Change Write Enable for DAC-SPI Interface

diff --git a/mupix/sources/spi_if.vhd b/mupix/sources/spi_if.vhd
index 537322fe8042ecc7de4f1a6c2ab1913d6317d866..36d1ba1e3eef27fd85f722b5a5b3efdcce470d63 100644 (file)
--- a/mupix/sources/spi_if.vhd
+++ b/mupix/sources/spi_if.vhd
@@ -4,7 +4,7 @@
 --
 -- Niklaus Berger, Heidelberg University
 -- nberger@physi.uni-heidelberg.de
---Changed to TRB3 readout by T. Weber, University Mainz
+-- Changed to TRB3 readout by T. Weber, University Mainz
 -----------------------------------------------------------------------------
 
 library ieee;
@@ -126,8 +126,7 @@ begin
   --TRB slave bus
   --x0040: Threshold-DAC Register 16 bits
   --x0041: Injection-DACs Register 32 bits
-  --x0042: WriteControl Register bit0: Write DACs
-  -----------------------------------------------------------------------------
+   -----------------------------------------------------------------------------
   SLV_HANDLER : process(clk)
   begin  -- process SLV_HANDLER
     if rising_edge(clk) then
@@ -135,18 +134,18 @@ begin
       SLV_UNKNOWN_ADDR_OUT <= '0';
       SLV_NO_MORE_DATA_OUT <= '0';
       SLV_ACK_OUT          <= '0';
+      wren <= '0';
 
       if SLV_READ_IN = '1' then
         case SLV_ADDR_IN is
           when x"0040" =>
             SLV_DATA_OUT <= x"0000" & threshold_reg;
             SLV_ACK_OUT  <= '1';
+            wren <= '1';
           when x"0041" =>
             SLV_DATA_OUT <= injection2_reg & injection1_reg;
             SLV_ACK_OUT  <= '1';
-          when x"0042" =>
-            SLV_DATA_OUT(0) <= wren;
-            SLV_ACK_OUT     <= '1';
+            wren <= '1';
           when others =>
             SLV_UNKNOWN_ADDR_OUT <= '1';
         end case;
@@ -161,9 +160,6 @@ begin
             injection2_reg <= SLV_DATA_IN(31 downto 16);
             injection1_reg <= SLV_DATA_IN(15 downto 0);
             SLV_ACK_OUT    <= '1';
-          when x"0042" =>
-            wren        <= SLV_DATA_IN(0);
-            SLV_ACK_OUT <= '1';
           when others =>
             SLV_UNKNOWN_ADDR_OUT <= '1';
         end case;