详细说明：FPGA读写SDRAM的实例，可以当作IPcore来添加，非常有价值的的程序。

文件列表:
  vga_system
  ..........\altpll0.bsf
  ..........\altpll0.ppf
  ..........\altpll0.v
  ..........\altpll0_bb.v
  ..........\altpll0_wave0.jpg
  ..........\altpll0_waveforms.html
  ..........\burst_0.v
  ..........\cpu.v
  ..........\cpu_bht_ram.mif
  ..........\cpu_dc_tag_ram.mif
  ..........\cpu_ic_tag_ram.mif
  ..........\cpu_jtag_debug_module.v
  ..........\cpu_jtag_debug_module_wrapper.v
  ..........\cpu_mult_cell.v
  ..........\cpu_ociram_default_contents.mif
  ..........\cpu_rf_ram_a.mif
  ..........\cpu_rf_ram_b.mif
  ..........\cpu_test_bench.v
  ..........\db
  ..........\..\altsyncram_9tl1.tdf
  ..........\..\altsyncram_abn1.tdf
  ..........\..\altsyncram_b4e1.tdf
  ..........\..\altsyncram_chp1.tdf
  ..........\..\altsyncram_cub1.tdf
  ..........\..\altsyncram_e502.tdf
  ..........\..\altsyncram_ji01.tdf
  ..........\..\altsyncram_k1l1.tdf
  ..........\..\altsyncram_l6e1.tdf
  ..........\..\altsyncram_lde1.tdf
  ..........\..\altsyncram_m6e1.tdf
  ..........\..\altsyncram_mge1.tdf
  ..........\..\altsyncram_reb1.tdf
  ..........\..\altsyncram_t072.tdf
  ..........\..\altsyncram_uce1.tdf
  ..........\..\altsyncram_veb1.tdf
  ..........\..\alt_synch_pipe_0e8.tdf
  ..........\..\alt_synch_pipe_1e8.tdf
  ..........\..\a_dpfifo_8t21.tdf
  ..........\..\a_fefifo_7cf.tdf
  ..........\..\a_gray2bin_ldb.tdf
  ..........\..\a_graycounter_fgc.tdf
  ..........\..\a_graycounter_ggc.tdf
  ..........\..\a_graycounter_p96.tdf
  ..........\..\cntr_fjb.tdf
  ..........\..\cntr_rj7.tdf
  ..........\..\dcfifo_min1.tdf
  ..........\..\decode_aoi.tdf
  ..........\..\ded_mult_2o81.tdf
  ..........\..\dffpipe_93c.tdf
  ..........\..\dffpipe_mcc.tdf
  ..........\..\dffpipe_pe9.tdf
  ..........\..\dffpipe_qe9.tdf
  ..........\..\dffpipe_re9.tdf
  ..........\..\dpram_5h21.tdf
  ..........\..\mult_add_4cr2.tdf
  ..........\..\mult_add_6cr2.tdf
  ..........\..\mux_1u7.tdf
  ..........\..\prev_cmp_vga_system.fit.qmsg
  ..........\..\prev_cmp_vga_system.map.qmsg
  ..........\..\prev_cmp_vga_system.qmsg
  ..........\..\scfifo_5n21.tdf
  ..........\..\vga_system.asm.qmsg
  ..........\..\vga_system.asm_labs.ddb
  ..........\..\vga_system.cbx.xml
  ..........\..\vga_system.cmp.bpm
  ..........\..\vga_system.cmp.cdb
  ..........\..\vga_system.cmp.hdb
  ..........\..\vga_system.cmp.logdb
  ..........\..\vga_system.cmp.rdb
  ..........\..\vga_system.cmp.tdb
  ..........\..\vga_system.cmp0.ddb
  ..........\..\vga_system.cmp2.ddb
  ..........\..\vga_system.cmp_bb.cdb
  ..........\..\vga_system.cmp_bb.hdb
  ..........\..\vga_system.cmp_bb.logdb
  ..........\..\vga_system.cmp_bb.rcf
  ..........\..\vga_system.fit.qmsg
  ..........\..\vga_system.hier_info
  ..........\..\vga_system.hif
  ..........\..\vga_system.map.bpm
  ..........\..\vga_system.map.cdb
  ..........\..\vga_system.map.hdb
  ..........\..\vga_system.map.logdb
  ..........\..\vga_system.map.qmsg
  ..........\..\vga_system.map_bb.cdb
  ..........\..\vga_system.map_bb.hdb
  ..........\..\vga_system.map_bb.logdb
  ..........\..\vga_system.merge_hb.atm
  ..........\..\vga_system.pre_map.cdb
  ..........\..\vga_system.pre_map.hdb
  ..........\..\vga_system.pss
  ..........\..\vga_system.rtlv.hdb
  ..........\..\vga_system.rtlv_sg.cdb
  ..........\..\vga_system.rtlv_sg_swap.cdb
  ..........\..\vga_system.sgdiff.cdb
  ..........\..\vga_system.sgdiff.hdb
  ... ...