diff --git a/lib/SDRAM/ddr_sdr_v1_5/doc/SDRAM_CTRL.vsd b/lib/SDRAM/ddr_sdr_v1_5/doc/SDRAM_CTRL.vsd new file mode 100644 index 0000000..31469d5 Binary files /dev/null and b/lib/SDRAM/ddr_sdr_v1_5/doc/SDRAM_CTRL.vsd differ