a code for SPI comunication slave and master, you can use for DSP or other driver.

spi_slave\tags\V100\doc\opb_spi_slave.pdf
.........\....\....\...\src\content\spec.tex
.........\....\....\...\...\.......\Titel.tex
.........\....\....\...\...\.......\Z-Anhang.tex
.........\....\....\...\...\Grafik\block_diagramm.eps
.........\....\....\...\...\......\block_diagramm.odg
.........\....\....\...\...\......\block_diagramm.pdf
.........\....\....\...\...\opb_spi_slave.tcp
.........\....\....\...\...\opb_spi_slave.tex
.........\....\....\pcore\opb_spi_slave_v1_00_a\data\opb_spi_slave_v2_1_0.mpd
.........\....\....\.....\.....................\....\opb_spi_slave_v2_1_0.pao
.........\....\....\.....\.....................\hdl\vhdl\bin2gray.vhd
.........\....\....\.....\.....................\...\....\fifo.vhd
.........\....\....\.....\.....................\...\....\fifo_prog_flags.vhd
.........\....\....\.....\.....................\...\....\gray2bin.vhd
.........\....\....\.....\.....................\...\....\gray_adder.vhd
.........\....\....\.....\.....................\...\....\irq_ctl.vhd
.........\....\....\.....\.....................\...\....\opb_if.vhd
.........\....\....\.....\.....................\...\....\opb_m_if.vhd
.........\....\....\.....\.....................\...\....\opb_spi_slave.vhd
.........\....\....\.....\.....................\...\....\opb_spi_slave_pack.vhd
.........\....\....\.....\.....................\...\....\ram.vhd
.........\....\....\.....\.....................\...\....\shift_register.vhd
.........\.runk\bench\vhdl\bin2gray_tb.vhd
.........\.....\.....\....\crc_core_tb.vhd
.........\.....\.....\....\fifo_tb.vhd
.........\.....\.....\....\images-body.vhd
.........\.....\.....\....\opb_if_tb.vhd
.........\.....\.....\....\opb_m_if_tb.vhd
.........\.....\.....\....\opb_spi_slave_tb.vhd
.........\.....\.....\....\rx_fifo_emu.vhd
.........\.....\.....\....\shift_register_tb.vhd
.........\.....\.....\....\txt_util.vhd
.........\.....\.....\....\tx_fifo_emu.vhd
.........\.....\doc\opb_spi_slave.pdf
.........\.....\...\src\content\spec.tex
.........\.....\...\...\.......\Titel.tex
.........\.....\...\...\.......\Z-Anhang.tex
.........\.....\...\...\Grafik\block_diagramm.eps
.........\.....\...\...\......\block_diagramm.odg
.........\.....\...\...\......\block_diagramm.pdf
.........\.....\...\...\opb_spi_slave.h
.........\.....\...\...\opb_spi_slave.tcp
.........\.....\...\...\opb_spi_slave.tex
.........\.....\...\vhdldoc_2007-11-22.zip
.........\.....\pcore\opb_spi_slave_v1_00_a\data\opb_spi_slave_v2_1_0.mpd
.........\.....\.....\.....................\....\opb_spi_slave_v2_1_0.pao
.........\.....\.....\.....................\....\opb_spi_slave_v2_1_0.ucf
.........\.....\.....\.....................\hdl\vhdl\bin2gray.vhd
.........\.....\.....\.....................\...\....\crc_core.vhd
.........\.....\.....\.....................\...\....\crc_gen.vhd
.........\.....\.....\.....................\...\....\fifo.vhd
.........\.....\.....\.....................\...\....\fifo_prog_flags.vhd
.........\.....\.....\.....................\...\....\gray2bin.vhd
.........\.....\.....\.....................\...\....\gray_adder.vhd
.........\.....\.....\.....................\...\....\irq_ctl.vhd
.........\.....\.....\.....................\...\....\opb_if.vhd
.........\.....\.....\.....................\...\....\opb_m_if.vhd
.........\.....\.....\.....................\...\....\opb_spi_slave.vhd
.........\.....\.....\.....................\...\....\opb_spi_slave_pack.vhd
.........\.....\.....\.....................\...\....\PCK_CRC32_D32.vhd
.........\.....\.....\.....................\...\....\PCK_CRC8_D8.vhd
.........\.....\.....\.....................\...\....\ram.vhd
.........\.....\.....\.....................\...\....\shift_register.vhd
.........\.....\sim\rtl_sim\modelsim_sim\run\crc_core\crc_core_tb_c.do
.........\.....\...\.......\............\...\........\crc_core_tb_s.do
.........\.....\...\.......\............\...\........\crc_core_tb_w.do
.........\.....\...\.......\............\...\fifo\fifo_tb_c.do
.........\.....\...\.......\............\...\....\fifo_tb_s.do
.........\.....\...\.......\............\...\.

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