftw = ftw_max//div
+        assert ftw*div == ftw_max
+        self.sync.set_mu(ftw)

artiq/examples/kasli_basic/device_db_ptb.py

@@ -87,36 +87,42 @@ device_db.update({
         "class": "SPIMaster",
         "arguments": {"channel": 27}
     },
-    "ttl_urukul0_io_update": {
+    "ttl_urukul0_sync": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
-        "class": "TTLOut",
-        "arguments": {"channel": 28}
+        "class": "TTLClockGen",
+        "arguments": {"channel": 28, "acc_width": 4}
     },
-    "ttl_urukul0_sw0": {
+    "ttl_urukul0_io_update": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
         "arguments": {"channel": 29}
     },
-    "ttl_urukul0_sw1": {
+    "ttl_urukul0_sw0": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
         "arguments": {"channel": 30}
     },
-    "ttl_urukul0_sw2": {
+    "ttl_urukul0_sw1": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
         "arguments": {"channel": 31}
     },
-    "ttl_urukul0_sw3": {
+    "ttl_urukul0_sw2": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
         "arguments": {"channel": 32}
     },
+    "ttl_urukul0_sw3": {
+        "type": "local",
+        "module": "artiq.coredevice.ttl",
+        "class": "TTLOut",
+        "arguments": {"channel": 33}
+    },
     "urukul0_cpld": {
         "type": "local",
         "module": "artiq.coredevice.urukul",
@@ -124,6 +130,7 @@ device_db.update({
         "arguments": {
             "spi_device": "spi_urukul0",
             "io_update_device": "ttl_urukul0_io_update",
+            "sync_device": "ttl_urukul0_sync",
             "refclk": 100e6,
             "clk_sel": 0
         }
@@ -150,13 +157,19 @@ device_db.update({
         "type": "local",
         "module": "artiq.coredevice.spi2",
         "class": "SPIMaster",
-        "arguments": {"channel": 33}
+        "arguments": {"channel": 34}
+    },
+    "ttl_urukul1_sync": {
+        "type": "local",
+        "module": "artiq.coredevice.ttl",
+        "class": "TTLClockGen",
+        "arguments": {"channel": 35, "acc_width": 4}
     },
     "ttl_urukul1_io_update": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 34}
+        "arguments": {"channel": 36}
     },
     "urukul1_cpld": {
         "type": "local",
@@ -190,13 +203,13 @@ device_db.update({
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 35}
+        "arguments": {"channel": 37}
     },
     "led1": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 36}
+        "arguments": {"channel": 38}
     }
 })
 
@@ -206,19 +219,19 @@ device_db.update({
         "type": "local",
         "module": "artiq.coredevice.spi2",
         "class": "SPIMaster",
-        "arguments": {"channel": 37}
+        "arguments": {"channel": 39}
     },
     "ttl_zotino0_ldac": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 38}
+        "arguments": {"channel": 40}
     },
     "ttl_zotino0_clr": {
         "type": "local",
         "module": "artiq.coredevice.ttl",
         "class": "TTLOut",
-        "arguments": {"channel": 40}
+        "arguments": {"channel": 41}
     },
     "zotino0": {
         "type": "local",

artiq/gateware/eem.py

@@ -148,7 +148,8 @@ class Urukul(_EEM):
         return ios
 
     @classmethod
-    def add_std(cls, target, eem, eem_aux, ttl_out_cls, iostandard="LVDS_25"):
+    def add_std(cls, target, eem, eem_aux, ttl_out_cls, sync_gen_cls=None,
+                iostandard="LVDS_25"):
         cls.add_extension(target, eem, eem_aux, iostandard=iostandard)
 
         phy = spi2.SPIMaster(target.platform.request("urukul{}_spi_p".format(eem)),
@@ -157,7 +158,12 @@ class Urukul(_EEM):
         target.rtio_channels.append(rtio.Channel.from_phy(phy, ififo_depth=4))
 
         pads = target.platform.request("urukul{}_dds_reset".format(eem))
-        target.specials += DifferentialOutput(0, pads.p, pads.n)
+        pad = Signal(reset=0)
+        target.specials += DifferentialOutput(pad, pads.p, pads.n)
+        if sync_gen_cls is not None:  # AD9910 variant and SYNC_IN from EEM
+            phy = sync_gen_cls(pad, ftw_width=4)
+            target.submodules += phy
+            target.rtio_channels.append(rtio.Channel.from_phy(phy))
 
         pads = target.platform.request("urukul{}_io_update".format(eem))
         phy = ttl_out_cls(pads.p, pads.n)
@@ -170,7 +176,6 @@ class Urukul(_EEM):
                 target.submodules += phy
                 target.rtio_channels.append(rtio.Channel.from_phy(phy))
 
-
 class Sampler(_EEM):
     @staticmethod
     def io(eem, eem_aux, iostandard="LVDS_25"):

artiq/gateware/targets/kasli.py

@@ -516,8 +516,10 @@ class PTB(_StandaloneBase):
         eem.DIO.add_std(self, 2,
             ttl_serdes_7series.Output_8X, ttl_serdes_7series.Output_8X)
         eem.Sampler.add_std(self, 3, None, ttl_serdes_7series.Output_8X)
-        eem.Urukul.add_std(self, 5, 4, ttl_serdes_7series.Output_8X)
-        eem.Urukul.add_std(self, 6, None, ttl_serdes_7series.Output_8X)
+        eem.Urukul.add_std(self, 5, 4, ttl_serdes_7series.Output_8X,
+                ttl_simple.ClockGen)
+        eem.Urukul.add_std(self, 6, None, ttl_serdes_7series.Output_8X,
+                ttl_simple.ClockGen)
 
         for i in (1, 2):
             sfp_ctl = self.platform.request("sfp_ctl", i)