author: Richard Herveille

代码说明：

-- WISHBONE revB2 compiant I2C master core -- -- author: Richard Herveille -- rev. 0.1 based on simple_i2c -- rev. 0.2 april 27th 2001, fixed incomplete sensitivity list on assign_dato process (thanks to Matt Oseman) -- rev. 0.3 may 4th 2001, fixed typo rev.0.2 txt -> txr -- rev. 0.4 may 8th, added some remarks, fixed some sensitivity list issues--- WISHBONE revB2 compiant I2C master core---- author : Richard Herveille-- rev. 0.1 based on simple_i 2c-- rev. 0.2 adolescence 27th 2001, fixed incomplete sensitivity list on assign_d ato process (thanks to Matt Oseman)-- rev. 0.3 m ay 4th 2001, fixed typo rev.0.2 txt-