[Cryptech-Commits] [core/platform/novena] 01/05: Move eim read delay to novena_eim.v.

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paul at psgd.org pushed a commit to branch master
in repository core/platform/novena.

commit 2f58e8fc6cffd28afbdb31f489cd8ce061cccad4
Author: Paul Selkirk <paul at psgd.org>
Date:   Tue Mar 31 16:33:43 2015 -0400

    Move eim read delay to novena_eim.v.
---
 eim/rtl/novena_eim.v | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/eim/rtl/novena_eim.v b/eim/rtl/novena_eim.v
index d2b11ed..71b64a9 100644
--- a/eim/rtl/novena_eim.v
+++ b/eim/rtl/novena_eim.v
@@ -141,6 +141,16 @@ module novena_top
    // This multiplexer is used to map different types of cores, such as
    // hashes, RNGs and ciphers to different regions (segments) of memory.
    //----------------------------------------------------------------
+
+   // register read data for one clock cycle for EIM
+   wire [31 : 0]        tmp_read_data;
+   reg [31 : 0]         tmp_read_data_reg;
+   assign sys_eim_din = tmp_read_data_reg;
+   always @(posedge sys_clk)
+     begin
+        tmp_read_data_reg <= tmp_read_data;
+     end
+
    core_selector cores
      (
       .sys_clk(sys_clk),
@@ -153,7 +163,7 @@ module novena_top
       .sys_eim_rd(sys_eim_rd),
 
       .sys_write_data(sys_eim_dout),
-      .sys_read_data(sys_eim_din),
+      .sys_read_data(tmp_read_data),
 
       .debug(ct_led)
       );