Simple I2C controller
-- 1) No multimaster
-- 2) No slave mode
-- 3) No fifo s
--
-- notes:
-- Every command is acknowledged. Do not set a new command before previous is acknowledged.
-- Dout is available 1 clock cycle later as cmd_ack
-- 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
