Previous commit was data loss when writing to the DDR in burst smaller than…

Previous commit was data loss when writing to the DDR in burst smaller than c_DDR_BURST_LENGTH. Use wb_stb falling edge only on read cycles, use wb_we falling edge for write cycles. git-svn-id: http://svn.ohwr.org/ddr3-sp6-core/trunk@85 739e5516-d4a2-47df-ba96-5610c1fa693f

Previous commit was data loss when writing to the DDR in burst smaller than…
Previous commit was data loss when writing to the DDR in burst smaller than c_DDR_BURST_LENGTH. Use wb_stb falling edge only on read cycles, use wb_we falling edge for write cycles. git-svn-id: http://svn.ohwr.org/ddr3-sp6-core/trunk@85 739e5516-d4a2-47df-ba96-5610c1fa693f
221d1e40 · mcattin · 23cb58c1 · 221d1e40
Commit 221d1e40 authored Dec 09, 2011 by mcattin
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ddr3_ctrl_wb.vhd hdl/rtl/ddr3_ctrl_wb.vhd +2 -1

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--- a/hdl/rtl/ddr3_ctrl_wb.vhd
+++ b/hdl/rtl/ddr3_ctrl_wb.vhd
@@ -248,7 +248,8 @@ begin
      else
        ddr_cmd_en_d <= ddr_cmd_en;
        if (((ddr_burst_cnt = c_DDR_BURST_LENGTH) or
-             (wb_stb_f_edge = '1')) and ddr_cmd_full_i = '0') and (ddr_cmd_en = '0')then
+             (wb_we_f_edge = '1') or
+             (wb_stb_f_edge = '1' and wb_we_d = '1')) and ddr_cmd_full_i = '0') and (ddr_cmd_en = '0')then
          ddr_cmd_en <= '1';            -- might have problem if burst_cnt = BURST_LENGTH for more than 2 clk cycles
        else
          ddr_cmd_en <= '0';