3 APB asynchronous bridge

The css600_apbasyncbridge is used where an AMBA APB4 bus is required to cross a clock or power domain boundary.

The APB asynchronous bridge provides the following features:

  • Two independent clock domains with any phase or frequency alignment.
  • Two independent power domains, either of which can be switched relative to the other.
  • Three Q-Channel LPIs for slave side clock, master side clock, and power switching management.
  • A two-part meta-component with separate slave and master side components.
  • Configurable APB address width.
  • Configurable 2- or 3-deep synchronizers.

The following figure shows the external connections on the APB asynchronous bridge.

Figure 3-4 css600_apbasyncbridge logical connections
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