Opencore site from the I2C bus module, you can use a proven

i2c总线
.......\chinesi2c.pdf
.......\i2c-IPcore
.......\..........\i2c
.......\..........\...\bench
.......\..........\...\.....\verilog
.......\..........\...\.....\.......\CVS
.......\..........\...\.....\.......\...\Entries
.......\..........\...\.....\.......\...\Repository
.......\..........\...\.....\.......\...\Root
.......\..........\...\.....\.......\i2c_slave_model.v
.......\..........\...\.....\.......\spi_slave_model.v
.......\..........\...\.....\.......\tst_bench_top.v
.......\..........\...\.....\.......\wb_master_model.v
.......\..........\...\doc
.......\..........\...\...\i2c_specs.pdf
.......\..........\...\...\src
.......\..........\...\...\...\I2C_specs.doc
.......\..........\...\rtl
.......\..........\...\...\verilog
.......\..........\...\...\.......\i2c
.......\..........\...\...\.......\...\i2c.ise
.......\..........\...\...\.......\...\i2c.ise_ISE_Backup
.......\..........\...\...\.......\...\i2c.restore
.......\..........\...\...\.......\...\i2c_ise9migration.zip
.......\..........\...\...\.......\...\i2c_master_bit_ctrl_summary.html
.......\..........\...\...\.......\...\i2c_master_byte_ctrl_summary.html
.......\..........\...\...\.......\...\i2c_master_top_summary.html
.......\..........\...\...\.......\...\templates
.......\..........\...\...\.......\...\_xmsgs
.......\..........\...\...\.......\i2c_master_bit_ctrl.v
.......\..........\...\...\.......\i2c_master_byte_ctrl.v
.......\..........\...\...\.......\i2c_master_defines.v
.......\..........\...\...\.......\i2c_master_top.v
.......\..........\...\...\.......\timescale.v
.......\..........\...\...\vhdl
.......\..........\...\...\....\I2C.VHD
.......\..........\...\...\....\i2c_master_bit_ctrl.vhd
.......\..........\...\...\....\i2c_master_byte_ctrl.vhd
.......\..........\...\...\....\i2c_master_top.vhd
.......\..........\...\...\....\readme
.......\..........\...\...\....\tst_ds1621.vhd
.......\..........\...\software
.......\..........\...\........\include
.......\..........\...\........\.......\oc_i2c_master.h

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