diff --git a/dataflow_neuro/chips_noread.act b/dataflow_neuro/chips_noread.act
index eb32197..e8c2762 100644
--- a/dataflow_neuro/chips_noread.act
+++ b/dataflow_neuro/chips_noread.act
@@ -94,7 +94,8 @@ defproc texel_core (avMx1of2<N_IN> in, out;
     demux_bit_msb<N_IN-1> _demux(.in = fifo_in.out, .reset_B = _reset_BX, .supply = supply);
 
     // Register
-    fifo<N_IN-1,N_BUFFERS> fifo_dmx2reg(.in = _demux.out2, .reset_B = _reset_BX, .supply = supply);
+    slice_data<N_IN-1, 0,REG_NCW+REG_NCA> slice_pre_reg(.in = _demux.out2, .supply = supply);
+    fifo<REG_NCW+REG_NCA,N_BUFFERS> fifo_dmx2reg(.in = slice_pre_reg.out, .reset_B = _reset_BX, .supply = supply);
     register_w_array<REG_NCA, REG_NCW, REG_M> register(.in = fifo_dmx2reg.out, .data = reg_data,
         .supply = supply, .reset_B = reset_reg_B);
 
diff --git a/dataflow_neuro/primitives.act b/dataflow_neuro/primitives.act
index 541c9d5..9ab2d10 100644
--- a/dataflow_neuro/primitives.act
+++ b/dataflow_neuro/primitives.act
@@ -841,17 +841,22 @@ defproc slice_data(avMx1of2<N> in; avMx1of2<std::min(N1,N)-std::max(N0,0)> out;
     _N1 = std::min(N1,N);
     _N0 = std::max(N0,0);
 
+    [_N0 = 0 & _N1 = N ->
+      in = out;
+    [] _N0 != 0 | _N1 != N ->
 
-    // BUF_X1 ack_buf(.a = out.a, .y = in.a, .vss = supply.vss, .vdd = supply.vdd);
+      vtree<N> in_vt(.in = in.d, .out = in.v, .supply = supply);
+      (i:_N1-_N0:
+          in.d.d[i + _N0] = out.d.d[i];
+      )
 
-    vtree<N> in_vt(.in = in.d, .out = in.v, .supply = supply);
-    (i:_N1-_N0:
-        in.d.d[i + _N0] = out.d.d[i];
-    )
+      // in.a = out.a;
+
+      A_2C_B_X1 Cel(.c1 = out.a, .c2 =in.v, .y = in.a, .vss = supply.vss, .vdd = supply.vdd);
+
+    ]
 
-    // in.a = out.a;
 
-    A_2C_B_X1 Cel(.c1 = out.a, .c2 =in.v, .y = in.a, .vss = supply.vss, .vdd = supply.vdd);
 
 }
 
diff --git a/test/unit_tests/texel_dualcore_glue_noread/test.act b/test/unit_tests/texel_dualcore_glue_noread/test.act
index 770236e..704110f 100644
--- a/test/unit_tests/texel_dualcore_glue_noread/test.act
+++ b/test/unit_tests/texel_dualcore_glue_noread/test.act
@@ -75,7 +75,7 @@ pint N_LINE_PD_DLY = 2;
 
 pint REG_NCA = 6;
 pint REG_M = 1<<REG_NCA;
-pint REG_NCW = 24;
+pint REG_NCW = 23;
 
 
 defproc texel_dualcore_glue_noread (bd<N_IN> in, out;
diff --git a/test/unit_tests/texel_dualcore_glue_noread/test.prsim b/test/unit_tests/texel_dualcore_glue_noread/test.prsim
index fa7ebbc..37bc3d1 100644
--- a/test/unit_tests/texel_dualcore_glue_noread/test.prsim
+++ b/test/unit_tests/texel_dualcore_glue_noread/test.prsim
@@ -50,8 +50,6 @@ watch c.c1_reg_data[0].d[21].t
 watch c.c1_reg_data[0].d[21].f
 watch c.c1_reg_data[0].d[22].t
 watch c.c1_reg_data[0].d[22].f
-watch c.c1_reg_data[0].d[23].t
-watch c.c1_reg_data[0].d[23].f
 
 
 set c.bd_dly_cfg[0] 1