IP Solutions for Synchronizing Signals that Cross Clock Domains

This paper explains the many types of synchronization issues that occur when clocks and data signals cross from one clock domain to another. In all cases, the issues covered here involve clock domains that are asynchronous with respect to one another. Along with each issue, one or more DesignWare solutions is outlined. The topics and solutions include:

• Basic synchronization—DW_sync
• Temporal event synchronization—DW_pulse_sync, DW_pulseack_sync
• Simple data transfer synchronization—DW_data_sync, DW_data_sync_na, DW_data_sync_1c
• Data flow synchronization—DW_fifo_s2_sf, DW_fifo_2c_df, DW_stream_sync
• Reset sequencing—DW_reset_sync
• Related clock system data synchronization—DW_data_qsync_hl, DW_data_qsync_lh