From 72cdd846b0d0c1bafbeb98c14f919dee99cb855a Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Mon, 17 Apr 2017 13:12:06 +0200
Subject: [PATCH] axi_ad9963: Allow to disable the IDELAYs on the ADC data path

Not all designs need the IDELAYs. Disabling them can reduce power consumption of the system.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
 library/axi_ad9963/axi_ad9963.v    |  7 +++++--
 library/axi_ad9963/axi_ad9963_if.v |  3 +++
 library/axi_ad9963/axi_ad9963_rx.v | 13 +++++++++++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/library/axi_ad9963/axi_ad9963.v b/library/axi_ad9963/axi_ad9963.v
index 0e1768de8..cfc487a61 100644
--- a/library/axi_ad9963/axi_ad9963.v
+++ b/library/axi_ad9963/axi_ad9963.v
@@ -43,6 +43,7 @@ module axi_ad9963 #(
 
   parameter   ID = 0,
   parameter   DEVICE_TYPE = 0,
+  parameter   ADC_IODELAY_ENABLE = 0,
   parameter   DAC_IODELAY_ENABLE = 0,
   parameter   IO_DELAY_GROUP = "dev_if_delay_group",
   parameter   DAC_DATAPATH_DISABLE = 0,
@@ -176,6 +177,7 @@ module axi_ad9963 #(
 
   axi_ad9963_if #(
     .DEVICE_TYPE (DEVICE_TYPE),
+    .ADC_IODELAY_ENABLE (ADC_IODELAY_ENABLE),
     .DAC_IODELAY_ENABLE (DAC_IODELAY_ENABLE),
     .IO_DELAY_GROUP (IO_DELAY_GROUP))
   i_dev_if (
@@ -206,8 +208,9 @@ module axi_ad9963 #(
 
   axi_ad9963_rx #(
     .ID (ID),
-    .DATAPATH_DISABLE (ADC_DATAPATH_DISABLE))
-  i_rx (
+    .DATAPATH_DISABLE (ADC_DATAPATH_DISABLE),
+    .IODELAY_ENABLE (ADC_IODELAY_ENABLE)
+  ) i_rx (
     .adc_rst (adc_rst),
     .adc_clk (adc_clk),
     .adc_valid (adc_valid_s),
diff --git a/library/axi_ad9963/axi_ad9963_if.v b/library/axi_ad9963/axi_ad9963_if.v
index 3c8682818..574baeae0 100644
--- a/library/axi_ad9963/axi_ad9963_if.v
+++ b/library/axi_ad9963/axi_ad9963_if.v
@@ -36,6 +36,7 @@ module axi_ad9963_if #(
 
   parameter   DEVICE_TYPE = 0,
   parameter   DAC_IODELAY_ENABLE = 0,
+  parameter   ADC_IODELAY_ENABLE = 0,
   parameter   IO_DELAY_GROUP = "dev_if_delay_group") (
 
   // physical interface (receive)
@@ -135,6 +136,7 @@ module axi_ad9963_if #(
   ad_lvds_in #(
     .SINGLE_ENDED (1),
     .DEVICE_TYPE (DEVICE_TYPE),
+    .IODELAY_ENABLE (ADC_IODELAY_ENABLE),
     .IODELAY_CTRL (0),
     .IODELAY_GROUP (IO_DELAY_GROUP))
   i_rx_data (
@@ -158,6 +160,7 @@ module axi_ad9963_if #(
   ad_lvds_in #(
     .SINGLE_ENDED (1),
     .DEVICE_TYPE (DEVICE_TYPE),
+    .IODELAY_ENABLE (ADC_IODELAY_ENABLE),
     .IODELAY_CTRL (1),
     .IODELAY_GROUP (IO_DELAY_GROUP))
   i_rx_iq (
diff --git a/library/axi_ad9963/axi_ad9963_rx.v b/library/axi_ad9963/axi_ad9963_rx.v
index bae599200..84bec6e69 100644
--- a/library/axi_ad9963/axi_ad9963_rx.v
+++ b/library/axi_ad9963/axi_ad9963_rx.v
@@ -42,6 +42,7 @@ module axi_ad9963_rx #(
   // parameters
 
   parameter   DATAPATH_DISABLE = 0,
+  parameter   IODELAY_ENABLE = 0,
   parameter   ID = 0) (
 
   // adc interface
@@ -233,6 +234,8 @@ module axi_ad9963_rx #(
 
   // adc delay control
 
+  generate if (IODELAY_ENABLE == 1) begin
+
   up_delay_cntrl #(.DATA_WIDTH(13), .BASE_ADDRESS(6'h02)) i_delay_cntrl (
     .delay_clk (delay_clk),
     .delay_rst (delay_rst),
@@ -251,6 +254,16 @@ module axi_ad9963_rx #(
     .up_rdata (up_rdata_s[3]),
     .up_rack (up_rack_s[3]));
 
+  end else begin
+    assign up_dld = 'h00;
+    assign up_dwdata = 'h00;
+    assign delay_rst = 1'b1;
+    assign up_wack_s[3] = 0;
+    assign up_rack_s[3] = 0;
+    assign up_rdata_s[3] = 'h00;
+  end
+  endgenerate
+
 endmodule
 
 // ***************************************************************************