diff --git a/library/axi_ad9963/axi_ad9963.v b/library/axi_ad9963/axi_ad9963.v
index 1bed35e21..a2591db3a 100644
--- a/library/axi_ad9963/axi_ad9963.v
+++ b/library/axi_ad9963/axi_ad9963.v
@@ -168,16 +168,10 @@ module axi_ad9963 #(
 
   // processor read interface
 
-  always @(negedge up_rstn or posedge up_clk) begin
-    if (up_rstn == 0) begin
-      up_wack <= 'd0;
-      up_rack <= 'd0;
-      up_rdata <= 'd0;
-    end else begin
-      up_wack <= up_wack_rx_s | up_wack_tx_s ;
-      up_rack <= up_rack_rx_s | up_rack_tx_s ;
-      up_rdata <= up_rdata_rx_s | up_rdata_tx_s ;
-    end
+  always @(*) begin
+    up_wack <= up_wack_rx_s | up_wack_tx_s;
+    up_rack <= up_rack_rx_s | up_rack_tx_s;
+    up_rdata <= up_rdata_rx_s | up_rdata_tx_s;
   end
 
   // device interface
diff --git a/library/axi_ad9963/axi_ad9963_rx.v b/library/axi_ad9963/axi_ad9963_rx.v
index 27bac1229..bae599200 100644
--- a/library/axi_ad9963/axi_ad9963_rx.v
+++ b/library/axi_ad9963/axi_ad9963_rx.v
@@ -109,19 +109,19 @@ module axi_ad9963_rx #(
       up_status_pn_err <= 'd0;
       up_status_pn_oos <= 'd0;
       up_status_or <= 'd0;
-      up_rdata <= 'd0;
-      up_rack <= 'd0;
-      up_wack <= 'd0;
     end else begin
       up_status_pn_err <= | up_adc_pn_err_s;
       up_status_pn_oos <= | up_adc_pn_oos_s;
       up_status_or <= | up_adc_or_s;
-      up_rdata  <= up_rdata_s[0] | up_rdata_s[1] | up_rdata_s[2] | up_rdata_s[3];
-      up_rack   <= up_rack_s[0]  | up_rack_s[1]  | up_rack_s[2]  | up_rack_s[3];
-      up_wack   <= up_wack_s[0]  | up_wack_s[1]  | up_wack_s[2]  | up_wack_s[3];
     end
   end
 
+  always @(*) begin
+    up_rdata <= up_rdata_s[0] | up_rdata_s[1] | up_rdata_s[2] | up_rdata_s[3];
+    up_rack <= up_rack_s[0] | up_rack_s[1] | up_rack_s[2] | up_rack_s[3];
+    up_wack <= up_wack_s[0] | up_wack_s[1] | up_wack_s[2] | up_wack_s[3];
+  end
+
   // channel 0 (i)
 
   axi_ad9963_rx_channel #(
diff --git a/library/axi_ad9963/axi_ad9963_tx.v b/library/axi_ad9963/axi_ad9963_tx.v
index ee5dc4507..5aecaad45 100644
--- a/library/axi_ad9963/axi_ad9963_tx.v
+++ b/library/axi_ad9963/axi_ad9963_tx.v
@@ -136,16 +136,10 @@ module axi_ad9963_tx #(
 
   // processor read interface
 
-  always @(negedge up_rstn or posedge up_clk) begin
-    if (up_rstn == 0) begin
-      up_rdata <= 'd0;
-      up_rack <= 'd0;
-      up_wack <= 'd0;
-    end else begin
-      up_rdata <= up_rdata_s[0] | up_rdata_s[1] | up_rdata_s[2] | up_rdata_s[3];
-      up_rack <=  up_rack_s[0]  | up_rack_s[1]  | up_rack_s[2]  | up_rack_s[3];
-      up_wack <=  up_wack_s[0]  | up_wack_s[1]  | up_wack_s[2]  | up_wack_s[3];
-    end
+  always @(*) begin
+    up_rdata <= up_rdata_s[0] | up_rdata_s[1] | up_rdata_s[2] | up_rdata_s[3];
+    up_rack <=  up_rack_s[0] | up_rack_s[1] | up_rack_s[2] | up_rack_s[3];
+    up_wack <=  up_wack_s[0] | up_wack_s[1] | up_wack_s[2] | up_wack_s[3];
   end
 
   // dac channel