diff --git a/artiq/gateware/rtio/sed/fifo.py b/artiq/gateware/rtio/sed/fifos.py
similarity index 66%
rename from artiq/gateware/rtio/sed/fifo.py
rename to artiq/gateware/rtio/sed/fifos.py
index 1f908a0c1..da0f4fcfe 100644
--- a/artiq/gateware/rtio/sed/fifo.py
+++ b/artiq/gateware/rtio/sed/fifos.py
@@ -4,21 +4,21 @@ from migen.genlib.fifo import *
 from artiq.gateware.rtio.sed import layouts
 
 
-__all__ = ["FIFO"]
+__all__ = ["FIFOs"]
 
 
-class FIFO(Module):
-    def __init__(self, lane_count, mode, fifo_depth, layout_payload):
-        seqn_width = layouts.seqn_width(lane_count, fifo_width)
-        self.input = [layouts.fifo_ingress(seqn_width, layout_payload)
+class FIFOs(Module):
+    def __init__(self, lane_count, fifo_depth, layout_payload, mode):
+        seqn_width = layouts.seqn_width(lane_count, fifo_depth)
+        self.input = [Record(layouts.fifo_ingress(seqn_width, layout_payload))
                       for _ in range(lane_count)]
-        self.output = [layouts.fifo_egress(seqn_width, layout_payload)
+        self.output = [Record(layouts.fifo_egress(seqn_width, layout_payload))
                        for _ in range(lane_count)]
 
         if mode == "sync":
-            fifo_cls = fifo.SyncFIFOBuffered
+            fifo_cls = SyncFIFOBuffered
         elif mode == "async":
-            fifo_cls = fifo.AsyncFIFO
+            fifo_cls = AsyncFIFO
         else:
             raise ValueError
 
diff --git a/artiq/gateware/rtio/sed/tsc_gate.py b/artiq/gateware/rtio/sed/gates.py
similarity index 83%
rename from artiq/gateware/rtio/sed/tsc_gate.py
rename to artiq/gateware/rtio/sed/gates.py
index 4114a8f3c..3475c71a1 100644
--- a/artiq/gateware/rtio/sed/tsc_gate.py
+++ b/artiq/gateware/rtio/sed/gates.py
@@ -3,10 +3,10 @@ from migen import *
 from artiq.gateware.rtio.sed import layouts
 
 
-__all__ = ["TSCGate"]
+__all__ = ["Gates"]
 
 
-class TSCGate(Module):
+class Gates(Module):
     def __init__(self, lane_count, seqn_width, layout_fifo_payload, layout_output_network_payload):
         self.input = [Record(layouts.fifo_egress(seqn_width, layout_fifo_payload))
                       for _ in range(lane_count)]
@@ -17,12 +17,11 @@ class TSCGate(Module):
             fine_ts_width = len(self.output[0].fine_ts)
         else:
             fine_ts_width = 0
-        self.tsc = Signal(64-fine_ts_width)
+
+        self.coarse_timestamp = Signal(64-fine_ts_width)
 
         # # #
 
-        self.sync += self.tsc.eq(self.tsc + 1)
-
         for input, output in zip(self.input, self.output):
             for field, _ in output.payload.layout:
                 if field == "fine_ts":
@@ -32,6 +31,5 @@ class TSCGate(Module):
             self.sync += output.seqn.eq(input.seqn)
             self.comb += output.replace_occured.eq(0)
 
-            self.comb += input.re.eq(input.payload.timestamp[fine_ts_width:] == self.tsc)
-            self.sync += ouput.valid.eq(input.re & input.readable)
-
+            self.comb += input.re.eq(input.payload.timestamp[fine_ts_width:] == self.coarse_timestamp)
+            self.sync += output.valid.eq(input.re & input.readable)