Abstract: An integrated circuit 2 is provided with multiple clock domains separated by a clock boundary 8. Data values are passed across the clock boundary 8 using a first-in-first-out memory (FIFO), a read pointer and a write pointer for the FIFO are passed across the clock boundary 8 and must be synchronized to the receiving clock frequency. The clocks being used on either side of the clock boundary 8 may be switched and have a variable relationship therebetween. Multiple synchronization paths are provided within pointer synchronizing circuitry 32 which are used depending upon the particular relationship between the clocks on either side of the clock boundary 8. A pre-switch pointer value is held in a transition register 44 until a post-switch pointer value is available from the new synchronizing path 36 when a switch in clock mode is made which requires an increase in synchronization delay.

Abstract: An integrated circuit 2 is provided with multiple clock domains separated by a clock boundary 8. Data values are passed across the clock boundary 8 using a first-in-first-out memory (FIFO), a read pointer and a write pointer for the FIFO are passed across the clock boundary 8 and must be synchronised to the receiving clock frequency. The clocks being used on either side of the clock boundary 8 may be switched and have a variable relationship therebetween. Multiple synchronisation paths are provided within pointer synchronising circuitry 32 which are used depending upon the particular relationship between the clocks on either side of the clock boundary 8. A pre-switch pointer value is held in a transition register 44 until a post-switch pointer value is available from the new synchronising path 36 when a switch in clock mode is made which requires an increase in synchronisation delay.

Abstract: A process for dyeing keratinous fibers such as hair which comprises reacting the hair with a dyestuff of the general formula ##EQU1## where X is a chromophoric group, such as a group formed by coupling a phenylene diazonium salt with a diazo coupling compound, and where R has the formula --R'COOH, --R'COOCH.sub.3, --CH.sub.2 CH.sub.2 OH or --CH.sub.3 in which R' is an alkylene group containing 1,2 or 3 carbon atoms. The process gives good coloring of hair without damaging the condition.The invention also relates to novel dyes for use in the process and to processes for their production, and to dyeing compositions containing the dyes.